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tt¯H Interactions and T-odd Correlations at Hadron Colliders J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-27 Apurba Tiwari, Sudhir Kumar Gupta
We explore CP -violation effects of Higgs-top interactions in the associated production of a Higgs boson with top-pair in the dileptonic decay modes of top-quark originating from proton proton collisions pp→tt¯H→(l+νlb)(l−νl¯b¯)H at NLO in QCD matched to parton shower via T-odd observables using momenta of various particles involved in the process. In particular, we predict the constraints on the CP
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Laser-assisted two-proton radioactivity J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-26 You-Tian Zou, Jun-Hao Cheng, Yang-Yang Xu, Qiong Xiao, Si-Man Liu, Fu-Qiu Shao, Tong-Pu Yu
In this work, we systematically investigate the two-proton (2p) radioactivity assisted by an ultra-intense laser field within a deformed one-parameter model (OPM). The results show that the ultra-intense laser hardly affects the preformation probability of the emitted 2p-pair, but it can change the 2p radioactive half-lives to a finite extent by affecting the penetrability probability. Moreover, we
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Neutrinoless double beta decay and sterile neutrino dark matter in extended left right symmetric model J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-26 Bichitra Bijay Boruah, Nayana Gautam, Mrinal Kumar Das
We have studied a flavor symmetry-based extended left–right symmetric model (LRSM) with a dominant type-II seesaw mechanism and have explored the associated neutrino phenomenology. The particle content of the model includes usual quarks and leptons along with additional sterile fermion per generation in the fermion sector while the scalar content contains Higgs doublets and scalar bidoublet. Realization
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Properties of the single-particle spectrum generated by the mixed fractional rotation group J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-22 R Budaca
The deformation-related properties of the single-particle spectrum generated by a fractional rotational group with mixed derivative definitions are investigated in order to ascertain the spectrum's suitability as a viable microscopic model. A new parametrization is proposed based on fits on experimental single-particle levels. The performance of the resulting model is judged by calculating the microscopic
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Influence of light neutron-rich exotic nuclei in deciding abundance patterns relevant for explosive nucleosynthesis J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-15 J Barman, S Sarkar, R Chatterjee
Exotic neutron-rich nuclei play an important role in r-process nucleosynthesis. We study the effect of including proper nuclear structure to calculate neutron capture and photodisintegration rates, especially for 19C and 20N, under the aegis of post-form distorted wave Born approximation (FRDWBA). Considering a network of neutron-rich C–N–O isotopes, we show the effect on abundance calculations in
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Measurement of mass-angle and mass-total kinetic energy distributions from the fission of 190Pt compound nucleus J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-15 Vikas , Kavita , K S Golda, T K Ghosh, A Jhingan, P Sugathan, A Chatterjee, B R Behera, Ashok Kumar, Rakesh Kumar, N Saneesh, Mohit , Abhishek Yadav, C Yadav, S Appannababu, S K Duggi, Rakesh Dubey, Kavita Rani, Neeraj Kumar, A Banerjee, A Rani, Kajal , Shoaib Noor, Jaimin Acharya, Hardev Singh
We have measured the fission fragment mass-angle and mass-total kinetic energy (TKE) distributions for the neutron-deficient 190Pt compound nucleus (CN) populated via 12C + 178Hf reaction, at around and above barrier energies. No mass-angle correlation was observed in the fission of 190Pt signifying the absence of quasi-fission events in the studied reaction. The observed mass-TKE distributions have
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Measurement of proton induced absolute production cross-section of 6.13, 6.92 and 7.12 MeV γ-rays from 16O(p,p ′γ )16O reaction J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-13 V Ranga, I Mazumdar, S P Weppner, S Panwar, R Sariyal, S M Patel, P B Chavan, A K Rhine Kumar, G Anil Kumar
In this article, we report the absolute production cross-section of 6.13, 6.92 and 7.12 MeV γ-rays from the 16O(p,p ′γ )16O reaction for incident proton energy range of 8-16 MeV. Angular distributions of the three γ-rays have been measured for seven angles at 9 MeV proton energy. A detailed phenomenological optical model potential (OMP) was set up to analyse the cross-section data. The OMP parameters
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Lorentz violation in γ-pair production (e + e − → γ γ) J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-13 Alessio T B Celeste, Adriano M Santos
In this paper, we investigate the production process of a photon pair in a regime of quantum electrodynamics, considering the presence of a constant four-vector that defines a privileged direction in spacetime, resulting in Lorentz symmetry violation. We explore Lorentz violation in the context of vectorial nonminimal coupling, where we analyze the modifications introduced by this coupling in the scattering
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Neutrino oscillations as a single Feynman diagram J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-08 S Kovalenko, F Šimkovic
We propose an approach to neutrino oscillations in vacuum, based on quantum field theory (QFT). The neutrino emission and detection are identified with the charged-current vertices of a single second-order Feynman diagram for the underlying process, enclosing neutrino propagation between these two points. The key point of the presented approach is the definition of the space-time setup typical for
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Feasibility study to characterize the production of antineutrons in high energy pp collisions through charge exchange interactions J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-06 F Lugo-Porras, D M Gomez-Coral, A Menchaca-Rocha
Simulations to evaluate the feasibility of antineutron identification and kinematic characterization via the hadronic charge exchange (CEX) interaction n+n¯→p+p¯ are reported. The target neutrons are those composing the silicon nuclei of which inner tracking devices present in the Large Hadron Collider experiments ALICE, ATLAS, and CMS. Simulations of pp collisions in PYTHIA were carried out at different
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Level structures of 96Tc and their microscopic description J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-06 A K Rana, S Sihotra, H P Sharma, V Singh, G H Bhat, S Jehangir, J A Sheikh, N Rather, Kuldeep2, N Singh, R K Bhowmik, R Kumar, R P Singh, S Muralithar, Pooja Chauhan, Dalip Singh Verma, T Trivedi, S Kumar, R Palit, D Mehta
High spin states in the 96Tc nucleus were populated in the 75As(28Si, 4p3n) fusion-evaporation reaction at E lab = 120 MeV and the de-excitations were investigated through in-beam γ-ray spectroscopic techniques using indian national gamma array spectrometer consisting of 18 clover Ge detectors. The present level scheme of the 96Tc nucleus has been extended substantially with the addition of about forty
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Nonperturbative theory for the QED corrections to elastic electron-nucleus scattering J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-06 D H Jakubassa-Amundsen
A potential for the vertex and self-energy correction is derived from the first-order Born theory. The inclusion of this potential in the Dirac equation, together with the Uehling potential for vacuum polarization, allows for a nonperturbative treatment of these quantum electrodynamical effects within the phase-shift analysis. Investigating the 12C and 208Pb targets, a considerable deviation of the
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Spectroscopic analysis of hidden-charm pentaquarks J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-01 Ankush Sharma, Alka Upadhyay
In this work, the multiquark approach is used to analyze the spectroscopy of hidden-charm pentaquark states, motivated by recent discoveries at the LHCb collaboration. Using the SU(3) flavor representation, pentaquarks having J P = 5/2− are arranged into 10 (decuplet) of the SU(3) flavor multiplets. The masses of pentaquarks are calculated using the extension of the Gursey–Radicati mass formula and
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Alternative 3-3-1 models with exotic electric charges J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-01 Eduard Suarez, Richard H Benavides, Yithsbey Giraldo, William A Ponce, Eduardo Rojas
We report the most general classification of 3-3-1 models with β=3 . We found several solutions where anomaly cancellation occurs among fermions of different families. These solutions are particularly interesting as they generate non-universal heavy neutral vector bosons. Non-universality in the standard model fermion charges under an additional gauge group generates charged lepton flavor violation
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Exploring anisotropic flow via the Boltzmann transport equation employing the Tsallis blast wave description at LHC energies J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-02-01 Aviral Akhil, Swatantra Kumar Tiwari
Anisotropic flows i.e. azimuthal anisotropies in the particle production are one of the important probes in characterizing the properties of the strongly interacting matter created in the relativistic heavy-ion collisions. These observables are sensitive to both the transport properties as well as the equation of state of the quantum chromodynamics matter. We have adopted the Boltzmann transport equation
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The charge and mass symmetry breaking in the KK K¯ system J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-01-30 I Filikhin, R Ya Kezerashvili, B Vlahovic
In the framework of the Faddeev equations in configuration space, we investigate the K(1460) meson as a resonant state of the KKK¯ kaonic system. We perform calculations for the particle configurations K 0 K + K − and K0K+K0¯ within two models: the ABC model, in which all three particles are distinguishable, and the AAC model when two particles are identical. The models differ in their treatment of
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Pairing effects on pure rotational energy of nuclei J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-01-25 K Abe, H Nakada
By applying the angular-momentum projection to the self-consistent axial mean-field solutions with the semi-realistic effective Hamiltonian M3Y-P6, the pairing effects on the pure rotational energy of nuclei, i.e. the rotational energy at a fixed intrinsic state, have been investigated. While it was shown at the Hartree–Fock (HF) level that the individual terms of the Hamiltonian contribute to the
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Searches for baryon number violation in neutrino experiments: a white paper J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-01-23 P S B Dev, L W Koerner, S Saad, S Antusch, M Askins, K S Babu, J L Barrow, J Chakrabortty, A de Gouvêa, Z Djurcic, S Girmohanta, I Gogoladze, M C Goodman, A Higuera, D Kalra, G Karagiorgi, E Kearns, V A Kudryavtsev, T Kutter, M Malinský, D A Martinez Caicedo, R N Mohapatra, P Nath, S Nussinov, J P Ochoa-Ricoux, V Pec, A Rafique, J Rodriguez Rondon, R Shrock, H W Sobel, T Stokes, M Strait, R Svoboda
Baryon number conservation is not guaranteed by any fundamental symmetry within the standard model, and therefore has been a subject of experimental and theoretical scrutiny for decades. So far, no evidence for baryon number violation has been observed. Large underground detectors have long been used for both neutrino detection and searches for baryon number violating processes. The next generation
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Daily and annual modulation rate of low mass dark matter in silicon detectors J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-01-22 Abolfazl Dinmohammadi, Matti Heikinheimo, Nader Mirabolfathi, Kai Nordlund, Hossein Safari, Sebastian Sassi, Kimmo Tuominen
Low-threshold solid-state detectors with single electron excitation sensitivity can probe nuclear recoil energies in the sub-100 eV range, coinciding with the typical threshold displacement energies in the detector material. We investigate the daily and annual modulation of the observable event rate for dark matter mass ranging from 0.2 to 5 GeV/c2 in a silicon detector, considering the energy threshold
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Fate of false vacuum in non-perturbative regimes J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-01-18 Marco Frasca, Anish Ghoshal, Nobuchika Okada
We use some exact results in scalar field theory to revise the analysis by Coleman and Callan about false vacuum decay and propose a simple non-perturbative formalism. We introduce an exact Green’s function which incorporates non-perturbative corrections in the strong coupling regimes of the theory. The solution of the scalar field theory involves the Jacobi elliptical function and has been used to
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Influence of hyperon–hyperon interaction on the properties of neutron stars J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2024-01-11 R M Aguirre
The properties of neutron stars are studied in a composite model of the strong interaction. In the regime of low to medium baryonic densities a covariant hadronic model is adopted which includes an exclusive channel for the hyperon–hyperon interaction mediated by hidden strangeness mesons, which in turn couple to other mesons through polynomial vertices. The new coupling constants are subject to phenomenological
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Heavy quark energy loss through polarization and radiation in the hot QCD medium J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-28 Jai Prakash, Mohammad Yousuf Jamal
We present a comparative study on the heavy quarks energy loss through medium polarization and gluon radiation in the quark-gluon plasma. To do so, we investigated the energy loss per unit length and drag coefficient for both cases. To have better contrast, we also obtained the nuclear modification factor employing Langevin dynamics. The comparison shows that the polarization effect dominates at lower
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New physics hints from τ scalar interactions and (g − 2) e,μ J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-28 Francisco J Botella, Fernando Cornet-Gomez, Carlos Miró, Miguel Nebot
We consider a flavour conserving two Higgs doublet model that consists of a type I (or X) quark sector and a generalized lepton sector where the Yukawa couplings of the charged leptons to the new scalars are not proportional to the lepton masses. The model, previously proposed to solve both muon and electron g − 2 anomalies simultaneously, is also capable to accommodate the ATLAS excess in pp → S →
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Probing beyond the standard model physics with double-beta decays J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-28 Elisabetta Bossio, Matteo Agostini
Nuclear double-beta decays are a unique probe to search for new physics beyond the standard model. Hypothesized particles, non-standard interactions, or the violation of fundamental symmetries would affect the decay kinematics, creating detectable and characteristic experimental signatures. In particular, the energy distribution of the electrons emitted in the decay gives an insight into the decay
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Isoscaling in dilute warm nuclear systems J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-13 Alex Rebillard-Soulié, Rémi Bougault, Helena Pais, Bernard Borderie, Abdelouahad Chbihi, Caterina Ciampi, Quentin Fable, John Frankland, Emmanuelle Galichet, Tom Génard, Diégo Gruyer, Nicolas Le Neindre, Ivano Lombardo, Olivier Lopez, Loredana Manduci, Marian Pârlog, Giuseppe Verde
Heavy-ion collisions are a good tool to explore hot nuclear matter below saturation density, ρ 0. It has been established that if a nuclear system reaches the thermal and chemical equilibrium, this leads to scaling properties in the isotope production when comparing two systems which differ in proton fraction. This article presents a study of the isoscaling properties of an expanding gas source exploring
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Energy and system size dependence of strongly intensive fluctuation measures in heavy-ion collisions at FAIR energies J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-12 Bushra Ali, Shakeel Ahmad, A Ahmad
Event-by-event fluctuations of multiplicity and transverse momentum of charged hadrons produced in heavy-ion collisions at FAIR energies, 10A, 20A, 30A, and 40A GeV are studied in the framework of relativistic transport model, URQMD. Dependence of two families of strongly intensive measures of multiplicity(N) and transverse momentum (p T) fluctuations, Δ[p T, N] and Σ[p T, N], on collision centrality
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Systematic study of fusion suppression and its dependency on projectile breakup threshold energy J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-07 Sabir Ali, Muntazir Gull, Kamal Kumar, Tauseef Ahmad, I A Rizvi, Avinash Agarwal, S S Ghugre, R N Ali, Faizan Khan
Measurements of the excitation function (EF) of the observed evaporation residues (ERs) populated in the 20Ne + 93Nb reaction at E lab ≈ 91−145 MeV are carried out to explore the systematic of fusion suppression and its dependency on projectile breakup threshold energy, by employing the offline γ-ray detection method. The EF of the observed ERs populated through complete and/or incomplete fusion processes
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Effects of the quark flavour thresholds in the hadronic vacuum polarization contributions to the muon anomalous magnetic moment J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-07 A V Nesterenko
The equivalent representations for the hadronic vacuum polarization contributions to the muon anomalous magnetic moment aμHVP in the presence of the quark flavour thresholds are studied. Specifically, the explicit relations between the contributions given by the integration over a finite kinematic interval to aμHVP expressed in terms of the hadronic vacuum polarization function, Adler function, and
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Study on muon MDM and lepton EDM in BLMSSM via the mass insertion approximation J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-07 Xi Wang, Xin-Xin Long, Yi-Tong Wang, Tong-Tong Wang, Hai-Bin Zhang, Tai-Fu Feng, Rong-Xiang Zhang, Shu-Min Zhao
In the framework of the MSSM extension with local gauged baryon and lepton numbers (BLMSSM), we calculate the muon anomalous magnetic dipole moment (MDM) and lepton (e, μ, τ) electric dipole moment (EDM), and discuss how the muon MDM and lepton EDM depend on the parameters within the mass insertion approximation. Among many parameters, tanβ , g L , m L and μ H are more sensitive parameters for aμBL
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Study of forward–backward correlation and multiplicity fluctuations of pions produced in p–p collisions at recent LHC energies J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-06 Subhadeep Paul, Shreya Bhattacharjee, Azharuddin Ahmed, Tumpa Biswas, Mehedi Kalam, Prabir Kr Haldar
The two-particle rapidity correlation among the pions produced in p–p collisions at recent LHC energies s= 2.76, 5.02, 7 and 13 TeV are studied in this paper by using the analysis of events generated by UrQMD-3.4, AMPT-2.26 and PYTHIA-8.3. Our investigation for bin-to-bin fluctuation using the variance of forward–backward asymmetry parameter σC2 in the forward–backward pseudo-rapidity windows is done
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Constrained neutrino mass matrix and Majorana phases J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-06 Pralay Chakraborty, Manash Dey, Subhankar Roy
We endeavour to constrain the neutrino mass matrix on the phenomenological ground and procure model-independent textures by emphasizing on the simple linear relationships among the mass matrix elements. These simple textures predict the two Majorana phases. In this regard, two types of parametrization of neutrino mass matrix: general and exponential are employed. We obtain fifty-three predictive neutrino
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Comparative study of neural network and model averaging methods in nuclear β-decay half-life predictions J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-06 W F Li, X Y Zhang, Y F Niu, Z M Niu
Nuclear β-decay half-lives are investigated using the two-hidden-layer neural network and compared with the model averaging method. By carefully designing the input and hidden layers of the neural network, the neural network achieves better accuracy of nuclear β-decay half-life predictions and well eliminates the too strong odd–even staggering predicted by the previous neural networks. For nuclei with
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Search for the anomalous quartic gauge couplings through Z γ production at e − e + colliders J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-05 M Köksal
Spontaneous breaking of the SU2L×U1Y electroweak symmetry of the standard model (SM) sets the constraints on triple and quartic gauge couplings. Therefore, the measurement of multiboson production in e − e + collisions allows us to directly test the predictions of the SM and to indirectly probe new physics beyond the SM. In this paper, we focus on the process e − e + → e − Z γ e + with Z boson decaying
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Parameterizing smooth viscous fluid dynamics with a viscous blast wave J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-12-05 Zhidong Yang, Rainer J Fries
Blast wave fits are widely used in high energy nuclear collisions to capture essential features of global properties of systems near kinetic equilibrium. They usually provide temperature fields and collective velocity fields on a given hypersurface. We systematically compare blast wave fits of fluid dynamic simulations for Au+Au collisions at sNN=200GeV and Pb+Pb collisions at sNN=2.76 TeV with the
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Asymmetric particle-antiparticle Dirac equation: second quantization J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-11-24 Gustavo Rigolin
We build the fully relativistic quantum field theory related to the asymmetric Dirac fields first presented in a prequel to this work. These fields are solutions of the asymmetric Dirac equation, a Lorentz covariant Dirac-like equation whose positive and ‘negative’ frequency plane wave solutions’ dispersion relations are no longer degenerate. At the second quantization level, we show that this implies
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Asymmetric particle-antiparticle Dirac equation: first quantization J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-11-24 Gustavo Rigolin
We derive a Dirac-like equation, the asymmetric Dirac equation, where particles and antiparticles sharing the same wave number have different energies and momenta. We show that this equation is Lorentz covariant under proper Lorentz transformations (boosts and spatial rotations) and also determine the corresponding transformation law for its wave function. We obtain a formal connection between the
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Fermion mass hierarchy and mixing in simplified grand gauge–Higgs unification J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-11-16 Nobuhito Maru, Haruki Takahashi, Yoshiki Yatagai
Grand gauge–Higgs unification of five-dimensional SU(6) gauge theory on an orbifold S 1/Z 2 with localized gauge kinetic terms is discussed. The Standard Model (SM) fermions on the boundaries and some massive bulk fermions coupling to the SM fermions are introduced. Compared to the previous model, the number of bulk fermions is reduced, which reproduces the generation mixing of SM fermions and SM fermion
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Stop comparing resummation methods J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-11-15 Johan Löfgren
I argue that the consistency of any resummation method can be established if the method follows a power counting derived from a hierarchy of scales. I.e. whether it encodes a top-down effective field theory. This resolves much confusion over which resummation method to use once an approximation scheme is settled on. And if no hierarchy of scales exists, you should be wary about resumming. I give evidence
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The minimal flavor structure of quarks and leptons J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-11-15 Ying Zhang
A flavor structure with minimal parameters is proposed to address the fermion mass hierarchy and flavor mixing for quarks and leptons. Yukawa interaction is reconstructed in a new basis to show a common flat structure for up-type quarks, down-type quarks, charged leptons, and Dirac neutrinos. A SO(2)LRf flavor symmetry is found from the hierarchy masses of quarks and leptons, which dominated Cabib
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Measurement of neutron induced reaction cross-section of 99Mo J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-11-08 Mahima Upadhyay, Mahesh Choudhary, Namrata Singh, A Gandhi, Aman Sharma, Sumit Bamal, Akash Hingu, S Mukherjee, G Mishra, Sukanya De, L S Danu, Saurav Sood, Sajin Prasad, Ajay Kumar, R G Thomas, A Kumar
In the present work, we have measured 98Mo(n,γ)99Mo reaction cross-section using a 7Li(p,n)7Be neutron source at 1.67 ± 0.14, 2.06 ± 0.14 and 2.66 ± 0.16 MeV neutron energies. We have employed offline γ-ray spectroscopy to measure the induced activity of the sample. The 115In(n,n’γ)115mIn reaction was used as a monitor reaction. Different attributes propagating the uncertainty in the total result,
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Elliptic flow of inclusive charged hadrons in Au+Au collisions at E lab = 35 A GeV using the PHSD model J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-11-08 Waseem Bhat, M Farooq Mir, Vipul Bairathi, Towseef Bhat, Sonia Kabana, Shabir Bhat
Elliptic flow (v 2) of inclusive charged hadrons at mid-rapidity (∣η∣ < 1.0) in Au+Au collisions at E lab = 35 A GeV using the parton hadron string dynamics (PHSD) model are presented as a function of centrality, transverse momentum (p T) and pseudo-rapidity (η). The v 2 results are obtained using the η-sub event plane method with respect to the event plane angle (ψ 2) and participant plane angle (
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Unpolarized QED parton distribution functions in NLO J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-11-06 A B Arbuzov, U E Voznaya
Perturbative solutions for unpolarized QED parton distribution and fragmentation functions are presented explicitly in the next-to-leading logarithmic approximation. The scheme of iterative solution of QED evolution equations is described in detail. Terms up to (α3L2) are calculated analytically, where L=ln(μF2/me2) is the large logarithm which depends on the factorization energy scale μ F ≫ m e
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Soft and hard scales of the transverse momentum distribution in the color string percolation model J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-11-06 J R Alvarado García, D Rosales Herrera, P Fierro, J E Ramírez, A Fernández Téllez, C Pajares
In color string models, the transverse momentum distribution (TMD) is obtained through the convolution of the Schwinger mechanism with the string tension fluctuations distribution. Considering a q-Gaussian distribution for these fluctuations, the TMD becomes a hypergeometric confluent function that adequately reproduces the characteristic scales at low and high p T values. In this approach, the hard
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Hadron transverse momentum distributions in the Tsallis statistics with escort probabilities J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-11-01 A S Parvan
The exact and approximate hadron transverse momentum distributions for the Fermi–Dirac, Bose–Einstein and Maxwell-Boltzmann statistics of particles in the framework of the Tsallis statistics with escort probabilities (the Tsallis-3 statistics) have been derived. The classical and quantum transverse momentum distributions in the zeroth term approximation and the quantum transverse momentum distributions
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Enhanced dilepton emission from a phase transition in dense matter J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-10-25 Oleh Savchuk, Anton Motornenko, Jan Steinheimer, Volodymyr Vovchenko, Marcus Bleicher, Mark Gorenstein, Tetyana Galatyuk
It is demonstrated that the presence of a phase transition in heavy-ion collisions, at beam energies that probe dense quantum chromodynamics (QCD) matter, leads to a significant enhancement of the dilepton yield at low invariant mass and requires the embedding of low beam energies per produced pion due to the extended emission time. In addition, the temperature of low-mass dileptons shows a modest
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Electron scattering and neutrino physics J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-10-25 A M Ankowski, A Ashkenazi, S Bacca, J L Barrow, M Betancourt, A Bodek, M E Christy, L Doria, S Dytman, A Friedland, O Hen, C J Horowitz, N Jachowicz, W Ketchum, T Lux, K Mahn, C Mariani, J Newby, V Pandey, A Papadopoulou, E Radicioni, F Sánchez, C Sfienti, J M Udías, L Weinstein, L Alvarez-Ruso, J E Amaro, C A Argüelles, A B Balantekin, S Bolognesi, V Brdar, P Butti, S Carey, Z Djurcic, O Dvornikov
A thorough understanding of neutrino–nucleus scattering physics is crucial for the successful execution of the entire US neutrino physics program. Neutrino–nucleus interaction constitutes one of the biggest systematic uncertainties in neutrino experiments—both at intermediate energies affecting long-baseline deep underground neutrino experiment, as well as at low energies affecting coherent scattering
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Optimization of convolutional neural networks for background suppression in the PandaX-III experiment J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-10-25 Shangning Xia, Suizhi Huang, Kexin Xu, Tao Li, Xun Chen, Ke Han, Shaobo Wang
The tracks recorded by a gaseous detector provide a possibility for charged particle identification. For searching the neutrinoless double beta decay events of 136Xe in the PandaX-III experiment, we optimized the convolutional neural network based on the Monte Carlo simulation data to improve the signal-background discrimination power. EfficientNet is chosen as the baseline model and the optimization
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Signatures of elongated and compact configurations in the fusion barrier distribution of deformed nuclei J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-10-25 F A Fareed, W M Seif, A Adel, I A M Abdul-Magead
The fusion barrier distributions (BD) of 11 fusion reactions are investigated to understand the role of orientation as a degree of freedom in the fusion mechanism involving deformed nuclei, and seeking signatures of cold and hot fusion. We compared the experimentally extracted BD with those calculated using the coupled-channel method, starting from orientation-dependent folding potentials based on
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Spin dynamics of triaxial odd mass nuclei with quasiparticle alignments J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-10-18 R Budaca, A I Budaca
The dynamics of medium odd-mass nuclei with triaxial cores and non-axial rigid quasiparticle alignments is investigated in a semiclassical approach. Quantum observables are computed with a Schrödinger equation, constructed from the classical picture, which has the total angular momentum projection as a continuous variable. The separation of potential energy as a function of the chosen variable allows
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Analyzing beam-gas interactions in an H2+ cyclotron beam J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-10-18 Pedro Calvo, Daniel Winklehner, Concepción Oliver, on behalf of the IsoDAR collaboration
For the Isotope Decay At Rest (IsoDAR) experiment in neutrino physics (searching for sterile neutrinos), we have developed a novel compact isochronous cyclotron with direct injection through an axially embedded RFQ. For IsoDAR to be decisive within five years of running, 10 mA of protons, cw at 80% duty factor are needed on a neutrino production target. To alleviate space charge in the cyclotron driver
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The top quark chromomagnetic dipole moment in the SM from the 4-body vertex function J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-10-12 J Montaño-Domínguez, F Ramírez-Zavaleta, E S Tututi, E Urquiza-Trejo
A new proposal to compute the anomalous chromomagnetic dipole moment of the top quark, μˆt , in the Standard Model is presented. On the basis of the five-dimensional effective Lagrangian operator that characterizes the quantum-loop induced chromodipolar vertices gtt¯ and ggtt¯ , the μˆt anomaly is derived via radiative correction at the 1-loop level from the non-Abelian 4-body vertex function ggtt¯
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The role of U(1) A symmetry breaking in the QCD corrections to the pion mass difference J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-10-12 Mahammad Sabir Ali, Chowdhury Aminul Islam, Rishi Sharma
The charged and neutral pion mass difference can be attributed to both the quantum electrodynamics and QCD contributions. The current quark mass difference (Δm) is the source of the QCD contribution. Here, in a two-flavour non-local Nambu–Jona-Lasinio model, we try to estimate the QCD contribution. Interestingly, we find that the strength of the U1A symmetry-breaking parameter c plays a crucial role
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Flavor changing neutral current processes and family discrimination in 3-3-1 models J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-09-26 Vinícius Oliveira, C A de S Pires
In 3-3-1 models, anomaly cancellation requires that one of the three families of quarks transforms as triplet by SU3L , with the other two transforming necessarily as anti-triplet. This is an important feature of the model because, with it, we explain family replication. Thus it is mandatory to discriminate which of the families will transform as triplet by SU3L because the main consequence of anomaly
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The solenoidal large intensity device (SoLID) for JLab 12 GeV J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-09-25 J Arrington, J Benesch, A Camsonne, J Caylor, J-P Chen, S Covrig Dusa, A Emmert, G Evans, H Gao, J-O Hansen, G M Huber, S Joosten, V Khachatryan, N Liyanage, Z-E Meziani, M Nycz, C Peng, M Paolone, W Seay, P A Souder, N Sparveris, H Spiesberger, Y Tian, E Voutier, J Xie, W Xiong, Z-Y Ye, Z Ye, J Zhang, Z-W Zhao, X Zheng, For the Jefferson Lab SoLID Collaboration
The solenoidal large intensity device (SoLID) is a new experimental apparatus planned for Hall A at the Thomas Jefferson National Accelerator Facility (JLab). SoLID will combine large angular and momentum acceptance with the capability to handle very high data rates at high luminosity. With a slate of approved high-impact physics experiments, SoLID will push JLab to a new limit at the QCD intensity
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Solution of lepton g − 2 anomalies with nonlocal QED J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-09-25 Hang Li, P Wang
An explanation using nonlocal quantum electrodynamics (QED) for lepton g − 2 anomalies is provided that is a simple extension of the standard model. This solution is based on the same gauge symmetry as QED without introducing any new particles and interactions. The correlation functions in the nonlocal strength tension and lepton–photon interaction make it possible to explain the discrepancies of both
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The exploration of hot and dense nuclear matter: introduction to relativistic heavy-ion physics J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-09-14 Hannah Elfner, Berndt Müller
This article summarizes our present knowledge about nuclear matter at the highest energy densities and its formation in relativistic heavy ion collisions. We review what is known about the structure and properties of the quark-gluon plasma and survey the observables that are used to glean information about it from experimental data.
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Probe of axion-like particles in vector boson scattering at a muon collider J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-09-05 S C İnan, A V Kisselev
We have examined the sensitivity of the axion-like particles (ALP) couplings to electroweak gauge bosons in the diphoton production at a future muon collider. The collisions at the μ + μ − energies of 3 TeV, 14 TeV, and 100 TeV are addressed. The differential cross sections versus the invariant mass of the final photons and total cross section versus minimal diphoton invariant mass are presented. We
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Radiative B to tensor meson decays at NLO in SCET J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-08-18 Arslan Sikandar, M Jamil Aslam
The radiative B to tensor K2*(1430),f2(1270),a2(1320) meson decays are studied at next-to-leading order in soft-collinear effective theory (SCET). The SCET allows the systematic treatment of factorizable and non-factorizable contributions along with the resummation of large perturbative logarithms. We performed a two-step matching and determined the soft-overlap function ζT⊥ and branching ratios for
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Neutrino spin-flavour precession in magnetized white dwarf J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-08-16 Jyotismita Adhikary, Ashutosh Kumar Alok, Arindam Mandal, Trisha Sarkar, Shreya Sharma
Due to notoriously small value of the neutrino magnetic moment, the phenomena of neutrino spin flavour precession (SFP) require a very high magnetic field. This makes only a handful of systems suitable to study this phenomenon. By the observation of SFP, the Dirac and Majorana nature of neutrinos is expected to be distinguished. In this work, we point out the potential of the white dwarf (WD) system
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Quantifying the underlying event: investigating angular dependence of multiplicity classes and transverse-momentum spectra in high-energy pp collisions at LHC energies J. Phys. G Nucl. Partic. Phys. (IF 3.5) Pub Date : 2023-08-16 Aditya Nath Mishra, Gergely Gábor Barnaföldi, Guy Paić
We present a study of the transverse momentum spectra of charged hadrons and their evolution as a function of their azimuthal position with respect to the leading particle in proton–proton collisions at s = 13 TeV using the PYTHIA8 Monte Carlo event generator with the Monash 2013 tune. The spherocity distribution in the same azimuthal bins is reported. The Multiplicity and midrapidity transverse momentum