In the paper we study the Yang–Mills effective action in the four-dimensional spacetime by using background field formalism. We give an explicit way of cutoff regularization procedure, then do a two-loop renormalization and calculate a second β -function coefficient. We also show that the two-loop singularity contains only logarithmic part in the first degree. At the same time additional properties

LHC ##IMG## [http://ej.iop.org/images/0954-3899/48/1/015003/gabb1b6ieqn1.gif] {$t\overline{t}$} data have the potential to provide constraints on the gluon distribution, especially at high x , with both ATLAS and CMS performing differential measurements. Recently, CMS has measured double-differential ##IMG## [http://ej.iop.org/images/0954-3899/48/1/015003/gabb1b6ieqn2.gif] {$t\overline{t}$} distributions

We use perturbation theory to obtain neutrino oscillation probabilities, including the standard mass-mixing paradigm and non-standard neutrino interactions (NSI). The perturbation is made on the standard parameters ##IMG## [http://ej.iop.org/images/0954-3899/48/1/015001/gabae17ieqn1.gif] {${\Delta}{m}_{21}^{2}/{\Delta}{m}_{31}^{2}$} and sin 2 ( θ 13 ) and on the non-diagonal NSI parameters, but keeps

The luminosity constraint is a very precise relationship linking the power released by the Sun as photons and the solar neutrino fluxes. Such a relation, which is a direct consequence of the physical processes controlling the production and the transport of energy in the solar interior, is of great importance for the studies of solar neutrinos and has a special role for the search of neutrinos from

We perform extended Thomas–Fermi calculations in the Wigner–Seitz cell below and above neutron drip with realistic functionals. The resulting energy density is decomposed as a sum of bulk terms and a surface term, and a compressible liquid drop analytical formula is used to fit the surface tension. The effect of curvature terms and neutron skin is studied in detail. A very good reproduction of the

In the analysis of the heavy-ion above-barrier fusion cross-sections of complex nuclei, the relativistic effects are usually ignored. In the present work, we undertake a step toward accounting for these effects. Namely, the nucleus–nucleus interaction potential is obtained using the double-folding model with six different effective nucleon–nucleon (NN) forces coming from the relativistic mean field

This white paper reports on the discussions of the 2018 Facility for Rare Isotope Beams Theory Alliance (FRIB-TA) topical program ‘From bound states to the continuum: Connecting bound state calculations with scattering and reaction theory’. One of the biggest and most important frontiers in nuclear theory today is to construct better and stronger bridges between bound state calculations and calculations

Weak decays in heavy nuclei with charge numbers Z = 101–109 are studied within a microscopic formalism based on deformed self-consistent Skyrme Hartree–Fock mean-field calculations with pairing correlations. The half-lives of β + decay and electron capture are compared with α -decay half-lives obtained from phenomenological formulas. Transfermium isotopes of Md, No, Lr, Rf, Db, Sg, Bh, Hs, and Mt that

I analyze a possibility of building an isobar model of the kaon–hyperon pair photoproduction in the γp → K + Λ, ##IMG## [http://ej.iop.org/images/0954-3899/47/12/125006/gabb5bbieqn2.gif] {$\gamma p\to {K}_{S}^{0}{{\Sigma}}^{+}$} , and γp → K + Σ processes, where the Born terms play a comparatively small role in the full amplitude. The total width of hadron resonances can be written in the form of a

In this paper, we study in detail the phenomenology of the non-SM SU (2) V singlet Higgs boson ##IMG## [http://ej.iop.org/images/0954-3899/47/12/125005/gabaddfieqn3.gif] {${H}_{1}^{0}$} at the 14 TeV Large Hadron Collider (LHC) in the Georgi–Machacek (GM) model. We present a systematic comparison of the production mechanisms and decay modes of ##IMG## [http://ej.iop.org/images/0954-3899/47/12/125005/gabaddfieqn4

The need to enforce fermionic antisymmetry in the nuclear many-body problem commonly requires use of single-particle coordinates, defined relative to some fixed origin. To obtain physical operators which nonetheless act on the nuclear many-body system in a Galilean-invariant fashion, thereby avoiding spurious center-of-mass contributions to observables, it is necessary to express these operators with

In this paper we discuss the interacting hadron resonance gas (HRG) model in presence of a constant external magnetic field. The short range repulsive interaction between hadrons are accounted through Van der Waals excluded volume correction to the ideal gas pressure. Here we take the sizes of hadrons as r π (pion radius) = 0 fm, r K (kaon radius) = 0.35 fm, r m (all other meson radii) = 0.3 fm and

We discuss an experiment to investigate neutrino physics at the LHC, with emphasis on tau flavour. As described in our previous paper Beni et al (2019 J. Phys. G: Nucl. Part. Phys. 46 115008), the detector can be installed in the decommissioned TI18 tunnel, ≈480 m downstream the ATLAS cavern, after the first bending dipoles of the LHC arc. The detector intercepts the intense neutrino flux, generated

High spin states in 104 Pd were populated via 94 Zr( 13 C, 3n γ ) fusion-evaporation reaction at a beam energy of 55 MeV. The Indian National Gamma Array was utilized to detect the de-exciting γ -rays. Lifetimes of states in the negative parity bands have been determined using the Doppler shift attenuation method. The present lifetime results suggest a moderate quadrupole deformation ( β 2 ≈ 0.2) for

In this study we present a unified phenomenological analysis of the scalar glueball and scalar meson spectra within an AdS/QCD framework in the bottom up approach. For this purpose we generalize the recently developed graviton soft-wall (GSW) model, which has shown an excellent agreement with the lattice QCD glueball spectrum, to a description of glueballs and mesons with a unique energy scale. In

We illustrate the connection between electron and neutrino scattering off nuclei and show how the former process can be used to constrain the description of the latter. After reviewing some of the nuclear models commonly used to study lepton-nucleus reactions, we describe in detail the SuSAv2 model and show how its predictions compare with the available electron- and neutrino-scattering data over the

A large wealth of data and a variety of models led to significant progress in understanding the spectra of deformed nuclei. However, a robust theoretical approach, which is less reliant on adjustable parameters is still elusive. Due to the scarcity of data, this drawback gets more pronounced while studying the exotic nuclei. With the motive to overcome this difficulty, we have developed the nonadiabatic

The event-by-event fluctuations of the mean transverse momentum ( p t ) in Au + Au collisions at ##IMG## [http://ej.iop.org/images/0954-3899/47/12/125102/gabb44eieqn1.gif] {$\sqrt{{s}_{\text{NN}}}=7.7$} –200 GeV and Pb + Pb collisions at ##IMG## [http://ej.iop.org/images/0954-3899/47/12/125102/gabb44eieqn2.gif] {$\sqrt{{s}_{\text{NN}}}=2.76\enspace \mathrm{T}\mathrm{e}\mathrm{V}$} are analyzed using

We study the possibility of texture zeros in Majorana light neutrino mass matrix in the light of dark large mixing angle (DLMA) solution to solar neutrino problem where solar mixing angle (sin 2 θ 12 ≃ 0.7) lies in the second octant instead of first octant in standard large mixing angle (LMA) scenario (sin 2 θ 12 ≃ 0.3). In three neutrino scenario, we find that LMA and DLMA solutions lead to different

We revisit the rare decays of the Higgs boson to two different quarks in the standard model (SM), which arise at the one-loop level. We perform Taylor series expansions to the complete form factors of the decay amplitudes, according to their different mass hierarchies, this allow us to take full advantage of the Glashow–Iliopoulos–Maiani (GIM) mechanism to eliminate spurious contributions and retain

We perform a comprehensive study of partonic energy loss reflected in the nuclear modification factors of charged particles and jets measured in PbPb collisions at ##IMG## [http://ej.iop.org/images/0954-3899/47/12/125103/gabb58aieqn1.gif] {$\sqrt{{s}_{\text{NN}}}$} = 2.76 and 5.02 TeV in wide transverse momentum ( p T ) and centrality range. The p T distributions in pp collisions are fitted with a

The puzzle remains in the large discrepancy between neutron lifetime measured by the two distinct experimental approaches—counts of beta decays in a neutron beam and storage of ultracold neutrons in a potential trap, namely, the beam method versus the bottle method. In this paper, we propose a new experiment to measure the neutron lifetime in a cold neutron (CN) beam with a sensitivity goal of 0.1%

There has been much recent interest in nuclear fission, due in part to a new appreciation of its relevance to astrophysics, stability of superheavy elements, and fundamental theory of neutrino interactions. At the same time, there have been important developments on a conceptual and computational level for the theory. The promising new theoretical avenues were the subject of a workshop held at the

One of the main neutrino oscillation parameters whose value has not been determined very precisely is the leptonic δ CP phase. Since neutrinos have a tiny but finite mass they can undergo decay both visibly and invisibly. The effect of invisible decay of the third mass eigen state ν 3 on the sensitivity to δ CP is analysed here using atmospheric neutrino and anti-neutrino events. Effects of detector

A recent solution of the hyperon puzzle by a first order phase transition to color superconducting quark matter is revisited in order to replace the Maxwell construction by an interpolation method which describes a mixed phase. To do this, we apply for the first time the finite-range polynomial interpolation method for constructing a transition between hadronic and quark matter phases to the situation

The electric dipole E1 strength in the well-deformed even–even 152–162 Gd was calculated using a model based on translational and Galilean invariant quasi-particle random phase approximation (QRPA), where for the first time the highly-fragmented E1 strength has been predicted below the particle threshold energy. The predicted concentration of the electric dipole excitations exhausts less than 2% of

Magnetic dipole (M1) excitation is the leading mode of multi-nucleon excitations induced by the magnetic field, and is a phenomenon of the spin–orbit splitting and residual interactions involved. In this work, we investigate the effects of the residual interactions on the M1 excitation from a novel perspective, the framework of relativistic nuclear energy-density functional. The relativistic Hartree–Bogoliubov

The bottomonium mass spectra are computed in the framework of potential non-relativistic quantum chromodynamics. The potential consists of a static term incorporating the Coulomb plus confinement part along with a correction term added non-perturbatively from pNRQCD, which is classified in powers of the inverse of the heavy quark mass O (1/ m ). The masses of excited bottomonia are calculated by perturbatively

Within the collective Bohr Hamiltonian, the adoption of a mass tensor as a function of collective coordinates has demonstrated its importance for describing the structure of nuclei. On the other hand, for odd-mass nuclei, the Coriolis interaction between the rotational and single-particle motions affects significantly the structure of nuclear excited states. In the framework of a recently developed

The impact parameter is one of the crucial physical quantities of heavy-ion collisions, and can affect obviously many observables at the final state, such as the multifragmentation and the collective flow. Usually, it cannot be measured directly in experiments but might be inferred from observables at the final state. Artificial intelligence has had great success in learning complex representations

In this work, we propose new five texture zeros for the mass matrices in the lepton sector in order to predict neutrino masses. In our approach, we extend beyond the standard model (SM) by assuming Dirac masses for the neutrinos, a feature which allows us to make a theoretical prediction for the lightest neutrino mass in the normal ordering. The textures that were analyzed have enough free parameters

The experimental predictions of R D , ##IMG## [http://ej.iop.org/images/0954-3899/47/11/115001/gaba422ieqn3.gif] {${R}_{{D}^{{\ast}}}$} , R J / ψ , ##IMG## [http://ej.iop.org/images/0954-3899/47/11/115001/gaba422ieqn4.gif] {${P}_{\tau }^{{D}^{{\ast}}}$} and ##IMG## [http://ej.iop.org/images/0954-3899/47/11/115001/gaba422ieqn5.gif] {${F}_{\mathrm{L}}^{{D}^{{\ast}}}$} in B decays mediated via ##IMG##

Weak magnetic-field-induced corrections to effective coupling constants describing light vector meson mixing and vector meson dominance (VMD) are derived. The magnetic field must be weak with respect to an effective quark mass M * such that: ##IMG## [http://ej.iop.org/images/0954-3899/47/11/115102/gaba7c9ieqn1.gif] {$e{B}_{0}/{{M}^{{\ast}}}^{2}{< }1$} or ##IMG## [http://ej.iop.org/images/0954-3899

The phenomenon of quartet condensation in the ground state of an isovector pairing Hamiltonian for an even–even N = Z system is investigated. For this purpose we follow the evolution of the ground state from an unperturbed regime up to a strongly interacting one in a formalism of collective pairs. These pairs are those resulting from the diagonalization of the pairing Hamiltonian in a space of two

Probabilistic machine learning techniques can learn both complex relations between input features and output quantities of interest as well as take into account stochasticity or uncertainty within a data set. In this initial work, we explore the use of one such probabilistic network, the mixture density network (MDN), to reproduce fission yields and their uncertainties. We study mass yields for the

In this review we present and discuss the determination of the magnitude of the Cabibbo–Kobayashi–Maskawa (CKM) matrix parameter V cb . The CKM matrix parametrizes the weak charged current interactions of quarks in the standard model (SM), and a precise determination of its elements has always been one of the most important targets of particle physics. The precise knowledge of the | V cb | value plays

The superheavy nuclei have been examined systematically in the region 158 ⩽ N ⩽ 218, 162 ⩽ N ⩽ 212 for Z = 122 and 128, respectively. The explicit density-dependent meson-exchange (DD-ME) and point-coupling (DD-PC) models within the framework of covariant density functional theory (CDFT) have been used to study the structural and decay properties of the isotopic series which includes the separable

Electromagnetic and weak transitions tell us a great deal about the structure of atomic nuclei. Yet modeling transitions can be difficult: it is often easier to compute the ground state, if only as an approximation, than excited states. One alternative is through transition sum rules, in particular the non-energy-weighted and energy-weighted sum rules, which can be computed as expectation values of

Properties of nuclear matter are investigated in the framework of relativistic Brueckner–Hartree–Fock model with the latest high-precision charge-dependent Bonn (pvCD-Bonn) potentials, where the coupling between pion and nucleon is adopted as a pseudovector form. These realistic pvCD-Bonn potentials are renormalized to effective nucleon–nucleon (NN) interactions, G matrices. They are obtained by solving

Charged particles at the crust of compact stars may be ejected and accelerated by the induced electric field generated due to the rotation of the magnetized star. For neutron or hybrid stars, the negatively charged particles are usually electrons, and the positively charged particles are mainly protons and iron. Whereas, the existence of strange stars also includes the possibility of ejection of strangelets

The renormalization group relations for the higher-order hadronic vacuum polarization function perturbative expansion coefficients are studied. The folded recurrent and unfolded explicit forms of such relations are obtained. The explicit expression for the coefficients, which incorporate the contributions of the π 2 -terms in the perturbative expansion of the R -ratio of electron–positron annihilation

The equation of state with light clusters for nuclear and stellar matter is determined using chemical equilibrium constants evaluated from the analysis of the recently published (Xe + Sn) heavy ion data, corresponding to three reactions with different isotopic contents of the emission source. The measured multiplicities are used to extract the thermodynamic properties, and an in-medium correction to

Two-neutrino double electron capture is a process allowed in the standard model of particle physics. This rare decay has been observed in 78 Kr, 130 Ba and more recently in 124 Xe. In this publication we report on the search for this process in 124 Xe and 126 Xe using the full exposure of the large underground xenon (LUX) experiment, in a total of 27769.5 kg-days. No evidence of a signal was observed

The signal strength of the gg → H → γγ reaction in pp collisions at the Large Hadron Collider is studied within the context of the standard model with universal extra dimensions (UED). The impact of an arbitrary number n of UED on both the gg → H and H → γγ subprocesses is studied. The one-loop contribution of Kaluza–Klein excitations on these subprocesses are proportional to discrete and continuous

In spite of numerous scientific and practical applications, there is still no comprehensive theoretical description of the nuclear fission process based solely on protons, neutrons and their interactions. The most advanced simulations of fission are currently carried out within nuclear density functional theory ( DFT ). In spite of being fully quantum-mechanical and rooted in the theory of nuclear

We show how to produce antideuteron, antihelium, and other antinuclei in large fractions from the decays of a new particle ϕ that carries baryon number. Close to threshold, the production of nuclear bound states is preferred over the decay into individual nucleons, effectively decoupling antinuclei and antiproton fluxes and allowing the former to dominate, in clear contrast to antimatter production

Particles beyond the Standard Model (SM) can generically have lifetimes that are long compared to SM particles at the weak scale. When produced at experiments such as the Large Hadron Collider (LHC) at CERN, these long-lived particles (LLPs) can decay far from the interaction vertex of the primary proton–proton collision. Such LLP signatures are distinct from those of promptly decaying particles that

We study the nuclear matter properties like symmetry energy, slope parameter, curvature, skewness and incompressibility for hybrid EoS. The hybrid EoS is constructed by combining the hadron phase with the quark phase. For the hadron phase, we use the recently proposed effective-field-theory motivated relativistic mean-field model (E-RMF) with different parameter sets. For the quark phase, we employ

Charge trapping degrades the energy resolution of germanium (Ge) detectors, which require increased experimental sensitivity in searching for dark matter and neutrinoless double-beta decay. We investigate the charge trapping processes utilizing nine planar detectors fabricated from USD-grown crystals with well-known net impurity levels. The charge collection efficiency as a function of charge trapping

We describe a new method to solve coupled equations, that arises from the coupled-channel formalism applied to nuclear reactions involving the elastic and inelastic scattering processes. The new technique is faster and presents better numerical convergence than other usual methods. To illustrate the method, in the present paper we have analyzed data for the 4 He + 208 Pb system at E lab. = 120 and

The transverse momentum distribution of identified hadrons from recent years are analyzed within the thermodynamically consistent formulation of non-extensive statistics. A wide range of center-of-mass energies and average event multiplicities are studied for various hadron species. We demonstrate that the average event multiplicity is a key variable in the study of high-energy collisions and a smooth

The exotic nuclei are a fertile source of new features of nuclear structure. The evolution of new shell gaps accompanied by quenching of classical magic numbers is one of the marked features in these nuclei. These studies aimed to search and explore such behavior and find major significance on both the experimental and theoretical fronts. Here, we present an inclusive study and significant evidence

We explore the physics expected sensitivity at the Large Hadron electron Collider (LHeC) and the future circular collider-hadron electron (FCC-he) to search for the anomalous quartic WWγγ couplings in single W -boson production in association with a photon. We study the process ep → e − γ * p → eWγq ′ X via the subprocess γ * q → Wγq ′. The center-of-mass energies and luminosities of the LHeC are assumed

We investigate the impact of statistical uncertainties in the two-nucleon potentials on the neutron–deuteron elastic scattering and the deuteron breakup reaction observables at incoming nucleon kinetic energy up to 200 MeV. To that end we use the semi-phenomenological one-pion-exchange- Gaussian two-nucleon potential developed by the Granada group and the recent semi-local momentum-space regularized

We developed new parameterizations of local regularized finite-range pseudopotentials up to next-to-next-to-next-to-leading order (N 3 LO), used as generators of nuclear density functionals. When supplemented with zero-range spin–orbit and density-dependent terms, they provide a correct single-reference description of binding energies and radii of spherical and deformed nuclei. We compared the obtained

In a strong magnetic field, the hot dense quark matter is investigated in the Polyakov Nambu–Jona–Lasinio model. The value of a traced Polyakov loop is found as a nonmonotonous function of the chemical potential at lower magnetic fields and as a monotonous increasing function at high magnetic fields. The decreasing pseudocritical temperatures for the chiral restoration and the deconfinement crossover

A variant of QCD with the coupling suppressed in the infrared (IR) regime, as suggested by large-volume lattice calculations of the Landau gauge gluon and ghost dressing functions, is considered. The coupling is further restricted by the condition of approximate coincidence with perturbative QCD in the high momentum regime, and by the τ -lepton semihadronic decay rate in the intermediate momentum regime

High spin states in 127 I were populated via 124 Sn( 7 Li, 4n γ ) fusion-evaporation reaction at E beam = 33 MeV. Level scheme of 127 I has been updated by placing new γ -rays and also by confirming the spin/parity of several energy levels. Two new levels at E x = 2628 and 3199 keV have been identified which are found to decay into the negative parity πh 11/2 band. These two states and two earlier

In recent years, nuclear physics has benefited greatly from the development of powerful ab initio many-body methods and their combination with interactions from chiral effective field theory. With increasing computational power and continuous development of these methods, we are entering an era of precision nuclear physics. Indeed, uncertainties from nuclear Hamiltonians now dominate over uncertainties

In the present work we examine the possibility of detecting light dark matter particles in the few MeV region via their interactions with electrons. We analyze theoretically some key issues involved in such a detection and perform calculations for the expected rates, for electron recoils as well as spin induced atomic excitations, in the context of reasonable theoretical models.