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  • Search for vector-like T quark through th channel at eγ collider
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-26
    Liangliang Shang; Wei Wei; Bingfang Yang

    In an extension of the Standard Model with vector-like top partner, we investigate the vector-like top quark partner T via the channel e−γ→bνeT¯(→t¯h) at future linear collider. Due to the larger production rates than unpolarized beams, we calculate the production cross sections in polarized beams at s=2 and 3 TeV. We make a fast detector simulation for signal and background events and take a set of

    更新日期:2020-05-26
  • The two-mass contribution to the three-loop polarized gluonic operator matrix element Agg,Q(3)
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-25
    J. Ablinger; J. Blümlein; A. De Freitas; A. Goedicke; M. Saragnese; C. Schneider; K. Schönwald

    We compute the two-mass contributions to the polarized massive operator matrix element Agg,Q(3) at third order in the strong coupling constant αs in Quantum Chromodynamics analytically. These corrections are important ingredients for the matching relations in the variable flavor number scheme and for the calculation of Wilson coefficients in deep–inelastic scattering in the asymptotic regime Q2≫mc2

    更新日期:2020-05-25
  • TMD soft function from large-momentum effective theory
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-25
    Xiangdong Ji; Yizhuang Liu; Yu-Sheng Liu

    We study Euclidean formulations of the transverse-momentum-dependent (TMD) soft function, which is a cross section for soft gluon radiations involving color charges moving in two conjugate lightcone directions in quantum chromodynamics. We show it is related to a special form factor of a pair of color sources traveling with nearly-lightlike velocities, which can be matched to TMD physical observables

    更新日期:2020-05-25
  • Ising model as Wilson-Majorana Fermions
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-25
    Ulli Wolff

    We show the equivalence of the 2D Ising model to standard free Euclidean lattice fermions of the Wilson Majorana type. The equality of the loop representations for the partition functions of both systems is established exactly for finite lattices with well-defined boundary conditions. The honeycomb lattice is particularly simple in this context and therefore discussed first and only then followed by

    更新日期:2020-05-25
  • On the first-order phase transition in SU(N) matrix models
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-25
    M. Hnatič; G.A. Kalagov; M.Yu. Nalimov

    Phase transition in SU(N) symmetric models for the adjoint field φ in the case of arbitrary N is investigated. We examine the fluctuation-induced symmetry breaking from the point of view of the ferromagnetic phase transition in the large spin Fermi system, where the order parameter 〈φ〉 occurs discontinuously for N≥4. The free energies of the systems are analyzed within both ε-expansion and the functional

    更新日期:2020-05-25
  • A 96 GeV scalar tagged to dark matter models
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-22
    Anirban Kundu; Suvam Maharana; Poulami Mondal

    Recently, the CMS Collaboration observed the hint of a resonance decaying to two photons at about 96 GeV with a local significance of 2.8σ. While it is too early to say whether this will stand the test of time, such a resonance can easily be accommodated in many extensions of the Standard Model (SM). The more challenging part is to tune such an extension so that the required number of diphoton events

    更新日期:2020-05-22
  • Dipole subtraction vs. phase space slicing in NLO NRQCD heavy-quarkonium production calculations
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-21
    Mathias Butenschoen; Bernd A. Kniehl

    We compare two approaches to evaluate cross sections of heavy-quarkonium production at next-to-leading order in nonrelativistic QCD involving S- and P-wave Fock states: the customary approach based on phase space slicing and the approach based on dipole subtraction recently elaborated by us. We find reasonable agreement between the numerical results of the two implementations, but the dipole subtraction

    更新日期:2020-05-21
  • The O(α2) initial state QED corrections to e+e−→γ⁎/Z0⁎
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-20
    J. Blümlein; A. De Freitas; C.G. Raab; K. Schönwald

    We calculate the complete O(α2) initial state radiation corrections to e+e− annihilation into a neutral vector boson in a direct analytic computation without any approximation. The corrections are represented in terms of iterated incomplete (elliptic) integrals over alphabets of square-root valued letters. Performing the limit s≫me2, we find discrepancies with the earlier results of Ref. [1] and confirm

    更新日期:2020-05-20
  • Magnetic helicity in plasma of chiral fermions electroweakly interacting with inhomogeneous matter
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-19
    Maxim Dvornikov

    We study chiral fermions electroweakly interacting with a background matter having the nonuniform density and the velocity arbitrarily depending on coordinates. The dynamics of this system is described approximately by finding the Berry phase. The effective action and the kinetic equations for right and left particles are derived. In the case of a rotating matter, we obtain the correction to the anomalous

    更新日期:2020-05-19
  • Narain transform for spectral deformations of random matrix models
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-15
    M.A. Nowak; W. Tarnowski

    We start from applying the general idea of spectral projection (suggested by Olshanski and Borodin and advocated by Tao) to the complex Wishart model. Combining the ideas of spectral projection with the insights from quantum mechanics, we derive in an effortless way all spectral properties of the complex Wishart model: first, the Marcenko-Pastur distribution interpreted as a Bohr-Sommerfeld quantization

    更新日期:2020-05-15
  • Models of the universe based on Jordan algebras
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-15
    J. Ambjørn; Y. Watabiki

    We propose a model for the universe based on Jordan algebras. The action consists of cubic terms with coefficients being the structure constants of a Jordan algebra. Coupling constants only enter the theory via symmetry breaking which also selects a physical vacuum. “Before” the symmetry breaking the universe is in a pre-geometric state where it makes no sense to talk about space or time, but time

    更新日期:2020-05-15
  • Subleading logarithmic QED initial state corrections to e+e−→γ⁎/Z0⁎ to O(α6L5)
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-15
    J. Ablinger; J. Blümlein; A. De Freitas; K. Schönwald

    Using the method of massive operator matrix elements, we calculate the subleading QED initial state radiative corrections to the process e+e−→γ⁎/Z⁎ for the first three logarithmic contributions from O(α3L3),O(α3L2),O(α3L) to O(α5L5),O(α5L4),O(α5L3) and compare their effects to the leading contribution O(α6L6) and one more subleading term O(α6L5). The calculation is performed in the limit of large center

    更新日期:2020-05-15
  • Group manifolds and homogeneous spaces with HKT geometry: The role of automorphisms
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-14
    A.V. Smilga

    We present a new simple proof of the fact that certain group manifolds as well as certain homogeneous spaces G/H of dimension 4n admit a triple of integrable complex structures that satisfy the quaternionic algebra and are covariantly constant with respect to the same torsionful Bismut connection, i.e. exhibit the HKT geometry. The key observation is that different complex structures are interrelated

    更新日期:2020-05-14
  • String coherent vertex operators of Neveu-Schwarz and Ramond states
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-14
    Alice Aldi; Maurizio Firrotta

    We present a compact expression for a coherent vertex operator in superstring theory, in the Neveu-Schwarz sector, that can be easily extended to the Ramond sector by supersymmetric transformations in target space. We give also an explicit construction for the Ramond coherent vertex operator. These constructions provide the use of the supersymmetric version of the Del Giudice-Di Vecchia-Fubini operators

    更新日期:2020-05-14
  • Study of the radiative decay J/ψ → ηc + γ in light cone sum rules
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-14
    Song-Pei Guo; Yan-Jun Sun; Wei Hong; Qi Huang; Guo-Hua Zhao

    At present, there are many experimental and theoretical results for J/ψ→ηc+γ process, while the results are inconsistent based on different methods and considerations. In this paper, the light cone sum rules method is used in studying the radiative decay J/ψ→ηc+γ. We give the transition form factor of this process based on the leading twist distribution amplitude of ηc meson, with this form factor

    更新日期:2020-05-14
  • Fourth post-Newtonian Hamiltonian dynamics of two-body systems from an effective field theory approach
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-13
    J. Blümlein; A. Maier; P. Marquard; G. Schäfer

    We calculate the motion of binary mass systems in gravity up to the fourth post–Newtonian order. We use momentum expansions within an effective field theory approach based on Feynman amplitudes in harmonic coordinates by applying dimensional regularization. We construct the canonical transformations to ADM coordinates and to effective one body theory (EOB) to compare with other approaches. We show

    更新日期:2020-05-13
  • Charmed baryon decays in SU(3)F symmetry
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-11
    Cai-Ping Jia; Di Wang; Fu-Sheng Yu

    In the recent years, fruitful results on charmed baryons are obtained by BESIII, Belle and LHCb. We investigate the two-body non-leptonic decays of charmed baryons based on the exact flavor SU(3) symmetry without any other approximation. Hundreds of amplitude relations are clearly provided, and are classified according to the I-, U- and V-spin symmetries. Among them, some amplitude relations are tested

    更新日期:2020-05-11
  • Muon pair production via photon-induced scattering at the CLIC in models with extra dimensions
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-11
    S.C. İnan; A.V. Kisselev

    The photon-induced dimuon production e+e−→e+γγe−→e+μ+μ−e− at the CLIC is studied in the framework of three models with extra dimensions. The electron beam energies 750 GeV and 1500 GeV are considered. The total cross sections are calculated depending on the minimal transverse momenta of the final muons. The sensitivity bounds on the parameters of the models are obtained as functions of the CLIC integrated

    更新日期:2020-05-11
  • Mono-b events from single stop production at the HL-LHC and HE-LHC
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-08
    Tian-Peng Tang; Ning Liu; Hang Zhou

    Top-squarks (stop) play an important role in SUSY naturalness. The stop pair production is considered as the most effective way to search for stop at the LHC. However, the collider signature of stop pair production is usually characterized by tt¯ plus missing transverse energy, which is also predicted in many other non-supersymmetric models. On the other hand, the single stop production via the electroweak

    更新日期:2020-05-08
  • Corrigendum to “CP violation effects on the neutrino degeneracy parameters in the Early Universe” [Nucl. Phys. B 837 (2010) 50–60]
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-08
    Maria Cristina Volpe

    We correct for misleading statements in the text of the manuscript.

    更新日期:2020-05-08
  • Probes of holographic thermalization in a simple model with momentum relaxation
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-07
    Yong-Zhuang Li; Xiao-Mei Kuang

    From the viewpoint of AdS/CFT correspondence, we investigate the holographic thermalization process in a four dimensional Einstein-Maxwell-axions gravity theory, which is considered as a simple bulk theory dual to a boundary theory with momentum relaxation. We probe the thermalization process using the equal time two-point functions and the entanglement entropy with the circle profile. We analyze the

    更新日期:2020-05-07
  • Angular momentum of the electron: One-loop studies
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-06
    Bogdan Damski

    We combine bare perturbation theory with the imaginary time evolution technique to study one-loop radiative corrections to various components of angular momentum of the electron. Our investigations are based on the canonical decomposition of angular momentum, where spin and orbital components, associated with fermionic and electromagnetic degrees of freedom, are individually approached. We use for

    更新日期:2020-05-06
  • slˆ(n)N WZW conformal blocks from SU(N) instanton partition functions on C2/Zn
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-05
    Omar Foda; Nicholas Macleod; Masahide Manabe; Trevor Welsh

    Generalizations of the AGT correspondence between 4D N=2 SU(2) supersymmetric gauge theory on C2 with Ω-deformation and 2D Liouville conformal field theory include a correspondence between 4D N=2 SU(N) supersymmetric gauge theories, N=2,3,…, on C2/Zn, n=2,3,…, with Ω-deformation and 2D conformal field theories with WN,npara (n-th parafermion WN) symmetry and slˆ(n)N symmetry. In this work, we trivialize

    更新日期:2020-05-05
  • Model-independent sensitivity estimates for the electromagnetic dipole moments of the top quark at the Large Hadron Collider and beyond
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-05
    M. Koksal

    As the heaviest known fundamental particle, the top quark ensures testing of the Standard Model and occupies a significant role in a lot of theories of new physics beyond the Standard Model. Up to now, the top quark has been only generated at the Tevatron and the Large Hadron Collider. However, one of the most important tasks of the physics program at the Large Hadron Collider is the investigation

    更新日期:2020-05-05
  • Contribution of exclusive diffractive processes to the measured azimuthal asymmetries in SIDIS
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-05

    Hadron leptoproduction in Semi-Inclusive measurements of Deep-Inelastic Scattering (SIDIS) on unpolarised nucleons allows one to get information on the intrinsic transverse momentum of quarks in a nucleon and on the Boer-Mulders function through the measurement of azimuthal modulations in the cross section. These modulations were recently measured by the HERMES experiment at DESY on proton and deuteron

    更新日期:2020-05-05
  • Scaling behavior of crystalline membranes: An ε-expansion approach
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-05
    Achille Mauri; Mikhail I. Katsnelson

    We study the scaling behavior of two-dimensional (2D) crystalline membranes in the flat phase by a renormalization group (RG) method and an ε-expansion. Generalization of the problem to non-integer dimensions, necessary to control the ε-expansion, is achieved by dimensional continuation of a well-known effective theory describing out-of-plane fluctuations coupled to phonon-mediated interactions via

    更新日期:2020-05-05
  • NLO QCD corrections to gluon fragmentation function into ηb and ηc based on the Suzuki's model
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-05
    S. Mohammad Moosavi Nejad; Maryam Roknabady; Mahdi Delpasand

    In this work, we calculate the fragmentation function (FF) of gluon splitting into the quarkonium bound state at next-to-leading order perturbative QCD. To this end, we apply the well-established Suzuki's model which is convenient to consider the polarization states of produced quarkonium. To be specific, we restrict ourselves to the fragmentation of gluon into the S-wave pseudoscalar mesons ηc and

    更新日期:2020-05-05
  • Goldstone boson effects on vacuum decay
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-05-04
    Mulham Hijazi; Apostolos Pilaftsis

    We study the effects of Goldstone modes on the stability of the vacuum in a U(1) theory for a complex scalar field. The dynamics of the field resemble those of Keplerian motion in the presence of time-dependent friction, whose equations of motion imply a conserved quantity, L, reminiscent of conserved angular momentum. They also imply a persistent infinite barrier at ρ=0 and a divergent field value

    更新日期:2020-05-04
  • The phase space of k-Essence f(R) gravity theory
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-29
    V.K. Oikonomou; N. Chatzarakis

    Among the remaining viable theories that can successfully describe the late-time era is the k-Essence theory and in this work we study in detail the phase space of k-Essence f(R) gravity in vacuum. This theory can describe in a viable way the inflationary era too, so we shall study the phase space in detail, since this investigation may reveal general properties regarding the inflationary attractors

    更新日期:2020-04-29
  • Notes on superconformal representations in two dimensions
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-28
    Siyul Lee; Sungjay Lee

    We study global subalgebras of superconformal algebras in two dimensions and their unitary representations. Global superconformal multiplets are decomposed into conformal multiplets using Racah-Speiser algorithm, revealing many essential aspects of superconformal theories such as stress-energy tensor, conserved current, supersymmetric deformation and supersymmetry enhancement. Character formulae for

    更新日期:2020-04-28
  • Total probability and number of fermion production in external electric field and magnetic field in de Sitter universe
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-24
    Mihaela-Andreea Băloi; Diana Popescu; Cosmin Crucean

    In this paper we present a method for calculating the total probability corresponding to the processes of fermion pair production in dipole magnetic field and external Coulomb field in a de Sitter geometry. For that we rewrite the amplitudes in terms of oscillatory functions and we use the Taylor expansion of these functions for arriving at the final form of the momenta integrals. The total probability

    更新日期:2020-04-24
  • Spinorial structure of O(3) and application to dark matter
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-22
    Teruyuki Kitabayashi; Masaki Yasuè

    An O(3) spinor, Φ, as a doublet denoted by 2D consists of an SO(3) spinor, ϕ, and its complex conjugate, ϕ⁎, which form Φ=(ϕ,ϕ⁎)T to be identified with a Majorana-type spinor of O(4). The four gamma matrices Γμ (μ=1∼4) are given by Γi=diag.(τi,τi⁎) (i=1,2,3) and Γ4=−τ2⊗τ2, where τi denote the Pauli matrices. The rotations and axis-reflections of O(3) are, respectively, generated by Σij and Σi4, where

    更新日期:2020-04-22
  • New massless and massive infinite derivative gravity in three dimensions
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-21
    Anupam Mazumdar; Georg Stettinger

    In this paper we will consider the most general quadratic curvature action with infinitely many covariant derivatives of massless gravity in three spacetime dimensions. The action is parity invariant and torsion-free and contains the same off-shell degrees of freedom as the Einstein-Hilbert action in general relativity. In the ultraviolet, with an appropriate choice of the propagator given by the exponential

    更新日期:2020-04-21
  • Breaking of the tetra-maximal neutrino mixing pattern
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-21
    Newton Nath

    We make an attempt to study the present status of the tetra-maximal neutrino mixing (TMM) pattern. It predicts all the three leptonic mixing angles θ13≈8.4∘,θ12≈30.4∘, and θ23=45∘ together with the three CP-violating phases −δ=ρ=σ=90∘. However, the latest global analysis of neutrino oscillation data prefer relatively higher best-fit value of θ12 as well as non-maximal values of both θ23,δ. In order

    更新日期:2020-04-21
  • Nested algebraic Bethe ansatz for deformed orthogonal and symplectic spin chains
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-21
    Allan Gerrard; Vidas Regelskis

    We construct exact eigenvectors and eigenvalues for Uq(sp2n)- and Uq(so2n)-symmetric closed spin chains by means of a nested algebraic Bethe ansatz method. We use a fusion procedure to construct higher-dimensional Lax operators. Our approach generalises and extends the results obtained by Reshetikhin and De Vega–Karowski. We also present a generalisation of Tarasov–Varchenko trace formula for nested

    更新日期:2020-04-21
  • Wilson action for the O(N) model
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-20
    S. Dutta; B. Sathiapalan; H. Sonoda

    In this paper the fixed-point Wilson action for the critical O(N) model in D=4−ϵ dimensions is written down in the ϵ expansion to order ϵ2. It is obtained by solving the fixed-point Polchinski Exact Renormalization Group equation (with anomalous dimension) in powers of ϵ. This is an example of a theory that has scale and conformal invariance despite having a finite UV cutoff. The energy-momentum tensor

    更新日期:2020-04-20
  • Holographic variables for CFT2 conformal blocks with heavy operators
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-17
    Konstantin Alkalaev; Mikhail Pavlov

    We consider large-c n-point Virasoro blocks with n−k background heavy operators and k perturbative heavy operators. Conformal dimensions of heavy operators scale linearly with large c, while splitting into background/perturbative operators assumes an additional perturbative expansion. Such conformal blocks can be calculated within the monodromy method that basically reduces to solving auxiliary Fuchsian

    更新日期:2020-04-17
  • Three-loop verification of a new algorithm for the calculation of a β-function in supersymmetric theories regularized by higher derivatives for the case of N=1 SQED
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-17
    S.S. Aleshin; I.S. Durandina; D.S. Kolupaev; D.S. Korneev; M.D. Kuzmichev; N.P. Meshcheriakov; S.V. Novgorodtsev; I.A. Petrov; V.V. Shatalova; I.E. Shirokov; V.Yu. Shirokova; K.V. Stepanyantz

    We verify a recently proposed method for obtaining a β-function of N=1 supersymmetric gauge theories regularized by higher derivatives by an explicit calculation. According to this method, a β-function can be found by calculating specially modified vacuum supergraphs instead of a much larger number of the two-point superdiagrams. The result is produced in the form of a certain integral of double total

    更新日期:2020-04-17
  • Higher anomalies, higher symmetries, and cobordisms III: QCD matter phases anew
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-16
    Zheyan Wan; Juven Wang

    We explore QCD4 quark matter, the μ-T (chemical potential-temperature) phase diagram, possible 't Hooft anomalies, and topological terms, via non-perturbative tools of cobordism theory and higher anomaly matching. We focus on quarks in 3-color and 3-flavor on bi-fundamentals of SU(3), then analyze the continuous and discrete global symmetries and pay careful attention to finite group sectors. We input

    更新日期:2020-04-16
  • Topological string geometry
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-15
    Matsuo Sato; Yuji Sugimoto

    Perturbative string amplitudes are correctly derived from the string geometry theory, which is one of the candidates of a non-perturbative formulation of string theory. In order to derive non-perturbative effects rather easily, we formulate topological string geometry theory. We derive the perturbative partition function of the topological string theory from fluctuations around a classical solution

    更新日期:2020-04-15
  • Modeling holographic dark energy with particle and future horizons
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-15
    Miguel Cruz; Samuel Lepe

    In this work we explore some cosmological properties coming from the particle and future horizons when are considered as candidates to model the dark energy sector within a holographic context in a flat Friedmann-Lemaitre-Robertson-Walker universe; we focus on some thermodynamics characteristics of the resulting dark energy scenario. Within the interacting scheme for cosmological fluids we obtain that

    更新日期:2020-04-15
  • SO(5) Landau models and nested Nambu matrix geometry
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-14
    Kazuki Hasebe

    The SO(5) Landau model is the mathematical platform of the 4D quantum Hall effect and provide a rare opportunity for a physical realization of the fuzzy four-sphere. We present an integrated analysis of the SO(5) Landau models and the associated matrix geometries through the Landau level projection. With the SO(5) monopole harmonics, we explicitly derive matrix geometry of a four-sphere in any Landau

    更新日期:2020-04-14
  • The unequal mass sunrise integral expressed through iterated integrals on M‾1,3
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-12
    Christian Bogner; Stefan Müller-Stach; Stefan Weinzierl

    We solve the two-loop sunrise integral with unequal masses systematically to all orders in the dimensional regularisation parameter ε. In order to do so, we transform the system of differential equations for the master integrals to an ε-form. The sunrise integral with unequal masses depends on three kinematical variables. We perform a change of variables to standard coordinates on the moduli space

    更新日期:2020-04-12
  • Exclusive Z0 photoproduction at the Large Hadron Collider and the Future Circular Collider
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-10
    R.O. Coelho; V.P. Gonçalves

    In this paper we present a comprehensive analysis of the exclusive Z0 photoproduction in pp, pPb and PbPb collisions for the energies of the Large Hadron Collider (LHC) and of the proposed Future Circular Collider (FCC). The rapidity distributions and cross sections are estimated considering the color dipole formalism and different phenomenological models for the gluon saturation effects. Our results

    更新日期:2020-04-10
  • A non-static quantum inspired spacetime in f(R) gravity: Gravity's rainbow.
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-10
    Prabir Rudra

    In this note we explore a non-static spacetime in quantum regime in the background of f ( R ) gravity. The time dependent Vaidya metric which represents the spacetime of a radiating body like star is studied in an energy dependent gravity's rainbow, which is a UV completion of General Relativity. In our quest we have used gravitational collapse as the main tool. The focus is to probe the nature of

    更新日期:2020-04-10
  • B − L extension of the standard model with Q6 symmetry
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-10
    V.V. Vien

    We propose a renormalizable B−L Standard Model (SM) extension based on Q6 symmetry which accommodates fermion mass and mixing parameters. Both normal and inverted neutrino mass orderings, the smallness of the active neutrino masses are generated through type I seesaw mechanism. The obtained physical parameters are well consistent with the global fit of neutrino oscillation [1] while the quark masses

    更新日期:2020-04-10
  • Exploring the worldline formulation of the Potts model
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-04-09
    Christof Gattringer; Daniel Göschl; Pascal Törek

    We revisit the issue of worldline formulations for the q-state Potts model and discuss a worldline representation in arbitrary dimensions which also allows for magnetic terms. For vanishing magnetic field we implement a Hodge decomposition for resolving the constraints with dual variables, which in two dimensions implies self-duality as a simple corollary. We present exploratory 2-d Monte Carlo simulations

    更新日期:2020-04-09
  • Extending the geometry of heterotic spectral cover constructions
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-31
    Lara B. Anderson; Xin Gao; Mohsen Karkheiran

    In this work we extend the well-known spectral cover construction first developed by Friedman, Morgan, and Witten to describe more general vector bundles on elliptically fibered Calabi-Yau geometries. In particular, we consider the case in which the Calabi-Yau fibration is not in Weierstrass form, but can rather contain fibral divisors or multiple sections (i.e. a higher rank Mordell-Weil group). In

    更新日期:2020-03-31
  • Extended matter bounce scenario in ghost free f(R,G) gravity compatible with GW170817
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-05
    E. Elizalde; S.D. Odintsov; V.K. Oikonomou; Tanmoy Paul

    In the context of a ghost free f(R,G) model, an extended matter bounce scenario is studied where the form of the scale factor is given by a(t)=(a0t2+1)n. The ghost free character of the model is ensured by the presence of a Lagrange multiplier, as developed in [1]. The conditions under which, in this model, the speed of gravitational waves becomes equal to the speed of light (equal to one, in natural

    更新日期:2020-03-30
  • B − L violating nucleon decays as a probe of leptoquarks and implications for baryogenesis
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-05
    Chandan Hati; Utpal Sarkar

    We study the effective B−L violating couplings for scalar and vector leptoquarks which can naturally induce dimension seven B−L violating operators leading to very interesting nucleon decay modes such as n→e−π+,e−K+,μ−π+,μ−K+ and p→νπ+. This opens a new window to probe the nature and couplings of the scalar and vector leptoquarks in an ultraviolet model independent way which can provide an orthogonal

    更新日期:2020-03-30
  • Alternative renormalizable SO(10) GUTs and data fitting
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-12
    Takeshi Fukuyama; Nobuchika Okada; Hieu Minh Tran

    The alternative renormalizable minimal SO(10) model is composed of the Yukawa couplings with 10⊕120 Higgs fields, whereas the right-handed (RH) neutrino Majorana masses are generated via the Witten mechanism. The gauge coupling unification is achieved together with a unique pattern of the fermion masses and mixing at the grand unification scale due to additional contributions of vector-like quarks

    更新日期:2020-03-30
  • A comparative study of 0νββ decay in symmetric and asymmetric left-right model
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-26
    Supriya Senapati; Chayan Majumdar; Prativa Pritimita; Sudhanwa Patra

    We study the new physics contributions to neutrinoless double beta decay (0νββ) in a TeV scale left-right model with spontaneous D-parity breaking mechanism where the values of the SU(2)L and SU(2)R gauge couplings, gL and gR are unequal. Neutrino mass is generated in the model via gauge extended inverse seesaw mechanism. We embed the model in a non-supersymmetric SO(10) GUT with a purpose of quantifying

    更新日期:2020-03-30
  • Heterotic − type I dual pairs, rigid branes and broken SUSY
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-02
    Carlo Angelantonj; Hervé Partouche; Gianfranco Pradisi

    The moduli space of toroidal type I vacua, which are consistent at the non-perturbative level, is composed of independent branches characterized by the number (0, 16 or 32) of rigid branes sitting on top of orientifold planes. This structure persists also when supersymmetry is spontaneously broken à la Scherk–Schwarz. We show that all the components of the moduli space in dimension D≥5 indeed admit

    更新日期:2020-03-30
  • Photon orbits and phase transitions in Born-Infeld-dilaton black holes
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-02-28
    Haitang Li; Yong Chen; Shao-Jun Zhang

    Relations between photon orbits and thermodynamical phase transitions are explored in Born-Infeld-dilaton-AdS black hole (BH). The coupling between the electromagnetic field and the dialton field is chosen such that the full phase diagram contains zeroth-order and first-order phase transitions as well as reentrant phase transition (RPT). We find that there exist non-monotonic beahviors of the photon

    更新日期:2020-03-30
  • Mirrors and field sources in a Lorentz-violating scalar field theory
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-02-28
    L.H.C. Borges; A.F. Ferrari; F.A. Barone

    In this paper we consider classical effects in a model for a scalar field incorporating Lorentz symmetry breaking due to the presence of a single background vector vμ coupled to its derivative. We investigate of the interaction energy between stationary steady sources concentrated along parallel branes with an arbitrary number of dimensions, and derive from this study some physical consequences. For

    更新日期:2020-03-30
  • Study of gravastars under f(T) gravity
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-09
    Amit Das; Shounak Ghosh; Debabrata Deb; Farook Rahaman; Saibal Ray

    In the present paper, we propose a stellar model under the f(T) gravity following the conjecture of Mazur-Mottola [1], [2] known in literature as gravastar, a viable alternative to the black hole. This gravastar has three different regions, viz., (A) Interior core region, (B) Intermediate thin shell, and (C) Exterior spherical region. It is assumed that in the interior region the fluid pressure is

    更新日期:2020-03-30
  • Lax pairs for string Newton Cartan geometry
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-10
    Dibakar Roychowdhury

    In this paper, based on a systematic formulation of Lax pairs, we show classical integrability for nonrelativistic strings propagating over stringy Newton-Cartan (NC) geometry. We further construct the corresponding monodromy matrix which leads to an infinite tower of non-local conserved charges over stringy NC background.

    更新日期:2020-03-30
  • Scalaron-Higgs inflation
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-13
    Anirudh Gundhi; Christian F. Steinwachs

    In scalaron-Higgs inflation the Standard Model Higgs boson is non-minimally coupled to gravity and the Einstein-Hilbert action is supplemented by the quadratic scalar curvature invariant. For the quartic Higgs self-coupling λ fixed at the electroweak scale, we find that the resulting inflationary two-field model effectively reduces to a single field model with the same predictions as in Higgs inflation

    更新日期:2020-03-30
  • Non-relativistic reduction of spinors, new currents and their algebra
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-18
    Rabin Banerjee; Debashis Chatterjee

    A specific mapping is introduced to reduce the Dirac action to the non-relativistic (Pauli - Schrödinger) action for spinors. Using this mapping, the structures of the vector and axial vector currents in the non-relativistic theory are obtained. The implications of the relativistic Ward identities in the non-relativistic limit are discussed. A new non-abelian type of current in the Pauli - Schrödinger

    更新日期:2020-03-30
  • Low-energy 6D, N=(1,1) SYM effective action beyond the leading approximation
    Nucl. Phys. B (IF 3.185) Pub Date : 2020-03-18
    I.L. Buchbinder; E.A. Ivanov; B.S. Merzlikin

    For 6D, N=(1,1) SYM theory formulated in N=(1,0) harmonic superspace as a theory of interacting gauge multiplet and hypermultiplet we construct the N=(1,1) supersymmetric Heisenberg-Euler-type superfield effective action. The effective action is computed for the slowly varying on-shell background fields and involves, in the bosonic sector, all powers of a constant abelian strength.

    更新日期:2020-03-30
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