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  • Power meets Precision to explore the Symmetric Higgs Portal
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-30
    Christoph Englert; Joerg Jaeckel; Michael Spannowsky; Panagiotis Stylianou

    We perform a comprehensive study of collider aspects of a Higgs portal scenario that is protected by an unbroken Z2 symmetry. If the mass of the Higgs portal scalar is larger than half the Higgs mass, this scenario becomes very difficult to detect. We provide a detailed investigation of the model's parameter space based on analyses of the direct collider sensitivity at the LHC as well as at future

    更新日期:2020-05-30
  • Quantum Statistics and Spacetime Surgery
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-29
    Juven Wang; Xiao-Gang Wen; Shing-Tung Yau

    It is known that quantum statistics of quasiparticles in 2+1 spacetime dimensions beget anyons, beyond the familiar statistics of bosons and fermions, while Verlinde formula dictates the consistent anyon statistics. In 3+1 dimensions, although quasiparticles cannot be anyonic, extended quasi-excitations like strings can have anyonic string statistics. In this work, we first introduce the fusion and

    更新日期:2020-05-29
  • Poisson-Lie T-duality in Double Field Theory
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-29
    Falk Hassler

    We present a formulation of Double Field Theory with a Drinfeld double as extended spacetime. It makes Poisson-Lie T-duality (including abelian and non-abelian T-duality as special cases) manifest. This extends the scope of possible applications of the theory, which so far captured abelian T-duality only, considerably. The full massless bosonic subsector (NS/NS and R/R) of type II string theories is

    更新日期:2020-05-29
  • Quantum Correction of the Wilson Line and Entanglement Entropy in the Pure AdS3 Einstein Gravity Theory
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-29
    Xing Huang; Chen-Te Ma; Hongfei Shu

    We calculate the expectation value of the Wilson line in the pure AdS3 Einstein gravity theory and also the entanglement entropy in the boundary theory. Our one-loop calculation of entanglement entropy shows a shift of the central charge 26. Finally, we show that the Wilson line provides the equivalent description to the boundary entanglement entropy. This equivalence leads to a concrete example of

    更新日期:2020-05-29
  • Stellar structures in f(G) gravity admitting Noether symmetries
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-29
    M. Farasat Shamir; Tayyaba Naz

    This work aims to investigate some possible emergence of relativistic compact stellar objects in modified f(G) gravity using Noether symmetry approach. For this purpose, we assume static spherically symmetric spacetime in the presence of isotropic matter distribution. We construct Noether symmetry generators along with associated conserved quantities by considering the standard choice of viable f(G)

    更新日期:2020-05-29
  • Equivalence between first-order causal and stable hydrodynamics and Israel-Stewart theory for boost-invariant systems with a constant relaxation time
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-29
    Arpan Das; Wojciech Florkowski; Jorge Noronha; Radoslaw Ryblewski

    We show that the recently formulated causal and stable first-order hydrodynamics has the same dynamics as Israel-Stewart theory for boost-invariant, Bjorken expanding systems with an ideal gas equation of state and a regulating sector determined by a constant relaxation time. In this case, the general solution of the new first-order formulation can be determined analytically.

    更新日期:2020-05-29
  • New magicity N = 32 and 34 due to strong couplings between Dirac inversion partners
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-28
    Jia Liu; Yi Fei Niu; Wen Hui Long

    The novel nuclear structure in neutron-rich nuclei — the new magicity N=32 and 34 has been confirmed by the intensive experiment measurements (F. Wienholtz et al. (2013) [17]; D. Steppenbeck et al. (2013) [22]; S. Michimasa et al. (2018) [28]; etc.). However, the underlying mechanism of the new magicity is still under discussion. In this letter, we present a new mechanism that the strong couplings

    更新日期:2020-05-28
  • Multiplicity dependence of K*(892)0 and ϕ(1020) production in pp collisions at s=13 TeV
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-28

    The striking similarities that have been observed between high-multiplicity proton-proton (pp) collisions and heavy-ion collisions can be explored through multiplicity-differential measurements of identified hadrons in pp collisions. With these measurements, it is possible to study mechanisms such as collective flow that determine the shapes of hadron transverse momentum (pT) spectra, to search for

    更新日期:2020-05-28
  • Symmetry energy of super-dense neutron-rich matter from integrating barotropic pressures in neutron stars and heavy-ion reactions
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-27
    Bao-An Li; Wen-Jie Xie

    Within the minimum model of neutron stars (NS) consisting of neutrons, protons and electrons, a new approach is proposed for inferring the symmetry energy of super-dense neutron-rich nucleonic matter above twice the saturation density ρ0 of nuclear matter directly from integrating iteratively barotropic pressures in both neutron stars and heavy-ion reactions. Simultaneously, the proton fraction of

    更新日期:2020-05-27
  • Wilson lines in AdS/dCFT
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-26
    Sara Bonansea; Khalil Idiab; Charlotte Kristjansen; Matthias Volk

    We consider the expectation value of Wilson lines in two defect versions of N=4 SYM, both with supersymmetry completely broken, where one is described in terms of an integrable boundary state, the other one not. For both cases, imposing a certain double scaling limit, we find agreement to two leading orders between the expectation values calculated from respectively the field theory- and the string

    更新日期:2020-05-26
  • Relaxation rate of RNdS black hole
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-26
    Ming Zhang; Jie Jiang; Zhen Zhong

    We investigate the relaxation rate of the RNdS black hole perturbed by neutral massless scalar field in the eikonal limit. We find that the fastest relaxation rate of the composed system increases with the cosmological constant for all spacetime dimensions. We also find that, when the cosmological constant decreases from maximum value to zero, the corresponding critical charge of the four-dimensional

    更新日期:2020-05-26
  • Rapidity-dependent eccentricity scaling in relativistic heavy-ion collisions
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-25
    Rodrigo Franco; Matthew Luzum

    There is a well-established relation between the spatial asymmetry in the initial stage of a heavy-ion collision and the final momentum anisotropy, which allows for a separation of effects from initial conditions vs. later evolution and has proved exceptionally powerful. However, until recently it has only been studied in two dimensions — either through boost-invariant simulations or studying only

    更新日期:2020-05-25
  • Production of axionlike particles in PbPb collisions at the LHC, HE–LHC and FCC: A phenomenological analysis
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-22
    R.O. Coelho; V.P. Gonçalves; D.E. Martins; M.S. Rangel

    The production of axionlike particles (ALP) in ultraperipheral PbPb collisions (UPHIC) is investigated considering the energies of the next run of the Large Hadron Collider (LHC) and of the future High Energy–LHC (HE–LHC) and Future Circular Collider (FCC). Assuming four different combinations for the ALP mass and coupling and the typical exclusivity cuts for central and forward detectors, we estimate

    更新日期:2020-05-22
  • Saturation corrections to dilute-dense particle production and azimuthal correlations in the Color Glass Condensate
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-22
    S. Schlichting; V. Skokov

    We perform a numerical study of higher order saturation corrections to the dilute-dense approximation for multi-particle production in high-energy hadronic collisions in the framework of the Color Glass Condensate. We compare semi-analytical results obtained by performing a leading order expansion in the dilute field of the projectile with numerical simulations of the full Classical Yang-Mills dynamics

    更新日期:2020-05-22
  • Search for disappearing tracks in proton-proton collisions at s=13TeV
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-22

    A search is presented for long-lived charged particles that decay within the volume of the silicon tracker of the CMS experiment. Such particles can produce events with an isolated track that is missing hits in the outermost layers of the silicon tracker, and is also associated with little energy deposited in the calorimeters and no hits in the muon detectors. The search for events with this “disappearing

    更新日期:2020-05-22
  • Exact WKB analysis and TBA equations for the Mathieu equation
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-21
    Keita Imaizumi

    We derive the Thermodynamic Bethe Ansatz (TBA) equations for the exact WKB periods of the Mathieu equation in the weak coupling region. We will use the TBA equations to calculate the quantum corrections to the WKB periods, which are regarded as the quantum periods of N=2 SU(2) super Yang-Mills theory at strong coupling. We calculate the effective central charge of the TBA equations, which is found

    更新日期:2020-05-21
  • CP asymmetry from hadronic charm rescattering in B± → π−π+π± decays at the high mass region
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-21
    I. Bediaga; T. Frederico; P.C. Magalhães

    A model for the B±→π−π+π± decay amplitude is proposed to study the large CP violation observed at the high mass region of the Dalitz plane. A short distance b→u amplitude with the weak phase γ is considered together with the contribution of a hadronic charm loop and a s-wave DD¯→ππ rescattering. In the model, the χc0 appears as a narrow resonant state of the DD¯ system below threshold. It is introduced

    更新日期:2020-05-21
  • Emergence of Gauss' law in a Z2 lattice gauge theory in 1 + 1 dimensions
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-21
    Jernej Frank; Emilie Huffman; Shailesh Chandrasekharan

    We explore a Z2 Hamiltonian lattice gauge theory in one spatial dimension with a coupling h, without imposing any Gauss' law constraint. We show that in our model h=0 is a free deconfined quantum critical point containing massless fermions where all Gauss' law sectors are equivalent. The coupling h is a relevant perturbation of this critical point and fermions become massive due to confinement and

    更新日期:2020-05-21
  • Sliding surface charges on AdS3
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-21
    H. Adami; V. Hosseinzadeh; M.M. Sheikh-Jabbari

    We consider Einstein gravity on a patch of AdS3 spacetime between two radii r1,r2. We compute surface charges and their algebra at an arbitrary radius r such that it reduces to a given set of surface charges at r1,r2. The r-dependent charges become integrable upon addition of an appropriate boundary Y-term. We observe that soft excitations at each boundary are independent of those at the other boundary

    更新日期:2020-05-21
  • Inverse seesaw accompanied by Dirac fermionic dark matter
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-20
    Pei-Hong Gu

    We present an inverse seesaw mechanism by resorting to a U(1)B−L gauge symmetry. In order to cancel the gauge anomalies, we introduce nine neutral fermions among which six participate in the inverse seesaw, while the other three form a Dirac fermion and a massless fermion. In this inverse seesaw, three neutral fermions are the usual right-handed neutrinos while the other three have a small Majorana

    更新日期:2020-05-20
  • Photoproduction of massive gauge bosons in pp, pPb and PbPb collisions
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-20
    R.O. Coelho; V.P. Gonçalves

    In this letter we present, for the first time, the results for the photoproduction of massive gauge bosons in proton – proton, proton – Lead and Lead – Lead collisions at the Large Hadron Collider (LHC), High – Energy LHC (HE – LHC) and Future Circular Collider (FCC). Predictions for the rapidity distributions and total cross sections are presented. We predict a large number of events in the rapidity

    更新日期:2020-05-20
  • ϒ production in p–Pb collisions at sNN=8.16 TeV
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-20

    ϒ production in p–Pb interactions is studied at the centre-of-mass energy per nucleon–nucleon collision sNN=8.16 TeV with the ALICE detector at the CERN LHC. The measurement is performed reconstructing bottomonium resonances via their dimuon decay channel, in the centre-of-mass rapidity intervals 2.03

    更新日期:2020-05-20
  • Staccato radiation from the decay of large amplitude oscillons
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-20
    Patrick Dorey; Tomasz Romańczukiewicz; Yakov Shnir

    We study the decay of large amplitude, almost periodic breather-like states in a deformed sine-Gordon model in one spatial dimension. We discover that these objects decay in a staggered fashion via a series of transitions, during which higher harmonics are released as short, staccato bursts of radiation. Further, we argue that this phenomenon is not restricted to one particular model, and that similar

    更新日期:2020-05-20
  • Search for bbb¯b¯ tetraquark decays in 4 muons, B+B−, B0B¯0 and Bs0B¯s0 channels at LHC
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-19
    C. Becchi; A. Giachino; L. Maiani; E. Santopinto

    We perform a quantitative analysis of the bbb¯b¯ tetraquark decays into hidden- and open-bottom mesons and calculate, for the first time, the bbb¯b¯ tetraquark total decay width. On the basis of our results, we propose the bbb¯b¯→B+B−(B0B¯0)(Bs0B¯s0)→l+l−+X decays as the most suitable channels to observe the bbb¯b¯ tetraquark states, since the calculated two-lepton cross section upper limit, ≃39 fb

    更新日期:2020-05-19
  • Dual separated variables and scalar products
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-19
    Nikolay Gromov; Fedor Levkovich-Maslyuk; Paul Ryan; Dmytro Volin

    Separation of variables (SoV) is an extremely efficient and elegant technique for analysing physical systems but its application to integrable spin chains was limited until recently to the simplest su(2) cases. In this paper we continue developing the SoV program for higher-rank spin chains and demonstrate how to derive the measure for the su(3) case. Our results are a natural consequence of factorisability

    更新日期:2020-05-19
  • Einstein-Maxwell-scalar black holes: The hot, the cold and the bald
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-18
    Jose Luis Blázquez-Salcedo; Carlos A.R. Herdeiro; Jutta Kunz; Alexandre M. Pombo; Eugen Radu

    The phenomenon of spontaneous scalarisation of charged black holes (BHs) has recently motivated studies of various Einstein-Maxwell-scalar models. Within these models, different classes of BH solutions are possible, depending on the non-minimal coupling function f(ϕ), between the scalar field and the Maxwell invariant. Here we consider the class wherein both the (bald) electrovacuum Reissner-Nordström

    更新日期:2020-05-18
  • Δ(27) framework for cobimaximal neutrino mixing models
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-16
    A.E. Cárcamo Hernández; I. de Medeiros Varzielas

    We propose a simple framework based on Δ(27) that leads to the successful cobimaximal lepton mixing ansatz, thus providing a predictive explanation for leptonic mixing observables. We explore first the effective neutrino mass operators, then present a specific model realization based on type I seesaw, and also propose a model with radiative 1-loop seesaw which features viable dark matter candidates

    更新日期:2020-05-16
  • Central exclusive χc,b production at high energy colliders and gluon saturation approach
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-15
    F. Kopp; M.B. Gay Ducati; M.V.T. Machado

    The central exclusive production of χc and χb at the LHC, RHIC and Tevatron energies is analyzed, using the recent unintegrated parton distribution (UGDs) functions available in the package TMDlib. Comparison with data is performed, which tests the underlying assumptions basing the theoretical approach and it can constrain the unintegrated gluon distribution function at the small-x region. Predictions

    更新日期:2020-05-15
  • Population of a low-spin positive-parity band from high-spin intruder states in 177Au: The two-state mixing effect
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-14
    M. Venhart; M. Balogh; A. Herzáň; J.L. Wood; F.A. Ali; D.T. Joss; A.N. Andreyev; K. Auranen; R.J. Carroll; M.C. Drummond; J.L. Easton; P.T. Greenlees; T. Grahn; A. Gredley; J. Henderson; U. Jakobsson; R. Julin; S. Juutinen; F.P. Wearing

    The extremely neutron-deficient isotopes 177,179Au were studied by means of in-beam γ-ray spectroscopy. Specific tagging techniques, α-decay tagging in 177Au and isomer tagging in 179Au, were used for these studies. Feeding of positive-parity, nearly spherical states, which are associated with 2d3/2 and 3s1/2 proton-hole configurations, from the 1i13/2 proton-intruder configuration was observed in

    更新日期:2020-05-14
  • Nuclear level density of 69Zn from gamma gated particle spectrum and its implication on 68Zn(n, γ)69Zn capture cross section
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-14
    Rajkumar Santra; Balaram Dey; Subinit Roy; Md.S.R. Laskar; R. Palit; H. Pai; S. Rajbanshi; Sajad Ali; Saikat Bhattacharjee; F.S. Babra; Anjali Mukherjee; S. Jadhav; Balaji S. Naidu; Abraham T. Vazhappilly; Sanjoy Pal

    Evaporated α-spectra have been measured in coincidence with low energy discrete γ-rays from residual nucleus 68Zn populated by αn evaporation from compound nucleus 73Ge produced in the reaction 64Ni(9Be,αn)68Zn at E(9Be) = 30 MeV. Low energy γ-gated α-particle spectra, for the first time, have been used to extract the nuclear level density (NLD) for the intermediate 69Zn nucleus in the excitation energy

    更新日期:2020-05-14
  • Coexistence of planar and aplanar rotations in 195Tl
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-14
    J. Peng; Q.B. Chen

    The chirality suggested for the doublet bands B2 and B2a in 195Tl in A∼190 region is reexamined. The potential-energy curves and the configurations together with the deformation parameters are obtained by the constrained covariant density functional theory. The corresponding experimental energy spectra, energy differences between doublet bands, and the available B(M1)/B(E2) values are investigated

    更新日期:2020-05-14
  • Removing the Wigner bound in non-perturbative effective field theory
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-14
    Saar Beck; Betzalel Bazak; Nir Barnea

    The Wigner bound, setting an upper limit on the scattering effective range, is examined at different orders of contact effective field theory. Using cutoff regulator we show that the bound loosens when higher orders of the theory are considered. For a sharp and Gaussian regulators, we conjecture an analytic formula for the dependence of the Wigner bound on the theory's order. It follows that the bound

    更新日期:2020-05-14
  • Non-perturbative contributions to vector-boson transverse momentum spectra in hadronic collisions
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-13
    Francesco Hautmann; Ignazio Scimemi; Alexey Vladimirov

    Experimental measurements of Drell-Yan (DY) vector-boson production are available from the Large Hadron Collider (LHC) and from lower-energy collider and fixed-target experiments. In the region of low vector-boson transverse momenta qT, which is important for the extraction of the W-boson mass at the LHC, QCD contributions from non-perturbative Sudakov form factors and intrinsic transverse momentum

    更新日期:2020-05-13
  • Interplay between exact μ − τ reflection symmetries, four-zero texture and universal texture
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-13
    Masaki J.S. Yang

    In this letter, we consider exact μ−τ reflection symmetries for quarks and leptons. Fermion mass matrices are assumed to be four-zero textures for charged fermions f=u,d,e and a symmetric matrix for neutrinos νL. By a bi-maximal transformation, all the mass matrices lead to μ−τ reflection symmetric forms, which separately satisfy Tumu,ν⁎Tu=mu,ν and Tdmd,e⁎Td=md,e. Reconciliation between the μ−τ reflection

    更新日期:2020-05-13
  • Strings, symmetric products, TT¯ deformations and Hecke operators
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-13
    Akikazu Hashimoto; David Kutasov

    We derive a formula for the torus partition sum of the symmetric product of TT¯ deformed CFT's, using previous work on long strings in (deformed) AdS3, and universality. The result is given by an integral transform of the partition function for the block of the symmetric product, summed over its Hecke transforms, and is manifestly modular invariant. The spectrum is interpretable as a gas of multiply

    更新日期:2020-05-13
  • The electromagnetic field effects in in-out and in-in formalisms
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-12
    Gaoqing Cao

    In this work, we compare the effects of electromagnetic (EM) fields on strong coupling systems in two formalisms: in-out and in-in, which are different from each other when a finite electric field is present. The chiral effective Nambu–Jona-Lasinio model is adopted for this study, and two kinds of EM field distributions are considered: pure electric field and parallel EM (PEM) field with equal electric

    更新日期:2020-05-12
  • Monopole solutions in SU(2) Yang-Mills-plus-massive-nonlinear-spinor-field theory
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-12
    Vladimir Dzhunushaliev; Vladimir Folomeev; Albina Serikbolova

    Monopole solutions in SU(2) Yang-Mills theory which includes spinor fields described by the nonlinear Dirac equation are obtained. It is demonstrated that the energy spectrum of such a system possesses a global minimum whose appearance is brought about solely by the nonlinear spinor fields. It is shown that the monopole solution obtained differs in principle from the 't Hooft-Polyakov monopole in that

    更新日期:2020-05-12
  • Hydrodynamic attractors for Gubser flow
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-12
    Ashutosh Dash; Victor Roy

    The Boltzmann equation is solved in the relaxation time approximation using a hierarchy of angular moments of the distribution function. Our solution is obtained for an azimuthally symmetric radially expanding boost-invariant conformal system that is undergoing Gubser flow. The solution of moments that we get after truncating the infinite set of equations at various orders is compared to the exact

    更新日期:2020-05-12
  • Precise αs determination from charmonium sum rules
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-12
    Diogo Boito; Vicent Mateu

    The strong coupling, αs, governs perturbative Quantum Chromodynamics (QCD) and is one of the free parameters of the Standard Model. We introduce a new method that allows a precise extraction of αs(mZ) from dimensionless ratios of roots of moments of the charm-quark vector correlator. The ratios we use in our analysis have a rather weak logarithmic quark-mass dependence, starting at O(αs2), and can

    更新日期:2020-05-12
  • Asymptotic stability analysis for SU(n) dark monopoles
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-11
    M.L. Deglmann; Marco A.C. Kneipp

    We analyze the asymptotic stability of the SU(n) Dark Monopole solutions and we show that there are unstable modes associated with them. We obtain the explicit form of the unstable perturbations and the associated negative-squared eigenfrequencies.

    更新日期:2020-05-11
  • Study on a holographic static transverse polarization at non-zero temperature
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-11
    Lei Yin; Jialin Gao

    The analytical structure of a static transverse component of polarization tensor in complex momentum plane is numerically studied, which is holographically determined by a Einstein-Maxwell theory in asymptotically D=3+1 dimensional Anti-de Sitter spacetime. This strongly-coupled transverse polarization shows a pair of conjugate simple poles on the imaginary-axis at low temperature, which is different

    更新日期:2020-05-11
  • Pairing-quadrupole interplay in the neutron-deficient tin nuclei: First lifetime measurements of low-lying states in 106,108Sn
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-11
    M. Siciliano; J.J. Valiente-Dobón; A. Goasduff; F. Nowacki; A.P. Zuker; D. Bazzacco; A. Lopez-Martens; E. Clément; G. Benzoni; T. Braunroth; F.C.L. Crespi; N. Cieplicka-Oryńczak; M. Doncel; S. Ertürk; G. de France; C. Fransen; A. Gadea; G. Georgiev; Ch. Theisen

    The lifetimes of the low-lying excited states 2+ and 4+ have been directly measured in the neutron-deficient 106,108Sn isotopes. The nuclei were populated via a deep-inelastic reaction and the lifetime measurement was performed employing a differential plunger device. The emitted γ rays were detected by the AGATA array, while the reaction products were uniquely identified by the VAMOS++ magnetic spectrometer

    更新日期:2020-05-11
  • Production of f0(980) meson at the LHC: Color evaporation versus color-singlet gluon-gluon fusion
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-11
    Piotr Lebiedowicz; Rafał Maciuła; Antoni Szczurek

    The production of the f0(980) meson at high energies is not well understood. We investigate two different potential mechanisms for inclusive scalar meson production in the kt-factorization approach: color-singlet gluon-gluon fusion and color evaporation model. The γ⁎γ⁎→f0(980) form factor(s) can be constraint from the f0(980) radiative decay width. The g⁎g⁎→f0(980) form factors are obtained by a replacement

    更新日期:2020-05-11
  • Constraining the top quark effective field theory using the top quark pair production in association with a jet at future lepton colliders
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-11
    Reza Jafari; Parvin Eslami; Mojtaba Mohammadi Najafabadi; Hamzeh Khanpour

    Our main aim in this paper is to constrain the effective field theory describing the top quark couplings through the e−e+→tt¯ + jet process. The analysis is carried out considering two different center-of-mass energies of 500 and 3000 GeV including a realistic simulation of the detector response and the main sources of background processes. The expected limits at 95% CL are derived on the new physics

    更新日期:2020-05-11
  • A d = 3 dimensional model with two U(1) gauge fields coupled via matter fields and BF interaction
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-11
    A. Rapoport; F.A. Schaposnik

    We study a model in d=2+1 space-time dimensions with two sectors. One of them, which can be considered as the visible sector, contains just a U(1) gauge field which acts as a probe for the other (hidden) sector, given by a second U(1) gauge field and massive scalar and Dirac fermions. Covariant derivatives of these matter fields and a BF gauge mixing term couple the two sectors. Integration over fermion

    更新日期:2020-05-11
  • Extraction of gluon distributions from structure functions at small x in holographic QCD
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-08
    Akira Watanabe; Takahiro Sawada; Mei Huang

    We investigate the nucleon and pion gluon distribution functions in the framework of holographic QCD, focusing on the small Bjorken x region. Based on an approximate relation, the gluon distributions are extracted from structure functions of the unpolarized deep inelastic scattering which can be calculated with a holographic QCD model, assuming the Pomeron exchange. All the adjustable parameters of

    更新日期:2020-05-08
  • Determination of hexadecapole (β4) deformation of the light-mass nucleus 24Mg using quasi-elastic scattering measurements
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-08
    Y.K. Gupta; B.K. Nayak; U. Garg; K. Hagino; K.B. Howard; N. Sensharma; M. Şenyiğit; W.P. Tan; P.D. O'Malley; M. Smith; Ramandeep Gandhi; T. Anderson; R.J. deBoer; B. Frentz; A. Gyurjinyan; O. Hall; M.R. Hall; J. Hu; B. Vande Kolk

    Quasi-elastic scattering measurements have been performed using 16O and 24Mg projectiles off 90Zr at energies around the Coulomb barrier. Experimental data have been analyzed in the framework of coupled channels (CC) calculations using the code CCFULL. The quasi-elastic scattering excitation function and derived barrier distribution for 16O + 90Zr reaction are well reproduced by the CC calculations

    更新日期:2020-05-08
  • Charged black holes in AdS spaces in 4D Einstein Gauss-Bonnet gravity
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-07
    Pedro G.S. Fernandes

    Recently a non-trivial 4-dimensional theory of gravity that claims to circumvent Lovelock's theorem and avoid Ostrogradsky instability was formulated in Glavan and Lin (2020) [1]. This theory, named “4D Einstein Gauss-Bonnet gravity”, presents several novel predictions for cosmology and black hole physics. In this paper, we generalize the vacuum black hole solution of Glavan & Lin to include electric

    更新日期:2020-05-07
  • Zb tetraquark channel from lattice QCD and Born-Oppenheimer approximation
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-07
    S. Prelovsek; H. Bahtiyar; J. Petković

    Two Zb hadrons with exotic quark structure b¯bd¯u were discovered by Belle experiment. We present a lattice QCD study of the b¯bd¯u system in the approximation of static b quarks, where the total spin of heavy quarks is fixed to one. The energies of eigenstates are determined as a function of the separation r between b and b¯. The lower eigenstates are related to a bottomonium and a pion. The eigenstate

    更新日期:2020-05-07
  • Charm and beauty isolation from heavy flavor decay electrons in Au+Au collisions at sNN = 200 GeV at RHIC
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-07
    Fan Si; Xiao-Long Chen; Long Zhou; Yi-Fei Zhang; Sheng-Hui Zhang; Xin-Yue Ju; Xiu-Jun Li; Xin Dong; Nu Xu

    We present a study of charm and beauty isolation based on a data-driven method with recent measurements on heavy flavor hadrons and their decay electrons in Au+Au collisions at sNN = 200 GeV at RHIC. The individual electron pT spectra, RAA and v2 distributions from charmed and beauty hadron decays are obtained. We find that the electron RAA from beauty hadron decays (RAAb→e) is suppressed in minimum

    更新日期:2020-05-07
  • On the effective theory of neutrino-electron and neutrino-quark interactions
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-07
    Richard J. Hill; Oleksandr Tomalak

    We determine the four-fermion effective theory of neutrino interactions within the Standard Model including one-loop electroweak radiative corrections, in combination with the measured muon lifetime and precision electroweak data. Including two-loop matching and three-loop running corrections, we determine lepton coefficients accounting for all large logarithms through relative order O(ααs) and quark

    更新日期:2020-05-07
  • Impact of a thermal medium on D mesons and their chiral partners
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-05
    Glòria Montaña; Àngels Ramos; Laura Tolós; Juan M. Torres-Rincon

    We study D and Ds mesons at finite temperature using an effective field theory based on chiral and heavy-quark spin-flavor symmetries within the imaginary-time formalism. Interactions with the light degrees of freedom are unitarized via a Bethe-Salpeter approach, and the D and Ds self-energies are calculated self-consistently. We generate dynamically the D0⁎(2300) and Ds(2317) states, and study their

    更新日期:2020-05-05
  • Measurement of the cross section for hard exclusive π0 muoproduction on the proton
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-05

    We report on a measurement of hard exclusive π0 muoproduction on the proton by COMPASS using 160 GeV/c polarised μ+ and μ− beams of the CERN SPS impinging on a liquid hydrogen target. From the average of the measured μ+ and μ− cross sections, the virtual-photon proton cross section is determined as a function of the squared four-momentum transfer between initial and final proton in the range 0.08(GeV/c)2<|t|<0

    更新日期:2020-05-05
  • A quartet BCS-like theory
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-05
    V.V. Baran; D.S. Delion

    We present the idea of using a BCS-like four-body coherent state to describe the quartet correlations induced by the pairing interaction in nuclear systems. We detail the many-body formalism necessary to bring the nontrivial quarteting ansatz into a computationally tractable form. We discuss the particularities of our approach in the case of a schematic isovector pairing model.

    更新日期:2020-05-05
  • Magnetic excitation in relativistic heavy ion collisions
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-05
    I. Danhoni; F.S. Navarra

    In this note we study the conversion of nucleons into deltas induced by a strong magnetic field in ultraperipheral relativistic heavy ion collisions. The interaction Hamiltonian couples the magnetic field to the spin operator, which, acting on the spin part of the wave function, converts a spin 1/2 into a spin 3/2 state. We estimate this transition probability and calculate the cross section for delta

    更新日期:2020-05-05
  • Heavy - light flavor correlations of anisotropic flows at LHC energies within event-by-event transport approach
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-05
    Salvatore Plumari; Gabriele Coci; Vincenzo Minissale; Santosh K. Das; Yifeng Sun; Vincenzo Greco

    The heavy quarks (HQs) are a unique probe of the hot QCD matter properties and their dynamics are coupled to the locally thermalized expanding quark gluon plasma. We present here a novel study of the event by event correlations between light and heavy flavor flow harmonics at LHC energy within a transport approach. Interaction between heavy quarks and light quarks have been taken into account to explore

    更新日期:2020-05-05
  • Non-cancellation of the parity anomaly in the strong-field regime of QED2+1
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-05
    R. Ott; T.V. Zache; N. Mueller; J. Berges

    Quantum fluctuations lead to an anomalous violation of parity symmetry in quantum electrodynamics for an even number of spatial dimensions. While the leading parity-odd electric current vanishes in vacuum, we uncover a non-cancellation of the anomaly for strong electric fields with distinct macroscopic signatures. We perform real-time lattice simulations with fully dynamical gauge fields and Wilson

    更新日期:2020-05-05
  • The κ-Newtonian and κ-Carrollian algebras and their noncommutative spacetimes
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-05
    Angel Ballesteros; Giulia Gubitosi; Ivan Gutierrez-Sagredo; Francisco J. Herranz

    We derive the non-relativistic c→∞ and ultra-relativistic c→0 limits of the κ-deformed symmetries and corresponding spacetime in (3+1) dimensions, with and without a cosmological constant. We apply the theory of Lie bialgebra contractions to the Poisson version of the κ-(A)dS quantum algebra, and quantize the resulting contracted Poisson–Hopf algebras, thus giving rise to the κ-deformation of the Newtonian

    更新日期:2020-05-05
  • Multidimensional gravity with higher derivatives and inflation
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-05
    Júlio C. Fabris; Arkady A. Popov; Sergey G. Rubin

    We elaborate on the inflationary model starting from multidimensional Lagrangian and gravity with second-order curvature terms. The effective scalar field is related to the Ricci scalar of extra dimensions. It is shown that the Kretschmann and the Ricci tensor square terms dominate during inflation. The observable values of the spectral index and the tensor-to-scalar ratio are obtained for specific

    更新日期:2020-05-05
  • Evidence for the N′(1720)3/2+ nucleon resonance from combined studies of CLAS π+π−p photo- and electroproduction data
    Phys. Lett. B (IF 4.162) Pub Date : 2020-05-04
    V.I. Mokeev; V.D. Burkert; D.S. Carman; L. Elouadrhiri; E. Golovatch; R.W. Gothe; K. Hicks; B.S. Ishkhanov; E.L. Isupov; K. Joo; N. Markov; E. Pasyuk; A. Trivedi

    The analysis of the nine 1-fold differential cross sections for the γr,vp→π+π−p photo- and electroproduction reactions obtained with the CLAS detector at Jefferson Laboratory was carried out with the goal to establish the contributing resonances in the mass range from 1.6 GeV to 1.8 GeV. In order to describe the photo- and electroproduction data with Q2-independent resonance masses and hadronic decay

    更新日期:2020-05-04
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