Nuclear Theory·nucl-th

Thursday·April 9, 2020

10 papers—1 primary·9 cross-listed

01
[Submitted on 8 Apr 2020]
Elastic and inelastic scattering of neutrinos and weakly interacting massive particles on nuclei
R. Sahu🇮🇳 · D. K. Papoulias🇬🇷 · V. K. B. Kota🇮🇳 · T. S. Kosmas🇬🇷
The event rates for WIMP-nucleus and neutrino-nucleus scattering processes, expected to be detected in ton-scale rare-event detectors, are investigated. We focus on nuclear isotopes that correspond to the target nuclei of current and future experiments looking for WIMP- and neutrino-nucleus events. The nuclear structure calculations, performed in the context of the deformed shell model, are based on Hartree-Fock intrinsic states with angular momentum projection and band mixing for both the elastic and the inelastic channels. Our predictions in the high-recoil-energy tail show that detectable distortions of the measured/expected signal may be interpreted through the inclusion of the non-negligible incoherent channels
Comments:
34 pages, 13 figures, 3 tables. V2: matches published version in PRC
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2004.04055 [pdf]
PRC(2020)·20 citations
02
[Submitted on 7 Apr 2020] (cross-list from hep-th)
Adding crust to BPS Skyrme neutron stars
C. Adam🇪🇸 · J. Sanchez-Guillen🇪🇸 · R. Vazquez🇪🇸 · A. Wereszczynski🇵🇱
The Skyrme model and its generalisations provide a conceptually appealing field-theory basis for the description of nuclear matter and, after its coupling to gravity, also of neutron stars. In particular, a specific Skyrme submodel, the so-called Bogomol'nyi-Prasad-Sommerfield (BPS) Skyrme model, allows both for an exact field-theoretic and a mean-field treatment of neutron stars, as a consequence of its perfect fluid property. A pure BPS Skyrme model description of neutron stars, however, only describes the neutron star core, by construction. Here we consider different possibilities to extrapolate a BPS Skyrme neutron star at high baryon density to a description valid at lower densities. In the exact field-theoretic case, a simple effective description of the neutron star crust can be used, because the exact BPS Skyrme neutron star solutions formally extend to sufficiently low densities. In the mean-field case, on the other hand, the BPS Skyrme neutron star solutions always remain above the nuclear saturation density and, therefore, must be joined to a different nuclear physics equation of state already for the outer core. We study the resulting neutron stars in both cases, facilitating an even more complete comparison between Skyrmionic neutron stars and neutron stars obtained from other approaches, as well as with observations.
Comments:
Latex, 21 pages, 3 figures; v3: version as accepted in PRD
Subjects:
High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2004.03610 [pdf]
PRD(2020)·4 citations
03
[Submitted on 7 Apr 2020] (cross-list from hep-ph)
Spectra and Decay Constants of $B_{c}$ -like and $B_{0}^{*}$ Mesons in QCD
Stephan Narison (LUPM-CNRS-IN2P2, Montpellier)🇫🇷
Using the existing state of art of the QCD expressions of the two-point correlators into the Inverse Laplace sum rules (LSR) within stability criteria, we present a first analysis of the spectra and decay constants of B_c-like scalar (0^{++}) and axial-vector (1^{++}) mesons and revisit the ones of the B^*_c(1^{--}) vector meson. Improved predictions are obtained by combining these LSR results with the some mass-splittings from Heavy Quark Symmetry (HQS). We complete the analysis by revisiting the B^*_{0}(0^{++}) mass which might be likely identified with the B^*_J(5732) experimental candidate. The results for the spectra collected in Table 2 are compared with some recent lattice and potential models ones. New estimates of the decay constants are given in Table 3.
Comments:
11 pages, 14 Figures, 3 Tables : Misprints corrected - Version to appear in Phys. Lett. B. arXiv admin note: text overlap with arXiv:1906.03614
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2004.03622 [pdf]
PLB(2020)·14 citations
04
[Submitted on 7 Apr 2020] (cross-list from hep-ph)
Mass sum rules of the electron in quantum electrodynamics
S. Rodini (Pavia U. and INFN, Pavia)🇮🇹 · A. Metz (Temple U.)🇺🇸 · B. Pasquini (Pavia U. and INFN, Pavia)🇮🇹
Different decompositions of the nucleon mass, in terms of the masses and energies of the underlying constituents, have been proposed in the literature. We explore the corresponding sum rules in quantum electrodynamics for an electron at one-loop order in perturbation theory. To this end we compute the form factors of the energy-momentum tensor, by paying particular attention to the renormalization of ultraviolet divergences, operator mixing and scheme dependence. We clarify the expressions of all the proposed sum rules in the electron rest frame in terms of renormalized operators. Furthermore, we consider the same sum rules in a moving frame, where they become energy decompositions. Finally, we discuss some implications of our study on the mass sum rules for the nucleon.
Comments:
21 pages, 1 figure; V2: minor changes, references added, to appear in JHEP
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2004.03704 [pdf]
JHEP(2020)·36 citations
05
[Submitted on 8 Apr 2020] (cross-list from hep-ph)
Transverse single spin asymmetry $A_{U T}^{s i n (ϕ_{h} - ϕ_{S})}$ for single hadron production in SIDIS
Xuan Luo🇨🇳 · Hao Sun🇨🇳
In this paper we study the single spin asymmetry $A_{U T}^{s i n (ϕ_{h} - ϕ_{S})}$ of a single hadron production in semi-inclusive deep inelastic scattering (SIDIS) within the framework of transverse momentum dependent (TMD) factorization up to next-to-leading logarithmic (NLL) order of QCD. The asymmetry is contributed by the convolution of the Sivers function and the unpolarized fragmentation function. Specifically, the Sivers function in the coordinate space and perturbative region can be represented as the convolution of the $C$ -coefficients and the corresponding collinear correlation functions, among which the Qiu-Sterman function is the most relevant one. We perform a detailed phenomenological analysis of the Sivers asymmetry at the kinematics of the HERMES and the COMPASS measurements. It is found that the obtained $x_{B}$ -, $z_{h}$ - and $P_{h ⊥}$ -dependent asymmetries are basically consistent with the HERMES and the COMPASS measurements.
Comments:
12 pages, 9 figures, arxiv version updated
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2004.03764 [pdf]
PRD(2020)·8 citations
06
[Submitted on 8 Apr 2020] (cross-list from hep-ph)
Dependence of temperatures and kinetic freeze-out volume on centrality in Au-Au and Pb-Pb collisions at high energy
Muhammad Waqas🇨🇳 · Fu-Hu Liu🇨🇳 · Zafar Wazir🇵🇰
Centrality-dependent double-differential transverse momentum spectra of negatively charged particles ( $π^{-}$ , $K^{-}$ and $p ˉ$ ) at mid-(pseudo)rapidity interval in nuclear collisions are analyzed by the standard distribution in terms of multi-component. The experimental data measured in gold-gold (Au-Au) collisions by the PHENIX Collaboration at the Relativistic Heavy Ion Collider (RHIC) and in lead-lead (Pb-Pb) collisions by the ALICE Collaboration at the Large Hadron Collider (LHC) are studied. The effective temperature, initial temperature, kinetic freeze-out temperature, transverse flow velocity and kinetic freeze-out volume are extracted from the fitting to transverse momentum spectra. We observed, that the mentioned five quantities increase with the increase of event centrality due to the fact that the average transverse momentum increases with the increase of event centrality. This renders that larger momentum (energy) transfer and further multiple-scattering had happened in central centrality.
Comments:
15 pages, 9 figures. Advances in High Energy Physics, accepted
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2004.03773 [pdf]
Adv.High Energy Phys.(2020)·30 citations
07
[Submitted on 8 Apr 2020] (cross-list from hep-ph)
Do short-range correlations cause the nuclear EMC effect in the deuteron?
X. G. Wang🇦🇺 · A. W. Thomas🇦🇺 · W. Melnitchouk🇺🇸
The relative contributions to the valence nuclear EMC effect in the deuteron arising from off-shell effects and Fermi motion are examined in models which include nuclear binding and off-shell effects. Contrary to expectations, the effect of Fermi motion overwhelms the off-shell effects for nucleons in short-range correlations (SRCs), calling into question the hypothesized causal connection between SRCs and the EMC effect.
Comments:
5 pages, 3 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2004.03789 [pdf]
PRL(2021)·24 citations
08
[Submitted on 7 Apr 2020] (cross-list from hep-th)
Polarization in relativistic fluids: a quantum field theoretical derivation
F. Becattini (University of Florence)🇮🇹
We review the calculation of polarization in a relativistic fluid within the framework of statistical quantum field theory. We derive the expressions of the spin density matrix and the mean spin vector both for a single quantum relativistic particle and for a quantum free field. After introducing the formalism of the covariant Wigner function for the scalar and the Dirac field, the relation between spin density matrix and the covariant Wigner function is obtained. The formula is applied to the fluid produced in relativistic nuclear collisions by using the local thermodynamic equilibrium density operator and recovering previously known formulae. The dependence of these results on the spin tensor and pseudo-gauge transformations of the stress-energy tensor is addressed.
Comments:
24 pages, 1 figure; version published in Lecture Notes in Physics
Subjects:
High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2004.04050 [pdf]
Lect.Notes Phys.(2021)·56 citations
09
[Submitted on 8 Apr 2020] (cross-list from cond-mat.supr-con)
The Superconducting Critical Temperature
Mike Guidry · Yang Sun · Lian-Ao Wu
Two principles govern the critical temperature for superconducting transitions: (1)~intrinsic strength of the pair coupling and (2)~effect of the many-body environment on the efficiency of that coupling. Most discussions take into account only the first but we argue that the properties of unconventional superconductors are governed more often by the second, through dynamical symmetry relating normal and superconducting states. Differentiating these effects is essential to charting a path to the highest-temperature superconductors.
Subjects:
Superconductivity (cond-mat.supr-con); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
arXiv:
2004.04066 [pdf]
Symmetry(2021)·0 citations
10
[Submitted on 8 Apr 2020] (cross-list from hep-ph)
Deconfinement in the presence of a strong magnetic field
Pok Man Lo (Wroclaw U.)🇵🇱 · Michal Szymanski (Wroclaw U.)🇵🇱 · Chihiro Sasaki (Wroclaw U.)🇵🇱 · Krzysztof Redlich (Wroclaw U. and CERN-TH)🇵🇱
We study the impact of a finite magnetic field on the deconfinement phase transition for heavy quarks by computing the fluctuations of the Polyakov loops. It is demonstrated that the explicit Z(3) breaking field increases with the magnetic field, leading to a decrease in the (pseudo) critical temperatures and a shrinking first-order region in the phase diagram. Phenomenological equations that capture the behaviors of the Z(3) breaking field at strong and weak magnetic fields for massive and massless quarks are given. Lastly, we explore the case of dynamical light quarks and demonstrate how an improved constituent quark mass function can enforce the correct magnetic field dependence of the deconfinement temperature in an effective model, as observed in Lattice QCD calculations.
Comments:
17 pages, 13 figures, version in Phys. Rev. D
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2004.04138 [pdf]
PRD(2020)·11 citations

Affiliations

first authorsco-authorsvia INSPIRE