Nuclear Theory·nucl-th

Friday·April 1, 2022

11 papers—5 primary·6 cross-listed

01
[Submitted on 31 Mar 2022]
Pasta properties of the neutron star within effective relativistic mean-field model
Vishal Parmar · H. C. Das · Ankit Kumar · Ankit Kumar · M. K. Sharma · P. Arumugam · S. K. Patra
We study the properties of pasta structures and their influence on the neutron star observables employing the effective relativistic mean-field (E-RMF) model. The compressible liquid drop model is used to incorporate the finite size effects, considering the possibility of nonspherical structures in the inner crust. The unified equation of states are constructed for several E-RMF parameters to study various properties such as pasta mass and thickness in the neutron star's crust. The majority of the pasta properties are sensitive to the symmetry energy in the subsaturation density region. Using the results from Monte Carlo simulations, we estimate the shear modulus of the crust in the context of quasiperiodic oscillations from soft gamma-ray repeaters and calculate the frequency of fundamental torsional oscillation mode in the inner crust. Global properties of the neutron star such as mass-radius profile, the moment of inertia, crustal mass, crustal thickness, and fractional crustal moment of inertia are worked out. The results are consistent with various observational and theoretical constraints.
Comments:
16 pages, 10 figures, 3 tables, Published in Phys Rev. D. The unified equation of states are available on GitHub (https://github.com/hcdas/Unfied_pasta_eos)
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2203.16827 [pdf]
PRD(2022)·28 citations
02
[Submitted on 31 Mar 2022]
Quasielastic Charged-Current Neutrino-Nucleus Scattering with Nonrelativistic Nuclear Energy Density Functionals
Kyungsik Kim🇰🇷 · Hana Gil🇰🇷 · Chang Ho Hyun🇰🇷
Charged-current neutrino-nucleus scattering is studied in the quasielastic region with the KIDS (Korea-IBS-Daegu-SKKU) nuclear energy density functional. We focus on the uncertainties stemming from the axial mass and the in-medium effective mass of the nucleon. Comparing the result of theory to the state-of-the-art data from MiniBooNE, T2K, and MINER $ν$ A, we constrain the axial mass and the effective mass that are compatible with the data. We find that the total cross section is insensitive to the effective mass, so the axial mass could be determined independently of the uncertainty in the effective mass. Differential cross sections at different kinematics are, on the other hand, sensitive to the effective mass as well as the axial mass. Within the uncertainty of the axial mass constrained from the total cross section, dependence on the effective mass is examined. As a result we obtain the axial mass and the effective mass that are consistent with the experimental data.
Comments:
13 pages, 6 figures
Subjects:
Nuclear Theory (nucl-th)
arXiv:
2203.16841 [pdf]
PLB(2022)·15 citations
03
[Submitted on 31 Mar 2022]
Assessing the ultracentral flow puzzle in hydrodynamic modeling of heavy-ion collisions
A. V. Giannini🇧🇷 · M. N. Ferreira🇧🇷 · M. Hippert🇺🇸 · D. D. Chinellato🇧🇷 · G. S. Denicol🇧🇷 · M. Luzum🇧🇷 · J. Noronha🇺🇸 · T. Nunes da Silva🇧🇷 · J. Takahashi🇧🇷
An outstanding problem in heavy-ion collisions is the inability for models to accurately describe ultra-central experimental flow data, despite that being precisely the regime where a hydrodynamic description should be most applicable. We reassess the status of this puzzle by computing the flow in ultra-central collisions obtained from multiple recent Bayesian models that were tuned to various observables in different collision systems at typical centralities. While central data can now be described with better accuracy than in previous calculations, tension with experimental observation remains and worsens as one goes to ultra-central collisions. Tuning the model parameters cannot remove this tension without destroying the fit at other centralities. As such, new elements are likely needed in the standard modeling of heavy-ion collisions.
Comments:
v2: 8 pages, 4 figures. Added new fig. 1; extended discussions in the "results" and "conclusions" sections. Conclusion unchanged. Matches version accepted by PRC
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2203.17011 [pdf]
PRC(2023)·21 citations
04
[Submitted on 31 Mar 2022]
Evolution of the statistical disintegration of finite nuclei toward high energy
A.S. Botvina🇩🇪 · N. Buyukcizmeci🇹🇷 · M. Bleicher🇩🇪
We develop a statistical approach for the description of complex nuclei formation from dynamically produced baryons in high energy heavy-ion reactions. We consider a finite highly-excited expanding nuclear system formed after central nucleus-nucleus collisions. This system is sub-divided into primary equilibrated nucleon clusters. The final nuclei are produced after the decay of these excited clusters. By the successful comparison with the FOPI experimental data we prove the possibility of such a local equilibrium in nuclear matter with the temperature corresponding to the phase coexistence region. The regularities obtained in this new nuclei production mechanism are shown.
Comments:
13 pages, 12 figures, to be submitted to Phys. Rev. C 2022. arXiv admin note: text overlap with arXiv:2012.07679
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2203.17092 [pdf]
PRC(2022)·16 citations
05
[Submitted on 31 Mar 2022]
Effects of a strong phase transition on supernova explosions, compact stars and their mergers
Andreas Bauswein🇩🇪 · David Blaschke🇵🇱 · Tobias Fischer🇵🇱
We outline a theoretical approach supporting strong phase transitions from normal nuclear matter to the deconfined quark-gluon plasma, in the equation of state (EOS) for compact star matter. Implications of this hypothesis are discussed for astrophysical applications. Special emphasis is devoted to potentially detectable signatures, which can be directly related with the occurrence of a sufficiently strong phase transition. Therefore, simulations of core-collapse supernovae and binary compact star mergers are considered, including the subsequent emission of gravitational waves and, in the case of supernova, in addition the neutrinos play the role of messengers.
Comments:
39 pages, 13 figures, contribution submitted on 20.02.2022 to the Book "Astrophysics in the XXI Century with Compact Stars", edited by Cesar Augusto Zen Vasconcellos and Fridolin Weber, World Scientific
Subjects:
Nuclear Theory (nucl-th); High Energy Astrophysical Phenomena (astro-ph.HE)
arXiv:
2203.17188 [pdf]
Astrophysics in the XXI Century with Comp…·16 citations
06
[Submitted on 30 Mar 2022] (cross-list from hep-ph)
Exponential Approach to the Hydrodynamic Attractor in Yang-Mills Kinetic Theory
Xiaojian Du🇩🇪 · Michal P. Heller🇧🇪 · Sören Schlichting🇩🇪 · Viktor Svensson🇸🇪
We use principal component analysis to study the hydrodynamic attractor in Yang-Mills kinetic theory undergoing the Bjorken expansion with Color Glass Condensate initial conditions. The late time hydrodynamic attractor is characterized by a single principal component determining the overall energy scale. How it is reached is governed by the disappearance of single subleading principal component characterizing deviations of the pressure anisotropy, the screening mass and the scattering rate. We find that for wide range of couplings the approach to the hydrodynamic attractor at late times is well described by an exponential. Its decay rate dependence on the coupling turns out to translate into a simple dependence on the shear viscosity to entropy density ratio.
Comments:
12 pages, 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2203.16549 [pdf]
PRD(2022)·34 citations
07
[Submitted on 30 Mar 2022] (cross-list from hep-ph)
Speed of Sound for Hadronic and Quark Phases in a Magnetic Field
E. J. Ferrer🇺🇸 · A. Hackebill🇺🇸
In this paper we calculate the speed of sound for three phases that may exist inside a magnetized hybrid neutron star at different density regions: A hadronic phase at low densities, quark-matter in the magnetic dual chiral density wave (MDCDW) phase at intermediate densities and a free-quark phase modeled by the MIT bag model at higher densities. It is found that the speed of sound exhibits a non-monotonic behavior, that goes from values smaller than the conformal limit ( $c_{s}^{2} < 1/3$ ) in the hadronic phase, to peak ( $c_{s}^{2} > 1/3$ ) in the MDCDW phase, to finally reach the conformal limit ( $c_{s}^{2} \sim 1/3$ ) at higher densities for quarks in the MIT bag model. Also, the anisotropic speed of sound in the presence of a magnetic field is derived from first principles. This is a consequence of the anisotropy in the system's pressures produced by the breaking of the rotational symmetry in the presence of a magnetic field. The role played by the lowest Landau level contribution in affecting the speed of sound in the magnetized phases is discussed.
Comments:
Version to appear in Nucl. Phys. A
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2203.16576 [pdf]
NPA(2023)·22 citations
08
[Submitted on 31 Mar 2022] (cross-list from hep-ph)
Exclusive production of light vector mesons at next-to-leading order in the dipole picture
Heikki Mäntysaari🇫🇮 · Jani Penttala🇫🇮
Exclusive production of light vector mesons in deep inelastic scattering is calculated at next-to-leading order in the dipole picture in the limit of high photon virtuality. The resulting expression is free of any divergences and suitable for numerical evaluations. The higher-order corrections are found to be numerically important, but they can be mostly captured by the nonperturbative fit parameters describing the initial condition for the small- $x$ evolution of the dipole scattering amplitude. The vector meson production cross section is shown to depend only weakly on the meson distribution amplitude and the factorization scale. We also present phenomenological comparisons of our result to the existing exclusive $ϕ$ and $ρ$ production data from HERA and find an excellent agreement at high virtualities.
Comments:
25 pages, 25 figures; v2: Corrected typos, modified discussion at the end of Sec. IV
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2203.16911 [pdf]
PRD(2022)·47 citations
09
[Submitted on 31 Mar 2022] (cross-list from hep-ph)
Accessing pion GPDs through the Sullivan process: is it feasible?
Jose Manuel Morgado Chávez🇪🇸 · Valerio Bertone🇫🇷 · Maxime Defurne🇫🇷 · Feliciano de Soto🇪🇸 · Cédric Mezrag🇫🇷 · Hervé Moutarde🇫🇷 · José Rodríguez-Quintero🇪🇸 · Jorge Segovia🇪🇸
Describing hadronic structure is one of the most intriguing problems in physics. In this respect, generalized parton distributions (GPDs) constitute an outstanding tool, allowing to draw "three dimensional pictures" of hadron's inside. Starting from contemporary models for pion's GPDs fulfilling all constraints imposed by QCD, we compute Compton form factors (CFFs) of pions subjected to deeply virtual Compton scattering. We show the behaviour of CFFs to be gluon-dominated at EIC's kinematics. Finally we evaluate lepton-beam-spin asymmetries in the Sullivan process, demonstrating the existence of such and thus triggering optimism about the possibility of probing pion's 3D structure at electron-ion colliders.
Comments:
Proceedings of the 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman (HADRON2021), 26-31 July (2021), Mexico City (Mexico). To appear in Suplemento de la Revista Mexicana de Física
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2203.16947 [pdf]
Rev.Mex.Fis.Suppl.(2022)·4 citations
10
[Submitted on 31 Mar 2022] (cross-list from hep-ph)
Analytic Map of Three-Channel S Matrix -Generalized Uniformization and Mittag-Leffler Expansion-
Wren A. Yamada🇯🇵 · Osamu Morimatsu🇯🇵 · Toru Sato🇯🇵
We explore the analytic structure of the three-channel $S$ matrix by generalizing uniformization and making a single-valued map for the three-channel $S$ matrix. First, by means of the inverse Jacobi's elliptic function we construct a transformation from eight Riemann sheets of the center-of-mass energy squared complex plane onto a torus, on which the three-channel $S$ matrix is represented single-valued. Secondly, we show that the Mittag-Leffler expansion, a pole expansion, of the three-channel scattering amplitude includes not only topologically trivial but also nontrivial contributions and is given by the Weierstrass zeta function. Finally, we examine the obtained formula in the context of a simple three-channel model. Taking a simple non-relativistic effective field theory with contact interaction for the $S = - 2$ , $I = 0$ , $J^{P} = 0^{+}$ , $ΛΛ - N Ξ - ΣΣ$ coupled-channel scattering, we demonstrate that the scattering amplitude as a function of the uniformization variable is, in fact, given by the Mittag-Leffler expansion with the Weierstrass zeta function and that it is dominated by contributions from neighboring poles.
Comments:
7 pages, 7 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2203.17069 [pdf]
PRL(2022)·9 citations
11
[Submitted on 31 Mar 2022] (cross-list from hep-ph)
Triangle singularities in the $T_{cc}^{+} \to D^{*+} D^{0} \to π^{+} D^{0} D^{0}$ decay width
N.N. Achasov🇷🇺 · G.N. Shestakov🇷🇺
The values of the masses of the particles involved in the decay of $T_{cc}^{+} \to D^{*+} D^{0} \to π^{+} D^{0} D^{0}$ suggest that due to the final state interactions in the transition vertex $T_{cc}^{+} \to D^{*+} D^{0}$ there may be triangle logarithmic singularities. We discuss their possible role and show that the tree approximation for calculating the decay widths $T_{cc}^{+} \to (D^{*+} D^{0} + D^{* 0} D^{+}) \to π^{+} D^{0} D^{0}$ , $π^{0} D^{0} D^{+}$ , $γ D^{0} D^{+}$ is quite sufficient at the current level of measurement accuracy.
Comments:
5 pages, 4 figures; v2: published version, elusidations and four references added
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2203.17100 [pdf]
PRD(2022)·20 citations

Affiliations

first authorsco-authorsvia INSPIRE