Nuclear Theory·nucl-th

Wednesday·May 24, 2023

11 papers—4 primary·7 cross-listed

01
[Submitted on 23 May 2023]
Nonlocal optical potential in the inelastic deuteron scattering off $^{24}$ Mg
A. Deltuva · D. Jurčiukonis
Nonlocal nucleon-nucleus optical potential with rotational quadrupole deformation enabling the excitation of the $^{24} Mg (2^{+})$ state is developed; it fits well the proton- $^{24} Mg$ elastic and inelastic differential cross section in the beam energy range from 30 to 45 MeV per nucleon. The inelastic deuteron- $^{24} Mg$ scattering leading to the excited $^{24} Mg (2^{+})$ state is studied in the same energy regime by solving the three-body Faddeev-type equations for transition operators. Effects of the optical potential nonlocality are evaluated by comparison with local models. Significant effects on the inelastic differential cross section are found at forward angles up to the first peak and at larger angles beyond the second peak. Nonlocal optical potential provides a simultaneous reasonable reproduction of the experimental data for the elastic and inelastic proton- $^{24} Mg$ and deuteron- $^{24} Mg$ scattering, not achieved using local potentials.
Comments:
13 pages, 4 figures, to be published in Phys. Rev. C
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2305.13890 [pdf]
PRC(2023)·5 citations
02
[Submitted on 23 May 2023]
Nucleon-Nucleon elastic and inelastic scattering using quantum field theory: a comparative study
Raghad Al-Bakri🇸🇦 · Bassam Shehadeh🇸🇦
In this paper, we use Yukawa theory to calculate differential and total cross-sections for elastic and inelastic scattering in nucleon-nucleon interactions. We start from the fundamental Lagrangian and derive the $T$ -matrix and hence the invariant scattering matrix leading towards the differential and total cross section. We perform calculations utilizing two types of Yukawa interaction terms: 1) scalar current, and 2) pseudoscalar current. We also carry out calculations in a laboratory frame. Calculated results using scalar current exhibits the exact features of elastic and inelastic scattering. The results agree very well with the differential cross-sections for experimental data. The pseudoscalar current calculations do not offer reasonable results and features of the NN interactions. The simplicity of the theory makes it all the more impressive, thus it can be used in place of more complicated field theories to describe NN interactions.
Comments:
24 pages, 9 figures
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Computational Physics (physics.comp-ph)
arXiv:
2305.13968 [pdf]
1 citation
03
[Submitted on 23 May 2023]
Impacts of symmetry energy slope on the oscillation frequencies of neutron stars with short-range correlation and admixed dark matter
Bin Hong🇨🇳 · ZhongZhou Ren🇨🇳 · Chen Wu🇨🇳 · XueLing Mu🇨🇳
Oscillation modes of compact stars, in general, can serve as a fingerprint in determining the equation of state (EOS) of dense matter. In this study, we examine the impact of symmetry energy slope ( $L$ ) on the oscillation frequencies of neutron stars (NSs) with nucleon-nucleon short range correlation (SRC) and admixed dark matter (DM) for the first time within the relativistic mean-field theory. By adjusting the $L$ , we revise the EOS and coupling parameters in light of the SRC and DM effects, and construct the new sets. The results reveal that NSs containing SRC and DM inside are more likely to satisfy the observational constraints, and we find that smaller $L$ exhibits larger fundamental non-radial and radial frequencies, and that the effect on Large Separation (LG) is also mainly concentrated in the low-mass region. Moreover, we update the linear relationship between the non-radial frequency and mean density, and we further give empirical relations between non-radial and radial frequencies and tidal deformability at different $L$ for 1.4 $M_{⊙}$ and 2 $M_{⊙}$ . These findings will enable us to more effectively confine the NS EOSs, in turn, also provide a strategy to place constraints on the $L$ .
Comments:
18 pages, 13 figures
Subjects:
Nuclear Theory (nucl-th); General Relativity and Quantum Cosmology (gr-qc)
arXiv:
2305.14101 [pdf]
Class.Quant.Grav.(2023)·18 citations
04
[Submitted on 23 May 2023]
Advancing the IAV Model with CDCC Wave Functions for Realistic Descriptions of Two-Body Projectile Breakup
Jin Lei · Antonio M. Moro
Inclusive breakup is an important reaction mechanism of reactions induced by weakly bound nuclei. The Ichimura, Austern, and Vincent (IAV) model is widely used to analyze inclusive breakup processes and is based on a Distorted Wave Born Approximation (DWBA). However, the validity of the DWBA form for inclusive breakup requires further exploration. In this study, we present a derivation of the IAV model, using the continuum-discretized coupled-channels (CDCC) wave function, and apply it to the $d +^{93}$ Nb reaction. We examine the differences between the CDCC-IAV and DWBA-IAV models by artificially modifying the binding energy of the deuteron using two distinct types of optical potential. Our findings indicate that the CDCC method potentially provides a more fundamental description of the $d$ + $A$ interaction and may provide a more realistic description of the interior part of the wave function. This study offers significant potential in increasing the precision and dependability of weakly bound nuclei inclusive breakup process estimation within a fully quantum mechanical model.
Comments:
16 pages, 7 figures, submitted for publication
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2305.14111 [pdf]
PRC(2023)·14 citations
05
[Submitted on 22 May 2023] (cross-list from hep-ph)
Chiral magnetic effect in a cylindrical domain
Matteo Buzzegoli🇺🇸 · Kirill Tuchin🇺🇸
We compute the chiral magnetic effect (CME) in a cylindrical region coaxial with the external magnetic field. As the boundary condition we require vanishing of the radial component of the electric current on the cylinder side wall. We find that when the magnetic length is comparable to or larger than the cylinder radius, the CME is suppressed compared to the corresponding result in an infinite medium. As a result, for a given cylinder radius, the suppression is stronger in weak fields. We argue that the electric current generated by the CME vanishes at the cylinder wall and monotonically increases toward the symmetry axis.
Comments:
13 pages, 6 figures, final version published in PRD, typos
Subjects:
High Energy Physics — Phenomenology (hep-ph); Mesoscale and Nanoscale Physics (cond-mat.mes-hall); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2305.13149 [pdf]
PRD(2023)·4 citations
06
[Submitted on 16 May 2023] (cross-list from astro-ph.HE)
Rescaling strange-cluster stars and its implications on gravitational-wave echoes
Chen Zhang🇨🇳 · Yong Gao🇨🇳 · Cheng-Jun Xia🇨🇳 · Renxin Xu🇨🇳
Solid states of strange-cluster matter called strangeon matter can form strangeon stars that are highly compact. We show that strangeon matter and strangeon stars can be recast into dimensionless forms by a simple reparametrization and rescaling, through which we manage to maximally reduce the number of degrees of freedom. With this dimensionless scheme, we find that strangeon stars are generally compact enough to feature a photon sphere that is essential to foster gravitational-wave (GW) echoes. Rescaling the dimension back, we illustrate its implications on the expanded dimensional parameter space, and calculate the GW echo frequencies associated with strangeon stars, showing that the minimum echo frequency is $\sim 8$ kHz for empirical parameter space that satisfies the GW170817 constraint, and can reduce to $O (100)$ Hertz at the extended limit.
Comments:
8 pages, 6 figures. Published version. Typo fixed
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2305.13323 [pdf]
PRD(2023)·24 citations
07
[Submitted on 22 May 2023] (cross-list from hep-ph)
The Multiplicity Scaling of the Fragmentation Function
Zhong-Bo Kang🇺🇸 · Robert Kao🇺🇸 · Andrew J. Larkoski🇺🇸
The single-particle inclusive fragmentation function and the particle multiplicity are observables of fundamental importance in studying properties of quantum chromodynamics at colliders. It is well-known that at high energies, the multiplicity distribution satisfies KNO scaling in which all moments are proportional to powers of the mean multiplicity. We prove that, under weak assumptions, the leading dependence of the fragmentation function on multiplicity is itself a kind of KNO scaling in which all moments are inversely proportional to powers of the mean multiplicity. This scaling with multiplicity additionally accounts for the dominant dependence on collision energy in the fragmentation function. The proof relies crucially on properties of the fragmentation function conditioned on the total multiplicity and application of the Stieltjes moment problem. In the process, we construct a novel basis of the fragmentation function expressed as an overall exponential suppression times a series of Laguerre polynomials. We study this scaling of the fragmentation function in experimental electron-position collision data and observe that residual scale violations are significantly reduced.
Comments:
5 + 2 pages, 2 + 2 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2305.13359 [pdf]
PRD(2024)·4 citations
08
[Submitted on 22 May 2023] (cross-list from hep-ph)
How Macroscopic Limits on Neutron Star Baryon Loss Yield Microscopic Limits on Non-Standard-Model Baryon Decay
Jeffrey M. Berryman🇺🇸 · Susan Gardner🇺🇸 · Mohammadreza Zakeri🇺🇸
We investigate how our baryon-loss limits from anomalous binary-pulsar period lengthening can be interpreted microscopically to yield specific constraints on the particle physics of baryon number violation within a neutron star. We focus on the possibility of anomalous baryon disappearance via dark baryon processes and on scenarios in which the produced dark-sector particles do not survive to influence the response of the star to baryon-number-violating effects. We flesh out the conditions for which this may occur, as well as other key assumptions. We then turn to the analysis of particle processes in the dense nuclear medium found at the core of a neutron star, employing the techniques of relativistic mean-field theory. Using our study of in-medium effects and limits on macroscopic baryon number violation we extract limits on in-vacuum baryon-number-violating processes, and we determine them for various equations of state. We conclude by noting the implications of our results for models of dark-sector-enabled baryogenesis.
Comments:
Published version, 87 pages, 18 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Cosmology and Nongalactic Astrophysics (astro-ph.CO); High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2305.13377 [pdf]
PRD(2024)·15 citations
09
[Submitted on 22 May 2023] (cross-list from astro-ph.HE)
Fluid pulsation modes and tidal deformability of anisotropic strange stars in light of the GW $170817$ event
José D. V. Arbañil · Cesar V. Flores · César H. Lenzi · Juan M. Z. Pretel
The effects of the anisotropy on the fluid pulsation modes adopting the so-called Cowling approximation and tidal deformability of strange quark stars are investigated by using the numerical integration of the hydrostatic equilibrium, nonradial oscillations, and tidal deformability equations, being these equations modified from their standard form to include the anisotropic effects. The fluid matter inside the compact stars is described by the MIT bag model equation of state. For the anisotropy profile, we consider a local anisotropy that is both regular at the center and null at the star's surface. We find that the effect of the anisotropy is reflected in the fluid pulsation modes and tidal deformability. Finally, we analyze the correlation between the tidal deformability of the GW $170817$ event with the anisotropy.
Comments:
To appear in PRD
Subjects:
High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
arXiv:
2305.13468 [pdf]
PRD(2023)·20 citations
10
[Submitted on 23 May 2023] (cross-list from hep-ph)
Electromagnetic form factors for nucleons in short-range correlations
Wanli Xing🇦🇺 · Xuan-Gong Wang🇦🇺 · Anthony W. Thomas🇦🇺
Recent experimental studies have led to the suggestion that short-range correlations may be a major contributor to the nuclear EMC effect. This hypothesis requires that the structure function for nucleons involved in short-range correlations should be heavily suppressed compared to that of a free nucleon. Based on calculations performed within an AdS/QCD motivated, light-front quark-diquark model, we find that this large suppression of the nucleon structure function leads to a strong suppression of the nucleon elastic form factors.
Comments:
6 pages, 6 figures, 2 tables
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2305.13666 [pdf]
PLB(2023)·8 citations
11
[Submitted on 23 May 2023] (cross-list from hep-ph)
Vector quarkonia at the LHC with JETHAD: A high-energy viewpoint
Francesco Giovanni Celiberto🇪🇸
In this review we discuss and extend the study of the inclusive production of vector quarkonia, $J / ψ$ and $Υ$ , emitted with large transverse momenta and rapidities at the LHC. We adopt the novel ZCW19 $^{+}$ determination to depict the quarkonium production mechanism at the next-to-leading level of perturbative QCD. This approach is based on the nonrelativistic QCD formalism well adapted to describe the production of a quarkonium state from the collinear fragmentation of a gluon or a constituent heavy quark at the lowest energy scale. We rely upon the NLL/NLO $^{+}$ hybrid high-energy and collinear factorization for differential cross sections, where the standard collinear formalism is enhanced by the BFKL resummation of next-to-leading energy logarithms arising in the $t$ -channel. We employ the JETHAD method to analyze the behavior of rapidity distributions for double inclusive vector-quarkonium and inclusive vector-quarkonium plus jet emissions. We discovered that the natural stability of the high-energy series, previously observed in observables sensitive to the emission of hadrons with heavy flavor detected in the rapidity acceptance of LHC barrel calorimeters, becomes even more manifest when these particles are tagged in forward regions covered by endcaps. Our findings brace the important message that vector quarkonia at the LHC via the hybrid factorization offer a unique chance to perform precision studies of high-energy QCD, as well as an intriguing opportunity to shed light on the quarkonium production puzzle.
Comments:
42 pages, 8 figures, 526 references. Invited review article. Chapter I of the review pentalogy "Heavy hadrons with JETHAD: A high-energy viewpoint"
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2305.14295 [pdf]
Universe(2023)·35 citations

Affiliations

first authorsco-authorsvia INSPIRE