Nuclear Theory·nucl-th

Friday·November 18, 2022

16 papers—8 primary·8 cross-listed

09
[Submitted on 16 Nov 2022] (cross-list from hep-ph)
Maximum entropy freezeout of hydrodynamic fluctuations
Maneesha Sushama Pradeep🇺🇸 · Mikhail Stephanov🇺🇸
We propose a general approach to freezing out fluctuations in heavy-ion collisions using the principle of maximum entropy. We find the results naturally expressed as a direct relationship between the irreducible relative correlators quantifying the deviations of hydrodynamic as well as hadron gas fluctuations from the ideal hadron gas baseline. The method also allows us to determine heretofore unknown parameters crucial for the freezeout of fluctuations near the QCD critical point in terms of the QCD equation of state.
Comments:
7 pages, minor edits, references added, version accepted by PRL
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2211.09142 [pdf]
PRL(2023)·34 citations
10
[Submitted on 16 Nov 2022] (cross-list from hep-ph)
Rethinking the $P_{c} (4457)^{+}$ as the $P_{ψ}^{Δ^{+}} (4457)$ isoquartet $D ˉ^{*} Σ_{c}$ molecule
Fang-Zheng Peng🇨🇳 · Mao-Jun Yan🇨🇳 · Mario Sánchez Sánchez🇫🇷 · Manuel Pavon Valderrama🇨🇳
The nature of the $P_{c} (4312)$ , $P_{c} (4440)$ and $P_{c} (4457)$ pentaquarks is a fascinating theoretical question. Within the molecular picture their more usual interpretation is that of $I = \frac{1}{2}$ $D ˉ Σ_{c}$ and $D ˉ^{*} Σ_{c}$ bound states. Here we argue in favor of interpreting the $P_{c} (4457)$ pentaquark as a $I = \frac{3}{2}$ $D ˉ^{*} Σ_{c}$ bound state (with spin $J = \frac{1}{2}$ ) instead. Owing to isospin symmetry breaking effects, with this identification the partial decay width of the $P_{c} (4457)^{+}$ into $J / ψ p$ will be of the same order of magnitude as the $P_{c} (4312)^{+}$ and $P_{c} (4440)^{+}$ , in contrast with the considerably larger partial decay width in the $I = \frac{1}{2}$ scenario. In turn, this leads to a different hidden-charm molecular pentaquark spectrum, in which there are only four or five $P_{ψ}^{N}$ bound states instead of the usual seven, which might explain why the predicted $J = \frac{1}{2}$ and $\frac{3}{2}$ ( $I = \frac{1}{2}$ ) $D ˉ^{*} Σ_{c}^{*}$ molecular partners of the $P_{c} (4312)$ and $P_{c} (4440)$ have not been observed.
Comments:
7 pages, 2 tables, 1 figure, corresponds with the published version
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
arXiv:
2211.09154 [pdf]
PLB(2023)·9 citations
11
[Submitted on 16 Nov 2022] (cross-list from hep-th)
Colliding localized, lumpy holographic shocks with a granular nuclear structure
Sebastian Waeber🇮🇱 · Laurence G. Yaffe🇺🇸
We apply a recent and simple technique which speeds up the calculation of localized collisions in holography to study more realistic models of heavy ion collisions via the gauge/gravity duality. The initial data takes into account the lumpy nuclear structure of real heavy ions and the projectiles' aspect ratio mimics the Lorentz contraction of nuclei during RHIC collisions. At the hydrodynamization time of the central region of the quark gluon plasma developed during the collision, we find that most of the vorticity three vector's absolute value is deposited far away from the hydrodynamized part of the plasma. Only the relativistic corrections to the thermal vorticity in the hydrodynamized region are non-negligible. We compare the transverse flow after the collision determined in this work with previous results, without granular initial conditions and determine the proper energy density and fluid velocity in a hydrodynamized subregion of the plasma.
Comments:
25 pages, 13 figures, figures 7,8,11,12 were added, introduction, result section and conclusion were expanded, typos were fixed
Subjects:
High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2211.09190 [pdf]
JHEP(2023)·5 citations
12
[Submitted on 17 Nov 2022] (cross-list from hep-ph)
Exotic states with triple charm
M. Bayar🇹🇷 · A. Martinez Torres🇪🇸 · K. P. Khemchandani🇪🇸 · R. Molina🇪🇸 · E. Oset🇪🇸
In this work we investigate the possibility of the formation of states from the dynamics involved in the $D^{*} D^{*} D^{*}$ system by considering that two $D^{*}$ 's generate a $J^{P} = 1^{+}$ bound state, with isospin 0, which has been predicted in an earlier theoretical work. We solve the Faddeev equations for this system within the fixed center approximation and find the existence of $J^{P} = 0^{-}$ , $1^{-}$ and $2^{-}$ states with charm $3$ , isospin $1/2$ , masses $\sim 6000$ MeV, which are manifestly exotic hadrons, i.e., with a multiquark inner structure.
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2211.09294 [pdf]
EPJC(2023)·15 citations
13
[Submitted on 17 Nov 2022] (cross-list from hep-ph)
Quantification of the hadronic CP violation contribution to the atomic EDMs
Nodoka Yamanaka🇯🇵
CP violating interactions are required to realize the matter abundance of our Universe. It is however known that the standard model of particle physics does not contain sufficient CP violation. The electric dipole moment (EDM) of atomic systems is a very sensitive experimental probe of CP violation beyond the standard model, and it is very actively studied in experiments. The atomic EDM has a significant sensitivity to hadronic CP violation, but its quantification has for long been obstructed by the nonperturbative physics of quantum chromodynamics. Quite recently, the contribution of the Weinberg operator (CP violating three-gluon interaction) to the atomic EDM has been analyzed, and we are almost attaining the quantification era of the CP violating hadronic interaction in the leading order of standard model effective field theory. In this proceedings contribution, we summarize the current attempt to quantify the hadronic CP violation contribution to the EDM of atoms.
Comments:
4 pages, 1 figure, proceedings of the 18th International Conference of Computational Methods in Sciences and Engineering (ICCMSE 2022), Crete, Greece, October 2022
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
arXiv:
2211.09521 [pdf]
AIP Conf.Proc.(2024)·1 citation
14
[Submitted on 17 Nov 2022] (cross-list from hep-ph)
Definition of gravitational local spatial densities for spin-0 and spin-1/2 systems
J. Yu. Panteleeva🇩🇪 · E. Epelbaum🇩🇪 · J. Gegelia🇩🇪 · U.-G. Meißner🇩🇪
We work out details of defining the spatial densities corresponding to the gravitational form factors of spin-0 and spin-1/2 systems using spherically symmetric sharply localized wave packets. The expressions for the spatial densities are provided in the frames with both zero and non-zero expectation values of the momentum operator.
Subjects:
High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
arXiv:
2211.09596 [pdf]
EPJC(2023)·29 citations
15
[Submitted on 17 Nov 2022] (cross-list from hep-ph)
Baryon and meson masses in the Nambu--Jona-Lasinio model: A Bayesian approach
Antoine Pfaff🇫🇷 · Hubert Hansen🇫🇷 · Juan M. Torres-Rincon🇪🇸 · Joerg Aichelin🇫🇷
We investigate the capabilities of the Nambu--Jona-Lasinio model to describe and reproduce fundamental vacuum properties of Quantum Chromodynamics, notably the hadronic spectrum. Mesons are described as quark-antiquark bound states at the level of the random phase approximation of the Bethe-Salpeter equation, while baryons are characterized as quark-diquark bound states within the static approximation of the Faddeev equation. Within a Bayesian framework, we constrain the model by phenomenologically known quantities and study the implications on its parameters and predictions in vacuum, as well as the correlations between the two. We find that within our framework, the vacuum masses of mesons and baryons can be reasonably well reproduced. Scalar diquarks need to be significantly bound in order to correctly reproduce the masses of the baryon octet, therefore enforcing values of the scalar diquark coupling larger than what is suggested by the canonical Fierz values. These findings could have important implications on the phenomenology of strongly-interacting matter at high temperature and density as well as of compact star physics.
Comments:
18 pages, 8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2211.09766 [pdf]
PRC(2023)·1 citation
16
[Submitted on 17 Nov 2022] (cross-list from hep-ph)
Colliding poles with colliding nuclei
Alexander Soloviev🇦🇹
In these proceedings, I will discuss collisions of poles in the complex plane as a signature of phase transitions for theories relevant to the quark gluon plasma. I will begin with an illustrative example, namely the chiral phase transition, which can be characterized by colliding poles as a function of temperature. Then, recognizing the interplay between weak and strong coupling sectors in a typical collision, I will introduce a hybrid model with a weakly broken symmetry, which has a rich quasi-hydrodynamic phenomenological description where hydrodynamic and non-hydrodynamic poles are unified by a common dispersion relation. I will show that energy is transferred initially from the soft to the hard sector before irreversibly transferring back to the soft sector at late times, and that the model reproduces many features common to dissipative systems with a weakly broken symmetry including the k-gap.
Comments:
8 pages, 6 figures. Proceedings for the 15th Quark Confinement and the Hadron Spectrum Conference (ConfXV)
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2211.09792 [pdf]
EPJ Web Conf.(2022)·2 citations

Affiliations

first authorsco-authorsvia INSPIRE