Nuclear Theory·nucl-th

Thursday·August 11, 2022

9 papers—2 primary·7 cross-listed

01
[Submitted on 10 Aug 2022]
Van der Waals type PV diagrams of PNJL matter
Manjeet Seth🇮🇳 · Kinkar Saha🇮🇳 · Sudipa Upadhaya🇮🇳 · Soumitra Maity🇮🇳 · Sabyasachi Ghosh🇮🇳
Keeping in the mind about Van der Walls gas equation, we have explore PV diagram of quark matter by using PNJL model and we find a qualitative similarity.
Comments:
presented in DAE SNP 21 ( http://www.sympnp.org/proceedings/65/ ), which carry few typo but corrected in arxiv version
Subjects:
Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
arXiv:
2208.05311 [pdf]
0 citations
02
[Submitted on 10 Aug 2022]
Impact of nuclear structure on longitudinal flow decorrelations in high-energy isobar collisions
Maowu Nie🇨🇳 · Chunjian Zhang🇺🇸 · Zhenyu Chen🇨🇳 · Li Yi🇨🇳 · Jiangyong Jia🇺🇸
Fluctuations of harmonic flow along pseudorapidity, known as flow decorrelations, are an important probe of the initial state geometry of the quark-gluon plasma. The flow decorrelations are shown to be sensitive to the collective structure of the colliding nuclei, as revealed clearly by comparing collisions of isobars, $^{96}$ Ru+ $^{96}$ Ru and $^{96}$ Zr+ $^{96}$ Zr, which have different nuclear structures. The flow decorrelations in central collisions are mostly sensitive to nuclear deformations, while those in the mid-central collisions are primarily sensitive to differences in skin thickness between $^{96}$ Ru and $^{96}$ Zr. Longitudinal flow decorrelations in heavy-ion collisions are a new tool to probe the structure of colliding nuclei.
Subjects:
Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
arXiv:
2208.05416 [pdf]
PLB(2023)·21 citations
03
[Submitted on 9 Aug 2022] (cross-list from hep-ph)
CGC for Ultra-Peripheral Pb+Pb Collisions at the Large Hadron Collider: a more realistic calculation
Haowu Duan🇺🇸 · Alexander Kovner🇺🇸 · Vladimir V. Skokov🇺🇸
We provide the first calculation of two-gluon production at mid-rapidity in ultra-peripheral collisions in the Color Glass Condensate framework. To estimate systematic uncertainty associated with poor understanding of the wave function of the nearly real photon, we consider two diametrically different models: the dilute quark-antiquark dipole approximation and a vector meson, in which color charge density is approximated by McLerran-Venugopalan model. In the experimentally relevant range, the target nucleus can be faithfully approximated by a highly saturated state. This simplification enables us to perform efficient numerical simulations and extract the two-gluon correlation functions and the associated azimuthal harmonics.
Comments:
35 pages,8 figures
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2208.05000 [pdf]
JHEP(2022)·5 citations
04
[Submitted on 9 Aug 2022] (cross-list from hep-ph)
Gravitational Tensor-Monopole Moment of Hydrogen Atom To Order $O (α)$
Xiangdong Ji · Yizhuang Liu
We calculate the gravitational tensor-monopole moment of the momentum-current density $T^{ij}$ in the ground state of the hydrogen atom to order $O (α)$ in quantum electrodynamics (QED). The result is \begin{align} \tau_H/\tau_0 - 1 = \frac{4\alpha}{3\pi}\left(\ln\alpha^2-0.028\right) \nonumber \end{align} where $τ_{0} = ℏ^{2} /4 m_{e}$ is the leading-order moment. The physics of the next-to-leading-order correction is similar to that of the famous Lamb shift for energy levels.
Comments:
22 pages, 9 figures. Typos corrected from v1
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
arXiv:
2208.05029 [pdf]
PRD(2024)·23 citations
05
[Submitted on 9 Aug 2022] (cross-list from nucl-ex)
Excitation and probing of low-energy nuclear states at high-energy storage rings
Junlan Jin · Hendrik Bekker · Tobias Kirschbaum · Yuri A. Litvinov · Adriana Pálffy · Jonas Sommerfeldt · Andrey Surzhykov · Peter G. Thirolf · Dmitry Budker
$^{229}$ Th with a low-lying nuclear isomeric state is an essential candidate for a nuclear clock as well as many other applications. Laser excitation of the isomeric state has been a long-standing goal. With relativistic $^{229}$ Th ions in storage rings, high-power lasers with wavelengths in the visible range or longer can be used to achieve high excitation rates of $^{229}$ Th isomers. This can be realized through direct resonant excitation, or excitation via an intermediate nuclear or electronic state, facilitated by the tunability of both the laser-beam and ion-bunch parameters. Unique opportunities are offered by highly charged $^{229}$ Th ions due to the nuclear-state mixing. The significantly reduced isomeric-state lifetime corresponds to a much higher excitation rate for direct resonant excitation. Importantly, we propose electric dipole transitions changing both the electronic and nuclear states that are opened by the nuclear hyperfine mixing. We suggest using them for efficient isomer excitation in Li-like $^{229}$ Th ions, via stimulated Raman adiabatic passage or single-laser excitation. We also propose schemes for probing the isomers, utilizing nuclear radiative decay or laser spectroscopy on electronic transitions, through which the isomeric-state energy can be determined with an orders-of-magnitude higher precision than the current value. The schemes proposed here for $^{229}$ Th could also be adapted to low-energy nuclear states in other nuclei, such as $^{229}$ Pa.
Comments:
20+7 pages, 12 figures
Subjects:
Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th); Accelerator Physics (physics.acc-ph); Atomic Physics (physics.atom-ph)
arXiv:
2208.05042 [pdf]
PRResearch(2023)·15 citations
06
[Submitted on 10 Aug 2022] (cross-list from nucl-ex)
An improved method to access initial states in relativistic heavy-ion collisions
Somadutta Bhatta🇺🇸 · Vipul Bairathi🇨🇱
Observables in heavy-ion collisions are generally categorized into centralities, which reflect an average over events within a range of impact parameter including a wide variety of initial state configurations. A multiple binning method using spectator neutrons within each centrality has been previously shown to provide access to events with rare initial state conditions. This work suggests an improvement in quantifying the difference between standard centrality and spectator neutron binning towards accessing the initial state properties. A selection of events with higher initial state density at fixed participating nucleon number was observed to result in larger final state particle production and smaller elliptic flow. The relative difference between observables in centrality and spectator binning shows reduced sensitivity for the observables dominated by impact parameter fluctuations in initial state such as triangular flow. This property makes the spectator binning method a good candidate to separate geometric contributions from random fluctuations in initial state towards final state observables.
Comments:
14 pages, 6 figures
Subjects:
Nuclear Experiment (nucl-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2208.05157 [pdf]
EPJC(2022)·2 citations
07
[Submitted on 10 Aug 2022] (cross-list from hep-ph)
Centrality and Transverse Spherocity dependent study of charged-particle production in Xe-Xe collisions at $s_{N N}$ = 5.44 TeV using PYTHIA8 Angantyr and AMPT models
Randhir Singh
Transverse Spherocity is an event structure variable which provide an effective way to disentangle the data into hard and soft components of the processes corresponding to events with small and large numbers of multi-parton interactions (MPI), respectively. Recent experimental results in small systems from the LHC suggest the importacnce of transverse spherocity variable in the classification of the events. In this contribution, we have studied the dynamics of identified particle production in Xe-Xe collisions at $s_{N N}$ = 5.44 TeV using A Multi-Phase Transport Model (AMPT) and the recently developed Angantyr model, which is incorporated within PYTHIA8. A study of the transverse momentum spectra of the dentified particles are presented for soft (isotropic) and hard (jetty-like) events in different centrality intervals.
Subjects:
High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2208.05212 [pdf]
Ukr.J.Phys.(2022)·2 citations
08
[Submitted on 10 Aug 2022] (cross-list from hep-lat)
Neutrinoless Double Beta Decay from Lattice QCD: The Short-Distance $π^{-} \to π^{+} e^{-} e^{-}$ Amplitude
William Detmold🇺🇸 · William I. Jay🇺🇸 · David J. Murphy🇺🇸 · Patrick R. Oare🇺🇸 · Phiala E. Shanahan🇺🇸
This work presents a determination of potential short-distance contributions to the unphysical $π^{-} \to π^{+} e^{-} e^{-}$ decay through lattice QCD calculations. The hadronic contributions to the transition amplitude are described by the pion matrix elements of five Standard Model Effective Field Theory operators, which are computed on five ensembles of domain-wall fermions with $N_{f} = 2 + 1$ quark flavors with a range of heavier-than-physical values of the light quark masses. The matrix elements are extrapolated to the continuum, physical light-quark mass, and infinite volume limit using a functional form derived in chiral Effective Field Theory ( $χ EFT$ ). This extrapolation also yields the relevant low-energy constants of $χ EFT$ , which are necessary input for $χ EFT$ calculations of neutrinoless double beta decay of nuclei.
Comments:
24 pages, 17 figures
Subjects:
High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
arXiv:
2208.05322 [pdf]
PRD(2023)·22 citations
09
[Submitted on 10 Aug 2022] (cross-list from hep-lat)
Equation of state of a hot-and-dense quark gluon plasma: lattice simulations at real $μ_{B}$ vs. extrapolations
Szabolcs Borsanyi🇩🇪 · Zoltan Fodor🇩🇪 · Matteo Giordano🇭🇺 · Jana N. Guenther🇩🇪 · Sandor D. Katz🇭🇺 · Attila Pasztor🇭🇺 · Chik Him Wong🇩🇪
The equation of state of the quark gluon plasma is a key ingredient of heavy ion phenomenology. In addition to the traditional Taylor method, several novel approximation schemes have been proposed with the aim of calculating it at finite baryon density. In order to gain a pragmatic understanding of the limits of these schemes, we compare them to direct results at $μ_{B} > 0$ , using reweighting techniques free from an overlap problem. We use 2stout improved staggered fermions with 8 time-slices and cover the entire RHIC BES range in the baryochemical potential, up to $μ_{B} / T = 3$ .
Comments:
7 pages, 3 figures
Subjects:
High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
arXiv:
2208.05398 [pdf]
PRD(2023)·39 citations

Affiliations

first authorsco-authorsvia INSPIRE