Nuclear Theory·nucl-th

Wednesday·January 10, 2024

6 papers—1 primary·5 cross-listed

01
Comments to the paper "Detailed study of the astrophysical direct capture reaction $^{6}$ Li( $p, γ$ ) $^{7}$ Be in a potential model approach" by E. M. Tursunov, S. A. Turakulov, and K. I. Tursunmakhatov, PHYSICAL REVIEW C 108, 065801 (2023)
S. B. Dubovichenko · A.S. Tkachenko · R. Ya. Kezerashvili
We explicitly present the comparison of the results for the astrophysical S-factor and reaction rate for the $^{6}$ Li( $p, γ$ ) $^{7}$ Be capture process at astrophysical energies, presented in Phys. Rev. Phys. Rev. C 105, 065806 (2022) and Phys. Rev. C 108. 065801 (2023) obtained within the famework of potential models. We demonstrate that both potential model approaches describe successfully the astrophysical S-factor and reaction rate simultaneously and reproduce the LUNA Collaboration [Phys. Rev. C 102, 052802(R) (2020)] results.
nucl-thastro-ph.SR0 citations
02
Leading order track functions in a hot and dense QGP
João Barata🇺🇸 · Robert Szafron🇺🇸
We study the modifications to the fragmentation pattern of partons into charged particles in the presence of a hot and dense Quark Gluon Plasma. To this end, we analyze the perturbative renormalization group equations of the track functions, which describe the energy fraction carried by charged hadrons. Focusing on pure Yang-Mills theory, we compute the lowest order moments of the medium-modified track functions, which are found to be sensitive to the reduced phase space for emissions in the medium and to energy loss. We use the extracted moments to calculate the Energy Energy Correlator (EEC) on tracks in the collinear limit. The EEC on medium-evolved tracks does not differ qualitatively from the EEC on vacuum tracks despite being sensitive to the color decoherence transition and suppressing the distribution due to quenching, as seen in other jet observables.
↳ hep-phhep-exnucl-thPRD(2024)·16 citations
03
On interpretation of fluctuations of conserved charges at high T
T.D. Cohen🇺🇸 · L.Ya. Glozman🇦🇹
Fluctuations of conserved charges calculated on the lattice which can be measured experimentally, are well reproduced by a hadron resonanse gas model at temperatures below T_{ch} ~ 155 MeV and radically deviate from the hadron resonance gas predictions above the chiral restoration crossover. This behavior is typically interpreted as an indication of deconfinement in the quark-gluon plasma regime. We present an argument that this interpretation may be too simple. The argument is based on the scaling of quantities with the number of colors: demonstration of deconfinement and QGP requires observable that is sensitive to N_c^2 gluons while the conserved charges are sensitive only to quarks and above T_{ch} scale as N_c^1. The latter scaling is consistent with the existence of an intermediate regime characterized by restored chiral symmetry and by approximate chiral spin symmetry which is a symmetry of confining interaction. In this regime the energy density, pressure and entropy density scale as N_c^1. In the large N_c limit this regime might become a distinct phase separated from the hadron gas and from QGP by phase transitions. A natural observable that associates with deconfinement and is directly sensitive to deconfined N_c^2-1 gluons is the Polyakov loop; in the N_c=3 world it remains very close to 0 at temperatures well above chiral crossover, reaches the value 0.5 around 3T_{ch} and the value close to 1 at temperatures ~1 GeV.
↳ hep-phhep-latnucl-exnucl-thEPJA(2024)·16 citations
04
Measuring jet quenching with a Bayesian inference analysis of hadron and jet data by JETSCAPE
R. Ehlers🇺🇸 · A. Angerami · R. Arora · S. A. Bass · S. Cao · Y. Chen · L. Du · H. Elfner · W. Fan · R. J. Fries · C. Gale · Y. He and 41 other authors
The JETSCAPE Collaboration reports the first multi-messenger study of the QGP jet transport parameter $q^$ using Bayesian inference, incorporating all available hadron and jet inclusive yield and jet substructure data from RHIC and the LHC. The theoretical model utilizes virtuality-dependent in-medium partonic energy loss coupled to a detailed dynamical model of QGP evolution. Tension is observed when constraining $q^$ for different kinematic cuts of the inclusive hadron data. The addition of substructure data is shown to improve the constraint on $q^$ , without inducing tension with the constraint due to inclusive observables. These studies provide new insight into the mechanisms of jet interactions in matter, and point to next steps in the field for comprehensive understanding of jet quenching as a probe of the QGP.
↳ hep-phnucl-exnucl-thEPJ Web Conf.(2024)·4 citations
05
Jet medium modifications
Carlota Andres🇫🇷
Since the start of the heavy-ion collision programs at the Relativistic Heavy Ion Collider and the Large Hadron Collider, the study of jet modifications resulting from their interactions with the produced QCD matter has provided a unique tool to investigate and characterize the properties of the quark-gluon plasma. In this mini-overview, I will present the recent theoretical advancements in describing and understanding the modifications of jets within a QCD medium.
↳ hep-phnucl-thPoS(2024)·0 citations
06
Production of true para-muonium in linearly polarized photon fusions
Jian-Ping Dai🇨🇳 · Shuai Zhao🇨🇳
True muonium (TM) -- the bound state of $μ^{+} μ^{-}$ -- has not been discovered yet. It was demonstrated that searching for TM via $γ γ$ fusions in heavy ion collisions is feasible due to the enhancement of the atom number. We study the production of the true para-muonium (pTM) in the collisions of linearly polarized photons in the experiments of heavy-ion collisions, calculate the production rate as well as the transverse spectrum of pTM, and explore the discovery potential in nuclear experiments. Our results show that there is a significant correlation between the linearly polarized photon distribution and the transverse momentum distribution of pTM. The optimal kinematic region of the generated pTM is identified, which can provide a theoretical guide to the detection of pTM in experiments.
↳ hep-phhep-exnucl-exnucl-thPRD(2024)·10 citations

Affiliations

first authorsco-authorsvia INSPIRE

Comments to the paper "Detailed study of the astrophysical direct capture reaction 6Li(p,γ)7Be in a potential model approach" by E. M. Tursunov, S. A. Turakulov, and K. I. Tursunmakhatov, PHYSICAL REVIEW C 108, 065801 (2023)

Leading order track functions in a hot and dense QGP

On interpretation of fluctuations of conserved charges at high T

Measuring jet quenching with a Bayesian inference analysis of hadron and jet data by JETSCAPE

Jet medium modifications

Production of true para-muonium in linearly polarized photon fusions

Affiliations

Comments to the paper "Detailed study of the astrophysical direct capture reaction $^{6}$ Li( $p, γ$ ) $^{7}$ Be in a potential model approach" by E. M. Tursunov, S. A. Turakulov, and K. I. Tursunmakhatov, PHYSICAL REVIEW C 108, 065801 (2023)