Nuclear Theory·nucl-th

Tuesday·November 21, 2023

19 papers—14 primary·5 cross-listed

15
Exploration of hadronization through heavy flavor production at the future Electron-Ion Collider
Xuan Li🇺🇸
The future Electron-Ion Collider will utilize high-luminosity high-energy electron+proton ( $e + p$ ) and electron+nucleus ( $e + A$ ) collisions to solve several fundamental questions in the high energy nuclear physics field. Heavy flavor products play an important role in constraining the initial-state nucleon/nucleus parton distribution functions especially in the high and low Bjorken-x ( $x_{B J}$ ) region and exploring the final-state parton propagation and hadronization processes under different nuclear medium conditions. Latest simulation studies of heavy flavor hadron and jet measurements with the EIC project detector conceptual design will be discussed. The projected statistical accuracy of heavy flavor jet and heavy flavor hadron inside jet measurements in comparison with latest theoretical calculations will be presented.
↳ nucl-exhep-exnucl-thEPJ Web Conf.(2024)·4 citations
16
Production of Protons and Light Nuclei in Au+Au Collisions at $s_{NN}$ = 3 GeV with the STAR Detector
STAR Collaboration: M. I. Abdulhamid · B. E. Aboona · J. Adam · L. Adamczyk · J. R. Adams · I. Aggarwal · M. M. Aggarwal · Z. Ahammed · E. C. Aschenauer · S. Aslam · J. Atchison · V. Bairathi and 354 other authors
We report the systematic measurement of protons and light nuclei production in Au+Au collisions at $s_{NN}$ = 3 GeV by the STAR experiment at the Relativistic Heavy Ion Collider (RHIC). The transverse momentum ( $p_{T}$ ) spectra of protons ( $p$ ), deuterons ( $d$ ), tritons ( $t$ ), $^{3} He$ , and $^{4} He$ are measured from mid-rapidity to target rapidity for different collision centralities. We present the rapidity and centrality dependence of particle yields ( $d N / d y$ ), average transverse momentum ( $⟨ p_{T} ⟩$ ), yield ratios ( $d / p$ , $t / p$ , $^{3} He / p$ , $^{4} He / p$ ), as well as the coalescence parameters ( $B_{2}$ , $B_{3}$ ). The 4 $π$ yields for various particles are determined by utilizing the measured rapidity distributions, $d N / d y$ . Furthermore, we present the energy, centrality, and rapidity dependence of the compound yield ratios ( $N_{p} \times N_{t} / N_{d}^{2}$ ) and compare them with various model calculations. The physics implications of those results on the production mechanism of light nuclei and on QCD phase structure are discussed.
↳ nucl-exnucl-thPRC(2024)·45 citations
17
Rapidity and Energy Dependences of Temperatures and Volume Extracted from Identified Charged Hadron Spectra in Proton-Proton Collisions at a Super Proton Synchrotron (SPS)
Pei-Pin Yang🇨🇳 · Fu-Hu Liu🇨🇳 · Khusniddin K. Olimov🇺🇿
The standard (Bose-Einstein/Fermi-Dirac or Maxwell-Boltzmann) distribution from the relativistic ideal gas model is used to study the transverse momentum ( $p_{T}$ ) spectra of identified charged hadrons ( $π^{-}$ , $π^{+}$ , $K^{-}$ , $K^{+}$ , $p ˉ$ , and $p$ ) with different rapidities produced in inelastic proton-proton ( $pp$ ) collisions at the Super Proton Synchrotron (SPS). The experimental data measured by the NA61/SHINE Collaboration at the center-of-mass (c.m.) energies $s = 6.3$ , 7.7, 8.8, 12.3, and 17.3 GeV are fitted well by the distribution. It is shown that the effective temperature ( $T_{e f f}$ or $T$ ), kinetic freeze-out temperature ( $T_{0}$ ), and initial temperature ( $T_{i}$ ) decrease with the increase in rapidity and increase with the increase in c.m. energy. The kinetic freeze-out volume ( $V$ ) extracted from the $π^{-}$ , $π^{+}$ , $K^{-}$ , $K^{+}$ , and $p ˉ$ spectra decreases with the rapidity and increase with the c.m. energy. The opposite tendency of $V$ , extracted from the $p$ spectra, is observed to be increasing with the rapidity and decreasing with the c.m. energy due to the effect of leading protons.
↳ hep-phhep-exnucl-exnucl-thEntropy(2023)·7 citations
18
Dense $QCD_{2}$ with matrix product states
Tomoya Hayata🇯🇵 · Yoshimasa Hidaka🇯🇵 · Kentaro Nishimura🇯🇵
We study one-flavor $SU (2)$ and $SU (3)$ lattice QCD in ( $1 + 1$ ) dimensions at zero temperature and finite density using matrix product states and the density matrix renormalization group. We compute physical observables such as the equation of state, chiral condensate, and quark distribution function as functions of the baryon number density. As a physical implication, we discuss the inhomogeneous phase at nonzero baryon density, where the chiral condensate is inhomogeneous, and baryons form a crystal. We also discuss how the dynamical degrees of freedom change from hadrons to quarks through the formation of quark Fermi seas.
↳ hep-lathep-thnucl-thquant-phJHEP(2024)·21 citations
19
Far-from-equilibrium attractors with Full Relativistic Boltzmann approach in boost-invariant and non-boost-invariant systems
Vincenzo Nugara (1 and 2)🇮🇹 · Salvatore Plumari (1 and 2)🇮🇹 · Lucia Oliva (1 and 3)🇮🇹 · Vincenzo Greco (1 and 2) ((1) Department of Physics and Astronomy, University of Catania, Via S. Sofia 64, I-95125 Catania, (2) INFN-Laboratori Nazionali del Sud, Via S. Sofia 62, I-95123 Catania, Italy, (3) INFN Sezione di Catania, Via S. Sofia 64, I-95123 Catania, Italy)🇮🇹
We study the universal behavior associated with a Relativistic Boltzmann Transport (RBT) approach with the full collision integral in 0+1D conformal systems. We show that all momentum moments of the distribution function exhibit universal behavior. Furthermore, the RBT approach allows to calculate the full distribution function, showing that an attractor behavior is present in both the longitudinal and transverse momentum dependence. We compare our results to the far-from-equilibrium attractors determined with other approaches, such as kinetic theory in Relaxation Time Approximation (RTA) and relativistic hydrodynamic theories, both in their viscous (DNMR) an anisotropic (aHydro) formulations, finding a very similar evolution, but an even faster thermalization in RBT for higher order moments. For the first time, we extended this analysis also to study the attractor behavior under a temperature-dependent viscosity $η / s (T)$ , accounting also for the rapid increase toward the hadronic phase. We find that a partial breaking of the scaling behavior with respect to $τ / τ_{e q}$ emerges only at $T \approx T_{c}$ generating a transient deviation from attractors; interestingly this in realistic finite systems may occur around the freeze-out dynamics. Finally, we investigate for the first time results beyond the boost-invariant picture, finding that also in such a case the system evolves toward the universal attractor. In particular, we present the forward and pull-back attractors at different space-time rapidities including rapidity regions where initially the distribution function is even vanishing.
↳ hep-phnucl-thEPJC(2024)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE

Exploration of hadronization through heavy flavor production at the future Electron-Ion Collider

Production of Protons and Light Nuclei in Au+Au Collisions at sNN​​ = 3 GeV with the STAR Detector

Rapidity and Energy Dependences of Temperatures and Volume Extracted from Identified Charged Hadron Spectra in Proton-Proton Collisions at a Super Proton Synchrotron (SPS)

Dense QCD2​ with matrix product states

Far-from-equilibrium attractors with Full Relativistic Boltzmann approach in boost-invariant and non-boost-invariant systems

Affiliations

Production of Protons and Light Nuclei in Au+Au Collisions at $s_{NN}$ = 3 GeV with the STAR Detector

Dense $QCD_{2}$ with matrix product states