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Nuclear Theory·nucl-th

Wednesday·January 29, 2025

7 papers—1 primary·6 cross-listed

All7Primary1Cross-lists6
  1. 02

    Hybrid Hadronization -- A Study of In-Medium Hadronization of Jets

    A. Sengupta🇺🇸 · R. J. Fries🇺🇸 · M. Kordell II🇺🇸 · B. Kim🇺🇸 · A. Angerami🇺🇸 · R. Arora🇺🇸 · S. A. Bass🇺🇸 · Y. Chen🇺🇸 · R. Datta🇺🇸 · L. Du🇨🇦 · R. Ehlers🇺🇸 · H. Elfner🇩🇪 and 41 other authors

    QCD jets are considered important probes for quark gluon plasma created in collisions of nuclei at high energies. Their parton showers are significantly altered if they develop inside of a deconfined medium. Hadronization of jets is also thought to be affected by the presence of quarks and gluons. We present a systematic study of the effects of a thermal bath of partons on the hadronization of parton showers. We use the JETSCAPE framework to create parton showers both in vacuum and in a brick of quark gluon plasma. The brick setup allows important parameters, like the size of the plasma as well as the collective flow of partons, to be varied systematically. We hadronize the parton showers using Hybrid Hadronization, which permits shower partons to form strings with thermal partons, or to recombine directly with thermal partons as well as with each other. We find a sizeable amount of interaction of shower partons with thermal partons during hadronization, indicating a natural continuation of the interaction of jet and medium during this stage. The observed effects grow with the size of the medium. Collective flow easily transfers from the thermal partons onto the emerging jet hadrons. We also see a significant change in hadron chemistry as expected in the presence of quark recombination processes.

    ↳ hep-phnucl-exnucl-th8 citations
  2. 03

    Polarized Dissociation and Spin Alignment of Moving Quarkonium in Quark-Gluon Plasma

    Zhishun Chen🇨🇳 · Shu Lin🇨🇳

    Recent experiments have found spin alignment of with respect to event plane in heavy ion collisions, suggesting a medium effect that is spin dependent. We propose a possible mechanism with polarized dissociation from the motion of with respect to the medium. We calculate polarized dissociation rate for quarkonium spin triplet state from spin chromomagnetic coupling in the potential non-relativistic QCD framework. This is done for the leading order gluo-dissociation process and next to leading order inelastic Coulomb scattering process. The polarized dissociation rate is expressed as a function of relative velocity between quarkonium and QGP and the quantization axis. Applying the polarized dissociation rate to quarkonium evolution with dissociation effect only in a Bjorken flow, we find the spin state to dissociate less than the other spin states, leading to positive . Regeneration contribution is expected to give a contribution with the opposite sign.

    ↳ hep-phnucl-exnucl-thPRD(2025)·5 citations
  3. 04

    Confined Monopoles in Chiral Bag

    Fan Lin🇨🇳 · Yong-Liang Ma🇨🇳

    The chiral bag model offers a dual description of hadron physics in terms of quarks and hadrons in the sense of Cheshire Cat principle. In this work, we find that, within the chiral bag, confinement is likely caused by monopole condensation. The chiral bag surface can be interpreted as an domain wall, where a dynamical Chern-Simons theory emerges. Under level-rank duality, the Chern-Simons theory serves as the counterterm introduced to block the so-called color charge leakage. To ensure the correct net baryon number of the full chiral bag, an additional Chern-Simons theory involving the vector meson field arises on the bag surface and extends outside the bag. This leads to a Chern-Simons-Higgs theory localized on the domain wall, as previously conjectured. We also propose that the skyrmion description of baryons could be understood as a system of monopoles enveloped by a meson cloud.

    ↳ hep-phhep-thnucl-thPRD(2025)·2 citations
  4. 05

    Effect of nuclear medium on the spatial distribution of pions

    Satyajit Puhan🇮🇳 · Navpreet Kaur🇮🇳 · Arvind Kumar🇮🇳 · Suneel Dutt🇮🇳 · Harleen Dahiya🇮🇳

    We calculate the valence quark generalized parton distributions (GPDs) of the lightest pseudoscalar meson, pion, in an isospin asymmetric nuclear matter at zero temperature by employing a light-cone quark model. The medium modifications in the unpolarized GPDs have been incorporated by taking inputs from the chiral SU() quark mean field model. The electromagnetic form factors (EMFFs) and charge radii have been calculated for both the vacuum and in-medium cases. These results are found to be in agreement with the available experimental data and other model predictions.

    ↳ hep-phnucl-thNPB(2025)·7 citations
  5. 06

    Left-hand cut and the HAL QCD method

    Sinya Aoki🇯🇵 · Takumi Doi🇯🇵 · Yan Lyu🇯🇵

    We investigate how the left-hand cut (LHC) problem is treated in the HAL QCD method. For this purpose, we first consider the effect of the LHC to the scattering problem in non-relativistic quantum mechanics with potentials. We show that the -matrix or the scattering phase shift obtained from the potential including the Yukawa term () with the infra-red (IR) cutoff is well-defined even for the complex momentum as long as is finite, and they are compared with those obtained by the analytic continuation without the IR cutoff. In the limit, the phase shift approaches the result from the analytic continuation at , while they differ at , except , where is the binding momentum. We also observe that can be correctly obtained even at finite but large . Using knowledge obtained in the non-relativistic quantum mechanics, we present how we should treat the LHC in the HAL QCD potential method.

    ↳ hep-lathep-phnucl-thPoS(2025)·10 citations
  6. 07

    Goldstone bosons at non-zero temperature

    Peter Lowdon🇩🇪 · Owe Philipsen🇩🇪

    Spontaneous symmetry breaking in quantum field theories at non-zero temperature still holds fundamental open questions, in particular what happens to vacuum Goldstone bosons when the temperature is increased. By investigating a complex scalar field theory on the lattice we demonstrate that Goldstone bosons at non-zero temperature behave like screened massless particle-like excitations, so-called thermoparticles, which continue to exist even in the symmetry-restored phase of the theory. We provide non-perturbative evidence for the functional form of the Goldstone mode's dissipative behaviour, and determine its corresponding spectral properties. Since the persistence of thermal Goldstone modes within symmetry-restored phases is predicted to be a model-independent characteristic, this has fundamental consequences for systems in which continuous symmetries are restored at high temperatures.

    ↳ hep-phhep-lathep-thnucl-thPRD(2025)·5 citations

Affiliations

first authorsco-authorsvia INSPIRE