PaperPanorama
FAQ

Nuclear Theory·nucl-th

Thursday·August 17, 2023

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 06

    [Submitted on 13 Aug 2023] (cross-list from hep-ph)

    , , and other compact states

    Shi-Yuan Li🇨🇳 · Yan-Rui Liu🇨🇳 · Zi-Long Man🇨🇳 · Zong-Guo Si🇨🇳 · Jing Wu🇨🇳

    We study the spectrum and rearrangement decays of S-wave tetraquark states in a simplified quark model. The masses and widths are estimated by assuming that the is the lower tetraquark. Comparing our results with experimental measurements, we find that the recently observed by LHCb can be assigned as the lowest tetraquark state and the could be the second lowest tetraquark. Predictions of ratios between partial widths for the involved tetraquarks are given. We call for searches for more tetraquarks with , , and .

    Comments:
    1 figure
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2308.06768 [pdf]
    CPC(2024)·10 citations
  2. 07

    [Submitted on 14 Aug 2023] (cross-list from hep-ph)

    The spin alignment of vector mesons with light front quarks

    Baochi Fu🇨🇳 · Fei Gao🇨🇳 · Yuxin Liu🇨🇳 · Huichao Song🇨🇳

    The global spin alignment of the vector meson has been observed in relativistic heavy ion collisions, but is still on hot debates in the theoretical community. Here we propose to apply the light front framework to explain this phenomenon since the light front form explicitly describes the hadron spin including both the quark spin and the orbital angular momentum. After applying the light front spinor, we find that the spin alignment in the polarization of vector mesons with can be naturally manifested and in particular, the obtained spin alignment for meson is in good agreement with the experimental data. This implies that to explain the spin alignment it is important to properly include the contribution from the gluon interactions that are presented in terms of the orbital angular momentum of the hadron bound state.

    Comments:
    7 pages, 2 figures, matched to the published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2308.07936 [pdf]
    PLB(2024)·13 citations
  3. 08

    [Submitted on 15 Aug 2023] (cross-list from hep-ph)

    Complete contributions to four-loop pure-singlet splitting functions

    Thomas Gehrmann🇨🇭 · Andreas von Manteuffel🇩🇪 · Vasily Sotnikov🇨🇭 · Tong-Zhi Yang🇨🇭

    The scale evolution of parton distributions is determined by universal splitting functions. As a milestone towards the computation of these functions to four-loop order in QCD, we compute all contributions to the pure-singlet quark-quark splitting functions that involve two closed fermion loops. The splitting functions are extracted from the pole terms of off-shell operator matrix elements, and the workflow for their calculation is outlined. We reproduce known results for the non-singlet four-loop splitting functions and validate our new pure-singlet results against fixed Mellin moments.

    Comments:
    26 pages, 2 figures, journal version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2308.07958 [pdf]
    JHEP(2024)·49 citations
  4. 09

    [Submitted on 16 Aug 2023] (cross-list from hep-ph)

    Chiral kinetic theory with self-energy corrections and neutrino spin Hall effect

    Naoki Yamamoto🇯🇵 · Di-Lun Yang🇹🇼

    We systematically derive the chiral kinetic theory for chiral fermions with collisions, including the self-energy corrections, from quantum field theories. We find that the Wigner functions and chiral kinetic equations receive both the classical and quantum corrections from the self-energies and their spacetime gradients. We also apply this formalism to study nonequilibrium neutrino transport due to the interaction with thermalized electrons and nucleons, as realized in core-collapse supernovae. We derive neutrino currents along magnetic fields and neutrino spin Hall effect induced by the density gradient at first order in the Fermi constant for anisotropic neutrino distributions.

    Comments:
    24 pages, 1 figure, some typos corrected
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2308.08257 [pdf]
    PRD(2024)·12 citations
  5. 10

    [Submitted on 16 Aug 2023] (cross-list from hep-ph)

    Generalized parton distributions of gluon in proton: a light-front quantization approach

    Bolang Lin🇨🇳 · Sreeraj Nair🇨🇳 · Siqi Xu🇨🇳 · Zhi Hu🇨🇳 · Chandan Mondal🇨🇳 · Xingbo Zhao🇨🇳 · James P.Vary🇺🇸

    We solve for the gluon generalized parton distributions (GPDs) inside the proton, focusing specifically on leading twist chiral-even GPDs. We obtain and employ the light-front wavefunctions (LFWFs) of the proton from a light-front quantized Hamiltonian with Quantum Chromodynamics input using basis light-front quantization (BLFQ). Our investigation incorporates the valence Fock sector with three constituent quarks and an additional Fock sector, encompassing three quarks and a dynamical gluon. We examine the GPDs within impact parameter space and evaluate the -dependence of the transverse square radius. We find that the transverse size of the gluon at lower- is larger than that of the quark, while it exhibits opposite behavior at large-. Using the proton spin sum rule, we also determine the relative contributions of quarks and the gluon to the total angular momentum of the proton.

    Comments:
    10 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2308.08275 [pdf]
    PLB(2023)·32 citations
  6. 11

    [Submitted on 16 Aug 2023] (cross-list from astro-ph.HE)

    X-PSI Parameter Recovery for Temperature Map Configurations Inspired by PSR J0030+0451

    Serena Vinciguerra · Tuomo Salmi · Anna L. Watts · Devarshi Choudhury · Yves Kini · Thomas E. Riley

    In the last few years, the NICER collaboration has provided mass and radius inferences, via pulse profile modeling, for two pulsars: PSR J0030+0451 and PSR J0740+6620. Given the importance of these results for constraining the equation of state of dense nuclear matter, it is crucial to validate them and test their robustness. We therefore explore the reliability of these results and their sensitivity to analysis settings and random processes, including noise, focusing on the specific case of PSR J0030+0451. We use X-PSI, one of the two main analysis pipelines currently employed by the NICER collaboration for mass and radius inferences. With synthetic data that mimic the PSR J0030+0451 NICER data set, we evaluate the recovery performances of X-PSI under conditions never tested before, including complex modeling of the thermally emitting neutron star surface. For the test cases explored, our results suggest that X-PSI is capable of recovering the true mass and radius within reasonable credible intervals. This work also reveals the main vulnerabilities of the analysis: a significant dependence on noise and the presence of multi-modal structure in the posterior surface. Noise particularly impacts our sensitivity to the analysis settings and widths of the posterior distributions. The multi-modal structure in the posterior suggests that biases could be present if the analysis is unable to exhaustively explore the parameter space. Convergence testing, to ensure an adequate coverage of the parameter space and a suitable representation of the posterior distribution, is one possible solution to these challenges.

    Comments:
    27 pages, 13 figures
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    2308.08409 [pdf]
    ApJ(2023)·27 citations

Affiliations

first authorsco-authorsvia INSPIRE