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Nuclear Theory·nucl-th

Friday·August 5, 2022

10 papers—6 primary·4 cross-listed

All10Primary6Cross-lists4
  1. 07

    [Submitted on 3 Aug 2022] (cross-list from hep-lat)

    Continuum-extrapolated NNLO Valence PDF of Pion at the Physical Point

    Xiang Gao🇺🇸 · Andrew D. Hanlon🇺🇸 · Nikhil Karthik🇺🇸 · Swagato Mukherjee🇺🇸 · Peter Petreczky🇺🇸 · Philipp Scior🇺🇸 · Shuzhe Shi🇺🇸 · Sergey Syritsyn🇺🇸 · Yong Zhao🇺🇸 · Kai Zhou🇩🇪

    We present lattice QCD calculations of valence parton distribution function (PDF) of pion employing next-to-next-leading-order (NNLO) perturbative QCD matching. Our calculations are based on three gauge ensembles of 2+1 flavor highly improved staggered quarks and Wilson--Clover valance quarks, corresponding to pion mass ~MeV at a lattice spacing ~fm and ~MeV at ~fm. This enables us to present, for the first time, continuum-extrapolated lattice QCD results for NNLO valence PDF of the pion at the physical point. Applying leading-twist expansion for renormalization group invariant (RGI) ratios of bi-local pion matrix elements with NNLO Wilson coefficients we extract , and Mellin moments of the PDF. We reconstruct the Bjorken- dependence of the NNLO PDF from real-space RGI ratios using a deep neural network (DNN) as well as from momentum-space matrix elements renormalized using a hybrid-scheme. All our results are in broad agreement with the results of global fits to the experimental data carried out by the xFitter and JAM collaborations.

    Comments:
    25 pages, 29 figures, version published in PRD
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2208.02297 [pdf]
    PRD(2022)·77 citations
  2. 08

    [Submitted on 4 Aug 2022] (cross-list from hep-ph)

    Cornell potential in generalized Soft Wall holographic model

    Sergey Afonin🇷🇺 · Timofey Solomko🇷🇺

    We derive and analyze the confinement potential of the Cornell type within the framework of the generalized Soft Wall holographic model that includes a parameter controlling the intercept of the linear Regge spectrum. In the phenomenology of Regge trajectories, this parameter is very important for the quantitative description of experimental data. Our analysis shows that the ''linear plus Coulomb'' confinement potential obtained in the scalar channel is quantitatively consistent with the phenomenology and lattice simulations while the agreement in the vector channel is qualitative only. This result indicates the key role of the vacuum scalar sector in the formation of the confinement potential. As a by-product the overall consistency of our holographic description of confinement potential seems to confirm the glueball nature of the scalar meson .

    Comments:
    25 pages, 8 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2208.02604 [pdf]
    J.Phys.G(2022)·10 citations
  3. 09

    [Submitted on 4 Aug 2022] (cross-list from hep-th)

    Tricritical phenomena in holographic chiral phase transitions

    Masataka Matsumoto🇨🇳

    We study critical phenomena at a tricritical point associated with a chiral phase transition which emerges in the D3/D7 model in the presence of a finite baryon number density and an external magnetic field. We numerically determine critical exponents related to the thermodynamic quantities and correlation functions. We find that the values of the critical exponents agree with the mean-field values. The scaling relations between the critical exponents are satisfied, implying that the scaling hypothesis for the free energy and the correlation functions hold. Our results indicate that the critical phenomena at the tricritical point in the D3/D7 model are well described by the conventional Landau theory.

    Comments:
    v1: 34 pages, 16 figures; v2: version published in JHEP
    Subjects:
    High Energy Physics — Theory (hep-th); Statistical Mechanics (cond-mat.stat-mech); Strongly Correlated Electrons (cond-mat.str-el); Nuclear Theory (nucl-th)
    arXiv:
    2208.02605 [pdf]
    JHEP(2022)·3 citations
  4. 10

    [Submitted on 4 Aug 2022] (cross-list from hep-ph)

    Semi-inclusive electroproduction of hidden-charm and double-charm hadronic molecules

    Pan-Pan Shi🇨🇳 · Feng-Kun Guo🇨🇳 · Zhi Yang🇨🇳

    The semi-inclusive electroproduction of exotic hadrons, including the , , and hidden-charm baryon-antibaryon states, is explored under the assumption that they are -wave hadronic molecules of a pair of charmed hadrons. We employ the Monte Carlo event generator Pythia to produce the hadron pairs and then bind them together to form hadronic molecules. With the use of such a production mechanism, the semi-inclusive electroproduction rates are estimated at the order-of-magnitude level. Our results indicate that a larger number of states and molecules can be produced at the proposed electron-ion colliders in China (EicC) and in the US (EIC). The results also suggest that the states and other hidden-charm baryon-antibaryon states can be searched for at EIC. Besides, the potential 24-GeV upgrade of the Continuous Beam Accelerator Facility at the Thomas Jefferson National Accelerator Facility can play an important role in the search for the hidden-charm tetraquark and pentaquark states due to its high luminosity.

    Comments:
    20 pages, 4 figures. Version to appear in PRD
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2208.02639 [pdf]
    PRD(2022)·14 citations

Affiliations

first authorsco-authorsvia INSPIRE