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Nuclear Theory·nucl-th

Tuesday·June 18, 2024

14 papers—9 primary·5 cross-listed

All14Primary9Cross-lists5
  1. 10

    [Submitted on 15 Jun 2024] (cross-list from hep-th)

    QCD-Gravity double-copy in the Regge regime: shock wave propagators

    Himanshu Raj🇺🇸 · Raju Venugopalan🇺🇸

    In recent work, we demonstrated a double-copy relation between inclusive gluon radiation in shock wave collisions of ultrarelativistic nuclei and inclusive graviton radiation in trans-Planckian gravitational shock wave collisions. We compute here the corresponding gravitational shock wave propagators in general relativity and demonstrate that they too obey a double copy relation to gluon shock wave propagators computed previously. These results provide key input in a renormalization group approach towards computing the high frequency radiation spectrum in close black hole encounters.

    Comments:
    16 pages, revised version to appear in Physical Review D
    Subjects:
    High Energy Physics — Theory (hep-th); General Relativity and Quantum Cosmology (gr-qc); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2406.10483 [pdf]
    PRD(2024)·8 citations
  2. 11

    [Submitted on 16 Jun 2024] (cross-list from hep-ph)

    Quarkonium fragmentation in a variable-flavor number scheme: Towards NRFF1.0

    Francesco Giovanni Celiberto🇪🇸

    We report progress on the determination and study of quarkonium production within the fragmentation approximation. Our analyses address the moderate and large transverse-momentum regime, where the collinear fragmentation of a single parton is expected to dominate over the short-distance production, directly from the hard scattering, of the constituent system. Parton fragmentation channels to pseudoscalar and vector quarkonia are built on the basis of non-Relativistic QCD next-to-leading computations, which we use to model initial-scale fragmentation inputs. Thus, a preliminary family of Variable-Flavor Number-Scheme (VFNS) fragmentation functions, named NRFF1.0, are constructed through standard DGLAP evolution. Statistical uncertainties are obtained from a Monte Carlo, replica-like approach embodying missing higher-order uncertainties.

    Comments:
    6 pages, 1 figures, proceedings of the 31st International Workshop on Deep Inelastic Scattering (DIS2024), 8-12 April 2024, Grenoble, France
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2406.10779 [pdf]
    PoS(2025)·19 citations
  3. 12

    [Submitted on 16 Jun 2024] (cross-list from hep-ph)

    Isospin QCD as a laboratory for dense QCD

    Toru Kojo🇯🇵 · Daiki Suenaga🇯🇵 · Ryuji Chiba🇯🇵

    QCD with the isospin chemical potential, , is a useful laboratory to delineate the microphysics in dense QCD. To study the quark-hadron-continuity we use a quark-meson model that interpolates hadronic and quark matter physics at microscopic level. The equation of state is dominated by mesons at low density but taken over by quarks at high density. We extend our previous studies with two-flavors to the three-flavors case to study the impact of the strangeness which may be brought by kaons and the U(1) anomaly. In the normal phase the excitation energies of kaons are reduced by in the same way as hyperons in nuclear matter at finite baryon chemical potential. Once pions condense, kaon excitation energies increases as does. Moreover, strange quarks become more massive through the U(1) coupling to the condensed pions. Hence at zero and low temperature the strange hadrons and quarks are highly suppressed. The previous findings in two-flavor models, sound speed peak, negative trace anomaly, gaps insensitve to , persist in our three-flavor model and remain consistent with the lattice results to GeV. We discuss the non-perturbative power corrections and quark saturation effects as important ingredients to understand the crossover equations of state measured on the lattice.

    Comments:
    29 pages,11 figures, a contribution to the Special Issue "Studies in Neutron Stars"
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2406.11059 [pdf]
    Universe(2024)·15 citations
  4. 13

    [Submitted on 17 Jun 2024] (cross-list from cond-mat.quant-gas)

    Universal spectrum of isolated three-body resonances

    Ludovic Pricoupenko🇫🇷

    The exact wavefunction of an isolated three-body resonance at finite scattering length is obtained for two identical particles interacting with another one via a pairwise zero-range potential. The corresponding universal spectrum is studied as a function of the scattering length. The universality of the results is illustrated by considering a model with finite-range interactions.

    Comments:
    19 pages, 11 figures
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    2406.11372 [pdf]
    PRA(2025)·0 citations
  5. 14

    [Submitted on 17 Jun 2024] (cross-list from hep-ph)

    Helicity Evolution at Small : Quark to Gluon and Gluon to Quark Transition Operators

    Jeremy Borden🇺🇸 · Yuri V. Kovchegov🇺🇸 · Ming Li🇺🇸

    We include the quark to gluon and gluon to quark shock-wave transition operators into the small Bjorken- evolution equations for helicity in the flavor-singlet channel derived earlier. While such transitions do not affect the large- version of the evolution equations for helicity, the large- equations are affected. ( and are the numbers of quark colors and flavors, respectively.) We derive the corresponding corrected large- equations for the polarized dipole amplitudes contributing to the flavor-singlet quark and gluon helicity distributions in the double-logarithmic approximation (DLA), resumming powers of with the strong coupling constant. We solve these equations iteratively and extract the polarized splitting functions up to four loops. We show that our splitting functions agree with the fixed-order perturbative calculations up to and including the existing three-loops results. Similar to the large- helicity evolution in the shock-wave approach, our large- small- splitting functions agree with those obtained in the infrared evolution equations framework up to three loops, but appear to slightly disagree at four loops.

    Comments:
    38 pages, 7 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2406.11647 [pdf]
    JHEP(2024)·28 citations

Affiliations

first authorsco-authorsvia INSPIRE