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Nuclear Theory·nucl-th

Monday·December 13, 2021

11 papers—5 primary·6 cross-listed

All11Primary5Cross-lists6
  1. 06

    [Submitted on 8 Dec 2021] (cross-list from cond-mat.quant-gas)

    Vortices in spin-0 superfluids carry magnetic flux

    Aleksey Cherman🇺🇸 · Theodore Jacobson🇺🇸 · Srimoyee Sen🇺🇸 · Laurence G. Yaffe🇺🇸

    Vortices in spin- superfluids generically carry magnetic fields inside their cores, so that even neutral superfluid vortices may be thought of as magnetic flux tubes. We give a systematic analysis of this `vortex magnetic effect' using effective field theory, clarifying earlier literature on the subject. Our analysis shows that in superfluid Helium- the vortex magnetic effect may be large enough to be experimentally detectable.

    Comments:
    v2: corrected an error which does not change the conclusion, improved exposition
    Subjects:
    Quantum Gases (cond-mat.quant-gas); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2112.04595 [pdf]
    PRB(2023)·1 citation
  2. 07

    [Submitted on 9 Dec 2021] (cross-list from hep-ph)

    The LPM effect in sequential bremsstrahlung: analytic results for sub-leading (single) logarithms

    Peter Arnold🇺🇸 · Tyler Gorda🇩🇪 · Shahin Iqbal🇨🇳

    Consider the in-medium splitting of a very high-energy gluon traversing a QCD medium, accounting for the Landau-Pomeranchuk-Migdal (LPM) effect. It has been known for some time that soft radiative corrections to that splitting generate a double-log correction to the splitting rate, whose effects can be absorbed into running of the medium parameter describing the rate of transverse momentum kicks to high-energy particles due to small-angle scattering from the medium. Less has been known about sub-leading, single logarithms in this context. In this paper, we find analytic formulas for those single logs (with various caveats and clarifications).

    Comments:
    54 pages, 20 figures. Chages from v1 are superficial -- mostly a slight expansion of the introduction and conclusion
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2112.05161 [pdf]
    JHEP(2022)·30 citations
  3. 08

    [Submitted on 9 Dec 2021] (cross-list from hep-lat)

    Three-particle scattering amplitudes from lattice QCD

    Fernando Romero-López🇺🇸

    Lattice QCD already offers the possibility of extracting three-hadron scattering quantities from first principles. In the last few years, significant progress has been achieved in developing and applying the finite-volume three-body formalism. The formalism is now able to treat physically relevant systems of three mesons, including those with resonances, as well as three-body decays. In this talk, I will review the state of the art, and comment on recent applications to lattice QCD data for systems of three pions and kaons.

    Comments:
    Invited plenary talk at the Hadron 2021 conference. 9 pages, 8 figures
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2112.05170 [pdf]
    Rev.Mex.Fis.Suppl.(2022)·13 citations
  4. 09

    [Submitted on 10 Dec 2021] (cross-list from hep-lat)

    Non-perturbative thermal QCD at all temperatures: the case of mesonic screening masses

    Mattia Dalla Brida🇨🇭 · Leonardo Giusti🇮🇹 · Tim Harris🇬🇧 · Davide Laudicina🇮🇹 · Michele Pepe🇮🇹

    We present a strategy based on the step-scaling technique to study non-perturbatively thermal QCD up to very high temperatures. As a first concrete application, we compute the flavour non-singlet meson screening masses at 12 temperatures covering the range from GeV up to GeV in the theory with three massless quarks. The calculation is carried out by Monte Carlo simulations on the lattice by considering large spatial extensions in order to have negligible finite volume effects. For each temperature we have simulated 3 or 4 values of the lattice spacing, so as to perform the continuum limit extrapolation with confidence at a few permille accuracy. Chiral symmetry restoration manifests itself in our results through the degeneracy of the vector and the axial vector channels and of the scalar and the pseudoscalar ones. In the entire range of temperatures explored, the meson screening masses deviate from the free theory result, , by at most a few percent. These deviations, however, cannot be explained by the known leading term in the QCD coupling constant up to the highest temperature, where other contributions are still very relevant. In particular the vector-pseudoscalar mass splitting turns out to be of in the entire range explored, and it remains clearly visible up to the highest temperature, where the two screening masses are still significantly different within our numerical precision. The pattern of different contributions that we have found explains why it has been difficult in the past to match non-perturbative lattice results at GeV with the analytic behaviour at asymptotically high temperatures.

    Comments:
    32 pages, 5 figures. V2 typos corrected, minor modifications in the text, version to appear on JHEP
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2112.05427 [pdf]
    JHEP(2022)·50 citations
  5. 10

    [Submitted on 10 Dec 2021] (cross-list from hep-ph)

    Gluon and valence quark distributions for the pion and kaon in nuclear matter

    Parada T.P. Hutauruk🇰🇷 · Seung-il Nam🇰🇷

    In this paper we study the gluon and valence quark distributions in the pion and kaon in nuclear medium for various nuclear densities as well as in vacuum within the Nambu--Jona-Lasinio (NJL) model with the help of the proper-time regularization scheme which simulates a confinement of QCD. The nuclear medium effect is also determined in the same model for the symmetric nuclear matter. We then analyze the gluon and valence quark distributions for the bound pion and kaon in symmetric nuclear matter as well as those in vacuum. We find that the valence quark and gluon distributions in vacuum have relatively good agreements with the experimental data, the lattice QCD simulations, and the JAM Monte-Carlo (MC) global fit QCD analysis. Evolving to the higher factorization scale 4 GeV, the in-medium gluon and valence-quark distributions of the pion for various nuclear densities are turned out to be almost unchanged in comparison to the vacuum cases. On the contrary, for the kaon, they increase significantly with respect to the densities. Finally, we find that the vacuum gluon distribution for the kaon is smaller than that for the pion, which is consistent with other theoretical predictions. This feature holds for the in-medium gluon distribution in the nuclear density up to the saturation density.

    Comments:
    10 pages, 15 figures, published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2112.05435 [pdf]
    PRD(2022)·18 citations
  6. 11

    [Submitted on 10 Dec 2021] (cross-list from hep-lat)

    First Lattice QCD Study of Proton Twist-3 GPDs

    Shohini Bhattacharya🇸🇪 · Krzysztof Cichy🇺🇸 · Martha Constantinou🇵🇱 · Jack Dodson🇫🇷 · Andreas Metz🇸🇪 · Aurora Scapellato🇺🇸 · Fernanda Steffens🇩🇪

    We present first results on selected twist-3 quark GPDs using the quasi-distribution method. This approach relates lattice QCD data and light-cone distribution functions using Large Momentum Effective Theory (LaMET). We calculate quark-antiquark correlators of boosted nucleons coupled to non-local operators with vector and axial Dirac structure, which is transverse to the momentum boost. We use three values of the momentum boost, namely 0.83, 1.25, 1.67 GeV. The GPDs are defined in the symmetric (Breit) frame, which we implement here with 4-vector momentum transfer squared of 0, 0.69 and 1.39 GeV 2 , all at zero skewness. The calculation is performed using one ensemble of two degenerate light, a strange and a charm quark ( = 2 + 1 + 1) of maximally twisted mass fermions with a clover term, corresponding to a pion mass of 260 MeV.

    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2112.05538 [pdf]
    PoS(2022)·25 citations

Affiliations

first authorsco-authorsvia INSPIRE