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Nuclear Theory·nucl-th

Thursday·October 27, 2022

9 papers—5 primary·4 cross-listed

All9Primary5Cross-lists4
  1. 06

    [Submitted on 25 Oct 2022] (cross-list from hep-ph)

    Numerical study of the twist-3 asymmetry in single-inclusive electron-nucleon and proton-proton collisions

    Brandon Bauer🇺🇸 · Daniel Pitonyak🇺🇸 · Cody Shay🇺🇸

    We provide the first rigorous numerical analysis of the longitudinal-transverse double-spin asymmetry in electron-nucleon and proton-proton collisions for the case where only a single pion, jet, or photon is detected in the final state. Given recent extractions of certain, previously unknown, non-perturbative functions, we are able to compute contributions from all terms relevant for and make realistic predictions for the observable at Jefferson Lab (JLab) 12 GeV, COMPASS, the future Electron-Ion Collider, and the Relativistic Heavy Ion Collider. We also compare our results to a JLab 6 GeV measurement, which are the only data available for this type of reaction. The twist-3 nature of makes it a potentially fruitful avenue to probe quark-gluon-quark correlations in hadrons as well as provide insights into dynamical quark mass generation in QCD.

    Comments:
    21 pages, 14 figures, very minor changes, 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:
    2210.14334 [pdf]
    PRD(2023)·7 citations
  2. 07

    [Submitted on 25 Oct 2022] (cross-list from nucl-ex)

    Understanding the cosmic abundance of Na: lifetime measurements in Mg

    C. Fougères (GANIL, ANL) · F. de Oliveira Santos (GANIL) · N. A. Smirnova (LP2IB) · C. Michelagnoli (GANIL, ILL) · GANIL-E710/AGATA collaborations

    Simulations of explosive nucleosynthesis in novae predict the production of Na, a key astronomical observable to constrain nova models. Its gamma-ray line at 1.275 MeV has not yet been observed by the gamma-ray space telescopes. The Ne/Ne ratio in presolar grains, a possible tool to identify nova grains, also depends on Na produced. Uncertainties on its yield in classical novae currently originate from the rate of the Na(p, )Mg reaction. At peak novae temperatures, this reaction is dominated by a resonance at E=0.204 MeV, corresponding to the =7.785 MeV excited state in Mg. The resonance strengths measured so far disagree by one order of magnitude. An experiment has been performed at GANIL to measure the lifetime and the proton branching ratio of this key state, with a femtosecond resolution for the former. The reactions populating states in Mg have been studied with a high resolution detection set-up, i.e. the particle VAMOS, SPIDER and gamma tracking AGATA spectrometers, allowing the measurements of lifetimes and proton branchings. We present here a comparison between experimental results and shell-model calculations, that allowed us to assign the spin and parity of the key state. Rather small values obtained for reduced matrix elements, , and proton spectroscopic factors, <10, seem to be beyond the accuracy of the shell model. With the reevaluated Na(p, )Mg rate, the Na detectability limit and its observation frequency from novae are found promising for the future space telescopes.

    Comments:
    6 pages, 4 figures, proceedings of the conference Nuclear Physics in Astrophysics - X (NPA-X, Cern 2022), accepted in EPJ Web of Conferences
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Astrophysical Phenomena (astro-ph.HE); Solar and Stellar Astrophysics (astro-ph.SR); Nuclear Theory (nucl-th)
    arXiv:
    2210.14336 [pdf]
    EPJ Web Conf.(2023)·1 citation
  3. 08

    [Submitted on 25 Oct 2022] (cross-list from hep-lat)

    Bump of sound velocity in dense 2-color QCD

    Etsuko Itou🇯🇵 · Kei Iida🇯🇵

    We obtain the equation of state (EoS) and the sound velocity for 2-color QCD at low temperature and high density and find that in the superfluid phase, , where is the value at the relativistic limit. Several independent Monte Carlo studies on 2-color QCD have been conducted intensively in recent years. These works have shown a clear evidence of phase transition between hadronic and superfluid phases. In our paper[1], we have investigated the EoS and sound velocity in both phases. Our result is consistent with chiral perturbation theory in a low regime of the superfluid phase including the Bose-Einstein condensed phase, and shows a peak of sound velocity in the high-density BCS phase. We also give detailed simulation results and a comment on the holography bound in this proceedings.

    Comments:
    9pages, 5figures, Proceedings of the 39th International Symposium on Lattice Field Theory,8th-13th August 2022, Rheinische Friedrich-Wilhelms-Universität Bonn, Bonn, Germany. arXiv admin note: substantial text overlap with arXiv:2207.01253
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2210.14385 [pdf]
    PoS(2023)·7 citations
  4. 09

    [Submitted on 26 Oct 2022] (cross-list from astro-ph.HE)

    (Anti)kaon condensation in strongly magnetized dense matter

    Debraj Kundu🇮🇳 · Vivek Baruah Thapa🇮🇳 · Monika Sinha🇮🇳

    Recent observations of several massive pulsars, with masses near and above , point towards the existence of matter at very high densities, compared to normal matter that we are familiar with in our terrestrial world. This leads to the possibility of appearance of exotic degrees of freedom other than nucleons inside the core of the neutrons stars (NS). Another significant property of NSs is the presence of high surface magnetic field, with highest range of the order of G. We study the properties of highly dense matter with the possibility of appearance of heavier strange and non-strange baryons, and kaons in presence of strong magnetic field. We find that the presence of a strong magnetic field stiffens the matter at high density, delaying the kaon appearance and, hence, increasing the maximum attainable mass of NS family.

    Comments:
    16 pages, 10 figures; accepted for publication in Phys. Rev. C
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    2210.14565 [pdf]
    PRC(2023)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE