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Nuclear Theory·nucl-th

Wednesday·August 16, 2023

7 papers—4 primary·3 cross-listed

All7Primary4Cross-lists3
  1. 05

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

    Global analysis of polarized DIS & SIDIS data with improved small- helicity evolution

    Daniel Adamiak🇺🇸 · Nicholas Baldonado🇺🇸 · Yuri V. Kovchegov🇺🇸 · W. Melnitchouk🇺🇸 · Daniel Pitonyak🇺🇸 · Nobuo Sato🇺🇸 · Matthew D. Sievert🇺🇸 · Andrey Tarasov🇺🇸 · Yossathorn Tawabutr🇫🇮

    We analyze the world polarized deep-inelastic scattering (DIS) and semi-inclusive DIS (SIDIS) data at low values of , using small- evolution equations for the flavor singlet and nonsinglet helicity parton distribution functions (hPDFs). The hPDFs for quarks, antiquarks, and gluons are extracted and evolved to lower values of to make predictions for the future Electron-Ion Collider (EIC). We improve on our earlier work by employing the more realistic large- limit of the revised small- helicity evolution, and incorporating running coupling corrections along with SIDIS data into the fit. We find an anti-correlation between the signs of the gluon and -even quark hPDFs as well as the structure function. While the existing low- polarized DIS and SIDIS data are insufficient to constrain the initial conditions for the polarized dipole amplitudes in the helicity evolution equations, future EIC data will allow more precise predictions for hPDFs and the structure function for values beyond those probed at the EIC. Using the obtained hPDFs, we discuss the contributions to the proton spin from quark and gluon spins at small .

    Comments:
    42 Pages, 21 Figures,
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2308.07461 [pdf]
    PRD(2023)·32 citations
  2. 06

    [Submitted on 14 Aug 2023] (cross-list from astro-ph.CO)

    The Scale Invariant Vacuum Paradigm: Main Results plus the Current BBNS Progress

    Vesselin G. Gueorguiev · Andre Maeder

    We summarize the main results within the Scale Invariant Vacuum (SIV) paradigm as related to the Weyl Integrable Geometry (WIG) as an extension to the standard Einstein General Relativity (EGR). After a short sketch of the mathematical framework, the main results until 2023 [1] are highlighted in relation to: the inflation within the SIV [2], the growth of the density fluctuations [3], the application of the SIV to scale-invariant dynamics of galaxies, MOND, dark matter, and the dwarf spheroidals [4],and the most recent results on the BBNS light-elements' abundances within the SIV [5]. Keywords: cosmology: theory, dark matter, dark energy, inflation, BBNS; galaxies: formation, rotation; Weyl integrable geometry; Dirac co-calculus.

    Comments:
    10 pages, 3 figures, 2 tables; Comments and constructive suggestions are highly welcome. Presentation slides are available at ResearchGate.net via the link www.researchgate.net/publication/362388677; Contribution to the Relativity Theory conference at the Bauman Moscow State Technical University, Moscow, 4 July, 2023 (PIRT-2023 https://pirt.bmstu.ru/en/home-en/);. arXiv admin note: substantial text overlap with arXiv:2202.08412
    Subjects:
    Cosmology and Nongalactic Astrophysics (astro-ph.CO); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2308.07483 [pdf]
    0 citations
  3. 07

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

    New insights into the nature of the and resonances away from the SU(3) limit

    Feng-Kun Guo🇨🇳 · Yuki Kamiya🇩🇪 · Maxim Mai🇩🇪 · Ulf-G. Meißner🇩🇪

    Starting from the SU(3) limit, we consider the nature of the dynamically generated resonances , and as the pion and kaon masses are tuned to their physical values. We show that the accidental symmetry of the two octets due to the leading order Weinberg-Tomozawa term is broken by the next-to-leading order terms. Most interestingly, we observe an interchange of the two trajectories of the and the away from the SU(3) limit at next-to-leading order. This remarkable phenomenon can be investigated using lattice QCD calculations that start from the SU(3) limit.

    Comments:
    We have updated the notation compared to the journal version. No calculation or results are changed by this, 11 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2308.07658 [pdf]
    PLB(2023)·34 citations

Affiliations

first authorsco-authorsvia INSPIRE