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Nuclear Theory·nucl-th

Monday·March 27, 2023

7 papers—3 primary·4 cross-listed

All7Primary3Cross-lists4
  1. 04

    [Submitted on 23 Mar 2023] (cross-list from hep-ph)

    The isospin-3 three-particle -matrix at NLO in ChPT

    Jorge Baeza-Ballesteros (IFIC, Valencia)🇪🇸 · Johan Bijnens (Lund U.)🇸🇪 · Tomáš Husek (Lund U. and Charles U.)🇨🇿 · Fernando Romero-López (MIT)🇺🇸 · Stephen R. Sharpe (Washington U.)🇺🇸 · Mattias Sjö (Lund U.)🇸🇪

    The three-particle -matrix, , is a scheme-dependent quantity that parametrizes short-range three-particle interactions in the relativistic-field-theory three-particle finite-volume formalism. In this work, we compute its value for systems of three pions at maximal isospin through next-to-leading order (NLO) in Chiral Perturbation Theory (ChPT). We compare the values to existing lattice QCD results and find that the agreement between lattice QCD data and ChPT in the first two coefficients of the threshold expansion of is significantly improved with respect to leading order once NLO effects are incorporated.

    Comments:
    57 pages, 12 figures, 2 tables; v2: added sec. 2.3, minor changes, typos corrected, conclusions unchanged, version published in JHEP
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2303.13206 [pdf]
    JHEP(2023)·25 citations
  2. 05

    [Submitted on 23 Mar 2023] (cross-list from hep-ph)

    High-energy neutrino deep inelastic scattering cross sections

    Keping Xie🇺🇸 · Jun Gao🇨🇳 · T. J. Hobbs🇺🇸 · Daniel R. Stump🇺🇸 · C.-P. Yuan🇺🇸

    We present a state-of-the-art prediction for cross sections of neutrino deep inelastic scattering (DIS) from nucleon at high neutrino energies, , from 100 GeV to 1000 EeV ( GeV). Our calculations are based on the latest CT18 NNLO parton distribution functions (PDFs) and their associated uncertainties. In order to make predictions for the highest energies, we extrapolate the PDFs to small according to several procedures and assumptions, thus affecting the uncertainties at ultra-high ; we quantify the uncertainties corresponding to these choices. Similarly, we quantify the uncertainties introduced by the nuclear corrections which are required to evaluate neutrino-nuclear cross sections for neutrino telescopes. These results can be applied to currently-running astrophysical neutrino observatories, such as IceCube and KM3NeT, as well as various future experiments which have been proposed.

    Comments:
    57 pages, 27 figures, and 2 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2303.13607 [pdf]
    PRD(2024)·34 citations
  3. 06

    [Submitted on 23 Mar 2023] (cross-list from hep-ph)

    Small- Factorization from Effective Field Theory

    Duff Neill🇺🇸 · Aditya Pathak🇺🇸 · Iain Stewart🇺🇸

    We derive a factorization theorem that allows for resummation of small- logarithms by exploiting Glauber operators in the soft collinear effective field theory. Our analysis is carried out for the hadronic tensor in deep inelastic scattering, and leads to the definition of a new gauge invariant soft function that describes quark and gluon emission in the central region. This soft function provides a new framework for extending resummed calculations for coefficient functions to higher logarithmic orders. Our factorization also defines impact factors by universal collinear functions that are process independent, for instance being identical in small- DIS and Drell-Yan.

    Comments:
    43 pgs
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2303.13710 [pdf]
    JHEP(2023)·13 citations
  4. 07

    [Submitted on 23 Mar 2023] (cross-list from astro-ph.HE)

    A tight universal relation between the shape eccentricity and the moment of inertia for rotating neutron stars

    Yong Gao · Lijing Shao · Jan Steinhoff

    Universal relations that are insensitive to the equation of state (EoS) are useful in reducing the parameter space when measuring global quantities of neutron stars (NSs). In this paper, we reveal a new universal relation that connects the eccentricity to the radius and moment of inertia of rotating NSs. We demonstrate that the universality of this relation holds for both conventional NSs and bare quark stars (QSs) in the slow rotation approximation, albeit with different relations. The maximum relative deviation is approximately for conventional NSs and for QSs. Additionally, we show that the universality still exists for fast-rotating NSs if we use the dimensionless spin to characterize their rotation. The new universal relation will be a valuable tool to reduce the number of parameters used to describe the shape and multipoles of rotating NSs, and it may also be used to infer the eccentricity or moment of inertia of NSs in future X-ray observations.

    Comments:
    7 pages, 5 figures; accepted by ApJ
    Subjects:
    High Energy Astrophysical Phenomena (astro-ph.HE); General Relativity and Quantum Cosmology (gr-qc); Nuclear Theory (nucl-th)
    arXiv:
    2303.14130 [pdf]
    ApJ(2023)·9 citations

Affiliations

first authorsco-authorsvia INSPIRE