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Nuclear Theory·nucl-th

Wednesday·February 1, 2023

6 papers—3 primary·3 cross-listed

All6Primary3Cross-lists3
  1. 04

    [Submitted on 30 Jan 2023] (cross-list from hep-ph)

    Extraction of neutron density distributions from high-statistics coherent elastic neutrino-nucleus scattering data

    D. Aristizabal Sierra🇨🇱

    Forthcoming fixed-target coherent elastic neutrino-nucleus scattering experiments aim at measurements with -scale detectors and substantially reduced systematic and statistical uncertainties. With such high quality data, the extraction of point-neutron distributions mean-square radii requires a better understanding of possible theoretical uncertainties. We quantify the impact of single-nucleon electromagnetic mean-square radii on the weak-charge form factor and compare results from weak-charge form factor parametrizations and weak-charge form factor decompositions in terms of elastic vector proton and neutron form factors, including nucleon form factors -dependent terms up to order . We assess as well the differences arising from results derived using weak-charge form factor decompositions in terms of elastic vector proton and neutron form factors and a model-independent approach based solely on the assumption of spherically symmetric nuclear ground state. We demonstrate the impact of the main effects by assuming pseudo-data from a one-tonne LAr detector and find that, among the effects and under the assumptions considered in this paper, weak-charge form factor parametrizations and weak-charge form factor decompositions in terms of elastic vector proton and neutron form factors enable the extraction of the point-neutron distribution mean-square radius with a accuracy. With a substantial reduction of the beam-related neutron and steady-state backgrounds a precision extraction seems feasible, using either of the two approaches.

    Comments:
    14 pages, 7 figures, 1 table. A few clarifications added. Matches version published in PLB
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2301.13249 [pdf]
    PLB(2023)·14 citations
  2. 05

    [Submitted on 31 Jan 2023] (cross-list from hep-ph)

    Perfect QCD -- a new Universal approach to soft QCD

    Peter Christiansen🇸🇪

    The ideas presented in this proceeding aims to be a first step towards a description of hadronic collisions where all soft processes are fundamentally strongly coupled and the same Universal strongly coupled physics drives both initial and final-state interactions. As it is not currently possible to derive such a picture from first principles, instead, an attempt to generalize the perfect liquid observation to a ``perfect QCD'' guiding principle is presented, focusing on implications for particle production in small systems. The first steps towards a microscopic model is taken by arguing that ``perfect QCD'' suggests that the screening in the initial state is so large that multi-parton interactions are of little or no importance. Instead, a target and projectile remnant is coherently excited and particle production is mainly driven by radiation in a qualitative similar manner as . Finally, some of the possible implications of this ``excited remnant model'' are presented. It is argued that the time ordering of soft and hard physics can explain the absence of jet quenching in small systems and that the coherence scale of the projectile and target provides insights into what small systems will exhibit flow.

    Comments:
    6 pages, 2 figures. Proceeding for WWND 2022
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2301.13467 [pdf]
    Rev.Mex.Fis.Suppl.(2022)·0 citations
  3. 06

    [Submitted on 31 Jan 2023] (cross-list from hep-ph)

    QCD equation of state at finite isospin density from the linear sigma model with quarks: The cold case

    Alejandro Ayala🇲🇽 · Aritra Bandyopadhyay🇧🇷 · Ricardo L. S. Farias🇧🇷 · Luis A. Hernández🇿🇦 · José Luis Hernández🇪🇸

    We use the two-flavor linear sigma model with quarks to study the phase structure of isospin asymmetric matter at zero temperature. The meson degrees of freedom provide the mean field chiral- and isospin-condensates on top of which we compute the effective potential accounting for constituent quark fluctuations at one-loop order. Using the renormalizability of the model, we absorb the ultraviolet divergences into suitable counter-terms that are added respecting the original structure of the theory. These counter-terms are determined from the stability conditions which require the effective potential to have minima in the condensates directions at the classical values, as well as the transition from the non-condensed to the condensed phase to be smooth as a function of the isospin chemical potential. We use the model to study the evolution of the condensates as well as the pressure, energy and isospin densities and the sound velocity as functions of the isospin chemical potential. The approach does a good average description up to isospin chemical potentials values not too large as compared to the vacuum pion mass.

    Comments:
    11 pages and 7 figures. Expanded discussion, references and graphs added, conclusions unchanged
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    2301.13633 [pdf]
    PRD(2023)·28 citations

Affiliations

first authorsco-authorsvia INSPIRE