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Nuclear Theory·nucl-th

Thursday·December 19, 2024

9 papers—2 primary·7 cross-listed

All9Primary2Cross-lists7
  1. 03

    [Submitted on 17 Dec 2024] (cross-list from hep-ph)

    Neutrino nucleus Quasi-Elastic and resonant Neutral Current scatterings with Non-Standard Interactions

    Saeed Abbaslu🇮🇷 · Mehran Dehpour🇨🇿 · Yasaman Farzan🇮🇷 · Sahar Safari🇩🇪

    As well known, the cross sections of the resonance and Quasi-Elastic (QE) scattering off nucleons depend on quantities known as form factors that describe the nucleon structure. There are alternative approaches to determine the values of these non-perturbative quantities, some of them relying on the Neutral Current (NC) scattering of neutrinos off nucleons. In the presence of NC Non-Standard Interactions (NSI), such derivations must be revisited. The aim of the present paper is to discuss how information on NSI can be extracted by combining alternative approaches for deriving the form factors. We discuss how the KamLAND atmospheric neutrino data with (used to determine the axial strange form factor ) can already constrain the axial NSI of with nucleons. We also argue that if the precision measurement of NC QE scattering establishes unexpectedly large vector strange form factor ({\it e.g.,} ), it will be an indication for nonzero NSI coupling with and quarks (). We study the QE and resonance scattering cross sections of and off Argon and show that if their axial NSI is of the order of (but of course below) the present bounds, the deviation of QE cross sections from the SM prediction will be sizable and distinct from the uncertainties induced by the form factors.

    Comments:
    33 pages, 7 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2412.13349 [pdf]
    JHEP(2025)·7 citations
  2. 04

    [Submitted on 18 Dec 2024] (cross-list from hep-ph)

    Kernel methods for evolution of generalized parton distributions

    A. Freese🇺🇸 · D. Adamiak🇺🇸 · I. Cloët🇺🇸 · W. Melnitchouk🇺🇸 · J.-W. Qiu🇺🇸 · N. Sato🇺🇸 · M. Zaccheddu🇺🇸

    Generalized parton distributions (GPDs) characterize the 3-dimensional structure of hadrons, combining information about their internal quark and gluon longitudinal momentum distributions and transverse position within the hadron. The dependence of GPDs on the factorization scale allows one to connect hard exclusive processes involving GPDs at disparate energy and momentum scales, which is needed in global analyses of experimental data. In this work we explore how finite element methods can be used to construct fast and differentiable evolution codes for GPDs in momentum space, which can be used in a machine learning framework. We show numerical benchmarks of the methods' accuracy, including a comparison to an existing evolution code from PARTONS/APFEL++, and provide a repository where the code can be accessed.

    Comments:
    25 pages, 14 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:
    2412.13450 [pdf]
    Comput.Phys.Commun.(2025)·8 citations
  3. 05

    [Submitted on 18 Dec 2024] (cross-list from hep-ph)

    The Baryon-Baryon Interaction in the Large- Limit

    Thomas Vonk🇩🇪 · Ulf-G. Meißner🇩🇪

    We analyze the large- structure of the baryon-baryon potential derived in the framework of SU(3) chiral perturbation theory up to next-to-leading order including contact interactions as well as one-meson and two-meson exchange diagrams. Moreover, we assess the impact of SU(3) symmetry breaking from a large- perspective and show that the leading order results can successfully be applied to the hyperon-nucleon potential. Our results include a reduction of the number of relevant low-energy constants of the leading order contact interaction from fifteen to three, and we show that consistency is preserved if the ratio is given by and the ratio for the baryon decuplet-to-octet coupling is given by 2.

    Comments:
    18 pages, 4 figures, corresponds to the published version, more explanations, one extra appendix, typos corrected
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    2412.13677 [pdf]
    EPJA(2025)·6 citations
  4. 06

    [Submitted on 18 Dec 2024] (cross-list from nucl-ex)

    Dynamics of Hot QCD Matter 2024 -- Hard Probes

    Santosh K. Das · Prabhakar Palni · Amal Sarkar · Vineet Kumar Agotiya · Aritra Bandyopadhyay · Partha Pratim Bhaduri · Saumen Datta · Vaishnavi Desai · Debarshi Dey · Vincenzo Greco · Mohammad Yousuf Jamal · Gurleen Kaur and 15 other authors

    The hot and dense QCD matter, known as the Quark-Gluon Plasma (QGP), is explored through heavy-ion collision experiments at the LHC and RHIC. Jets and heavy flavors, produced from the initial hard scattering, are used as hard probes to study the properties of the QGP. Recent experimental observations on jet quenching and heavy-flavor suppression have strengthened our understanding, allowing for fine-tuning of theoretical models in hard probes. The second conference, HOT QCD Matter 2024, was organized to bring the community together for discussions on key topics in the field. This article comprises 15 sections, each addressing various aspects of hard probes in relativistic heavy-ion collisions, offering a snapshot of current experimental observations and theoretical advancements. The article begins with a discussion on memory effects in the quantum evolution of quarkonia in the quark-gluon plasma, followed by an experimental review, new insights on jet quenching at RHIC and LHC, and concludes with a machine learning approach to heavy flavor production at the Large Hadron Collider.

    Comments:
    Compilation of the 15 contributions in Hard Probes presented at the second 'Hot QCD Matter 2024 Conference' held from July 1-3, 2024, organized by IIT Mandi, India
    Subjects:
    Nuclear Experiment (nucl-ex); High Energy Physics — Experiment (hep-ex); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2412.14026 [pdf]
    IJMPE(2025)·8 citations
  5. 07

    [Submitted on 18 Dec 2024] (cross-list from hep-lat)

    Gluon Unpolarized, Polarized, and Transversity GPDs from Lattice QCD: Lorentz-Covariant Parametrization (Part I)

    Jakob Schoenleber🇺🇸 · Raza Sabbir Sufian🇺🇸 · Taku Izubuchi🇺🇸 · Yi-Bo Yang🇨🇳

    We identify the matrix elements necessary to determine the leading-twist gluon generalized parton distributions (GPDs) in lattice QCD calculations. We present a method to achieve a Lorentz-covariant parameterization of the matrix elements in terms of a linearly independent basis of tensor structures. This parameterization is crucial for projecting lattice QCD matrix elements onto light cone distributions. For the first time, we determine the corresponding components that project onto the linear combinations of invariant amplitudes, which reduce to the different gluon GPDs in the light cone limit and enable their separation in a lattice QCD calculation for spin- and spin- hadrons. Hence, this work lays the foundation for the numerical determination of the gluon GPDs from first-principle lattice QCD calculations, directly advancing our understanding of the mass and spin structures and mechanical properties of the nucleon, as well as the physics underlying deeply virtual Compton scattering and deeply virtual meson production in a range of experimental processes.

    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2412.14110 [pdf]
    PRD(2025)·5 citations
  6. 08

    [Submitted on 18 Dec 2024] (cross-list from hep-ph)

    Small- Asymptotics of the Leading-Twist Flavor Singlet Quark TMDs

    M. Gabriel Santiago🇺🇸 · Daniel Adamiak🇺🇸 · Yossathorn Tawabutr🇫🇮

    In this paper, we investigate the small- behavior of the flavor-singlet, leading-twist quark Transverse Momentum Dependent parton distribution functions (TMDs) using the Light-Cone Operator Treatment. This formalism allows us to express TMD operators at small in terms of polarized dipole amplitudes, enabling a systematic approach to their small- evolution. We derive the evolution equations for these TMDs and solve them within the large- approximation under the linearized, Double-Logarithmic Approximation (DLA), where represents the number of quark colors. Expanding on previous work on unpolarized and helicity TMDs, we present the small- asymptotics for a comprehensive set of TMDs, including the Sivers function, helicity worm-gear, transversity, pretzelosity, Boer-Mulders, and transversity worm-gear distributions. Our results provide a complete picture of the small- asymptotic behavior for all leading-twist flavor-singlet quark TMDs. We also discuss the implications of our findings for phenomenological applications and outline potential avenues for further research, particularly in understanding non-linear effects and extending beyond the DLA and large- approximations.

    Comments:
    29 pages, 6 figures, 2 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2412.14154 [pdf]
    PRD(2026)·4 citations
  7. 09

    [Submitted on 18 Dec 2024] (cross-list from hep-ph)

    Spectrum in Chiral Effective Field Theory

    Saad el Morabit🇳🇱 · Ryan Bouabid🇺🇸 · Vincenzo Cirigliano🇺🇸 · Jordy de Vries🇳🇱 · Lukáš Gráf🇳🇱 · Emanuele Mereghetti🇺🇸

    We investigate two-neutrino double beta decay () in chiral effective field theory. We find contributions from weak magnetism and double-weak pion-exchange at next-to-leading-order in the chiral power counting. We discuss the impact of the chiral corrections on the electron spectra and find that they should be included in analyses of decay that aim to uncover new physics signatures in the electron spectrum. We illustrate this point by revisiting the effect of sterile neutrinos and non-standard charged interactions. We also find that the pion-exchange contributions involve nuclear matrix elements that are related to those appearing in neutrinoless double beta decay (). We investigate whether the nuclear matrix elements can be obtained from detailed measurements of the energy spectrum of the outgoing electrons in transitions.

    Comments:
    25 pages, 10 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2412.14160 [pdf]
    JHEP(2025)·13 citations

Affiliations

first authorsco-authorsvia INSPIRE