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Nuclear Theory·nucl-th

Thursday·August 3, 2023

6 papers—4 primary·2 cross-listed

All6Primary4Cross-lists2
  1. 05

    [Submitted on 1 Aug 2023] (cross-list from hep-ph)

    Energy Correlators Taking Charge

    Kyle Lee🇺🇸 · Ian Moult🇺🇸

    The confining transition from asymptotically free partons to hadrons remains one of the most mysterious aspects of Quantum Chromodynamics. With the wealth of high quality jet substructure data we can hope to gain new experimental insights into the details of its dynamics. Jet substructure has traditionally focused on correlations, , in the energy flux of hadrons. However, significantly more information about the confinement transition is encoded in how energy is correlated between hadrons with different quantum numbers, for example electric charge. In this Letter we develop the field theoretic formalism to compute general correlations, , between the energy flux carried by hadrons with quantum numbers , by introducing new universal non-perturbative functions, which we term joint track functions. Using this formalism we show that the strong interactions introduce enhanced small angle correlations between opposite-sign hadrons, relative to like-sign hadrons, identifiable as an enhanced scaling of relative to . We are also able to compute the scaling of a -odd three-point function, . Our results greatly extend the class of systematically computable jet substructure observables, pushing perturbation theory deeper into the parton to hadron transition, and providing new observables to understand the dynamics of confinement.

    Comments:
    6 pages, 5 incredible figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    2308.00746 [pdf]
    58 citations
  2. 06

    [Submitted on 1 Aug 2023] (cross-list from hep-ph)

    Theory of the (Heavy-Quark) Exotic Hadrons: A Primer for the Flavor Community

    Richard F. Lebed🇺🇸

    Scores of exotic hadrons, particularly tetraquarks and pentaquarks in the heavy-quark sector, have been observed in the past 20 years, and more continue to be discovered to this day. Unlike mesons and baryons, such exotics are not mandated to exist under our current understanding of QCD, meaning that each new discovery presents fresh insights into the expansive possibilities of strong-interaction physics. Even the basic architecture of these multiquark states remains an open question. Here we discuss the merits and deficiencies of their best-known dynamical descriptions, recognizing that the eventual universal model for exotics will almost certainly require the synthesis of more than one fundamental paradigm.

    Comments:
    13 pages, 1 figure. Accepted to appear in Proceedings of Science. Based on invited talk at the 21st Conference on Flavor Physics and CP Violation (FPCP 2023), Lyon, France (29 May-2 June 2023)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    2308.00781 [pdf]
    PoS(2023)·17 citations

Affiliations

first authorsco-authorsvia INSPIRE