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Nuclear Theory·nucl-th

Thursday·October 8, 2020

4 papers—2 primary·2 cross-listed

All4Primary2Cross-lists2
  1. 03

    [Submitted on 6 Oct 2020] (cross-list from hep-ph)

    The Fragmentation Spectrum from Space-Time Reciprocity

    Duff Neill🇺🇸

    Analyzing the single inclusive annihilation spectrum of charged hadrons in collisions, I confront the hadronization hypothesis of local parton-hadron duality with a systematic resummation of the dependence on the small energy fraction. This resummation is based on the reciprocity between time-like and space-like splitting processes in -dimensions, which I extend to resum all the soft terms of the cross-section for inclusive jet production. Under the local-parton-hadron duality hypothesis, the resulting distribution of jets essentially determines the spectrum of hadrons as the jet radius goes to zero. Thus I take the resummed perturbative jet function as the non-perturbative fragmentation function with an effective infra-red coupling. I find excellent agreement with data, and comment on the mixed leading log approximation previously used to justify local parton-hadron duality.

    Comments:
    24 pgs. 15 figs, v3 corrected more typos, improved notation. Added more plots for large momentum region
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2010.02934 [pdf]
    JHEP(2021)·9 citations
  2. 04

    [Submitted on 6 Oct 2020] (cross-list from hep-lat)

    The Positive-Parity Baryon Spectrum and the Role of Hybrid Baryons

    Tanjib Khan🇺🇸 · David Richards🇺🇸 · Frank Winter🇺🇸

    We calculate the low-lying spectra for the positive-parity and at two pion masses of 358 and 278 MeV using an isotropic clover action with two degenerate light-quaark and one strange-quark flavors through the application of the generalized variational method within the distillation framework. The spectrum exhibits the general features observed in previous calculations using an anisotropic clover lattice, with a counting of states at least as rich as the quark model. Furthermore, we identify states that are hybrid in nature, where gluonic degrees of freedom play a structural role, indicatinng that such states appear a feature of the excited baryon spectrum, irrespective of the lattice action, or the precise details of the smearing of the lattice interpolating operators used to identify such states.

    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    2010.03052 [pdf]
    PRD(2021)·26 citations

Affiliations

first authorsco-authorsvia INSPIRE