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Nuclear Theory·nucl-th

Monday·January 30, 2017

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 07

    Collinear parton distributions and the structure of the nucleon sea in a light-front meson-cloud model

    S. Kofler (Graz U.)🇦🇹 · B. Pasquini (Pavia U. & INFN, Pavia)🇮🇹

    The unpolarized, helicity and transversity parton distribution functions of the nucleon are studied within a convolution model where the bare nucleon is dressed by its virtual meson cloud. Using light-front time-ordered perturbation theory, the Fock states of the physical nucleon are expanded in a series involving a bare nucleon and two-particle, meson-baryon, states. The bare baryons and mesons are described with light-front wave functions (LFWFs) for the corresponding valence-parton components. Using a representation in terms of overlap of LFWFs, the role of the non-perturbative antiquark degrees of freedom and the valence quark contribution at the input scale of the model is discussed for the leading-twist collinear parton distributions. After introducing perturbative QCD effects through evolution to experimental scales, the results are compared with available data and phenomenological extractions. Predictions for the nucleon tensor charge are also presented, finding a very good agreement with recent phenomenological extractions.

    ↳ hep-phnucl-thPRD(2017)·15 citations
  2. 08

    Heavy neutrino potential for neutrinoless double beta decay

    Yoritaka Iwata🇯🇵

    Heavy neutrino potential for neutrinoless double beta decay is studied with focusing on its statistical property. The existence condition for heavy neutrinos is also presented. In particular sterile neutrinos are possible candidate for heavy nuetrinos. The statistics provide a gross view of understanding amplitude of constitutional components of the nuclear matrix element.

    ↳ hep-phnucl-thPoS(2017)·1 citation
  3. 09

    Top-quark and Higgs boson perspectives at heavy-ion colliders

    David d'Enterria🇨🇭

    The perspectives for measuring the top quark and the Higgs boson in nuclear collisions at the LHC and Future Circular Collider (FCC) are summarized. Perturbative QCD calculations at (N)NLO accuracy, including nuclear parton distribution functions, are used to determine their cross sections and visible yields after standard analysis cuts in PbPb and pPb collisions at the LHC ( = 5.5, 8.8 TeV) and FCC ( = 39, 63 TeV). In their "cleanest" decay channels, and , about 10 () top-quark and 10 (10) Higgs-boson events are expected at the LHC (FCC) for their total nominal integrated luminosities. Whereas the observation is clearcut at both colliders, evidence for Higgs production, perfectly possible at the FCC, requires integrating 30 more luminosities at the LHC.

    ↳ hep-exhep-phnucl-exnucl-thNucl.Part.Phys.Proc.(2017)·18 citations

Affiliations

first authorsco-authorsvia INSPIRE