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Nuclear Theory·nucl-th

Friday·June 24, 2016

8 papers—5 primary·3 cross-listed

All8Primary5Cross-lists3
  1. 06

    [Submitted on 22 Jun 2016] (cross-list from hep-ph)

    Jet substructure using semi-inclusive jet functions within SCET

    Zhong-Bo Kang🇺🇸 · Felix Ringer🇺🇸 · Ivan Vitev🇺🇸

    We propose a new method to evaluate jet substructure observables in inclusive jet measurements, based upon semi-inclusive jet functions in the framework of Soft Collinear Effective Theory (SCET). As a first example, we consider the jet fragmentation function, where a hadron is identified inside a fully reconstructed jet. We introduce a new semi-inclusive fragmenting jet function , which depends on the jet radius and the large light-cone momenta of the parton `' initiating the jet (), the jet (), and the hadron (). The jet fragmentation function can then be expressed as a semi-inclusive observable, in the spirit of actual experimental measurements, rather than as an exclusive one. We demonstrate the consistency of the effective field theory treatment and standard perturbative QCD calculations of this observable at next-to-leading order (NLO). The renormalization group (RG) equation for the semi-inclusive fragmenting jet function are also derived and shown to follow exactly the usual timelike DGLAP evolution equations for fragmentation functions. The newly obtained RG equations can be used to perform the resummation of single logarithms of the jet radius parameter up to next-to-leading logarithmic (NLL) accuracy. In combination with the fixed NLO calculation, we obtain NLO+NLL results for the hadron distribution inside the jet. We present numerical results for in the new framework, and find excellent agreement with existing LHC experimental data.

    Comments:
    28 pages, 6 figures, published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1606.07063 [pdf]
    JHEP(2016)·113 citations
  2. 07

    [Submitted on 22 Jun 2016] (cross-list from hep-ph)

    Strange Quark Magnetic Moment of the Nucleon at Physical Point

    Raza Sabbir Sufian🇺🇸 · Yi-Bo Yang🇺🇸 · Andrei Alexandru🇺🇸 · Terrence Draper🇺🇸 · Keh-Fei Liu🇺🇸 · Jian Liang🇺🇸

    We report a lattice QCD calculation of the strange quark contribution to the nucleon's magnetic moment and charge radius. This analysis presents the first direct determination of strange electromagnetic form factors including at the physical pion mass. We perform a model-independent extraction of the strange magnetic moment and the strange charge radius from the electromagnetic form factors in the momentum transfer range of . The finite lattice spacing and finite volume corrections are included in a global fit with valence quark masses on four lattices with different lattice spacings, different volumes, and four sea quark masses including one at the physical pion mass. We obtain the strange magnetic moment . The four-sigma precision in statistics is achieved partly due to low-mode averaging of the quark loop and low-mode substitution to improve the statistics of the nucleon propagator. We also obtain the strange charge radius .

    Comments:
    Published version in Physical Review Letters
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1606.07075 [pdf]
    PRL(2017)·57 citations
  3. 08

    [Submitted on 23 Jun 2016] (cross-list from quant-ph)

    Decoherence and the Branching of Chaos-less Classical Trajectory

    Takuji Ishikawa

    This study was started to know mysterious classicality of nuclei. This time, I found a new rule for decoherence. I used a model without chaos. As a result, it was shown that not only the intersection of classical trajectories but also branching of classical trajectories are needed for decoherence. In other words, it was shown that interactions between a main system and environments have to make enough branchings of classical trajectories of the main system for decoherence.

    Comments:
    arXiv admin note: substantial text overlap with arXiv:1606.06282
    Subjects:
    Quantum Physics (quant-ph); Nuclear Theory (nucl-th)
    arXiv:
    1606.07098 [pdf]
    0 citations

Affiliations

first authorsco-authorsvia INSPIRE