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Nuclear Theory·nucl-th

Monday·January 9, 2017

5 papers—2 primary·3 cross-listed

All5Primary2Cross-lists3
  1. 01

    [Submitted on 5 Jan 2017]

    Up- and down-quark contributions to the nucleon electromagnetic form factors at low

    I. A. Qattan🇦🇪 · J. Arrington🇺🇸

    The spatial distribution of charge and magnetization within the nucleon (proton and neutron) is encoded in the elastic electromagnetic form factors and . These form factors have been precisely measured utilizing elastic electron scattering, and the combination of proton and neutron form factors allows for the separation of the up- and down-quark contributions to the nucleon form factors. We expand on our original analyses and extract the up- and down-quark contributions to the nucleon electromagnetic form factors from worldwide data with an emphasis on precise new data covering the low-momentum region, which is sensitive to the large-scale structure of the nucleon. From these, we construct the flavor-separated Dirac and Pauli form factors and their ratios, and compare the results to recent extractions and theoretical calculations and models.

    Comments:
    4 pages, 2 figures, Conference Proceedings, Frontiers in Theoretical and Applied Physics FTAPS2017
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1701.01662 [pdf]
    J.Phys.Conf.Ser.(2017)·16 citations
  2. 02

    [Submitted on 6 Jan 2017]

    Inelastic Neutrino-Nucleus Interactions within the Spectral Function Formalism

    Erica Vagnoni🇮🇹 · Omar Benhar🇮🇹 · Davide Meloni🇮🇹

    We report the results of a study of neutrino-carbon interactions at beam energies ranging between few hundreds MeV and few tens of GeV, carried out within the framework of the impulse approximation using a realistic spectral function. The contributions of quasi elastic scattering, resonance production and deep inelastic scattering---consistently obtained, for first time, from a model based on a realistic description of the nuclear ground state---are compared and analyzed.

    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1701.01718 [pdf]
    PRL(2017)·36 citations
  3. 03

    [Submitted on 2 Jan 2017] (cross-list from hep-ph)

    Identifying the QCD Phase Transitions via the Gravitational Wave Frequency

    Wei-jie Fu🇨🇳 · Zhan Bai🇨🇳 · Yu-xin Liu🇨🇳

    We investigate the nonradial oscillations of newly born neutron stars (NSs) and strange quark stars (SQSs). This is done with the relativistic nuclear field theory with hyperon degrees of freedom employed to describe the equation of state for the stellar matter in NSs, and with both the MIT bag model and the Nambu--Jona-Lasinio model adopted to construct the configurations of the SQSs. We find that the gravitational-mode (-mode) eigenfrequencies of newly born SQSs are about one order of magnitude lower than those of NSs, which is independent of models implemented to describe the equation of state for the strange quark matter. Meanwhile the eigenfrequencies of the other modes of nonradial oscillations, e.g., fundamental ()- and pressure ()-modes, are much larger than those of the -mode. In the light of the first direct observation of gravitational waves, it is promising to employ the gravitational waves to identify the QCD phase transition in high density strong interaction matter.

    Comments:
    14 pages, 7 figures and 3 tables
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Astrophysical Phenomena (astro-ph.HE); Nuclear Theory (nucl-th)
    arXiv:
    1701.00418 [pdf]
    5 citations
  4. 04

    [Submitted on 5 Jan 2017] (cross-list from hep-ph)

    Neutrinoless double beta decay and chiral

    V. Cirigliano🇺🇸 · W. Dekens🇺🇸 · M. Graesser🇺🇸 · E. Mereghetti🇺🇸

    TeV-scale lepton number violation can affect neutrinoless double beta decay through dimension-9 operators involving two electrons and four quarks. Since the dominant effects within a nucleus are expected to arise from pion exchange, the matrix elements of the dimension-9 operators are a key hadronic input. In this letter we provide estimates for the matrix elements of all Lorentz scalar four-quark operators relevant to the study of TeV-scale lepton number violation. The analysis is based on chiral symmetry, which relates the matrix elements of the operators to the and matrix elements of their and chiral partners, for which lattice QCD input is available. The inclusion of next-to-leading order chiral loop corrections to all symmetry relations used in the analysis makes our results robust at the level or better, depending on the operator.

    Comments:
    9 pages
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Theory (nucl-th)
    arXiv:
    1701.01443 [pdf]
    PLB(2017)·54 citations
  5. 05

    [Submitted on 6 Jan 2017] (cross-list from cond-mat.stat-mech)

    Perturbative Expansion of Irreversible Work in Fokker-Planck Equation a la Quantum Mechanics

    T. Koide

    We discuss the systematic expansion of the solution of the Fokker-Planck equation with the help of the eigenfunctions of the time-dependent Fokker-Planck operator. The expansion parameter is the time derivative of the external parameter which controls the form of an external potential. Our expansion corresponds to the perturbative calculation of the adiabatic motion in quantum mechanics. With this method, we derive a new formula to calculate the irreversible work order by order, which is expressed as the expectation value with a pseudo density matrix. Applying this method to the case of the harmonic potential, we show that the first order term of the expansion gives the exact result. Because we do not need to solve the coupled differential equations of moments, our method simplifies the calculations of various functions such as the fluctuation of the irreversible work per unit time. We further investigate the exact optimized protocol to minimize the irreversible work by calculating its variation with respect to the control parameter itself.

    Comments:
    28 pages, 4 figures, published version in J. Phys. A
    Subjects:
    Statistical Mechanics (cond-mat.stat-mech); Mathematical Physics (math-ph); math.MP (math.MP); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    1701.01716 [pdf]
    J.Phys.A(2017)·3 citations

Affiliations

first authorsco-authorsvia INSPIRE