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Nuclear Theory·nucl-th

Thursday·February 5, 2015

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 06

    [Submitted on 30 Jan 2015] (cross-list from hep-ph)

    Neutrino induced decoherence and variation in nuclear decay rates

    Douglas Singleton🇺🇸 · Nader Inan🇺🇸 · Raymond Y. Chiao🇺🇸

    Recent work has proposed that the interaction between ordinary matter and a stochastic gravitational background can lead to the decoherence of large aggregates of ordinary matter. In this work we point out that these arguments can be carried over to a stochastic neutrino background but with the Planck scale of the gravitational decoherence replaced by the weak scale. This implies that it might be possible to observe such neutrino induced decoherence on a small, microscopic system rather than a macroscopic system as is the case for gravitationally induced decoherence. In particular we suggest that neutrino decoherence could be linked with observed variations in the decay rates of certain nuclei. Finally we point out that this proposed neutrino induced decoherence can be considered the complement of the Mikheev-Smirnov-Wolfenstein (MSW) effect.

    Comments:
    15 pages revtex, 0 figures, to be published Phys. Lett. A
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th); Quantum Physics (quant-ph)
    arXiv:
    1501.07665 [pdf]
    PLA(2015)·4 citations
  2. 07

    [Submitted on 3 Feb 2015] (cross-list from hep-ph)

    Analysis of pPb collisions at LHC energies in the relativistic diffusion model

    P. Schulz🇩🇪 · G. Wolschin🇩🇪

    Particle production sources in pPb collisions at LHC energies are investigated in pseudorapidity space as functions of centrality. The nonequilibrium-statistical relativistic diffusion model (RDM) with three sources is applied to the analysis of preliminary charged-hadron distributions measured by the ATLAS and ALICE collaborations in pPb collisions at 5.02 TeV. The size of the midrapidity source relative to the fragmentation sources in pPb collisions is considered as function of centrality, and incident energy. At LHC energies particle production from the mid-rapidity gluon-gluon source is larger than that from the fragmentation sources at all centralities. Conclusions regarding the statistical equilibration process are drawn.

    Comments:
    6 pages, 4 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1502.01056 [pdf]
    EPJA(2015)·6 citations
  3. 08

    [Submitted on 4 Feb 2015] (cross-list from hep-th)

    The Light-Front Vacuum

    Marc Herrmann🇺🇸 · Wayne Polyzou🇺🇸

    Background: The vacuum in the light-front representation of quantum field theory is trivial while vacuum in the equivalent canonical representation of the same theory is non-trivial. Purpose: Understand the relation between the vacuum in light-front and canonical representations of quantum field theory and the role of zero-modes in this relation. Method: Vacuua are defined as linear functionals on an algebra of field operators. The role of the algebra in the definition of the vacuum is exploited to understand this relation. Results: The vacuum functional can be extended from the light-front Fock algebra to an algebra of local observables. The extension to the algebra of local observables is responsible for the inequivalence. The extension defines a unitary mapping between the physical representation of the local algebra and a sub-algebra of the light-front Fock algebra. Conclusion: There is a unitary mapping from the physical representation of the algebra of local observables to a sub-algebra of the light-front Fock algebra with the free light-front Fock vacuum. The dynamics appears in the mapping and the structure of the sub-algebra. This correspondence provides a formulation of locality and Poincaré invariance on the light-front Fock space.

    Comments:
    17 Pages
    Subjects:
    High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1502.01230 [pdf]
    PRD(2015)·12 citations
  4. 09

    [Submitted on 4 Feb 2015] (cross-list from hep-ph)

    Unexpected Mesons X, Y, Z, ... (tetraquarks? hadron molecules? ...)

    Ya.I. Azimov🇷🇺

    This talk briefly discusses the set of meson resonances discovered in the latest decade. They are frequently treated in the literature as tetraquarks or hadron molecules. Our consideration (using the energy-time uncertainty relation) suggests, however, that the most reasonable description for each of them may be a two- (or more-) component Fock column, with one line being a conventional quark-antiquark pair, and the other line(s) corresponding to a charmed (or beauty) meson-antimeson pair near its threshold. Detailed investigation of decay properties might allow to reveal presence of several Fock components and separate their contributions.

    Comments:
    5 pages, based on the invited talk at HSQCD-2014; to appear in Nucl. Phys. B Proceedings Suppl.; v2: more accurate formulation in Conclusions; v3: corrected style files
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1502.01279 [pdf]
    2 citations
  5. 10

    [Submitted on 4 Feb 2015] (cross-list from hep-ph)

    Azimuthal anisotropies in p+Pb collisions from classical Yang-Mills dynamics

    Björn Schenke🇺🇸 · Sören Schlichting🇺🇸 · Raju Venugopalan🇺🇸

    We compute single and double inclusive gluon distributions in classical Yang-Mills simulations of proton-lead collisions and extract the associated transverse momentum dependent Fourier harmonics and . Gluons have a large in the initial state, while odd harmonics such as vanish identically at the initial time . By the time final state effects in the classical Yang-Mills evolution generate a non-zero and only mildly modify the gluon . Unlike hydrodynamic flow, these momentum space anisotropies are uncorrelated with the global spatial anisotropy of the collision. A principal ingredient for the generation of and in this framework is the event-by-event breaking of rotational invariance in domains the size of the inverse of the saturation scale . In contrast to our findings in p+Pb collisions Yang-Mills simulations of lead-lead collisions generate much smaller values of and additional collective flow effects are needed to explain experimental data. This is because the locally generated anisotropy due to the breaking of rotational invariance is depleted with the increase in the number of uncorrelated domains.

    Comments:
    Minor modifications; Version to appear in Phys. Lett. B
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1502.01331 [pdf]
    PLB(2015)·145 citations

Affiliations

first authorsco-authorsvia INSPIRE