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Nuclear Theory·nucl-th

Friday·November 16, 2018

10 papers—5 primary·5 cross-listed

All10Primary5Cross-lists5
  1. 06

    [Submitted on 14 Nov 2018] (cross-list from hep-ph)

    On the origin of forward-backward multiplicity correlations in collisions at ultrarelativistic energies

    L.V. Bravina🇳🇴 · J. Bleibel🇩🇪 · E.E. Zabrodin🇳🇴

    We study multiplicity correlations of hadrons in forward and backward hemispheres in inelastic interactions at energies 200GeV 13TeV within the microscopic quark-gluon string model. The model correctly describes (i) the almost linear dependence of average multiplicity in one hemisphere on the particle multiplicity in other hemisphere in the center-of-mass frame; (ii) the increase of the slope parameter with rising collision energy; (iii) the quick falloff of the correlation strength with increase of the midrapidity gap; (iv) saturation of the forward-backward correlations at very high multiplicities. Investigation of the sub-processes on partonic level reveals that these features can be attributed to short-range partonic correlations within a single string and superposition of several sub-processes containing different numbers of soft and hard Pomerons with different mean multiplicities. If the number of Pomerons in the event is fixed, no forward-backward correlations are observed. Predictions are made for the top LHC energy TeV.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1811.05818 [pdf]
    PLB(2018)·12 citations
  2. 07

    [Submitted on 14 Nov 2018] (cross-list from hep-lat)

    QCD at nonzero isospin asymmetry

    Bastian B. Brandt🇩🇪 · Gergely Endrodi🇩🇪 · Sebastian Schmalzbauer🇩🇪

    We study the phase diagram and the thermodynamic properties of QCD at nonzero isospin asymmetry at physical quark masses with staggered quarks. In particular, continuum results for the phase boundary between the normal and the pion condensation phases and the chiral/deconfinement transition are presented. Our findings indicate that the pion condensation phase is restricted to ~MeV for isospin chemical potentials up to 325~MeV. We also use the data to test the range of validity of the Taylor expansion method and show first results for the equation of state.

    Comments:
    8 pages, 7 figures, poster contribution to the XIII Quark Confinement and the Hadron Spectrum (Confinement 2018) conference, 31 July - 6 August 2018, Maynooth University, Ireland
    Subjects:
    High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1811.06004 [pdf]
    PoS(2018)·21 citations
  3. 08

    [Submitted on 15 Nov 2018] (cross-list from hep-ph)

    Understanding the energy resolution of liquid argon neutrino detectors

    Alexander Friedland🇺🇸 · Shirley Weishi Li🇺🇸

    Available estimates for the energy resolution of DUNE vary by as much as a factor of four. To address this controversy, and to connect the resolution to the underlying physical processes, we build an independent simulation pipeline for neutrino events in liquid argon, combining the public tools GENIE and FLUKA. Using this pipeline, we first characterize the channels of non-hermeticity of DUNE, including subthreshold particles, charge recombination, and nuclear breakup. Particular attention is paid to the role of neutrons, which are responsible for a large fraction of missing energy in all channels. Next, we determine energy resolution, by quantifying event-to-event stochastic fluctuations in missing energy. This is done for several sets of assumptions about the reconstruction performance, including those available in the literature. The resulting migration matrices, connecting true and reconstructed neutrino energies, are presented. Finally, we quantify the impact of different improvements on the experimental performance. For example, we show that dropping particle identification information degrades the resolution by a factor of two, while omitting charge deposits from de-excitation gammas worsens it by about 25%. In the future, this framework can be used to assess the impact of cross section uncertainties on the oscillation sensitivity.

    Comments:
    22 pages, 20 figures; clarifications, references, and new figures added; results unchanged; updated to match the published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1811.06159 [pdf]
    PRD(2019)·87 citations
  4. 09

    [Submitted on 15 Nov 2018] (cross-list from hep-th)

    Derivation of spontaneously broken gauge symmetry from the consistency of effective field theory II: Scalar field self-interactions and the electromagnetic interaction

    D. Djukanovic🇩🇪 · J. Gegelia🇩🇪 · Ulf-G. Meißner🇩🇪

    We extend our study of deriving the local gauge invariance with spontaneous symmetry breaking in the context of an effective field theory by considering self-interactions of the scalar field and inclusion of the electromagnetic interaction. By analyzing renormalizability and the scale separation conditions of three-, four- and five-point vertex functions of the scalar field, we fix the two couplings of the scalar field self-interactions of the leading order Lagrangian. Next we add the electromagnetic interaction and derive conditions relating the magnetic moment of the charged vector boson to its charge and the masses of the charged and neutral massive vector bosons to each other and the two independent couplings of the theory. We obtain the bosonic part of the Lagrangian of the electroweak Standard Model as a unique solution to the conditions imposed by the self-consistency conditions of the considered effective field theory.

    Comments:
    11 pp, 3 figs
    Subjects:
    High Energy Physics — Theory (hep-th); High Energy Physics — Lattice (hep-lat); High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1811.06316 [pdf]
    PLB(2019)·1 citation
  5. 10

    [Submitted on 15 Nov 2018] (cross-list from hep-ph)

    Small- physics at the LHeC

    Heikki Mäntysaari🇫🇮

    The Large Hadron-electron Collider LHeC is a proposed upgrade of the LHC. It would add an electron beam to the LHC, and make it possible to study electron-proton and electron-nucleus collisions at very high energies. We present some of the highlights of the LHeC physics program related to the studies of partonic structure of protons and nuclei, and to the non-linear QCD phenomena visible at small .

    Comments:
    4 pages, 4 figures. Contribution to the proceedings of the 9th International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions (Hard Probes 2018)
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1811.06328 [pdf]
    PoS(2018)·1 citation

Affiliations

first authorsco-authorsvia INSPIRE