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Nuclear Theory·nucl-th

Wednesday·June 20, 2018

7 papers—2 primary·5 cross-listed

All7Primary2Cross-lists5
  1. 01

    [Submitted on 19 Jun 2018]

    Analysing supersymmetric transformed -nucleus potentials with electric-multipole transitions

    T. Arai · W. Horiuchi · D. Baye

    Alpha(He)-cluster models have often been used to describe light nuclei. Towards the application to multi-cluster systems involving heavy clusters, we study the relative wave functions of the O and Ca systems generated from phase-shift-equivalent potentials. In general, a potential between clusters is deep accommodating several redundant bound states which should be removed in an appropriate way. To avoid such a complicated computation, we generate a shallow-singular potential by using supersymmetric transformations from the original deep potential. Changes in the relative wave functions by the transformations are quantified with electric-multipole transitions which give a different radial sensitivity to the wave function depending on their multipolarity. Despite the fact that the original and transformed potentials give exactly the same phase shift, some observables are unfavorably modified. A possible way to obtain a desired supersymmetric potential is proposed.

    Comments:
    30 pages, 9 figures, to appear in Nucl. Phys. A
    Subjects:
    Nuclear Theory (nucl-th)
    arXiv:
    1806.07029 [pdf]
    NPA(2018)·7 citations
  2. 02

    [Submitted on 18 Jun 2018]

    Collapse to the Center and Ambiguity in the Asymptotic Behavior of the Off-Shell Scattering Amplitude in Singular Three-Body Problems

    Alexander E. Kudryavtsev🇷🇺 · Alexander I. Romanov🇷🇺

    We discuss some examples of equations of the three-body problem with the oscillating asymptotics at large momentum: (i) the fixed-center approximation, (ii) the unitarized equation in the fixed-center approximation, (iii) Skornyakov--Ter-Martirosyan equation, and (iv) equations with operators used in the effective field theory, i.e., which can be expanded in power-series with positive powers of momentum. We show that in the aforementioned three-body problems the situation analogous to the falling down to the center in the two-body problem takes place -- there appears an infinite number of bound states. The energy of these states is not bounded from below. In that sense the situation is close to the falling down to the center in the two-body problem.

    Comments:
    12 pages, 1 figure
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph)
    arXiv:
    1806.07269 [pdf]
    Phys.Atom.Nucl.(2018)·0 citations
  3. 03

    [Submitted on 16 Jun 2018] (cross-list from hep-ph)

    Dipole Polarizabilities of -Mesons

    L.V. Fil'kov🇷🇺 · V.L. Kashevarov🇷🇺

    The main experimental works, where dipole polarizabilities of charged pions have been determined, are considered. Possible reasons for the differences between the experimental data are discussed. In particular, it is shown that the account of the -meson gives a significant correction to the value of the polarizability obtained in the latest experiment of the COMPASS collaboration. We present also new fit results for the reaction.

    Comments:
    6 pages, 2 figures. XXXI International Workshop on High Energy Physics: Critical Points in the Modern Particle Physics. arXiv admin note: substantial text overlap with arXiv:1703.01233
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Theory (nucl-th)
    arXiv:
    1806.06852 [pdf]
    Int.J.Mod.Phys.Conf.Ser.(2018)·4 citations
  4. 04

    [Submitted on 19 Jun 2018] (cross-list from hep-ph)

    Jet quenching parameter in an expanding QCD plasma

    Edmond Iancu🇫🇷 · Pieter Taels🇫🇷 · Bin Wu🇨🇭

    We study the phenomenon of transverse momentum broadening for a high- parton propagating through a weakly-coupled quark-gluon plasma undergoing boost-invariant longitudinal expansion. We propose a boost-invariant description for this phenomenon, in which the broadening refers to the angular variables (the pseudo-rapidity) and (the azimuthal angle). The jet quenching parameter which enters this description depends upon the proper time alone. We furthermore consider radiative corrections to . As in the case of a static medium, we find potentially large corrections enhanced by a double logarithm. But unlike for the static medium, these corrections are now local in time: they depend upon the local (proper) time characterizing the expansion, and not upon the overall path length. We resum such corrections to all orders into a renormalized jet quenching parameter. The main effect of this resummation is to slow down the decrease of with increasing proper time.

    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Experiment (hep-ex); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1806.07177 [pdf]
    PLB(2018)·25 citations
  5. 05

    [Submitted on 19 Jun 2018] (cross-list from hep-ph)

    Inclusive jet production as a probe of polarized PDFs at a future EIC

    Radja Boughezal🇺🇸 · Frank Petriello🇺🇸 · Hongxi Xing🇺🇸

    We present a detailed phenomenological study of polarized inclusive jet production in electron-proton collisions at a future Electron-Ion Collider (EIC). Our analysis is performed at next-to-leading order in perturbative QCD using the numerical code DISTRESS and includes all relevant partonic channels and resolved photon contributions. We elucidate the role of different kinematic regions in probing different aspects of proton and photon structure and study the impact of the EIC collision energy on the measurement of polarized parton distribution functions.

    Comments:
    18 pages, 23 figures
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1806.07311 [pdf]
    PRD(2018)·31 citations
  6. 06

    [Submitted on 19 Jun 2018] (cross-list from hep-th)

    Rolling Skyrmions and the Nuclear Spin-Orbit Force

    Derek Harland🇬🇧 · Nicholas S. Manton🇬🇧

    We compute the nuclear spin-orbit coupling from the Skyrme model. Previous attempts to do this were based on the product ansatz, and as such were limited to a system of two well-separated nuclei. Our calculation utilises a new method, and is applicable to the phenomenologically important situation of a single nucleon orbiting a large nucleus. We find that, to second order in perturbation theory, the coefficient of the spin-orbit coupling induced by pion field interactions has the wrong sign, but as the strength of the pion-nucleon interactions increases the correct sign is recovered non-perturbatively.

    Comments:
    37 pages, 5 figures. v2: discussion of the literature improved, and other minor changes
    Subjects:
    High Energy Physics — Theory (hep-th); Nuclear Theory (nucl-th)
    arXiv:
    1806.07330 [pdf]
    NPB(2018)·9 citations
  7. 07

    [Submitted on 19 Jun 2018] (cross-list from hep-ph)

    Radiative instability of quantum electrodynamics in chiral matter

    Kirill Tuchin🇺🇸

    Modification of the photon dispersion relation in chiral matter enables scattering. As a result, the single fermion and photon states are unstable to photon radiation and pair production respectively. In particular, a fast fermion moving through chiral matter can spontaneously radiate a photon, while a photon can spontaneously radiate a fast fermion and anti-fermion pair. The corresponding spectra are derived in the ultra-relativistic approximation. It is shown that the polarization of the produced and decayed photons is determined by the sign of the chiral conductivity. Impact of a flat thin domain wall on the spectra is computed.

    Comments:
    13 pages. v2: error in IVA corrected, explanations and references added, typos fixed
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th)
    arXiv:
    1806.07340 [pdf]
    PLB(2018)·25 citations

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first authorsco-authorsvia INSPIRE