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Nuclear Theory·nucl-th

Tuesday·March 7, 2017

9 papers—6 primary·3 cross-listed

All9Primary6Cross-lists3
  1. 07

    [Submitted on 3 Mar 2017] (cross-list from cond-mat.quant-gas)

    Tetramer Bound States in Heteronuclear Systems

    C. H. Schmickler · H.-W. Hammer · E. Hiyama

    We calculate the universal spectrum of trimer and tetramer states in heteronuclear mixtures of ultracold atoms with different masses in the vicinity of the heavy-light dimer threshold. To extract the energies, we solve the three- and four-body problem for simple two- and three-body potentials tuned to the universal region using the Gaussian expansion method. We focus on the case of one light particle of mass and two or three heavy bosons of mass with resonant heavy-light interactions. We find that trimer and tetramer cross into the heavy-light dimer threshold at almost the same point and that as the mass ratio decreases, the distance between the thresholds for trimer and tetramer states becomes smaller. We also comment on the possibility of observing exotic three-body states consisting of a dimer and two atoms in this region and compare with previous work.

    Comments:
    19 pages, 6 figures, final version, added some remarks and one reference and fixed notation
    Subjects:
    Quantum Gases (cond-mat.quant-gas); Nuclear Theory (nucl-th)
    arXiv:
    1703.01147 [pdf]
    PRA(2017)·6 citations
  2. 08

    [Submitted on 4 Mar 2017] (cross-list from hep-ph)

    Charmonium ground and excited states at finite temperature from complex Borel sum rules

    Ken-Ji Araki🇯🇵 · Kei Suzuki🇯🇵 · Philipp Gubler🇰🇷 · Makoto Oka🇯🇵

    Charmonium spectral functions in vector and pseudoscalar channels at finite temperature are investigated through the complex Borel sum rules and the maximum entropy method. Our approach enables us to extract the peaks corresponding to the excited charmonia, and , as well as those of the ground states, and , which has never been achieved in usual QCD sum rule analyses. We show the spectral functions in vacuum and their thermal modification around the critical temperature, which leads to the almost simultaneous melting (or peak disappearance) of the ground and excited states.

    Comments:
    6 pages, 4 figures; published version
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); High Energy Physics — Lattice (hep-lat); Nuclear Experiment (nucl-ex); Nuclear Theory (nucl-th)
    arXiv:
    1703.01438 [pdf]
    PLB(2018)·6 citations
  3. 09

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

    Probing exotic phenomena at the interface of nuclear and particle physics with the electric dipole moments of diamagnetic atoms: A unique window to hadronic and semi-leptonic CP violation

    N. Yamanaka🇷🇺 · B. K. Sahoo🇮🇳 · N. Yoshinaga🇯🇵 · T. Sato🇯🇵 · K. Asahi🇯🇵 · B. P. Das🇯🇵

    The current status of electric dipole moments of diamagnetic atoms which involves the synergy between atomic experiments and three different theoretical areas -- particle, nuclear and atomic is reviewed. Various models of particle physics that predict CP violation, which is necessary for the existence of such electric dipole moments, are presented. These include the standard model of particle physics and various extensions of it. Effective hadron level combined charge conjugation (C) and parity (P) symmetry violating interactions are derived taking into consideration different ways in which a nucleon interacts with other nucleons as well as with electrons. Nuclear structure calculations of the CP-odd nuclear Schiff moment are discussed using the shell model and other theoretical approaches. Results of the calculations of atomic electric dipole moments due to the interaction of the nuclear Schiff moment with the electrons and the P and time-reversal (T) symmetry violating tensor-pseudotensor electron-nucleus are elucidated using different relativistic many-body theories. The principles of the measurement of the electric dipole moments of diamagnetic atoms are outlined. Upper limits for the nuclear Schiff moment and tensor-pseudotensor coupling constant are obtained combining the results of atomic experiments and relativistic many-body theories. The coefficients for the different sources of CP violation have been estimated at the elementary particle level for all the diamagnetic atoms of current experimental interest and their implications for physics beyond the standard model is discussed. Possible improvements of the current results of the measurements as well as quantum chromodynamics, nuclear and atomic calculations are suggested.

    Comments:
    46 pages, 19 tables and 16 figures. A review article accepted for EPJA
    Subjects:
    High Energy Physics — Phenomenology (hep-ph); Nuclear Theory (nucl-th); Atomic Physics (physics.atom-ph)
    arXiv:
    1703.01570 [pdf]
    EPJA(2017)·201 citations

Affiliations

first authorsco-authorsvia INSPIRE