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Nuclear Theory·nucl-th

Wednesday·August 24, 2016

8 papers—2 primary·6 cross-listed

All8Primary2Cross-lists6
  1. 01

    [Submitted on 23 Aug 2016]

    The exchange effect in the Lamb shift of muonic hydrogen by two photons and two pions exchange

    Hai-Qing Zhou🇨🇳

    Based on the simple phenomenological , and interactions, we estimate the exchange effect in the Lamb shift of muonic hydrogen. We at first calculate the effective couplings of by two photons and two pions exchange, then calculate the corresponding corrections to the energy shift of the 2S/2P states of muonic hydrogen. We find the correction to the energy shift of 2S state is about -14eV by the current used parameters, which is about of the usual two photons exchange contribution, and is larger than the current experimental precision, and should be considered in the experimental analysis.

    Comments:
    2 figures
    Subjects:
    Nuclear Theory (nucl-th); High Energy Physics — Phenomenology (hep-ph); Nuclear Experiment (nucl-ex)
    arXiv:
    1608.06460 [pdf]
    0 citations
  2. 02

    [Submitted on 23 Aug 2016]

    Challenges in flow background removal in search for the chiral magnetic effect

    Fuqiang Wang🇨🇳 · Jie Zhao🇺🇸

    We investigate the effect of resonance decays on the three-particle correlator charge separation observable in search for the chiral magnetic effect, using a simple simulation with realistic inputs. We find that resonance decays can largely account for the measured signal. We suppress the elliptic flow () background by using zero event-by-event (or via the mixed-event technique). We find that the background is suppressed, but not eliminated as naively anticipated. We identify the reason to be the non-identicalness of the resonance and final-state particle's and the induced correlation between the transverse momentum dependent resonance and decay angle. We make predictions for the charge separation signal due to resonance decays in 200~GeV Au+Au collisions.

    Subjects:
    Nuclear Theory (nucl-th); Nuclear Experiment (nucl-ex)
    arXiv:
    1608.06610 [pdf]
    PRC(2017)·63 citations

Affiliations

first authorsco-authorsvia INSPIRE