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    Please use this identifier to cite or link to this item: http://ir.lib.ncu.edu.tw/handle/987654321/52952


    Title: Proton Size Anomaly
    Authors: Barger,V;Chiang,CW;Keung,WY;Marfatia,D
    Contributors: 物理學系
    Keywords: HADRON DECAY PROCESSES;ELECTRIC POLARIZABILITY;MUONIC HYDROGEN;GAUGE BOSON;QUARK-MODEL;NEUTRON;SEARCH;SCATTERING;CONSTANTS;ATOMS
    Date: 2011
    Issue Date: 2012-06-11 10:51:23 (UTC+8)
    Publisher: 國立中央大學
    Abstract: A measurement of the Lamb shift in muonic hydrogen yields a charge radius of the proton that is smaller than the CODATA value by about 5 standard deviations. We explore the possibility that new scalar, pseudoscalar, vector, and tensor flavor-conserving nonuniversal interactions may be responsible for the discrepancy. We consider exotic particles that, among leptons, couple preferentially to muons and mediate an attractive nucleon-muon interaction. We find that the many constraints from low energy data disfavor new spin-0, spin-1, and spin-2 particles as an explanation.
    Relation: PHYSICAL REVIEW LETTERS
    Appears in Collections:[物理學系] 期刊論文

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