• An experimental limit on the coupling of a light neutral pseudoscalar particle to hadrons

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      https://www.ias.ac.in/article/fulltext/pram/029/04/0369-0378

    • Keywords

       

      Pseudoscalar neutral particle; axion; axion-nucleon coupling costant

    • Abstract

       

      Detailed results of an experiment, looking for a short-lived neutral particle decaying by ane+e pair in the decay of the 3.68 MeV (3/2) state in13C, whose decay is predominantly M1, are presented. An upper limit of 7 × 10−5 has been placed on the branching ratio for decay through such a particle with a mass in the range 1.7 to 1.9 MeV/c2. This leads to an upper limit of 10−6 for the coupling of such a particle to nucleons. Such a limit rules out the explanation of thee+ ande peaks recently observed in heavy ion collisions, as due to the decay of a neutral particle.

    • Author Affiliations

       

      D Indumathi1 2 C V K Baba1 A Roy1 S C Vaidya1

      1. Tata Institute of Fundamental Research, Homi Bhabha Road, Bombay - 400 005, India
      2. The Institute of Mathematical Sciences, Madras - 600 113, India
    • Dates

       
  • Pramana – Journal of Physics | News

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