Search for heavy Majorana neutrino in lepton number violating decays of D→Kπe+e+

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Abstract

Using a data sample with an integrated luminosity of 2.93  fb−1 taken at the center-of-mass energy of 3.773 GeV, we search for the Majorana neutrino (νm) in the lepton number violating decays D→Kπe+e+. No significant signal is observed, and the upper limits on the branching fraction at the 90% confidence level are set to be B(D0→K−π−e+e+)<2.8×10−6, B(D+→K0Sπ−e+e+)<3.3×10−6 and B(D+→K−π0e+e+)<8.5×10−6. The Majorana neutrino is searched for with different mass assumptions ranging from 0.25 to 1.0  GeV/c2 in the decays D0→K−e+νm,νm→π−e+ and D+→K0Se+νm,νm→π−e+, and the upper limits on the branching fraction at the 90% confidence level are at the level of 10−7∼10−6, depending on the mass of the Majorana neutrino. The constraints on the mixing matrix element |Veνm|2 are also evaluated

Original languageEnglish
Article number112002
Number of pages9
JournalPhysical Review D
Volume99
Issue number11
DOIs
Publication statusPublished - 6 Jun 2019

Keywords

  • MIXINGS
  • MODELS
  • MASSES

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