Abstract

Using $1.31\times10^9$ $J/\psi$ events collected by the BESIII detector at the Beijing Electron Positron Collider, we search for the process $J/\psi\to\Lambda_c^+e^-+c.c.$ for the first time. In this process, both baryon and lepton number conservation is violated. No signal is found and the upper limit on the branching fraction $\mathcal{B}(J/\psi\to\Lambda_c^+e^-+c.c.)$ is set to be $6.9\times10^{-8}$ at the 90\% Confidence Level.

Highlights

  • The observed matter–antimatter asymmetry in the universe composes a serious challenge to our understanding of nature

  • We analyze the J=ψ data sample collected with the BESIII [15] detector operating at the BEPCII storage ring [16] to search for the Standard Model (SM) forbidden baryonlepton number violating decay J=ψ → Λþc e−

  • Inclusive Monte Carlo (MC) events of J=ψ dpefficffiays are generated by the KKMC [20] generator around s 1⁄4 3.097 GeV, in which the beam energy and spread are set to the values measured at BEPCII, and initial state radiation (ISR) is considered

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Summary

INTRODUCTION

The observed matter–antimatter asymmetry in the universe composes a serious challenge to our understanding of nature. Proposals that evoke the spontaneous breaking of a large gauge group are especially appealing In these models, several heavy gauge bosons emerge whose couplings to matter explicitly violate both baryon and lepton number conservation simultaneously. We analyze the J=ψ data sample collected with the BESIII [15] detector operating at the BEPCII storage ring [16] to search for the SM forbidden baryonlepton number violating decay J=ψ → Λþc e− (charge conjugation is implied throughout this paper). Based on this analysis, we set an upper bound on the rate of J=ψ → Λþc e−

BESIII DETECTOR AND MONTE CARLO SIMULATION
DATA ANALYSIS
RESULT
Findings
SUMMARY

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