A search for the lepton family number violating decay D 0→ μe

J Becker ,L Köpke,A Seiden,B Nemati,V Cook,T Freese,A Li,G Eigen,R Partridge,D Pitman,U Mallik,J Perrier,W Stockhausen,R Xu,A Wattenberg,B Tripsas,F Villa,F Grancagnolo,M Scarlatella,C Simopoulos,D Wisinski,W S Lockman ,D G Hitlin ,D M Coffman ,C G Matthews ,A Odian ,C Grab ,G Wolf ,H F-W Sadrozinski ,S Wasserbaech ,J M Izen ,A J Weinstein ,N Wermes ,R Cassell ,D Coward ,T Bolton ,D E Dorfan ,P Mockett ,K Einsweiler ,A L Duncan ,R P Hamilton ,J Hauser ,R F Mozley ,G P Dubois ,A L Spadafora ,K O Bunnell ,J J Thaler ,G E Gladding ,W J Wisniewski ,T Schalk ,J D Richman ,I E Stockdale ,S A Plaetzer ,H J Willutzki ,G Blaylock ,B I Eisenstein ,R H Schindler ,C A Heusch ,J S Brown ,W H Toki ,T H Burnett ,Y S Zhu

doi:10.1016/0370-2693(87)90473-4

Abstract

A search for the lepton family number violating decay D 0→ μe is reported. No signal is observed in a data sample of 9.3 pb −1 collected at the ζ (3770) resonance with the MARK III detector, where 0.18±0.06±0.05 background events are expected. A 90% confidence level upper limit on the branching fraction B(D 0→ μe) of 1.5 × 10 −4 is obtained.

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