Search for a massive invisible particleX0inB+→e+X0andB+→μ+X0decays

C.-S Park,J Stypula,A Moll,A Rostomyan,S Sandilya,S Okuno,G Bonvicini,N Gabyshev,Y Choi,M Heck,M Starič,M Uchida,O Grzymkowska,Y Usov,T Aushev,C Pulvermacher,O Seon,V Bhardwaj,M Masuda,T Uglov,R Chistov,A Chen,S Eidelman,D Liventsev,C Schwanda,V Chekelian,H Miyata,G Schnell,S Ogawa,V Chobanova,K Kinoshita,P Vanhoefer,Y Teramoto,Y Watanabe,Y Sakai,Y Li,T Sumiyoshi,K Chilikin,A Kuzmin,T Ferber,Y Iwasaki,R Itoh,J Dalseno,K Inami,A Zupanc,A Ishikawa,V Babu,L Li Gioi,P Goldenzweig,U Tamponi,P Krokovny,D Cinabro,P Križan,S Uno,Y Seino,M Nakao,D Semmler,V Gaur,K Miyabayashi,K Senyo,T Hara,H Park,G Pakhlova,D Červenkov,P Katrenko,Y Yusa,M Bračko,E Kato,J Libby,H Farhat,S Korpar,M Danilov,R Mizuk,I Badhrees,R Mussa,R Gillard,Y Yook,J Yamaoka,M Nayak,D Matvienko,P Pakhlov,S Nishida,E Won,K Hayasaka,M Lubej,E Nakano,O Schneider,T Iijima,B Shwartz,T Julius,K Trabelsi,S Yashchenko,Z Doležal,I Adachi,N Dash,T Schlüter,G Inguglia,T Sanuki,H Hayashii,A Garmash,K J Nath ,Y Sato,K E Varvell ,T E Browder ,D Dutta,Z.p Zhang ,M N Wagner ,J G Shiu ,M.-Z Wang,J.b Kim ,A M Bakich ,P Urquijo,J E Fast ,S.h Kim ,H B Jeon ,M V Purohit ,V Zhilich,Jyoti Prakash Biswal ,P Kodyš,H Ye,N K Nisar ,F Simon,G B Mohanty ,C.w Park ,M Ritter,V Shebalin,C.h Wang ,P Wang,C P Shen ,C Van Hulse,P Lukin,P K Behera ,W.-S Hou,I.s Lee ,C.h Li ,S Mohanty,S Ryu,T K Pedlar ,D M Asner ,T A Shibata ,D.y Kim ,J Rauch,H Aihara,K.t Kim ,I Jaeglé ,L Šantelj ,L E Piilonen ,V Zhulanov,G Varner,E Barberio,S Stanič,K Cho,A Sokolov,B G Fulsom ,B G Cheon ,Y Kwon ,H K Moon ,Y M Goh ,M.j Kim ,B Pal,M E Sevior ,Y Unno,K H Kang ,M Petrič,A Bożek ,K Negishi,A J Schwartz ,L Li

doi:10.1103/physrevd.94.012003

Abstract

We present a search for a non-Standard-Model invisible particle X-0 in the mass range 0.1-1.8 GeV/c(2) in B+ -> e(+)X(0) and B+ -> mu X-+(0) decays. The results are obtained from a 711 fb(-1) data sample that corresponds to 772 x 10(6) B (B) over bar pairs, collected at the Upsilon(4S) resonance with the Belle detector at the KEKB e(+)e(-) collider. One B meson is fully reconstructed in a hadronic mode to determine the momentum of the lepton of the signal decay in the rest frame of the recoiling partner B meson. We find no evidence of a signal and set upper limits on the order of 10(-6).

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