Search for the Lepton-Flavor-Violating Decay $B^{0}\to K^{\ast 0} \mu^{\pm} e^{\mp}$

S. Sandilya,K. Trabelsi,A. J. Schwartz,I. Adachi, H. Aihara,S. Al Said,D. M. Asner,H. Atmacan,V. Aulchenko,T. Aushev,R. Ayad, V. Babu,I. Badhrees,S. Bahinipati,A. M. Bakich,V. Bansal, P. K. Behera, C. Beleño,V. Bhardwaj,B. Bhuyan, T. Bilka,J. Biswal,A. Bobrov,A. Bozek, M. Bračko,T. E. Browder,L. Cao, D. Červenkov,P. Chang, V. Chekelian,A. Chen,B. G. Cheon,K. Chilikin,K. Cho,S.-K. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,N. Dash,S. Di Carlo,J. Dingfelder,Z. Doležal, T. V. Dong, Z. Drásal,S. Eidelman,D. Epifanov,J. Fast, T. Ferber,B. G. Fulsom,R. Garg,V. Gaur, N. Gabyshev, A. Garmash,M. Gelb,A. Giri, P. Goldenzweig,B. Golob, D. Greenwald, Y. Guan, J. Haba, T. Hara,K. Hayasaka,H. Hayashii, S. Hirose,W.-S. Hou,C. L. Hsu,T. Iijima, K. Inami, G. Inguglia,A. Ishikawa, R. Itoh,M. Iwasaki, Y. Iwasaki,W. W. Jacobs, I. Jaegle,H. B. Jeon, S. Jia, Y. Jin,D. Joffe, K. K. Joo,T. Julius,A. B. Kaliyar,K. H. Kang,T. Kawasaki,H. Kichimi, C. Kiesling,D. Y. Kim,J. B. Kim,K. T. Kim, S. H. Kim,K. Kinoshita,P. Kodys,S. Korpar, D. Kotchetkov,P. Križan,R. Kroeger,P. Krokovny,T. Kuhr,R. Kulasiri,R. Kumar, A. Kuzmin, Y. Kwon, J. S. Lange,I. S. Lee,S.C. Lee,L. Li,Yongmin Li,L. Li Gioi, J. Libby, D. Liventsev,M. Lubej,M. Masuda,T. Matsuda,D. Matvienko,M. Merola, K. Miyabayashi,H. Miyata, R. Mizuk,G. B. Mohanty,H. K. Moon, T. Mori, R. Mussa, E. Nakano, Michiyasu Nakao,T. Nanut, K. J. Nath, Z. Natkaniec, M. Nayak, M. Niiyama,N. K. Nisar, S. Nishida,K. Ogawa,S. Ogawa,H. Ono,P. Pakhlov, G. Pakhlova,B. K. Pal, S. Pardi,S. Paul,T. K. Pedlar, R. Pestotnik,L. E. Piilonen,V. Popov,K. Prasanth, E. Prencipe, M. V. Purohit,A. Rabusov,P.K. Resmi, A. Rostomyan,G. Russo,D. Sahoo, Y. Sakai,M. Salehi, L. Santelj, T. Sanuki, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, Y. Seino,K. Senyo,O. Seon,M. E. Sevior, C. P. Shen,T.-A. Shibata,J. G. Shiu, B. Shwartz,J. B. Singh,A. Sokolov, E. Solovieva, M. Starič, J. Strube, M. Sumihama,K. Sumisawa, T. Sumiyoshi,W. Sutcliffe,M. Takizawa,U. Tamponi,K. Tanida, F. Tenchini,M. Uchida,T. Uglov, Y. Unno,S. Uno, P. Urquijo,Y. Ushiroda,Y. Usov,C. Van Hulse,R. Van Tonder, G. Varner, A. Vinokurova,V. Vorobyev,E. Waheed,B. Wang,C. H. Wang,M. Wang, P. Wang,X. Wang,S. Watanuki, S. Wehle,E. Widmann, E. Won, H. Yamamoto,H. Ye, J.H. Yin, C. Z. Yuan, Y. Yusa, Z. P. Zhang,V. Zhilich,V. Zhukova,V. Zhulanov, A. Zupanc

PHYSICAL REVIEW D(2018)

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摘要
We have searched for the lepton-flavor-violating decay B-0 -> K-*0 mu(+/-)e(-/+) using a data sample of 711 fb(-1) that contains 772 x 10(6) B (B) over bar pairs. The data were collected near the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+) e(-) collider. No signals were observed, and we set 90% confidence level upper limits on the branching fractions of B(B-0 -> K-*0 mu(+)e(-)) < 1.2 x 10(-7), B(B-0 -> K-*0 mu(-)e(+)) < 1.6 x 10(-7), and, for both decays combined, B(B-0 -> K-*0 mu(+/-)e(-/+)) < 1.8 x 10(-7). These are the most stringent limits on these decays to date.
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