Study of B -> p<(p)over bar>pi pi

K. Chu,M. Z. Wang,I Adachi, H. Aihara,S. Al Said,D. M. Asner,V Aulchenko,T. Aushev, R. Ayad, V Babu,I Badhrees,S. Bahinipati,A. M. Bakich,P. Behera, C. Beleno,J. Bennett,V Bhardwaj,B. Bhuyan, J. Biswal,A. Bobrov, G. Bonvicini, A. Bozek, M. Bracko, M. Campajola,L. Cao,D. Cervenkov,P. Chang,V Chekelian,A. Chen,B. G. Cheon,K. Chilikin,H. E. Cho,K. Cho,S. K. Choi,Y. Choi,S. Choudhury,D. Cinabro,S. Cunliffe,N. Dash,F. Di Capua,S. Di Carlo,Z. Dolezal, V Dong T.,S. Eidelman,D. Epifanov,J. E. Fast, T. Ferber,A. Frey,B. G. Fulsom,R. Garg,V Gaur, N. Gabyshev, A. Garmash,A. Giri, P. Goldenzweig, B. Golob,O. Hartbrich, K. Hayasaka,H. Hayashii,W. S. Hou, C. L. Hsu,T. Iijima, K. Inami,A. Ishikawa, R. Itoh,M. Iwasaki, Y. Iwasaki,W. W. Jacobs,H. B. Jeon, Y. Jin,D. Joffe, K. K. Joo, G. Karyan, T. Kawasaki,D. Y. Kim,S. H. Kim,K. Kinoshita, P. Kodys, S. Korpar, P. Krizan,R. Kroeger,P. Krokovny,R. Kulasiri,Y. J. Kwon,Y. T. Lai,I. S. Lee,S. C. Lee,L. K. Li,L. Li Gioi, J. Libby, K. Lieret, D. Liventsev,T. Luo,M. Masuda, D. Matvienko,M. Merola, K. Miyabayashi, R. Mizuk,G. B. Mohanty, T. Mori, R. Mussa, E. Nakano,T. Nakano, M. Nakao, K. J. Nath, M. Nayak,N. K. Nisar, S. Nishida,K. Nishimura,H. Ono, Y. Onuki,P. Oskin,P. Pakhlov,G. Pakhlova, B. Pal,T. Pang, S. Pardi,C. W. Park,H. Park,S. H. Park,S. Paul,T. K. Pedlar, R. Pestotnik,L. E. Piilonen,V Popov, E. Prencipe,M. T. Prim, P. K. Resmi,M. Ritter, A. Rostomyan,N. Rout,G. Russo,D. Sahoo, Y. Sakai,S. Sandilya, L. Santelj, V Savinov, O. Schneider, G. Schnell, J. Schueler, C. Schwanda, Y. Seino, K. Senyo,M. E. Sevior, C. P. Shen,J. G. Shiu,E. Solovieva, M. Staric,Z. S. Stottler, T. Sumiyoshi, W. Sutcliffe,M. Takizawa,U. Tamponi,K. Tanida, F. Tenchini,T. Uglov, Y. Unno,S. Uno, P. Urquijo,Y. Usov, G. Varner, A. Vinokurova,A. Vossen,B. Wang,C. H. Wang,P. Wang,X. L. Wang,J. Wiechczynski, E. Won, S. B. Yang,H. Ye, J. Yelton, J. H. Yin, Y. Yusa, Z. P. Zhang,V Zhilich,V Zhukova,V Zhulanov

PHYSICAL REVIEW D（2020）

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摘要

Using a data sample of 772 x 10(6) B (B) over bar pairs collected on the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric energy e(+)e(-) collider, we report the observation of B-0 -> p (p) over bar pi(+)pi(-) and the first observation of B+ -> p (p) over bar pi(+)pi(0). We measure a decay branching fraction of (0.83 +/- 0.17 +/- 0.17) x 10(-6) in B-0 -> p (p) over bar pi(+)pi(-) for M pi+pi- < 1.22 GeV/c(2) with a significance of 5.5 standard deviations. The contribution from B-0 -> p (p) over barK(0) is excluded. We measure a decay branching fraction of (4.58 +/- 1.17 +/- 0.67) x 10(-6) for B+ -> p (p) over bar pi(+)pi(0 )with M pi+pi 0 < 1.3 GeV/c(2) with a significance of 5.4 standard deviations. We study the difference of the M-p((p) over bar) distributions in B-0 -> p (p) over bar pi(+)pi(-) and B-0 -> p (p) over bar pi(+)pi(0).

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