Measurement of the branching fraction of the decay B+ -> pi(+) pi(-) l(+) nu(l) in fully reconstructed events at Belle

Beleno, C.; Frey, A.; Adachi, I.; Aihara, H.; Asner, D. M.; Atmacan, H.; Aushev, T.; Ayad, R.; Behera, P.; Bennett, J.; Bernlochner, F.; Bhardwaj, V.; Bilka, T.; Biswal, J.; Bonvicini, G.; Bozek, A.; Bracko, M.; Browder, T. E.; Campajola, M.; Cervenkov, D.; Chang, P.; Chen, A.; Chilikin, K.; Cho, K.; Choi, Y.; Cinabro, D.; Cunliffe, S.; Dash, N.; Di Capua, F.; Dingfelder, J.; Dolezal, Z.; Dong, T. V.; Eidelman, S.; Epifanov, D.; Fast, J. E.; Ferber, T.; Fulsom, B. G.; Garg, R.; Gaur, V.; Gabyshev, N.; Garmash, A.; Giri, A.; Goldenzweig, P.; Guan, Y.; Hartbrich, O.; Hayasaka, K.; Hayashii, H.; Hou, W.-S.; Inami, K.; Ishikawa, A.; Iwasaki, M.; Jacobs, W. W.; Jeon, H. B.; Jin, Y.; Joo, K. K.; Kiesling, C.; Kim, B. H.; Kim, D. Y.; Kim, K.-H.; Kim, S. H.; Kim, Y.-K.; Kimmel, T. D.; Kinoshita, K.; Kodys, P.; Korpar, S.; Kotchetkov, D.; Krizan, P.; Kroeger, R.; Krokovny, P.; Kuhr, T.; Kulasiri, R.; Kumar, R.; Kuzmin, A.; Kwon, Y.-J.; Lalwani, K.; Lee, S. C.; Li, L. K.; Li, Y. B.; Li Gioi, L.; Libby, J.; Lieret, K.; Liventsev, D.; Luo, T.; MacNaughton, J.; MacQueen, C.; Masuda, M.; Matsuda, T.; Merola, M.; Miyabayashi, K.; Mohanty, G. B.; Moon, T. J.; Mori, T.; Mrvar, M.; Nakao, M.; Nisar, N. K.; Nishida, S.; Ogawa, S.; Ono, H.; Oskin, P.; Pakhlov, P.; Pakhlova, G.; Pardi, S.; Park, H.; Patra, S.; Pedlar, T. K.; Pestotnik, R.; Piilonen, L. E.; Podobnik, T.; Prencipe, E.; Prim, M. T.; Rostomyan, A.; Rout, N.; Russo, G.; Sahoo, D.; Sakai, Y.; Sandilya, S.; Sangal, A.; Sanuki, T.; Savinov, V.; Schnell, G.; Schwanda, C.; Schwartz, A. J.; Schwenker, B.; Seino, Y.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shiu, J.-G.; Shwartz, B.; Sokolov, A.; Solovieva, E.; Staric, M.; Stottler, Z. S.; Strube, J. F.; Sumiyoshi, T.; Sutcliffe, W.; Takizawa, M.; Tanida, K.; Tenchini, F.; Uchida, M.; Uglov, T.; Uno, S.; Urquijo, P.; Vahsen, S. E.; Vonder, R. van; Varner, G.; Varvell, K. E.; Wang, C. H.; Wang, E.; Wang, M.-Z.; Wang, P.; Wang, X. L.; Watanabe, M.; Won, E.; Xu, X.; Yan, W.; Yang, S. B.; Ye, H.; Yusa, Y.; Zhang, Z. P.; Zhilich, V. und Zhukova, V. (2021): Measurement of the branching fraction of the decay B+ -> pi(+) pi(-) l(+) nu(l) in fully reconstructed events at Belle. In: Physical Review D, Bd. 103, Nr. 11, 112001

Abstract

We present an analysis of the exclusive B+ -> pi(+) pi(-) l(+) nu(l) decay, where l represents an electron or a muon, with the assumption of charge-conjugation symmetry and lepton universality. The study exploits the full gamma (4S) data sample collected by the Belle detector, corresponding to 711 fb(-1) of integrated luminosity. Events are selected by fully reconstructing one B meson in hadronic decay modes, subsequently determining the properties of the other B meson. We extract the signal yields using a binned maximum-likelihood fit to the missing-mass squared distribution in bins of the invariant mass of the two pions or the momentum transfer squared. We measure a total branching fraction of B(B+ -> pi(+) pi(-) l(+) nu(l)) = [22.7(-1.6)(+1.9) (stat) +/- 3.5(syst) x 10(-5), where the uncertainties are statistical and systematic, respectively. This result is the first reported measurement of this decay.

• Dokumententyp: Zeitschriftenartikel
• Fakultät: Physik
• Themengebiete: 500 Naturwissenschaften und Mathematik > 530 Physik
• ISSN: 2470-0010
• Sprache: Englisch