Observation of B^{+}→pΛ[over ¯]π^{+}π^{-} at Belle

Chen, P.; Wang, M.-Z.; Aihara, H.; Bakich, A. M.; Balagura, V.; Bhardwaj, V.; Bischofberger, M.; Bozek, A.; Bračko, M.; Browder, T. E.; Chang, M.-C.; Chang, P.; Chen, A.; Cheon, B. G.; Cho, I.-S.; Choi, Y.; Dalseno, J.; Danilov, M.; Dash, M.; Eidelman, S.; Gabyshev, N.; Goldenzweig, P.; Golob, B.; Han, B.-Y.; Hara, T.; Hayashii, H.; Hoshi, Y.; Hou, W.-S.; Hyun, H. J.; Iijima, T.; Inami, K.; Itoh, R.; Iwasaki, Y.; Kang, J. H.; Katayama, N.; Kawai, H.; Kichimi, H.; Kim, H. J.; Kim, H. O.; Kim, Y. I.; Kim, Y. J.; Ko, B. R.; Korpar, S.; Križan, P.; Krokovny, P.; Kwon, Y.-J.; Kyeong, S.-H.; Lee, M. J.; Lee, S.-H.; Liu, C.; Liu, Y.; Liventsev, D.; Louvot, R.; Matyja, A.; Mconie, S.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Nakano, E.; Nakao, M.; Nishida, S.; Ogawa, S.; Ohshima, T.; Okuno, S.; Pakhlova, G.; Park, C. W.; Park, H. K.; Peak, L. S.; Pestotnik, R.; Peters, M.; Petrič, M.; Piilonen, L. E.; Poluektov, A.; Reisert, B.; Sahoo, H.; Sakai, Y.; Schneider, O.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shebalin, V.; Shen, C. P.; Shiu, J.-G.; Simon, F.; Smerkol, P.; Sokolov, A.; Solovieva, E.; Starič, M.; Sumiyoshi, T.; Teramoto, Y.; Trabelsi, K.; Tsuboyama, T.; Unno, Y.; Uno, S.; Urquijo, P.; Varner, G.; Varvell, K. E.; Vinokurova, A.; Wang, C. H.; Wang, P.; et al.

doi:10.1103/PhysRevD.80.111103

research article

Observation of B^{+}→pΛ[over ¯]π^{+}π^{-} at Belle

Chen, P.

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Wang, M.-Z.

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Aihara, H.

2009

Physical Review D [1970-2015]

We study charmless B+ meson decays to the p Lambda pi(+)pi(-) final state using a 605 fb(-1) data sample collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e(+)e(-) collider. There are significant signals found with the p Lambda mass peaking near threshold. The observed branching fraction for nonresonant B+-> p Lambda pi(+)pi(-) is (5.92(-0.84)(+0.88)(stat)+/- 0.69(syst))x10(-6) with a significance of 9.1 standard deviations. We also observe the intermediate three-body decay B+-> p Lambda rho(0) with a branching fraction of (4.78(-0.64)(+0.67)(stat)+/- 0.60(syst))x10(-6) and a significance of 9.5 standard deviations, and find a hint of a B+-> p Lambda f(2)(1270) signal. No other intermediate three-body decay is found in this study.