Phys. Rev. D
80,
111103(R)
(2009)
[6 pages]
Observation of B+→pΛ̅ π+π- at Belle
P. Chen et al.
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P. Chen25, M.-Z. Wang25, H. Aihara39, A. M. Bakich35, V. Balagura11, V. Bhardwaj31, M. Bischofberger22, A. Bozek26, M. Bračko18,12, T. E. Browder7, M.-C. Chang4, P. Chang25, A. Chen23, B. G. Cheon6, I.-S. Cho42, Y. Choi34, J. Dalseno19,36, M. Danilov11, M. Dash41, S. Eidelman1,29, N. Gabyshev1,29, P. Goldenzweig3, B. Golob17,12, B.-Y. Han14, T. Hara8, H. Hayashii22, Y. Hoshi38, W.-S. Hou25, H. J. Hyun15, T. Iijima21, K. Inami21, R. Itoh8, Y. Iwasaki8, J. H. Kang42, N. Katayama8, H. Kawai2, H. Kichimi8, H. J. Kim15, H. O. Kim15, Y. I. Kim15, Y. J. Kim5, B. R. Ko14, S. Korpar18,12, P. Križan17,12, P. Krokovny8, Y.-J. Kwon42, S.-H. Kyeong42, M. J. Lee33, S.-H. Lee14, C. Liu32, Y. Liu21, D. Liventsev11, R. Louvot16, A. Matyja26, S. McOnie35, H. Miyata28, Y. Miyazaki21, R. Mizuk11, E. Nakano30, M. Nakao8, S. Nishida8, S. Ogawa37, T. Ohshima21, S. Okuno13, G. Pakhlova11, C. W. Park34, H. K. Park15, L. S. Peak35, R. Pestotnik12, M. Peters7, M. Petrič12, L. E. Piilonen41, A. Poluektov1,29, B. Reisert19, H. Sahoo7, Y. Sakai8, O. Schneider16, K. Senyo21, M. E. Sevior20, M. Shapkin10, V. Shebalin1,29, C. P. Shen7, J.-G. Shiu25, F. Simon19,36, P. Smerkol12, A. Sokolov10, E. Solovieva11, M. Starič12, T. Sumiyoshi40, Y. Teramoto30, K. Trabelsi8, T. Tsuboyama8, Y. Unno6, S. Uno8, P. Urquijo20, G. Varner7, K. E. Varvell35, A. Vinokurova1,29, C. H. Wang24, P. Wang9, Y. Watanabe13, R. Wedd20, J.-T. Wei25, E. Won14, B. D. Yabsley35, Y. Yamashita27, C. Z. Yuan9, Z. P. Zhang32, V. Zhilich1,29, V. Zhulanov1,29, T. Zivko12, and A. Zupanc12 (Belle Collaboration)
1Budker Institute of Nuclear Physics, Novosibirsk
2Chiba University, Chiba
3University of Cincinnati, Cincinnati, Ohio 45221
4Department of Physics, Fu Jen Catholic University, Taipei
5The Graduate University for Advanced Studies, Hayama
6Hanyang University, Seoul
7University of Hawaii, Honolulu, Hawaii 96822
8High Energy Accelerator Research Organization (KEK), Tsukuba
9Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
10Institute of High Energy Physics, Protvino
11Institute for Theoretical and Experimental Physics, Moscow
12J. Stefan Institute, Ljubljana
13Kanagawa University, Yokohama
14Korea University, Seoul
15Kyungpook National University, Taegu
16École Polytechnique Fédérale de Lausanne (EPFL), Lausanne
17Faculty of Mathematics and Physics, University of Ljubljana, Ljubljana
18University of Maribor, Maribor
19Max-Planck-Institut für Physik, München
20University of Melbourne, School of Physics, Victoria 3010
21Nagoya University, Nagoya
22Nara Women’s University, Nara
23National Central University, Chung-li
24National United University, Miao Li
25Department of Physics, National Taiwan University, Taipei
26H. Niewodniczanski Institute of Nuclear Physics, Krakow
27Nippon Dental University, Niigata
28Niigata University, Niigata
29Novosibirsk State University, Novosibirsk
30Osaka City University, Osaka
31Panjab University, Chandigarh
32University of Science and Technology of China, Hefei
33Seoul National University, Seoul
34Sungkyunkwan University, Suwon
35School of Physics, University of Sydney, NSW 2006
36Excellence Cluster Universe, Technische Universität München, Garching
37Toho University, Funabashi
38Tohoku Gakuin University, Tagajo
39Department of Physics, University of Tokyo, Tokyo
40Tokyo Metropolitan University, Tokyo
41IPNAS, Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061
42Yonsei University, Seoul
Received 30 October 2009; published 14 December 2009
We study charmless B+ meson decays to the pΛ̅ π+π- final state using a 605 fb-1 data sample collected at the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider. There are significant signals found with the pΛ̅ mass peaking near threshold. The observed branching fraction for nonresonant B+→pΛ̅ π+π- is (5.92-0.84+0.88(stat)±0.69(syst))×10-6 with a significance of 9.1 standard deviations. We also observe the intermediate three-body decay B+→pΛ̅ ρ0 with a branching fraction of (4.78-0.64+0.67(stat)±0.60(syst))×10-6 and a significance of 9.5 standard deviations, and find a hint of a B+→pΛ̅ f2(1270) signal. No other intermediate three-body decay is found in this study.
© 2009 The American Physical Society
URL:
http://link.aps.org/doi/10.1103/PhysRevD.80.111103
DOI:
10.1103/PhysRevD.80.111103
PACS:
13.25.Hw, 13.30.Eg, 14.40.Nd
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