Observation of B0→ΛΛ¯K0 and B0→ΛΛ¯K*0 at Belle
Chang, Y.-W.; Wang, M.-Z.; Adachi, I.; Aihara, H.; Aushev, T.; Bakich, A.; Balagura, V.; Bay, A.; Bhardwaj, V.; Bitenc, U.; Bondar, A.; Bozek, A.; Bračko, M.; Browder, T.; Chao, Y.; Chen, A.; Chistov, R.; Choi, Y.; Dalseno, J.; Danilov, M.; Dash, M.; Drutskoy, A.; Eidelman, S.; Goldenzweig, P.; Ha, H.; Han, B.-Y.; Hara, T.; Hayasaka, K.; Hayashii, H.; Hazumi, M.; Heffernan, D.; Horii, Y.; Hoshi, Y.; Hou, W.-S.; Hyun, H.; Inami, K.; Ishikawa, A.; Iwasaki, M.; Iwasaki, Y.; Joshi, N.; Kah, D.; Kang, J.; Kawai, H.; Kawasaki, T.; Kichimi, H.; Kim, H.; Kim, Y.; Kim, Y.; Ko, B.; Korpar, S.; Križan, P.; Kwon, Y.-J.; Kyeong, S.-H.; Lee, J.; Lee, M.; Lee, S.; Lesiak, T.; Limosani, A.; Lin, S.-W.; Liu, C.; Liu, Y.; Louvot, R.; Mandl, F.; Matyja, A.; Mconie, S.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Nagasaka, Y.; Nakao, M.; Natkaniec, Z.; Nishida, S.; Nitoh, O.; Ogawa, S.; Okuno, S.; Ozaki, H.; Pakhlov, P.; Pakhlova, G.; Park, C.; Park, H.; Park, K.; Peak, L.; Pestotnik, R.; Piilonen, L.; Rozanska, M.; Sahoo, H.; Sakai, Y.; Schneider, O.; Sekiya, A.; Senyo, K.; Shapkin, M.; Shiu, J.-G.; Shwartz, B.; Singh, J.; Stanič, S.; Starič, M.; Sumisawa, K.; Tanaka, M.; Taylor, G.; Teramoto, Y.; Tikhomirov, I.; Uehara, S.; Uglov, T.; Unno, Y.; Uno, S.; Usov, Y.; Varner, G.; Vervink, K.; Wang, C.; Wang, P.; Wang, X.; Watanabe, Y.; Wedd, R.; Wei, J.-T.; Won, E.; Yabsley, B.; Yamashita, Y.; Zhang, Z.; Zhilich, V.; Zivko, T.; Zupanc, A.; Zyukova, O.; Belle Collaboration
2009

Abstract

We study the charmless decays B -> Lambda(Lambda) over barh , where h stands for pi(+), K+, K-0, K*(+), or K*(0), using a 605 fb(-1) data sample collected at the Gamma(4S) resonance with the Belle detector at the KEKB asymmetric energy e(+)e(-) collider. We observe B-0 -> Lambda(Lambda) over barK(0) and B-0 -> Lambda(Lambda) over barK*(0) with branching fractions of (4.76(-0.68)(+0.84) (stat) +/- 0. 61 (syst)) x 10(-6) and (2.46(-0.72)(+0.87) +/- 0.34) x 10(-6), respectively. The significances of these signals in the threshold-mass enhanced mass region, M Lambda(Lambda) over bar < 2.85 GeV / c(2), are 12.4 sigma and 9.3 sigma, respectively. We also update the branching fraction B(B+ -> Lambda<(Lambda)over bar>K+) = (3.38(-0.36)(+0.41) +/- 0.41) x 10(-6) with better accuracy, and report the following measurement or 90% confidence level upper limit in the threshold-mass-enhanced region: B(B+ -> Lambda(Lambda) over barK*(+)) = (2.19(-0.88)(+1.13) +/- 0.33) x 10(-6) with 3.7 sigma significance; B(B+ -> Lambda(Lambda) over bar pi(+)) < 0.94) x 10(-6). A related search for B-0 -> Lambda<(Lambda)over bar>(D) over bar0 yields a branching fraction B(B-0 -> Lambda(Lambda) over bar(D) over bar (0)) = (1.05(-0.44)(+0.57) +/- 0.14) x 10(-5). This may be compared with the large, similar to 10(-4), branching fraction observed for B-0 -> p (p) over bar(D) over bar (0). . The M Lambda(Lambda) over bar enhancements near threshold and related angular distributions for the observed modes are also reported.

Details

Title Observation of B0→ΛΛ¯K0 and B0→ΛΛ¯K*0 at Belle
Author(s) Chang, Y.-W. ; Wang, M.-Z. ; Adachi, I. ; Aihara, H. ; Aushev, T. ; Bakich, A. ; Balagura, V. ; Bay, A. ; Bhardwaj, V. ; Bitenc, U. ; Bondar, A. ; Bozek, A. ; Bračko, M. ; Browder, T. ; Chao, Y. ; Chen, A. ; Chistov, R. ; Choi, Y. ; Dalseno, J. ; Danilov, M. ; Dash, M. ; Drutskoy, A. ; Eidelman, S. ; Goldenzweig, P. ; Ha, H. ; Han, B.-Y. ; Hara, T. ; Hayasaka, K. ; Hayashii, H. ; Hazumi, M. ; Heffernan, D. ; Horii, Y. ; Hoshi, Y. ; Hou, W.-S. ; Hyun, H. ; Inami, K. ; Ishikawa, A. ; Iwasaki, M. ; Iwasaki, Y. ; Joshi, N. ; Kah, D. ; Kang, J. ; Kawai, H. ; Kawasaki, T. ; Kichimi, H. ; Kim, H. ; Kim, Y. ; Kim, Y. ; Ko, B. ; Korpar, S. ; Križan, P. ; Kwon, Y.-J. ; Kyeong, S.-H. ; Lee, J. ; Lee, M. ; Lee, S. ; Lesiak, T. ; Limosani, A. ; Lin, S.-W. ; Liu, C. ; Liu, Y. ; Louvot, R. ; Mandl, F. ; Matyja, A. ; Mconie, S. ; Miyabayashi, K. ; Miyata, H. ; Miyazaki, Y. ; Mizuk, R. ; Nagasaka, Y. ; Nakao, M. ; Natkaniec, Z. ; Nishida, S. ; Nitoh, O. ; Ogawa, S. ; Okuno, S. ; Ozaki, H. ; Pakhlov, P. ; Pakhlova, G. ; Park, C. ; Park, H. ; Park, K. ; Peak, L. ; Pestotnik, R. ; Piilonen, L. ; Rozanska, M. ; Sahoo, H. ; Sakai, Y. ; Schneider, O. ; Sekiya, A. ; Senyo, K. ; Shapkin, M. ; Shiu, J.-G. ; Shwartz, B. ; Singh, J. ; Stanič, S. ; Starič, M. ; Sumisawa, K. ; Tanaka, M. ; Taylor, G. ; Teramoto, Y. ; Tikhomirov, I. ; Uehara, S. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Usov, Y. ; Varner, G. ; Vervink, K. ; Wang, C. ; Wang, P. ; Wang, X. ; Watanabe, Y. ; Wedd, R. ; Wei, J.-T. ; Won, E. ; Yabsley, B. ; Yamashita, Y. ; Zhang, Z. ; Zhilich, V. ; Zivko, T. ; Zupanc, A. ; Zyukova, O. ; Belle Collaboration
Published in Physical Review D
Volume 79
Issue 5
Pages 052006
Date 2009
ISSN 1550-2368
Keywords
DOI https://doi.org/10.1103/PhysRevD.79.052006
Other identifier(s) View record in Web of Science
Laboratories LPHE
Record Appears in Scientific production and competences > SB - School of Basic Sciences > IPHYS - Institute of Physics > LPHE - High Energy Physics Laboratory
Peer-reviewed publications
Work produced at EPFL
Journal Articles
Published
Record creation date 2010-11-05

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