Observation of B- to pbar Lambda D0 at Belle

P. Chen; M.-Z. Wang; I. Adachi; H. Aihara; D. M. Asner; V. Aulchenko,; T. Aushev; A. M. Bakich; E. Barberio; K. Belous; B. Bhuyan; A. Bozek; M.; Bra\v{c}ko; T. E. Browder; M.-C. Chang; P. Chang; Y. Chao; A. Chen; B. G.; Cheon; I.-S. Cho; K. Cho; Y. Choi; J. Dalseno; M. Danilov; Z. Dole\v{z}al; Z.; Dr\'asal; S. Eidelman; J. E. Fast; M. Feindt; V. Gaur; Y. M. Goh; J. Haba; T.; Hara; K. Hayasaka; H. Hayashii; Y. Hoshi; W.-S. Hou; Y. B. Hsiung; H. J.; Hyun; A. Ishikawa; R. Itoh; M. Iwabuchi; Y. Iwasaki; T. Iwashita; T. Julius,; J. H. Kang; P. Kapusta; N. Katayama; T. Kawasaki; H. Kichimi; C. Kiesling; H.; O. Kim; J. B. Kim; J. H. Kim; K. T. Kim; M. J. Kim; Y. J. Kim; K. Kinoshita,; B. R. Ko; N. Kobayashi; S. Koblitz; P. Kri\v{z}an; T. Kuhr; A. Kuzmin; Y.-J.; Kwon; J. S. Lange; S.-H. Lee; J. Li; Y. Li; J. Libby; C. Liu; Y. Liu; D.; Liventsev; R. Louvot; D. Matvienko; S. McOnie; H. Miyata; Y. Miyazaki; G. B.; Mohanty; Y. Nagasaka; E. Nakano; M. Nakao; Z. Natkaniec; S. Neubauer; S.; Nishida; O. Nitoh; S. Ogawa; T. Ohshima; S. L. Olsen; Y. Onuki; P. Pakhlov,; G. Pakhlova; H. Park; H. K. Park; T. K. Pedlar; R. Pestotnik; M. Peters; M.; Petri\v{c}; L. E. Piilonen; M. Ritter; M. R\"ohrken; S. Ryu; H. Sahoo; Y.; Sakai; T. Sanuki; O. Schneider; C. Schwanda; K. Senyo; M. E. Sevior; M.; Shapkin; C. P. Shen; T.-A. Shibata; J.-G. Shiu; B. Shwartz; F. Simon; J. B.; Singh; P. Smerkol; Y.-S. Sohn; E. Solovieva; S. Stani\v{c}; M. Stari\v{c}; M.; Sumihama; T. Sumiyoshi; G. Tatishvili; Y. Teramoto; M. Uchida; S. Uehara; Y.; Unno; S. Uno; G. Varner; K. E. Varvell; C. H. Wang; X. L. Wang; Y. Watanabe,; K. M. Williams; E. Won; B. D. Yabsley; Y. Yamashita; M. Yamauchi; Z. P. Zhang

arXiv:1108.4271·hep-ex·May 30, 2015

Observation of B- to pbar Lambda D0 at Belle

P. Chen, M.-Z. Wang, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko,, T. Aushev, A. M. Bakich, E. Barberio, K. Belous, B. Bhuyan, A. Bozek, M., Bra\v{c}ko, T. E. Browder, M.-C. Chang, P. Chang, Y. Chao, A. Chen, B. G., Cheon, I.-S. Cho, K. Cho, Y. Choi, J. Dalseno, M. Danilov

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TL;DR

This paper reports the first observation of the B- to pbar Lambda D0 decay with a significant branching fraction, using a large data sample from Belle, and sets upper limits for related decay modes.

Contribution

First observation of B- to pbar Lambda D0 decay with measured branching fraction using Belle data.

Findings

01

Branching fraction for B- to pbar Lambda D0 is (1.43+0.28-0.25 +- 0.18)*10^-5.

02

Significance of the B- to pbar Lambda D0 signal is 8.1 standard deviations.

03

No significant signal for B- to pbar Lambda D*0; upper limit set at 4.8*10^-5.

Abstract

We study B- meson decays to pbar Lambda D(*)0 final states using a sample of 657 * 10^6 B Bbar events collected at the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+ e- collider. The observed branching fraction for B- to pbar Lambda D0 is (1.43^ +0.28_-0.25 +- 0.18)*10^-5. with a significance of 8.1 standard deviations, where the uncertainties are statistical and systematic, respectively. Most of the signal events have the pbarLambda mass peaking near threshold. No significant signal is observed for B- to pbar Lambda D*0 and the corresponding upper limit on the branching fraction is 4.8 * 10^-5 at the 90% confidence level.

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