Rapid Communication
Access by Xinjiang University

Observation of the decay ${\bar{B}}^{0} \to D_{s}^{+} Λ \bar{p}$

T. Medvedeva¹, R. Chistov¹, K. Abe², K. Abe³, I. Adachi², H. Aihara⁴, D. Anipko⁵, T. Aushev^1,6, A. M. Bakich⁷ et al. (Belle Collaboration)

A. M. Bakich⁷, V. Balagura¹, E. Barberio⁸, A. Bay⁶, K. Belous⁹, U. Bitenc¹⁰, I. Bizjak¹⁰, A. Bondar⁵, A. Bozek¹¹, M. Bračko^2,10,12, J. Brodzicka¹¹, T. E. Browder¹³, M.-C. Chang¹⁴, P. Chang¹⁵, Y. Chao¹⁵, A. Chen¹⁶, W. T. Chen¹⁶, B. G. Cheon¹⁷, Y. Choi¹⁸, Y. K. Choi¹⁸, S. Cole⁷, J. Dalseno⁸, M. Danilov¹, M. Dash¹⁹, A. Drutskoy²⁰, S. Eidelman⁵, S. Fratina¹⁰, N. Gabyshev⁵, A. Garmash²¹, T. Gershon², A. Go¹⁶, B. Golob^10,22, H. Ha²³, J. Haba², K. Hayasaka²⁴, H. Hayashii²⁵, M. Hazumi², D. Heffernan²⁶, T. Hokuue²⁴, Y. Hoshi³, S. Hou¹⁶, W.-S. Hou¹⁵, T. Iijima²⁴, A. Imoto²⁵, K. Inami²⁴, A. Ishikawa⁴, R. Itoh², M. Iwasaki⁴, Y. Iwasaki², J. H. Kang²⁷, H. Kawai²⁸, T. Kawasaki²⁹, H. R. Khan³⁰, H. Kichimi², Y. J. Kim³¹, P. Krokovny², R. Kulasiri²⁰, R. Kumar³², C. C. Kuo¹⁶, Y.-J. Kwon²⁷, G. Leder³³, M. J. Lee³⁴, S. E. Lee³⁴, T. Lesiak¹¹, S.-W. Lin¹⁵, D. Liventsev¹, G. Majumder³⁵, F. Mandl³³, T. Matsumoto³⁶, S. McOnie⁷, W. Mitaroff³³, H. Miyake²⁶, H. Miyata²⁹, Y. Miyazaki²⁴, R. Mizuk¹, G. R. Moloney⁸, T. Mori²⁴, Y. Nagasaka³⁷, M. Nakao², Z. Natkaniec¹¹, S. Nishida², O. Nitoh³⁸, S. Ogawa³⁹, T. Ohshima²⁴, S. Okuno⁴⁰, Y. Onuki⁴¹, H. Ozaki², P. Pakhlov¹, G. Pakhlova¹, H. Park⁴², K. S. Park¹⁸, L. S. Peak⁷, R. Pestotnik¹⁰, L. E. Piilonen¹⁹, H. Sahoo¹³, Y. Sakai², N. Satoyama⁴³, T. Schietinger⁶, O. Schneider⁶, R. Seidl^41,44, K. Senyo²⁴, M. E. Sevior⁸, M. Shapkin⁹, H. Shibuya³⁹, J. B. Singh³², A. Sokolov⁹, A. Somov²⁰, N. Soni³², S. Stanič⁴⁵, M. Starič¹⁰, H. Stoeck⁷, T. Sumiyoshi³⁶, F. Takasaki², K. Tamai², M. Tanaka², G. N. Taylor⁸, Y. Teramoto⁴⁶, X. C. Tian⁴⁷, I. Tikhomirov¹, T. Tsuboyama², T. Tsukamoto², S. Uehara², T. Uglov¹, K. Ueno¹⁵, Y. Unno¹⁷, S. Uno², P. Urquijo⁸, Y. Usov⁵, G. Varner¹³, S. Villa⁶, C. C. Wang¹⁵, C. H. Wang⁴⁸, Y. Watanabe³⁰, E. Won²³, Q. L. Xie⁴⁹, A. Yamaguchi⁵⁰, Y. Yamashita⁵¹, M. Yamauchi², Z. P. Zhang⁵², and A. Zupanc¹⁰ (Belle Collaboration)

¹Institute for Theoretical and Experimental Physics, Moscow
²High Energy Accelerator Research Organization (KEK), Tsukuba
³Tohoku Gakuin University, Tagajo
⁴Department of Physics, University of Tokyo, Tokyo
⁵Budker Institute of Nuclear Physics, Novosibirsk
⁶Swiss Federal Institute of Technology of Lausanne, EPFL, Lausanne
⁷University of Sydney, Sydney NSW
⁸University of Melbourne, Victoria
⁹Institute of High Energy Physics, Protvino
¹⁰J. Stefan Institute, Ljubljana
¹¹H. Niewodniczanski Institute of Nuclear Physics, Krakow
¹²University of Maribor, Maribor
¹³University of Hawaii, Honolulu, Hawaii 96822, USA
¹⁴Department of Physics, Fu Jen Catholic University, Taipei
¹⁵Department of Physics, National Taiwan University, Taipei
¹⁶National Central University, Chung-li
¹⁷Hanyang University, Seoul
¹⁸Sungkyunkwan University, Suwon
¹⁹Virginia Polytechnic Institute and State University, Blacksburg, Virginia 24061, USA
²⁰University of Cincinnati, Cincinnati, Ohio 45221, USA
²¹Princeton University, Princeton, New Jersey 08544, USA
²²University of Ljubljana, Ljubljana
²³Korea University, Seoul
²⁴Nagoya University, Nagoya
²⁵Nara Women’s University, Nara
²⁶Osaka University, Osaka
²⁷Yonsei University, Seoul
²⁸Chiba University, Chiba
²⁹Niigata University, Niigata
³⁰Tokyo Institute of Technology, Tokyo
³¹The Graduate University for Advanced Studies, Hayama, Japan
³²Panjab University, Chandigarh
³³Institute of High Energy Physics, Vienna
³⁴Seoul National University, Seoul
³⁵Tata Institute of Fundamental Research, Bombay
³⁶Tokyo Metropolitan University, Tokyo
³⁷Hiroshima Institute of Technology, Hiroshima
³⁸Tokyo University of Agriculture and Technology, Tokyo
³⁹Toho University, Funabashi
⁴⁰Kanagawa University, Yokohama
⁴¹RIKEN BNL Research Center, Upton, New York 11973, USA
⁴²Kyungpook National University, Taegu
⁴³Shinshu University, Nagano
⁴⁴University of Illinois at Urbana-Champaign, Urbana, Illinois 61801, USA
⁴⁵University of Nova Gorica, Nova Gorica
⁴⁶Osaka City University, Osaka
⁴⁷Peking University, Beijing
⁴⁸National United University, Miao Li
⁴⁹Institute of High Energy Physics, Chinese Academy of Sciences, Beijing
⁵⁰Tohoku University, Sendai
⁵¹Nippon Dental University, Niigata
⁵²University of Science and Technology of China, Hefei

PDF

Phys. Rev. D 76, 051102(R) – Published 12 September, 2007

DOI: https://doi.org/10.1103/PhysRevD.76.051102

Abstract

We report the first observation of the decay ${\bar{B}}^{0} \to D_{s}^{+} Λ \bar{p}$ with a statistical significance of $6.6 σ$ . We measure $B ({\bar{B}}^{0} \to D_{s}^{+} Λ \bar{p}) = (2.9 \pm 0.7 \pm 0.5 \pm 0.4) \times 10^{- 5}$ , where the first error is statistical, the second is systematic, and the third error comes from the uncertainty in $B (D_{s}^{+} \to ϕ π^{+})$ . The data used for this analysis was accumulated at the $Υ (4 S)$ resonance, using the Belle detector at the KEKB asymmetric-energy $e^{+} e^{-}$ collider. The integrated luminosity of the data sample is $414 {fb}^{- 1}$ , corresponding to $449 \times 10^{6}$ $B \bar{B}$ pairs.

Article Text

References (33)

N. Gabyshev et al. (Belle Collaboration), Phys. Rev. Lett. 90, 121802 (2003).
M.-Z. Wang et al. (Belle Collaboration), Phys. Rev. Lett. 90, 201802 (2003).
K. Abe et al. (Belle Collaboration), Phys. Rev. Lett. 88, 181803 (2002).
N. Gabyshev et al. (Belle Collaboration), Phys. Rev. D 66, 091102 (2002).
K. Abe et al. (Belle Collaboration), Phys. Rev. Lett. 89, 151802 (2002).
S. A. Dytman et al. (CLEO Collaboration), Phys. Rev. D 66, 091101 (2002).
S. Anderson et al. (CLEO Collaboration), Phys. Rev. Lett. 86, 2732 (2001).
M.-Z. Wang et al. (Belle Collaboration), Phys. Rev. Lett. 92, 131801 (2004).
K. S. Park et al. (Belle Collaboration), Phys. Rev. D 75, 011101 (2007).
M.-Z. Wang et al. (Belle Collaboration), Belle Report No. 2007-19.
C.-K. Chua, W.-S. Hou, and S.-Y. Tsai, Phys. Rev. D 65, 034003 (2002).
C.-K. Chua, W.-S. Hou, and S.-Y. Tsai, Phys. Lett. B 528, 233 (2002).
J. L. Rosner, Phys. Rev. D 68, 014004 (2003).
B. Kerbikov, A. Stavinsky, and V. Fedotov, Phys. Rev. C 69, 055205 (2004).
J. Haidenbauer, Ulf-G. Meissner, and A. Sibirtsev, Phys. Rev. D 74, 017501 (2006).
D. R. Entem and F. Fernandez, Phys. Rev. D 75, 014004 (2007).
H. Kichimi, Nucl. Phys. B, Proc. Suppl. 142, 197 (2005).
W.-S. Hou and A. Soni, Phys. Rev. Lett. 86, 4247 (2001).
B. Aubert et al. (BABAR Collaboration), Phys. Rev. D 72, 051101 (2005).
M.-Z. Wang et al. (Belle Collaboration), Phys. Lett. B 617, 141 (2005).
S. Kurokawa and E. Kikutani, Nucl. Instrum. Methods Phys. Res., Sect. A 499, 1 (2003), and other papers included in this volume.
A. Abashian et al. (Belle Collaboration), Nucl. Instrum. Methods Phys. Res., Sect. A 479, 117 (2002).
Z. Natkaniec et al. (Belle SVD2 Group), Nucl. Instrum. Methods Phys. Res., Sect. A 560, 1 (2006).
R. Brun et al., GEANT 3.21, CERN Report No. DD/EE/84-1, 1984.
Charged kaons are required to satisfy $L (K) / (L (K) + L (π)) > 0.6$ . Charged pions are required to satisfy $L (π) / (L (K) + L (π)) > 0.1$ . Protons are required to satisfy $L (p) / (L (K) + L (p)) > 0.6$ and $L (p) / (L (π) + L (p)) > 0.6$ . Here $L (K / π / p)$ is the particle identification likelihood for the $K / π / p$ hypotheses. The above requirements have efficiencies of more than 95% for pions, kaons, and protons, respectively, from ${\bar{B}}^{0} \to D_{s}^{+} Λ \bar{p}$ decays. The probability for each particle species to be misidentified as one of the other two is less than 5%.
W.-M. Yao et al. (Particle Data Group), J. Phys. G 33, 1 (2006).
G. C. Fox and S. Wolfram, Phys. Rev. Lett. 41, 1581 (1978).
S. L. Zang et al. (Belle Collaboration), Phys. Rev. D 69, 017101 (2004).
N. Gabyshev et al. (Belle Collaboration), Phys. Rev. Lett. 97, 202003 (2006).
H. Albrecht et al. (ARGUS Collaboration), Phys. Lett. B 241, 278 (1990).
The $B$ -sideband is defined as a region of $M_{bc} > 5.2 GeV / c^{2}$ and $- 0.08 GeV / c^{2} < Δ M < 0.12 GeV / c^{2}$ excluding the $B$ -signal region.
Protons are required to satisfy inverted likelihood ratio requirement $L (p) / (L (K) + L (p)) < 0.6$ .
B. Aubert et al. (BABAR Collaboration), Phys. Rev. D 74, 051101 (2006).

Physical Review D

Export citation

Export citation

Observation of the decay ${\bar{B}}^{0} \to D_{s}^{+} Λ \bar{p}$

Abstract

Article Text

References (33)

Outline

Information

Filter

Filter

Article Lookup

Enter a citation

Observation of the decay B¯0→Ds+Λp¯

Abstract

Article Text

References (33)

Observation of the decay ${\bar{B}}^{0} \to D_{s}^{+} Λ \bar{p}$