Evidence for $B^{-}\to D_s^{+}{K}^{-}{\ell }^{-}{\overline{\nu }}_{\ell }$ and search for $B^{-}\to D_s^{*+}{K}^{-}{\ell }^{-}{\overline{\nu }}_{\ell }$

Journal Article · Mon Oct 01 00:00:00 EDT 2012 · Physical Review. D, Particles, Fields, Gravitation and Cosmology

DOI:https://doi.org/10.1103/PhysRevD.86.072007· OSTI ID:1314426

Stypula, J.; Rozanska, M.; Adachi, I.; Adamczyk, K.; Aihara, H.; Asner, D. M.; Aushev, T.; Bakich, A. M.; Bhardwaj, V.; Bhuyan, B.; Bischofberger, M.; Bondar, A.; Bonvicini, G.; Bozek, A.; Bračko, M.; Browder, T. E.; Chang, M. -C.; Chang, P.; Chekelian, V.; Chen, A. ; Chen, P.; Cheon, B. G.; Chistov, R.; Cho, I. -S.; Cho, K.; Choi, Y.; Dalseno, J.; Danilov, M.; Dingfelder, J.; Doležal, Z.; Drásal, Z.; Drutskoy, A.; Eidelman, S.; Farhat, H.; Fast, J. E.; Gaur, V.; Gabyshev, N.; Gillard, R.; Goh, Y. M.; Golob, B.; Haba, J.; Hayasaka, K.; Hayashii, H.; Horii, Y.; Hoshi, Y.; Hou, W. -S.; Hsiung, Y. B.; Hyun, H. J.; Iijima, T.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwabuchi, M.; Iwasaki, Y.; Julius, T.; Kang, J. H.; Kapusta, P.; Kawasaki, T.; Kichimi, H.; Kiesling, C.; Kim, H. J.; Kim, J. B.; Kim, J. H.; Kim, K. T.; Kim, Y. J.; Kinoshita, K.; Ko, B. R.; Kodyš, P.; Korpar, S.; Kouzes, R. T.; Križan, P.; Krokovny, P.; Kuhr, T.; Kumita, T.; Kuzmin, A.; Kwon, Y. -J.; Lee, S. -H.; Li, J.; Li, Y.; Libby, J.; Liu, C.; Liu, Y.; Liu, Z. Q.; Liventsev, D.; Louvot, R.; Miyabayashi, K.; Miyata, H.; Miyazaki, Y.; Mizuk, R.; Mohanty, G. B.; Moll, A.; Muramatsu, N.; Nakano, E.; Nakao, M.; Natkaniec, Z.; Ng, C.; Nishida, S.; Nishimura, K.; Nitoh, O.; Nozaki, T.; Ogawa, S.; Ohshima, T.; Okuno, S.; Olsen, S. L.; Onuki, Y.; Pakhlov, P.; Pakhlova, G.; Park, C. W.; Park, H.; Park, H. K.; Pedlar, T. K.; Pestotnik, R.; Petrič, M.; Piilonen, L. E.; Ritter, M.; Röhrken, M.; Ryu, S.; Sahoo, H.; Sakai, Y.; Sandilya, S.; Santel, D.; Sanuki, T.; Sato, Y.; Schneider, O.; Schwanda, C.; Senyo, K.; Seon, O.; Sevior, M. E.; Shapkin, M.; Shen, C. P.; Shibata, T. -A.; Shiu, J. -G.; Shwartz, B.; Sibidanov, A.; Simon, F.; Smerkol, P.; Sohn, Y. -S.; Sokolov, A.; Solovieva, E.; Stanič, S.; Starič, M.; Sumihama, M.; Sumiyoshi, T.; Teramoto, Y.; Uchida, M.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Vanhoefer, P.; Varner, G.; Varvell, K. E.; Vorobyev, V.; Wang, P.; Wang, X. L.; Watanabe, M.; Watanabe, Y.; Wiechczynski, J.; Williams, K. M.; Won, E.; Yabsley, B. D.; Yamamoto, H.; Yamashita, Y.; Zhang, Z. P.; Zhilich, V.; Zhulanov, V.; Zupanc, A.

We report measurements of the decays B^-→D$$+\atop{s}$$K^-ℓ^-$$\bar{v}$$_ℓin a data sample containing 657×10⁶B$$\bar{B}$$ pairs collected with the Belle detector at the KEKB asymmetric-energy e⁺e^- collider. We observe a signal with a significance of 6σ for the combined Ds and Ds* modes and find the first evidence of the B^-→D$$+\atop{s}$$K^-ℓ^-v ℓ decay with a significance of 3.4σ. We measure the following branching fractions: B(B^-→Ds^-K^-ℓ^-v ℓ)=(0.30±0.09(stat)$$+0.11\atop{-0.08}$$(syst))×10^-3 and B(B-→D$$*+\atop{s}$$⁺K^-ℓ^-v ℓ)=(0.59±0.12(stat)±0.15(syst))×10^-3 and set an upper limit B(B^-→D$$+*\atop{s}$$⁺K^-ℓ^-v ℓ)<0.56×10^-3 at the 90% confidence level. We also present the first measurement of the D$$+\atop{s}$$K^- invariant mass distribution in these decays, which is dominated by a prominent peak around 2.6 GeV/c².

• Research Organization: Pacific Northwest National Lab. (PNNL), Richland, WA (United States). Environmental Molecular Sciences Lab. (EMSL)
• Sponsoring Organization: USDOE
• Contributing Organization: The Belle Collaboration
• DOE Contract Number: AC05-76RL01830
• OSTI ID: 1314426
• Report Number(s): PNNL-SA-92406; 45392; KA2201020
• Journal Information: Physical Review. D, Particles, Fields, Gravitation and Cosmology, Vol. 86, Issue 7; ISSN 1550-7998
• Publisher: American Physical Society (APS)
• Country of Publication: United States
• Language: English

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Environmental Molecular Sciences Laboratory