Evidence for B -→Ds+K -ℓ -ν ̄ℓ and search for B -→Ds*+K -ℓ -ν ̄ℓ

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

doi:10.1103/PhysRevD.86.072007

Evidence for B ^-→Ds+K ^-ℓ ^-ν _̄ℓ and search for B ^-→Ds*+K ^-ℓ ^-ν _̄ℓ

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

Department of Physics

Research output: Contribution to journal › Article › peer-review

5 Citations (Scopus)

Abstract

We report measurements of the decays B ^-→Ds(*)+K ^-ℓ ^-ν _̄ℓ in a data sample containing 657×106BB̄ 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 D _s and Ds* modes and find the first evidence of the B ^-→Ds+K ^-ℓ ^-ν _̄ℓ decay with a significance of 3.4σ. We measure the following branching fractions: B(B ^-→Ds+K ^-ℓ ^-ν _̄ℓ)=(0.30±0.09(stat)-0.08+0.11(syst)) ×10 ^-3 and B(B ^-→Ds(*)+K ^-ℓ ^-ν _̄ℓ)=(0.59±0.12(stat) ±0.15(syst))×10 ^-3 and set an upper limit B(B ^-→Ds*+K ^-ℓ ^-ν _̄ℓ)<0.56×10 ^-3 at the 90% confidence level. We also present the first measurement of the Ds+K ^- invariant mass distribution in these decays, which is dominated by a prominent peak around 2.6GeV/c2.

Original language	English
Article number	072007
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	86
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.86.072007
Publication status	Published - 2012 Oct 23

Bibliographical note

Funding Information:
The author wishes to thank Cynthia Garcia, Grace Kuo. and, especially. Jeff Griffith. for assistance with the bibliography. Kathy Brill and Sandy Ellithorpe provided invaluable secretarial assistance. The author was supported by grants from the Muscular Dystrophy Association and the National Institutes of Health (NS 19525) and an N.S.F. Presidential Young Investigator Award during the course of this work.

All Science Journal Classification (ASJC) codes

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

Access to Document

10.1103/PhysRevD.86.072007

Cite this

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., ... Zupanc, A. (2012). Evidence for B ^-→Ds+K ^-ℓ ^-ν _̄ℓ and search for B ^-→Ds*+K ^-ℓ ^-ν _̄ℓ Physical Review D - Particles, Fields, Gravitation and Cosmology, 86(7), [072007]. https://doi.org/10.1103/PhysRevD.86.072007

@article{435b2da11f6f4cad9abcde908ea8b00a,

title = "Evidence for B -→Ds+K -ℓ -ν{\= }ℓ and search for B -→Ds*+K -ℓ -ν{\= }ℓ ",

abstract = "We report measurements of the decays B -→Ds(*)+K -ℓ -ν{\= }ℓ in a data sample containing 657×106B{\=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 D s and Ds* modes and find the first evidence of the B -→Ds+K -ℓ -ν{\= }ℓ decay with a significance of 3.4σ. We measure the following branching fractions: B(B -→Ds+K -ℓ -ν{\= }ℓ)=(0.30±0.09(stat)-0.08+0.11(syst)) ×10 -3 and B(B -→Ds(*)+K -ℓ -ν{\= }ℓ)=(0.59±0.12(stat) ±0.15(syst))×10 -3 and set an upper limit B(B -→Ds*+K -ℓ -ν{\= }ℓ)<0.56×10 -3 at the 90% confidence level. We also present the first measurement of the Ds+K - invariant mass distribution in these decays, which is dominated by a prominent peak around 2.6GeV/c2.",

author = "J. Stypula and M. Rozanska and I. Adachi and K. Adamczyk and H. Aihara and Asner, {D. M.} and T. Aushev and Bakich, {A. M.} and V. Bhardwaj and B. Bhuyan and M. Bischofberger and A. Bondar and G. Bonvicini and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and Chang, {M. C.} and P. Chang and V. Chekelian and A. Chen and P. Chen and Cheon, {B. G.} and R. Chistov and Cho, {I. S.} and K. Cho and Y. Choi and J. Dalseno and M. Danilov and J. Dingfelder and Z. Doleal and Z. Dr{\'a}sal and A. Drutskoy and S. Eidelman and H. Farhat and Fast, {J. E.} and V. Gaur and N. Gabyshev and R. Gillard and Goh, {Y. M.} and B. Golob and J. Haba and K. Hayasaka and H. Hayashii and Y. Horii and Y. Hoshi and Hou, {W. S.} and Hsiung, {Y. B.} and Hyun, {H. J.} and T. Iijima and K. Inami and A. Ishikawa and R. Itoh and M. Iwabuchi and Y. Iwasaki and T. Julius and Kang, {J. H.} and P. Kapusta and T. Kawasaki and H. Kichimi and C. Kiesling and Kim, {H. J.} and Kim, {J. B.} and Kim, {J. H.} and Kim, {K. T.} and Kim, {Y. J.} and K. Kinoshita and Ko, {B. R.} and P. Kody and S. Korpar and Kouzes, {R. T.} and P. Krian and P. Krokovny and T. Kuhr and T. Kumita and A. Kuzmin and Kwon, {Y. J.} and Lee, {S. H.} and J. Li and Y. Li and J. Libby and C. Liu and Y. Liu and Liu, {Z. Q.} and D. Liventsev and R. Louvot and K. Miyabayashi and H. Miyata and Y. Miyazaki and R. Mizuk and Mohanty, {G. B.} and A. Moll and N. Muramatsu and E. Nakano and M. Nakao and Z. Natkaniec and C. Ng and S. Nishida and K. Nishimura and O. Nitoh and T. Nozaki and S. Ogawa and T. Ohshima and S. Okuno and Olsen, {S. L.} and Y. Onuki and P. Pakhlov and G. Pakhlova and Park, {C. W.} and H. Park and Park, {H. K.} and Pedlar, {T. K.} and R. Pestotnik and M. Petri{\v c} and Piilonen, {L. E.} and M. Ritter and M. R{\"o}hrken and S. Ryu and H. Sahoo and Y. Sakai and S. Sandilya and D. Santel and T. Sanuki and Y. Sato and O. Schneider and C. Schwanda and K. Senyo and O. Seon and Sevior, {M. E.} and M. Shapkin and Shen, {C. P.} and Shibata, {T. A.} and Shiu, {J. G.} and B. Shwartz and A. Sibidanov and F. Simon and P. Smerkol and Sohn, {Y. S.} and A. Sokolov and E. Solovieva and S. Stani{\v c} and M. Stari{\v c} and M. Sumihama and T. Sumiyoshi and Y. Teramoto and M. Uchida and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Usov and P. Vanhoefer and G. Varner and Varvell, {K. E.} and V. Vorobyev and P. Wang and Wang, {X. L.} and M. Watanabe and Y. Watanabe and J. Wiechczynski and Williams, {K. M.} and E. Won and Yabsley, {B. D.} and H. Yamamoto and Y. Yamashita and Zhang, {Z. P.} and V. Zhilich and V. Zhulanov and A. Zupanc",

note = "Funding Information: The author wishes to thank Cynthia Garcia, Grace Kuo. and, especially. Jeff Griffith. for assistance with the bibliography. Kathy Brill and Sandy Ellithorpe provided invaluable secretarial assistance. The author was supported by grants from the Muscular Dystrophy Association and the National Institutes of Health (NS 19525) and an N.S.F. Presidential Young Investigator Award during the course of this work.",

year = "2012",

month = oct,

day = "23",

doi = "10.1103/PhysRevD.86.072007",

language = "English",

volume = "86",

journal = "Physical Review D - Particles, Fields, Gravitation and Cosmology",

issn = "1550-7998",

number = "7",

}

Stypula, J, Rozanska, M, Adachi, I, Adamczyk, K, Aihara, H, Asner, DM, Aushev, T, Bakich, AM, Bhardwaj, V, Bhuyan, B, Bischofberger, M, Bondar, A, Bonvicini, G, Bozek, A, Bračko, M, Browder, TE, Chang, MC, Chang, P, Chekelian, V, Chen, A, Chen, P, Cheon, BG, Chistov, R, Cho, IS, Cho, K, Choi, Y, Dalseno, J, Danilov, M, Dingfelder, J, Doleal, Z, Drásal, Z, Drutskoy, A, Eidelman, S, Farhat, H, Fast, JE, Gaur, V, Gabyshev, N, Gillard, R, Goh, YM, Golob, B, Haba, J, Hayasaka, K, Hayashii, H, Horii, Y, Hoshi, Y, Hou, WS, Hsiung, YB, Hyun, HJ, Iijima, T, Inami, K, Ishikawa, A, Itoh, R, Iwabuchi, M, Iwasaki, Y, Julius, T, Kang, JH, Kapusta, P, Kawasaki, T, Kichimi, H, Kiesling, C, Kim, HJ, Kim, JB, Kim, JH, Kim, KT, Kim, YJ, Kinoshita, K, Ko, BR, Kody, P, Korpar, S, Kouzes, RT, Krian, P, Krokovny, P, Kuhr, T, Kumita, T, Kuzmin, A, Kwon, YJ, Lee, SH, Li, J, Li, Y, Libby, J, Liu, C, Liu, Y, Liu, ZQ, Liventsev, D, Louvot, R, Miyabayashi, K, Miyata, H, Miyazaki, Y, Mizuk, R, Mohanty, GB, 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, SL, Onuki, Y, Pakhlov, P, Pakhlova, G, Park, CW, Park, H, Park, HK, Pedlar, TK, Pestotnik, R, Petrič, M, Piilonen, LE, 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, ME, Shapkin, M, Shen, CP, Shibata, TA, Shiu, JG, Shwartz, B, Sibidanov, A, Simon, F, Smerkol, P, Sohn, YS, 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, KE, Vorobyev, V, Wang, P, Wang, XL, Watanabe, M, Watanabe, Y, Wiechczynski, J, Williams, KM, Won, E, Yabsley, BD, Yamamoto, H, Yamashita, Y, Zhang, ZP, Zhilich, V, Zhulanov, V & Zupanc, A 2012, 'Evidence for B ^-→Ds+K ^-ℓ ^-ν _̄ℓ and search for B ^-→Ds*+K ^-ℓ ^-ν _̄ℓ ', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 86, no. 7, 072007. https://doi.org/10.1103/PhysRevD.86.072007

TY - JOUR

T1 - Evidence for B -→Ds+K -ℓ -ν ̄ℓ and search for B -→Ds*+K -ℓ -ν ̄ℓ

AU - Stypula, J.

AU - Rozanska, M.

AU - Adachi, I.

AU - Adamczyk, K.

AU - Aihara, H.

AU - Asner, D. M.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Bhardwaj, V.

AU - Bhuyan, B.

AU - Bischofberger, M.

AU - Bondar, A.

AU - Bonvicini, G.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chang, M. C.

AU - Chang, P.

AU - Chekelian, V.

AU - Chen, A.

AU - Chen, P.

AU - Cheon, B. G.

AU - Chistov, R.

AU - Cho, I. S.

AU - Cho, K.

AU - Choi, Y.

AU - Dalseno, J.

AU - Danilov, M.

AU - Dingfelder, J.

AU - Doleal, Z.

AU - Drásal, Z.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Farhat, H.

AU - Fast, J. E.

AU - Gaur, V.

AU - Gabyshev, N.

AU - Gillard, R.

AU - Goh, Y. M.

AU - Golob, B.

AU - Haba, J.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Horii, Y.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hsiung, Y. B.

AU - Hyun, H. J.

AU - Iijima, T.

AU - Inami, K.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwabuchi, M.

AU - Iwasaki, Y.

AU - Julius, T.

AU - Kang, J. H.

AU - Kapusta, P.

AU - Kawasaki, T.

AU - Kichimi, H.

AU - Kiesling, C.

AU - Kim, H. J.

AU - Kim, J. B.

AU - Kim, J. H.

AU - Kim, K. T.

AU - Kim, Y. J.

AU - Kinoshita, K.

AU - Ko, B. R.

AU - Kody, P.

AU - Korpar, S.

AU - Kouzes, R. T.

AU - Krian, P.

AU - Krokovny, P.

AU - Kuhr, T.

AU - Kumita, T.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lee, S. H.

AU - Li, J.

AU - Li, Y.

AU - Libby, J.

AU - Liu, C.

AU - Liu, Y.

AU - Liu, Z. Q.

AU - Liventsev, D.

AU - Louvot, R.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mizuk, R.

AU - Mohanty, G. B.

AU - Moll, A.

AU - Muramatsu, N.

AU - Nakano, E.

AU - Nakao, M.

AU - Natkaniec, Z.

AU - Ng, C.

AU - Nishida, S.

AU - Nishimura, K.

AU - Nitoh, O.

AU - Nozaki, T.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Onuki, Y.

AU - Pakhlov, P.

AU - Pakhlova, G.

AU - Park, C. W.

AU - Park, H.

AU - Park, H. K.

AU - Pedlar, T. K.

AU - Pestotnik, R.

AU - Petrič, M.

AU - Piilonen, L. E.

AU - Ritter, M.

AU - Röhrken, M.

AU - Ryu, S.

AU - Sahoo, H.

AU - Sakai, Y.

AU - Sandilya, S.

AU - Santel, D.

AU - Sanuki, T.

AU - Sato, Y.

AU - Schneider, O.

AU - Schwanda, C.

AU - Senyo, K.

AU - Seon, O.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shen, C. P.

AU - Shibata, T. A.

AU - Shiu, J. G.

AU - Shwartz, B.

AU - Sibidanov, A.

AU - Simon, F.

AU - Smerkol, P.

AU - Sohn, Y. S.

AU - Sokolov, A.

AU - Solovieva, E.

AU - Stanič, S.

AU - Starič, M.

AU - Sumihama, M.

AU - Sumiyoshi, T.

AU - Teramoto, Y.

AU - Uchida, M.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Usov, Y.

AU - Vanhoefer, P.

AU - Varner, G.

AU - Varvell, K. E.

AU - Vorobyev, V.

AU - Wang, P.

AU - Wang, X. L.

AU - Watanabe, M.

AU - Watanabe, Y.

AU - Wiechczynski, J.

AU - Williams, K. M.

AU - Won, E.

AU - Yabsley, B. D.

AU - Yamamoto, H.

AU - Yamashita, Y.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhulanov, V.

AU - Zupanc, A.

N1 - Funding Information: The author wishes to thank Cynthia Garcia, Grace Kuo. and, especially. Jeff Griffith. for assistance with the bibliography. Kathy Brill and Sandy Ellithorpe provided invaluable secretarial assistance. The author was supported by grants from the Muscular Dystrophy Association and the National Institutes of Health (NS 19525) and an N.S.F. Presidential Young Investigator Award during the course of this work.

PY - 2012/10/23

Y1 - 2012/10/23

N2 - We report measurements of the decays B -→Ds(*)+K -ℓ -ν ̄ℓ in a data sample containing 657×106BB̄ 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 D s and Ds* modes and find the first evidence of the B -→Ds+K -ℓ -ν ̄ℓ decay with a significance of 3.4σ. We measure the following branching fractions: B(B -→Ds+K -ℓ -ν ̄ℓ)=(0.30±0.09(stat)-0.08+0.11(syst)) ×10 -3 and B(B -→Ds(*)+K -ℓ -ν ̄ℓ)=(0.59±0.12(stat) ±0.15(syst))×10 -3 and set an upper limit B(B -→Ds*+K -ℓ -ν ̄ℓ)<0.56×10 -3 at the 90% confidence level. We also present the first measurement of the Ds+K - invariant mass distribution in these decays, which is dominated by a prominent peak around 2.6GeV/c2.

AB - We report measurements of the decays B -→Ds(*)+K -ℓ -ν ̄ℓ in a data sample containing 657×106BB̄ 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 D s and Ds* modes and find the first evidence of the B -→Ds+K -ℓ -ν ̄ℓ decay with a significance of 3.4σ. We measure the following branching fractions: B(B -→Ds+K -ℓ -ν ̄ℓ)=(0.30±0.09(stat)-0.08+0.11(syst)) ×10 -3 and B(B -→Ds(*)+K -ℓ -ν ̄ℓ)=(0.59±0.12(stat) ±0.15(syst))×10 -3 and set an upper limit B(B -→Ds*+K -ℓ -ν ̄ℓ)<0.56×10 -3 at the 90% confidence level. We also present the first measurement of the Ds+K - invariant mass distribution in these decays, which is dominated by a prominent peak around 2.6GeV/c2.

UR - http://www.scopus.com/inward/record.url?scp=84868029988&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84868029988&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.86.072007

DO - 10.1103/PhysRevD.86.072007

M3 - Article

AN - SCOPUS:84868029988

SN - 1550-7998

VL - 86

JO - Physical Review D - Particles, Fields, Gravitation and Cosmology

JF - Physical Review D - Particles, Fields, Gravitation and Cosmology

IS - 7

M1 - 072007

ER -