Measurements of branching fractions and q2 distributions for B → π ℓ ν and B → ρ ℓ ν decays with B → D(*) ℓ ν decay tagging

T. Hokuue; K. Abe; K. Abe; I. Adachi; H. Aihara; Y. Asano; T. Aushev; A. M. Bakich; V. Balagura; E. Barberio; M. Barbero; A. Bay; I. Bedny; K. Belous; U. Bitenc; I. Bizjak; S. Blyth; A. Bondar; A. Bozek; M. Bračko; T. E. Browder; P. Chang; A. Chen; W. T. Chen; Y. Choi; A. Chuvikov; S. Cole; J. Dalseno; M. Danilov; M. Dash; A. Drutskoy; S. Eidelman; N. Gabyshev; A. Garmash; T. Gershon; G. Gokhroo; A. Gorišek; H. Ha; J. Haba; K. Hara; T. Hara; K. Hayasaka; H. Hayashii; M. Hazumi; L. Hinz; Y. Hoshi; S. Hou; W. S. Hou; T. Iijima; K. Ikado; A. Imoto; K. Inami; A. Ishikawa; R. Itoh; M. Iwasaki; Y. Iwasaki; H. Kakuno; J. H. Kang; P. Kapusta; S. U. Kataoka; H. Kawai; T. Kawasaki; H. R. Khan; H. J. Kim; H. O. Kim; K. Kinoshita; Y. Kozakai; P. Križan; P. Krokovny; R. Kulasiri; R. Kumar; C. C. Kuo; A. Kuzmin; Y. J. Kwon; J. Lee; T. Lesiak; J. Li; A. Limosani; S. W. Lin; G. Majumder; F. Mandl; T. Matsumoto; A. Matyja; S. McOnie; W. Mitaroff; H. Miyake; H. Miyata; Y. Miyazaki; D. Mohapatra; I. Nakamura; E. Nakano; Z. Natkaniec; S. Nishida; O. Nitoh; T. Nozaki; S. Ogawa; T. Ohshima; T. Okabe; S. Okuno; S. L. Olsen; Y. Onuki; P. Pakhlov; C. W. Park; H. Park; L. S. Peak; R. Pestotnik; L. E. Piilonen; Y. Sakai; N. Sato; N. Satoyama; K. Sayeed; T. Schietinger; O. Schneider; C. Schwanda; A. J. Schwartz; K. Senyo; M. E. Sevior; M. Shapkin; H. Shibuya; B. Shwartz; A. Somov; R. Stamen; S. Stanič; M. Starič; H. Stoeck; A. Sugiyama; S. Suzuki; S. Y. Suzuki; O. Tajima; F. Takasaki; K. Tamai; M. Tanaka; G. N. Taylor; Y. Teramoto; X. C. Tian; T. Tsukamoto; K. Ueno; T. Uglov; Y. Unno; S. Uno; P. Urquijo; Y. Usov; G. Varner; K. E. Varvell; S. Villa; C. C. Wang; C. H. Wang; M. Z. Wang; Y. Watanabe; E. Won; A. Yamaguchi; Y. Yamashita; M. Yamauchi; J. Ying; L. M. Zhang; Z. P. Zhang; D. Zürcher

doi:10.1016/j.physletb.2007.02.067

Measurements of branching fractions and q² distributions for B → π ℓ ν and B → ρ ℓ ν decays with B → D^(*) ℓ ν decay tagging

T. Hokuue, K. Abe, K. Abe, I. Adachi, H. Aihara, Y. Asano, T. Aushev, A. M. Bakich, V. Balagura, E. Barberio, M. Barbero, A. Bay, I. Bedny, K. Belous, U. Bitenc, I. Bizjak, S. Blyth, A. Bondar, A. Bozek, M. BračkoT. E. Browder, P. Chang, A. Chen, W. T. Chen, Y. Choi, A. Chuvikov, S. Cole, J. Dalseno, M. Danilov, M. Dash, A. Drutskoy, S. Eidelman, N. Gabyshev, A. Garmash, T. Gershon, G. Gokhroo, A. Gorišek, H. Ha, J. Haba, K. Hara, T. Hara, K. Hayasaka, H. Hayashii, M. Hazumi, L. Hinz, Y. Hoshi, S. Hou, W. S. Hou, T. Iijima, K. Ikado, A. Imoto, K. Inami, A. Ishikawa, R. Itoh, M. Iwasaki, Y. Iwasaki, H. Kakuno, J. H. Kang, P. Kapusta, S. U. Kataoka, H. Kawai, T. Kawasaki, H. R. Khan, H. J. Kim, H. O. Kim, K. Kinoshita, Y. Kozakai, P. Križan, P. Krokovny, R. Kulasiri, R. Kumar, C. C. Kuo, A. Kuzmin, Y. J. Kwon, J. Lee, T. Lesiak, J. Li, A. Limosani, S. W. Lin, G. Majumder, F. Mandl, T. Matsumoto, A. Matyja, S. McOnie, W. Mitaroff, H. Miyake, H. Miyata, Y. Miyazaki, D. Mohapatra, I. Nakamura, E. Nakano, Z. Natkaniec, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, T. Ohshima, T. Okabe, S. Okuno, S. L. Olsen, Y. Onuki, P. Pakhlov, C. W. Park, H. Park, L. S. Peak, R. Pestotnik, L. E. Piilonen, Y. Sakai, N. Sato, N. Satoyama, K. Sayeed, T. Schietinger, O. Schneider, C. Schwanda, A. J. Schwartz, K. Senyo, M. E. Sevior, M. Shapkin, H. Shibuya, B. Shwartz, A. Somov, R. Stamen, S. Stanič, M. Starič, H. Stoeck, A. Sugiyama, S. Suzuki, S. Y. Suzuki, O. Tajima, F. Takasaki, K. Tamai, M. Tanaka, G. N. Taylor, Y. Teramoto, X. C. Tian, T. Tsukamoto, K. Ueno, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Usov, G. Varner, K. E. Varvell, S. Villa, C. C. Wang, C. H. Wang, M. Z. Wang, Y. Watanabe, E. Won, A. Yamaguchi, Y. Yamashita, M. Yamauchi, J. Ying, L. M. Zhang, Z. P. Zhang, D. Zürcher

Department of Physics

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

63 Citations (Scopus)

Abstract

We report measurements of the charmless semileptonic decays B⁰ → π^- / ρ^- ℓ⁺ ν and B⁺ → π⁰ / ρ⁰ ℓ⁺ ν, based on a sample of 2.75 × 10⁸B over(B, ̄) events collected at the Υ{hooked} (4 S) resonance with the Belle detector at the KEKB e⁺ e^- asymmetric collider. In this analysis, the accompanying B meson is reconstructed in the semileptonic mode B → D^(*) ℓ ν, enabling detection of the signal modes with high purity. We measure the branching fractions B (B⁰ → π^- ℓ⁺ ν) = (1.38 ± 0.19 ± 0.14 ± 0.03) × 10^-4, B (B⁰ → ρ^- ℓ⁺ ν) = (2.17 ± 0.54 ± 0.31 ± 0.08) × 10^-4, B (B⁺ → π⁰ ℓ⁺ ν) = (0.77 ± 0.14 ± 0.08 ± 0.00) × 10^-4 and B (B⁺ → ρ⁰ ℓ⁺ ν) = (1.33 ± 0.23 ± 0.17 ± 0.05) × 10^-4, where the errors are statistical, experimental systematic, and systematic due to form factor uncertainties, respectively. For each mode we also present the partial branching fractions in three q² intervals: q² < 8, 8 ≤ q² < 16, and q² ≥ 16 GeV² / c². From our partial branching fractions for B → π ℓ ν and recent results for the form factor from unquenched Lattice QCD calculations, we obtain values of the CKM matrix element | V_{u b} |.

Original language	English
Pages (from-to)	139-148
Number of pages	10
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	648
Issue number	2-3
DOIs	https://doi.org/10.1016/j.physletb.2007.02.067
Publication status	Published - 2007 May 3

Bibliographical note

Funding Information:
We thank the KEKB group for the excellent operation of the accelerator, the KEK cryogenics group for the efficient operation of the solenoid, and the KEK computer group and the National Institute of Informatics for valuable computing and Super-SINET network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology of Japan and the Japan Society for the Promotion of Science; the Australian Research Council and the Australian Department of Education, Science and Training; the National Science Foundation of China and the Knowledge Innovation Program of Chinese Academy of Sciences under contract No. 10575109 and IHEP-U-503; the Department of Science and Technology of India; the BK21 program of the Ministry of Education of Korea, and the CHEP SRC program and Basic Research program (grant No. R01-2005-000-10089-0) of the Korea Science and Engineering Foundation; the Polish State Committee for Scientific Research under contract No. 2P03B 01324; the Ministry of Science and Technology of the Russian Federation; the Slovenian Research Agency; the Swiss National Science Foundation; the National Science Council and the Ministry of Education of Taiwan; and the US Department of Energy.

Keywords

B decay
Exclusive
Semileptonic

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/j.physletb.2007.02.067

Cite this

Hokuue, T., Abe, K., Abe, K., Adachi, I., Aihara, H., Asano, Y., Aushev, T., Bakich, A. M., Balagura, V., Barberio, E., Barbero, M., Bay, A., Bedny, I., Belous, K., Bitenc, U., Bizjak, I., Blyth, S., Bondar, A., Bozek, A., ... Zürcher, D. (2007). Measurements of branching fractions and q² distributions for B → π ℓ ν and B → ρ ℓ ν decays with B → D^(*) ℓ ν decay tagging. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 648(2-3), 139-148. https://doi.org/10.1016/j.physletb.2007.02.067

Measurements of branching fractions and q² distributions for B → π ℓ ν and B → ρ ℓ ν decays with B → D^(*) ℓ ν decay tagging. / Hokuue, T.; Abe, K.; Abe, K. et al.
In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 648, No. 2-3, 03.05.2007, p. 139-148.

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

Hokuue, T, Abe, K, Abe, K, Adachi, I, Aihara, H, Asano, Y, Aushev, T, Bakich, AM, Balagura, V, Barberio, E, Barbero, M, Bay, A, Bedny, I, Belous, K, Bitenc, U, Bizjak, I, Blyth, S, Bondar, A, Bozek, A, Bračko, M, Browder, TE, Chang, P, Chen, A, Chen, WT, Choi, Y, Chuvikov, A, Cole, S, Dalseno, J, Danilov, M, Dash, M, Drutskoy, A, Eidelman, S, Gabyshev, N, Garmash, A, Gershon, T, Gokhroo, G, Gorišek, A, Ha, H, Haba, J, Hara, K, Hara, T, Hayasaka, K, Hayashii, H, Hazumi, M, Hinz, L, Hoshi, Y, Hou, S, Hou, WS, Iijima, T, Ikado, K, Imoto, A, Inami, K, Ishikawa, A, Itoh, R, Iwasaki, M, Iwasaki, Y, Kakuno, H, Kang, JH, Kapusta, P, Kataoka, SU, Kawai, H, Kawasaki, T, Khan, HR, Kim, HJ, Kim, HO, Kinoshita, K, Kozakai, Y, Križan, P, Krokovny, P, Kulasiri, R, Kumar, R, Kuo, CC, Kuzmin, A, Kwon, YJ, Lee, J, Lesiak, T, Li, J, Limosani, A, Lin, SW, Majumder, G, Mandl, F, Matsumoto, T, Matyja, A, McOnie, S, Mitaroff, W, Miyake, H, Miyata, H, Miyazaki, Y, Mohapatra, D, Nakamura, I, Nakano, E, Natkaniec, Z, Nishida, S, Nitoh, O, Nozaki, T, Ogawa, S, Ohshima, T, Okabe, T, Okuno, S, Olsen, SL, Onuki, Y, Pakhlov, P, Park, CW, Park, H, Peak, LS, Pestotnik, R, Piilonen, LE, Sakai, Y, Sato, N, Satoyama, N, Sayeed, K, Schietinger, T, Schneider, O, Schwanda, C, Schwartz, AJ, Senyo, K, Sevior, ME, Shapkin, M, Shibuya, H, Shwartz, B, Somov, A, Stamen, R, Stanič, S, Starič, M, Stoeck, H, Sugiyama, A, Suzuki, S, Suzuki, SY, Tajima, O, Takasaki, F, Tamai, K, Tanaka, M, Taylor, GN, Teramoto, Y, Tian, XC, Tsukamoto, T, Ueno, K, Uglov, T, Unno, Y, Uno, S, Urquijo, P, Usov, Y, Varner, G, Varvell, KE, Villa, S, Wang, CC, Wang, CH, Wang, MZ, Watanabe, Y, Won, E, Yamaguchi, A, Yamashita, Y, Yamauchi, M, Ying, J, Zhang, LM, Zhang, ZP & Zürcher, D 2007, 'Measurements of branching fractions and q² distributions for B → π ℓ ν and B → ρ ℓ ν decays with B → D^(*) ℓ ν decay tagging', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 648, no. 2-3, pp. 139-148. https://doi.org/10.1016/j.physletb.2007.02.067

@article{c0b60bbd0eeb4dd792c535c8123ac854,

title = "Measurements of branching fractions and q2 distributions for B → π ℓ ν and B → ρ ℓ ν decays with B → D(*) ℓ ν decay tagging",

abstract = "We report measurements of the charmless semileptonic decays B0 → π- / ρ- ℓ+ ν and B+ → π0 / ρ0 ℓ+ ν, based on a sample of 2.75 × 108B over(B,{\= }) events collected at the Υ{hooked} (4 S) resonance with the Belle detector at the KEKB e+ e- asymmetric collider. In this analysis, the accompanying B meson is reconstructed in the semileptonic mode B → D(*) ℓ ν, enabling detection of the signal modes with high purity. We measure the branching fractions B (B0 → π- ℓ+ ν) = (1.38 ± 0.19 ± 0.14 ± 0.03) × 10-4, B (B0 → ρ- ℓ+ ν) = (2.17 ± 0.54 ± 0.31 ± 0.08) × 10-4, B (B+ → π0 ℓ+ ν) = (0.77 ± 0.14 ± 0.08 ± 0.00) × 10-4 and B (B+ → ρ0 ℓ+ ν) = (1.33 ± 0.23 ± 0.17 ± 0.05) × 10-4, where the errors are statistical, experimental systematic, and systematic due to form factor uncertainties, respectively. For each mode we also present the partial branching fractions in three q2 intervals: q2 < 8, 8 ≤ q2 < 16, and q2 ≥ 16 GeV2 / c2. From our partial branching fractions for B → π ℓ ν and recent results for the form factor from unquenched Lattice QCD calculations, we obtain values of the CKM matrix element | Vu b |.",

keywords = "B decay, Exclusive, Semileptonic",

author = "T. Hokuue and K. Abe and K. Abe and I. Adachi and H. Aihara and Y. Asano and T. Aushev and Bakich, {A. M.} and V. Balagura and E. Barberio and M. Barbero and A. Bay and I. Bedny and K. Belous and U. Bitenc and I. Bizjak and S. Blyth and A. Bondar and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and P. Chang and A. Chen and Chen, {W. T.} and Y. Choi and A. Chuvikov and S. Cole and J. Dalseno and M. Danilov and M. Dash and A. Drutskoy and S. Eidelman and N. Gabyshev and A. Garmash and T. Gershon and G. Gokhroo and A. Gori{\v s}ek and H. Ha and J. Haba and K. Hara and T. Hara and K. Hayasaka and H. Hayashii and M. Hazumi and L. Hinz and Y. Hoshi and S. Hou and Hou, {W. S.} and T. Iijima and K. Ikado and A. Imoto and K. Inami and A. Ishikawa and R. Itoh and M. Iwasaki and Y. Iwasaki and H. Kakuno and Kang, {J. H.} and P. Kapusta and Kataoka, {S. U.} and H. Kawai and T. Kawasaki and Khan, {H. R.} and Kim, {H. J.} and Kim, {H. O.} and K. Kinoshita and Y. Kozakai and P. Kri{\v z}an and P. Krokovny and R. Kulasiri and R. Kumar and Kuo, {C. C.} and A. Kuzmin and Kwon, {Y. J.} and J. Lee and T. Lesiak and J. Li and A. Limosani and Lin, {S. W.} and G. Majumder and F. Mandl and T. Matsumoto and A. Matyja and S. McOnie and W. Mitaroff and H. Miyake and H. Miyata and Y. Miyazaki and D. Mohapatra and I. Nakamura and E. Nakano and Z. Natkaniec and S. Nishida and O. Nitoh and T. Nozaki and S. Ogawa and T. Ohshima and T. Okabe and S. Okuno and Olsen, {S. L.} and Y. Onuki and P. Pakhlov and Park, {C. W.} and H. Park and Peak, {L. S.} and R. Pestotnik and Piilonen, {L. E.} and Y. Sakai and N. Sato and N. Satoyama and K. Sayeed and T. Schietinger and O. Schneider and C. Schwanda and Schwartz, {A. J.} and K. Senyo and Sevior, {M. E.} and M. Shapkin and H. Shibuya and B. Shwartz and A. Somov and R. Stamen and S. Stani{\v c} and M. Stari{\v c} and H. Stoeck and A. Sugiyama and S. Suzuki and Suzuki, {S. Y.} and O. Tajima and F. Takasaki and K. Tamai and M. Tanaka and Taylor, {G. N.} and Y. Teramoto and Tian, {X. C.} and T. Tsukamoto and K. Ueno and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Usov and G. Varner and Varvell, {K. E.} and S. Villa and Wang, {C. C.} and Wang, {C. H.} and Wang, {M. Z.} and Y. Watanabe and E. Won and A. Yamaguchi and Y. Yamashita and M. Yamauchi and J. Ying and Zhang, {L. M.} and Zhang, {Z. P.} and D. Z{\"u}rcher",

note = "Funding Information: We thank the KEKB group for the excellent operation of the accelerator, the KEK cryogenics group for the efficient operation of the solenoid, and the KEK computer group and the National Institute of Informatics for valuable computing and Super-SINET network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology of Japan and the Japan Society for the Promotion of Science; the Australian Research Council and the Australian Department of Education, Science and Training; the National Science Foundation of China and the Knowledge Innovation Program of Chinese Academy of Sciences under contract No. 10575109 and IHEP-U-503; the Department of Science and Technology of India; the BK21 program of the Ministry of Education of Korea, and the CHEP SRC program and Basic Research program (grant No. R01-2005-000-10089-0) of the Korea Science and Engineering Foundation; the Polish State Committee for Scientific Research under contract No. 2P03B 01324; the Ministry of Science and Technology of the Russian Federation; the Slovenian Research Agency; the Swiss National Science Foundation; the National Science Council and the Ministry of Education of Taiwan; and the US Department of Energy.",

year = "2007",

month = may,

day = "3",

doi = "10.1016/j.physletb.2007.02.067",

language = "English",

volume = "648",

pages = "139--148",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "2-3",

}

TY - JOUR

T1 - Measurements of branching fractions and q2 distributions for B → π ℓ ν and B → ρ ℓ ν decays with B → D(*) ℓ ν decay tagging

AU - Hokuue, T.

AU - Abe, K.

AU - Adachi, I.

AU - Aihara, H.

AU - Asano, Y.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Balagura, V.

AU - Barberio, E.

AU - Barbero, M.

AU - Bay, A.

AU - Bedny, I.

AU - Belous, K.

AU - Bitenc, U.

AU - Bizjak, I.

AU - Blyth, S.

AU - Bondar, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chang, P.

AU - Chen, A.

AU - Chen, W. T.

AU - Choi, Y.

AU - Chuvikov, A.

AU - Cole, S.

AU - Dalseno, J.

AU - Danilov, M.

AU - Dash, M.

AU - Drutskoy, A.

AU - Eidelman, S.

AU - Gabyshev, N.

AU - Garmash, A.

AU - Gershon, T.

AU - Gokhroo, G.

AU - Gorišek, A.

AU - Ha, H.

AU - Haba, J.

AU - Hara, K.

AU - Hara, T.

AU - Hayasaka, K.

AU - Hayashii, H.

AU - Hazumi, M.

AU - Hinz, L.

AU - Hoshi, Y.

AU - Hou, S.

AU - Hou, W. S.

AU - Iijima, T.

AU - Ikado, K.

AU - Imoto, A.

AU - Inami, K.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, M.

AU - Iwasaki, Y.

AU - Kakuno, H.

AU - Kang, J. H.

AU - Kapusta, P.

AU - Kataoka, S. U.

AU - Kawai, H.

AU - Kawasaki, T.

AU - Khan, H. R.

AU - Kim, H. J.

AU - Kim, H. O.

AU - Kinoshita, K.

AU - Kozakai, Y.

AU - Križan, P.

AU - Krokovny, P.

AU - Kulasiri, R.

AU - Kumar, R.

AU - Kuo, C. C.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lee, J.

AU - Lesiak, T.

AU - Li, J.

AU - Limosani, A.

AU - Lin, S. W.

AU - Majumder, G.

AU - Mandl, F.

AU - Matsumoto, T.

AU - Matyja, A.

AU - McOnie, S.

AU - Mitaroff, W.

AU - Miyake, H.

AU - Miyata, H.

AU - Miyazaki, Y.

AU - Mohapatra, D.

AU - Nakamura, I.

AU - Nakano, E.

AU - Natkaniec, Z.

AU - Nishida, S.

AU - Nitoh, O.

AU - Nozaki, T.

AU - Ogawa, S.

AU - Ohshima, T.

AU - Okabe, T.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Onuki, Y.

AU - Pakhlov, P.

AU - Park, C. W.

AU - Park, H.

AU - Peak, L. S.

AU - Pestotnik, R.

AU - Piilonen, L. E.

AU - Sakai, Y.

AU - Sato, N.

AU - Satoyama, N.

AU - Sayeed, K.

AU - Schietinger, T.

AU - Schneider, O.

AU - Schwanda, C.

AU - Schwartz, A. J.

AU - Senyo, K.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shibuya, H.

AU - Shwartz, B.

AU - Somov, A.

AU - Stamen, R.

AU - Stanič, S.

AU - Starič, M.

AU - Stoeck, H.

AU - Sugiyama, A.

AU - Suzuki, S.

AU - Suzuki, S. Y.

AU - Tajima, O.

AU - Takasaki, F.

AU - Tamai, K.

AU - Tanaka, M.

AU - Taylor, G. N.

AU - Teramoto, Y.

AU - Tian, X. C.

AU - Tsukamoto, T.

AU - Ueno, K.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Usov, Y.

AU - Varner, G.

AU - Varvell, K. E.

AU - Villa, S.

AU - Wang, C. C.

AU - Wang, C. H.

AU - Wang, M. Z.

AU - Watanabe, Y.

AU - Won, E.

AU - Yamaguchi, A.

AU - Yamashita, Y.

AU - Yamauchi, M.

AU - Ying, J.

AU - Zhang, L. M.

AU - Zhang, Z. P.

AU - Zürcher, D.

N1 - Funding Information: We thank the KEKB group for the excellent operation of the accelerator, the KEK cryogenics group for the efficient operation of the solenoid, and the KEK computer group and the National Institute of Informatics for valuable computing and Super-SINET network support. We acknowledge support from the Ministry of Education, Culture, Sports, Science, and Technology of Japan and the Japan Society for the Promotion of Science; the Australian Research Council and the Australian Department of Education, Science and Training; the National Science Foundation of China and the Knowledge Innovation Program of Chinese Academy of Sciences under contract No. 10575109 and IHEP-U-503; the Department of Science and Technology of India; the BK21 program of the Ministry of Education of Korea, and the CHEP SRC program and Basic Research program (grant No. R01-2005-000-10089-0) of the Korea Science and Engineering Foundation; the Polish State Committee for Scientific Research under contract No. 2P03B 01324; the Ministry of Science and Technology of the Russian Federation; the Slovenian Research Agency; the Swiss National Science Foundation; the National Science Council and the Ministry of Education of Taiwan; and the US Department of Energy.

PY - 2007/5/3

Y1 - 2007/5/3

N2 - We report measurements of the charmless semileptonic decays B0 → π- / ρ- ℓ+ ν and B+ → π0 / ρ0 ℓ+ ν, based on a sample of 2.75 × 108B over(B, ̄) events collected at the Υ{hooked} (4 S) resonance with the Belle detector at the KEKB e+ e- asymmetric collider. In this analysis, the accompanying B meson is reconstructed in the semileptonic mode B → D(*) ℓ ν, enabling detection of the signal modes with high purity. We measure the branching fractions B (B0 → π- ℓ+ ν) = (1.38 ± 0.19 ± 0.14 ± 0.03) × 10-4, B (B0 → ρ- ℓ+ ν) = (2.17 ± 0.54 ± 0.31 ± 0.08) × 10-4, B (B+ → π0 ℓ+ ν) = (0.77 ± 0.14 ± 0.08 ± 0.00) × 10-4 and B (B+ → ρ0 ℓ+ ν) = (1.33 ± 0.23 ± 0.17 ± 0.05) × 10-4, where the errors are statistical, experimental systematic, and systematic due to form factor uncertainties, respectively. For each mode we also present the partial branching fractions in three q2 intervals: q2 < 8, 8 ≤ q2 < 16, and q2 ≥ 16 GeV2 / c2. From our partial branching fractions for B → π ℓ ν and recent results for the form factor from unquenched Lattice QCD calculations, we obtain values of the CKM matrix element | Vu b |.

AB - We report measurements of the charmless semileptonic decays B0 → π- / ρ- ℓ+ ν and B+ → π0 / ρ0 ℓ+ ν, based on a sample of 2.75 × 108B over(B, ̄) events collected at the Υ{hooked} (4 S) resonance with the Belle detector at the KEKB e+ e- asymmetric collider. In this analysis, the accompanying B meson is reconstructed in the semileptonic mode B → D(*) ℓ ν, enabling detection of the signal modes with high purity. We measure the branching fractions B (B0 → π- ℓ+ ν) = (1.38 ± 0.19 ± 0.14 ± 0.03) × 10-4, B (B0 → ρ- ℓ+ ν) = (2.17 ± 0.54 ± 0.31 ± 0.08) × 10-4, B (B+ → π0 ℓ+ ν) = (0.77 ± 0.14 ± 0.08 ± 0.00) × 10-4 and B (B+ → ρ0 ℓ+ ν) = (1.33 ± 0.23 ± 0.17 ± 0.05) × 10-4, where the errors are statistical, experimental systematic, and systematic due to form factor uncertainties, respectively. For each mode we also present the partial branching fractions in three q2 intervals: q2 < 8, 8 ≤ q2 < 16, and q2 ≥ 16 GeV2 / c2. From our partial branching fractions for B → π ℓ ν and recent results for the form factor from unquenched Lattice QCD calculations, we obtain values of the CKM matrix element | Vu b |.

KW - B decay

KW - Exclusive

KW - Semileptonic

UR - http://www.scopus.com/inward/record.url?scp=34147138984&partnerID=8YFLogxK

U2 - 10.1016/j.physletb.2007.02.067

DO - 10.1016/j.physletb.2007.02.067

M3 - Article

AN - SCOPUS:34147138984

SN - 0370-2693

VL - 648

SP - 139

EP - 148

JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

IS - 2-3

ER -