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 & 137 others 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

Research output: Contribution to journalArticle

54 Citations (Scopus)

Abstract

We report measurements of the charmless semileptonic decays B0 → π- / ρ-+ ν and B+ → π0 / ρ0+ 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-+ ν) = (1.38 ± 0.19 ± 0.14 ± 0.03) × 10-4, B (B0 → ρ-+ ν) = (2.17 ± 0.54 ± 0.31 ± 0.08) × 10-4, B (B+ → π0+ ν) = (0.77 ± 0.14 ± 0.08 ± 0.00) × 10-4 and B (B+ → ρ0+ 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

Original languageEnglish
Pages (from-to)139-148
Number of pages10
JournalPhysics Letters B
Volume648
Issue number2-3
DOIs
Publication statusPublished - May 3 2007

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marking
form factors
decay
purity
mesons
quantum chromodynamics
intervals
detectors
matrices

Keywords

  • B decay
  • Exclusive
  • Semileptonic

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Cite this

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.; 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.; Bračko, M.; Browder, T. E.; Chang, P.; Chen, A.; Chen, W. T.; 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, W. S.; Iijima, T.; Ikado, K.; Imoto, A.; Inami, K.; Ishikawa, A.; Itoh, R.; Iwasaki, M.; Iwasaki, Y.; Kakuno, H.; Kang, J. H.; Kapusta, P.; Kataoka, S. U.; Kawai, H.; Kawasaki, T.; Khan, H. R.; Kim, H. J.; Kim, H. O.; Kinoshita, K.; Kozakai, Y.; Križan, P.; Krokovny, P.; Kulasiri, R.; Kumar, R.; Kuo, C. C.; Kuzmin, A.; Kwon, Y. J.; Lee, J.; Lesiak, T.; Li, J.; Limosani, A.; Lin, S. W.; 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, S. L.; Onuki, Y.; Pakhlov, P.; Park, C. W.; Park, H.; Peak, L. S.; Pestotnik, R.; Piilonen, L. E.; Sakai, Y.; Sato, N.; Satoyama, N.; Sayeed, K.; Schietinger, T.; Schneider, O.; Schwanda, C.; Schwartz, A. J.; Senyo, K.; Sevior, M. E.; Shapkin, M.; Shibuya, H.; Shwartz, B.; Somov, A.; Stamen, R.; Stanič, S.; Starič, M.; Stoeck, H.; Sugiyama, A.; Suzuki, S.; Suzuki, S. Y.; Tajima, O.; Takasaki, F.; Tamai, K.; Tanaka, M.; Taylor, G. N.; Teramoto, Y.; Tian, X. C.; Tsukamoto, T.; Ueno, K.; Uglov, T.; Unno, Y.; Uno, S.; Urquijo, P.; Usov, Y.; Varner, G.; Varvell, K. E.; Villa, S.; Wang, C. C.; Wang, C. H.; Wang, M. Z.; Watanabe, Y.; Won, E.; Yamaguchi, A.; Yamashita, Y.; Yamauchi, M.; Ying, J.; Zhang, L. M.; Zhang, Z. P.; Zürcher, D.

In: Physics Letters B, Vol. 648, No. 2-3, 03.05.2007, p. 139-148.

Research output: Contribution to journalArticle

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 B, vol. 648, no. 2-3, pp. 139-148. https://doi.org/10.1016/j.physletb.2007.02.067
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. ; Bračko, M. ; Browder, T. E. ; Chang, P. ; Chen, A. ; Chen, W. T. ; 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, W. S. ; Iijima, T. ; Ikado, K. ; Imoto, A. ; Inami, K. ; Ishikawa, A. ; Itoh, R. ; Iwasaki, M. ; Iwasaki, Y. ; Kakuno, H. ; Kang, J. H. ; Kapusta, P. ; Kataoka, S. U. ; Kawai, H. ; Kawasaki, T. ; Khan, H. R. ; Kim, H. J. ; Kim, H. O. ; Kinoshita, K. ; Kozakai, Y. ; Križan, P. ; Krokovny, P. ; Kulasiri, R. ; Kumar, R. ; Kuo, C. C. ; Kuzmin, A. ; Kwon, Y. J. ; Lee, J. ; Lesiak, T. ; Li, J. ; Limosani, A. ; Lin, S. W. ; 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, S. L. ; Onuki, Y. ; Pakhlov, P. ; Park, C. W. ; Park, H. ; Peak, L. S. ; Pestotnik, R. ; Piilonen, L. E. ; Sakai, Y. ; Sato, N. ; Satoyama, N. ; Sayeed, K. ; Schietinger, T. ; Schneider, O. ; Schwanda, C. ; Schwartz, A. J. ; Senyo, K. ; Sevior, M. E. ; Shapkin, M. ; Shibuya, H. ; Shwartz, B. ; Somov, A. ; Stamen, R. ; Stanič, S. ; Starič, M. ; Stoeck, H. ; Sugiyama, A. ; Suzuki, S. ; Suzuki, S. Y. ; Tajima, O. ; Takasaki, F. ; Tamai, K. ; Tanaka, M. ; Taylor, G. N. ; Teramoto, Y. ; Tian, X. C. ; Tsukamoto, T. ; Ueno, K. ; Uglov, T. ; Unno, Y. ; Uno, S. ; Urquijo, P. ; Usov, Y. ; Varner, G. ; Varvell, K. E. ; Villa, S. ; Wang, C. C. ; Wang, C. H. ; Wang, M. Z. ; Watanabe, Y. ; Won, E. ; Yamaguchi, A. ; Yamashita, Y. ; Yamauchi, M. ; Ying, J. ; Zhang, L. M. ; Zhang, Z. P. ; Zürcher, D. / 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. In: Physics Letters B. 2007 ; Vol. 648, No. 2-3. pp. 139-148.
@article{cc10a02e6980411db57e1107daca957e,
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",
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. Bračko 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. Gorišek 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. Križan 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. Stanič and M. Starič 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",
year = "2007",
month = "5",
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 - 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.

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

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

KW - B decay

KW - Exclusive

KW - Semileptonic

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

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

U2 - 10.1016/j.physletb.2007.02.067

DO - 10.1016/j.physletb.2007.02.067

M3 - Article

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

SN - 0370-2693

IS - 2-3

ER -