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

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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 | Vu b |.

Original languageEnglish
Pages (from-to)139-148
Number of pages10
JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume648
Issue number2-3
DOIs
Publication statusPublished - 2007 May 3

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics

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    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