Study of exclusive B→Xuℓν decays and extraction of |Vub| using full reconstruction tagging at the Belle experiment

A. Sibidanov; K. E. Varvell; I. Adachi; H. Aihara; D. M. Asner; V. Aulchenko; T. Aushev; A. M. Bakich; A. Bala; A. Bozek; M. Bračko; T. E. Browder; V. Chekelian; P. Chen; B. G. Cheon; K. Chilikin; R. Chistov; I. S. Cho; K. Cho; V. Chobanova; Y. Choi; D. Cinabro; J. Dalseno; M. Danilov; J. Dingfelder; Z. Doležal; Z. Drásal; A. Drutskoy; D. Dutta; S. Eidelman; D. Epifanov; H. Farhat; J. E. Fast; T. Ferber; A. Frey; V. Gaur; S. Ganguly; R. Gillard; Y. M. Goh; B. Golob; J. Haba; H. Hayashii; Y. Hoshi; W. S. Hou; H. J. Hyun; T. Iijima; A. Ishikawa; R. Itoh; Y. Iwasaki; T. Julius; D. H. Kah; J. H. Kang; T. Kawasaki; C. Kiesling; D. Y. Kim; H. J. Kim; J. B. Kim; J. H. Kim; K. T. Kim; Y. J. Kim; J. Klucar; B. R. Ko; P. Kodyš; S. Korpar; P. Križan; P. Krokovny; B. Kronenbitter; T. Kuhr; A. Kuzmin; Y. J. Kwon; S. H. Lee; J. Li; Y. Li; J. Libby; Y. Liu; D. Liventsev; P. Lukin; D. Matvienko; K. Miyabayashi; H. Miyata; G. B. Mohanty; A. Moll; R. Mussa; Y. Nagasaka; E. Nakano; M. Nakao; Z. Natkaniec; M. Nayak; E. Nedelkovska; C. Ng; N. K. Nisar; S. Nishida; O. Nitoh; T. Nozaki; S. Ogawa; S. Okuno; S. L. Olsen; C. Oswald; H. Park; H. K. Park; T. K. Pedlar; R. Pestotnik; M. Petrič; L. E. Piilonen; M. Ritter; M. Röhrken; A. Rostomyan; S. Ryu; H. Sahoo; T. Saito; Y. Sakai; S. Sandilya; L. Santelj; T. Sanuki; Y. Sato; V. Savinov; O. Schneider; G. Schnell; C. Schwanda; K. Senyo; O. Seon; M. E. Sevior; M. Shapkin; V. Shebalin; C. P. Shen; T. A. Shibata; J. G. Shiu; F. Simon; P. Smerkol; Y. S. Sohn; E. Solovieva; S. Stanič; M. Starič; M. Steder; M. Sumihama; K. Sumisawa; T. Sumiyoshi; G. Tatishvili; Y. Teramoto; K. Trabelsi; T. Tsuboyama; M. Uchida; S. Uehara; T. Uglov; Y. Unno; S. Uno; P. Urquijo; Y. Ushiroda; S. E. Vahsen; C. Van Hulse; P. Vanhoefer; G. Varner; V. Vorobyev; M. N. Wagner; C. H. Wang; P. Wang; M. Watanabe; Y. Watanabe; K. M. Williams; E. Won; B. D. Yabsley; Y. Yamashita; S. Yashchenko; Y. Yook; Z. P. Zhang; V. Zhilich; V. Zhulanov; A. Zupanc

doi:10.1103/PhysRevD.88.032005

Study of exclusive B→X_uℓν decays and extraction of |V_ub| using full reconstruction tagging at the Belle experiment

A. Sibidanov, K. E. Varvell, I. Adachi, H. Aihara, D. M. Asner, V. Aulchenko, T. Aushev, A. M. Bakich, A. Bala, A. Bozek, M. Bračko, T. E. Browder, V. Chekelian, P. Chen, B. G. Cheon, K. Chilikin, R. Chistov, I. S. Cho, K. Cho, V. ChobanovaY. Choi, D. Cinabro, J. Dalseno, M. Danilov, J. Dingfelder, Z. Doležal, Z. Drásal, A. Drutskoy, D. Dutta, S. Eidelman, D. Epifanov, H. Farhat, J. E. Fast, T. Ferber, A. Frey, V. Gaur, S. Ganguly, R. Gillard, Y. M. Goh, B. Golob, J. Haba, H. Hayashii, Y. Hoshi, W. S. Hou, H. J. Hyun, T. Iijima, A. Ishikawa, R. Itoh, Y. Iwasaki, T. Julius, D. H. Kah, J. H. Kang, T. Kawasaki, C. Kiesling, D. Y. Kim, H. J. Kim, J. B. Kim, J. H. Kim, K. T. Kim, Y. J. Kim, J. Klucar, B. R. Ko, P. Kodyš, S. Korpar, P. Križan, P. Krokovny, B. Kronenbitter, T. Kuhr, A. Kuzmin, Y. J. Kwon, S. H. Lee, J. Li, Y. Li, J. Libby, Y. Liu, D. Liventsev, P. Lukin, D. Matvienko, K. Miyabayashi, H. Miyata, G. B. Mohanty, A. Moll, R. Mussa, Y. Nagasaka, E. Nakano, M. Nakao, Z. Natkaniec, M. Nayak, E. Nedelkovska, C. Ng, N. K. Nisar, S. Nishida, O. Nitoh, T. Nozaki, S. Ogawa, S. Okuno, S. L. Olsen, C. Oswald, H. Park, H. K. Park, T. K. Pedlar, R. Pestotnik, M. Petrič, L. E. Piilonen, M. Ritter, M. Röhrken, A. Rostomyan, S. Ryu, H. Sahoo, T. Saito, Y. Sakai, S. Sandilya, L. Santelj, T. Sanuki, Y. Sato, V. Savinov, O. Schneider, G. Schnell, C. Schwanda, K. Senyo, O. Seon, M. E. Sevior, M. Shapkin, V. Shebalin, C. P. Shen, T. A. Shibata, J. G. Shiu, F. Simon, P. Smerkol, Y. S. Sohn, E. Solovieva, S. Stanič, M. Starič, M. Steder, M. Sumihama, K. Sumisawa, T. Sumiyoshi, G. Tatishvili, Y. Teramoto, K. Trabelsi, T. Tsuboyama, M. Uchida, S. Uehara, T. Uglov, Y. Unno, S. Uno, P. Urquijo, Y. Ushiroda, S. E. Vahsen, C. Van Hulse, P. Vanhoefer, G. Varner, V. Vorobyev, M. N. Wagner, C. H. Wang, P. Wang, M. Watanabe, Y. Watanabe, K. M. Williams, E. Won, B. D. Yabsley, Y. Yamashita, S. Yashchenko, Y. Yook, Z. P. Zhang, V. Zhilich, V. Zhulanov, A. Zupanc

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

159 Citations (Scopus)

Abstract

We report the results of a study of the exclusive semileptonic decays B^-→π0ℓ^-ν_̄ℓ, B ^̄0→π⁺ℓ ^-ν_̄ℓ, B^-→ρ0ℓ ^-ν_̄ℓ, B^̄0→ρ ⁺ℓ^-ν_̄ℓ and B ^-→ωℓ^-ν_̄ℓ, where ℓ represents an electron or a muon. The events are tagged by fully reconstructing a second B meson in the event in a hadronic decay mode. The measured branching fractions are B(B^-→π0ℓ ^-ν_̄ℓ)=(0.80±0.08±0.04) ×10^-4, B(B^̄0→π⁺ℓ ^-ν_̄ℓ)=(1.49±0.09±0.07) ×10^-4, B(B^-→ρ0ℓ ^-ν_̄ℓ)=(1.83±0.10±0.10) ×10^-4, B(B^̄0→ρ⁺ℓ ^-ν_̄ℓ)=(3.22±0.27±0.24) ×10^-4, and B(B^-→ωℓ ^-ν_̄ℓ)=(1.07±0.16±0.07) ×10^-4, where the first error is statistical and the second one is systematic. The obtained branching fractions are inclusive of soft photon emission. We also determine the branching fractions as a function of the 4-momentum transfer squared to the leptonic system q2=(p_ℓ+p _ν)², where p_ℓ and p_ν are the lepton and neutrino 4-momenta, respectively. Using the pion modes, a recent light cone sum rule calculation, lattice QCD results and a model-independent description of the hadronic form factor, a value of the Cabibbo-Kobayashi- Maskawa matrix element |V_ub|=(3.52±0.29)×10^-3 is extracted. A structure in the two-pion invariant mass distribution near 1.3 GeV/c2, which might be dominated by the decay B^-→f ₂(1270)ℓ^-ν_̄ℓ, f ₂→π⁺π^-, is seen. These results are obtained from a 711 fb^-1 data sample that contains 772×106 BB̄ pairs, collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e⁺e^- collider.

Original language	English
Article number	032005
Journal	Physical Review D - Particles, Fields, Gravitation and Cosmology
Volume	88
Issue number	3
DOIs	https://doi.org/10.1103/PhysRevD.88.032005
Publication status	Published - 2013 Aug 7

ASJC Scopus subject areas

Nuclear and High Energy Physics
Physics and Astronomy (miscellaneous)

Access to Document

10.1103/PhysRevD.88.032005

Cite this

Sibidanov, A., Varvell, K. E., Adachi, I., Aihara, H., Asner, D. M., Aulchenko, V., Aushev, T., Bakich, A. M., Bala, A., Bozek, A., Bračko, M., Browder, T. E., Chekelian, V., Chen, P., Cheon, B. G., Chilikin, K., Chistov, R., Cho, I. S., Cho, K., ... Zupanc, A. (2013). Study of exclusive B→X_uℓν decays and extraction of |V_ub| using full reconstruction tagging at the Belle experiment. Physical Review D - Particles, Fields, Gravitation and Cosmology, 88(3), Article 032005. https://doi.org/10.1103/PhysRevD.88.032005

Sibidanov, A, Varvell, KE, Adachi, I, Aihara, H, Asner, DM, Aulchenko, V, Aushev, T, Bakich, AM, Bala, A, Bozek, A, Bračko, M, Browder, TE, Chekelian, V, Chen, P, Cheon, BG, Chilikin, K, Chistov, R, Cho, IS, Cho, K, Chobanova, V, Choi, Y, Cinabro, D, Dalseno, J, Danilov, M, Dingfelder, J, Doležal, Z, Drásal, Z, Drutskoy, A, Dutta, D, Eidelman, S, Epifanov, D, Farhat, H, Fast, JE, Ferber, T, Frey, A, Gaur, V, Ganguly, S, Gillard, R, Goh, YM, Golob, B, Haba, J, Hayashii, H, Hoshi, Y, Hou, WS, Hyun, HJ, Iijima, T, Ishikawa, A, Itoh, R, Iwasaki, Y, Julius, T, Kah, DH, Kang, JH, Kawasaki, T, Kiesling, C, Kim, DY, Kim, HJ, Kim, JB, Kim, JH, Kim, KT, Kim, YJ, Klucar, J, Ko, BR, Kodyš, P, Korpar, S, Križan, P, Krokovny, P, Kronenbitter, B, Kuhr, T, Kuzmin, A, Kwon, YJ, Lee, SH, Li, J, Li, Y, Libby, J, Liu, Y, Liventsev, D, Lukin, P, Matvienko, D, Miyabayashi, K, Miyata, H, Mohanty, GB, Moll, A, Mussa, R, Nagasaka, Y, Nakano, E, Nakao, M, Natkaniec, Z, Nayak, M, Nedelkovska, E, Ng, C, Nisar, NK, Nishida, S, Nitoh, O, Nozaki, T, Ogawa, S, Okuno, S, Olsen, SL, Oswald, C, Park, H, Park, HK, Pedlar, TK, Pestotnik, R, Petrič, M, Piilonen, LE, Ritter, M, Röhrken, M, Rostomyan, A, Ryu, S, Sahoo, H, Saito, T, Sakai, Y, Sandilya, S, Santelj, L, Sanuki, T, Sato, Y, Savinov, V, Schneider, O, Schnell, G, Schwanda, C, Senyo, K, Seon, O, Sevior, ME, Shapkin, M, Shebalin, V, Shen, CP, Shibata, TA, Shiu, JG, Simon, F, Smerkol, P, Sohn, YS, Solovieva, E, Stanič, S, Starič, M, Steder, M, Sumihama, M, Sumisawa, K, Sumiyoshi, T, Tatishvili, G, Teramoto, Y, Trabelsi, K, Tsuboyama, T, Uchida, M, Uehara, S, Uglov, T, Unno, Y, Uno, S, Urquijo, P, Ushiroda, Y, Vahsen, SE, Van Hulse, C, Vanhoefer, P, Varner, G, Vorobyev, V, Wagner, MN, Wang, CH, Wang, P, Watanabe, M, Watanabe, Y, Williams, KM, Won, E, Yabsley, BD, Yamashita, Y, Yashchenko, S, Yook, Y, Zhang, ZP, Zhilich, V, Zhulanov, V & Zupanc, A 2013, 'Study of exclusive B→X_uℓν decays and extraction of |V_ub| using full reconstruction tagging at the Belle experiment', Physical Review D - Particles, Fields, Gravitation and Cosmology, vol. 88, no. 3, 032005. https://doi.org/10.1103/PhysRevD.88.032005

@article{591cb17ec13d43509715bc0b44a2b85e,

title = "Study of exclusive B→Xuℓν decays and extraction of |Vub| using full reconstruction tagging at the Belle experiment",

abstract = "We report the results of a study of the exclusive semileptonic decays B-→π0ℓ-{\=ν}ℓ, B{\= }0→π+ℓ -{\=ν}ℓ, B-→ρ0ℓ -{\=ν}ℓ, {\=B}0→ρ +ℓ-{\=ν}ℓ and B -→ωℓ-{\=ν}ℓ, where ℓ represents an electron or a muon. The events are tagged by fully reconstructing a second B meson in the event in a hadronic decay mode. The measured branching fractions are B(B-→π0ℓ -{\=ν}ℓ)=(0.80±0.08±0.04) ×10-4, B({\=B}0→π+ℓ -{\=ν}ℓ)=(1.49±0.09±0.07) ×10-4, B(B-→ρ0ℓ -{\=ν}ℓ)=(1.83±0.10±0.10) ×10-4, B({\=B}0→ρ+ℓ -{\=ν}ℓ)=(3.22±0.27±0.24) ×10-4, and B(B-→ωℓ -{\=ν}ℓ)=(1.07±0.16±0.07) ×10-4, where the first error is statistical and the second one is systematic. The obtained branching fractions are inclusive of soft photon emission. We also determine the branching fractions as a function of the 4-momentum transfer squared to the leptonic system q2=(pℓ+p ν)2, where pℓ and pν are the lepton and neutrino 4-momenta, respectively. Using the pion modes, a recent light cone sum rule calculation, lattice QCD results and a model-independent description of the hadronic form factor, a value of the Cabibbo-Kobayashi- Maskawa matrix element |Vub|=(3.52±0.29)×10-3 is extracted. A structure in the two-pion invariant mass distribution near 1.3 GeV/c2, which might be dominated by the decay B-→f 2(1270)ℓ-{\=ν}ℓ, f 2→π+π-, is seen. These results are obtained from a 711 fb-1 data sample that contains 772×106 B{\=B} pairs, collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.",

author = "A. Sibidanov and Varvell, {K. E.} and I. Adachi and H. Aihara and Asner, {D. M.} and V. Aulchenko and T. Aushev and Bakich, {A. M.} and A. Bala and A. Bozek and M. Bra{\v c}ko and Browder, {T. E.} and V. Chekelian and P. Chen and Cheon, {B. G.} and K. Chilikin and R. Chistov and Cho, {I. S.} and K. Cho and V. Chobanova and Y. Choi and D. Cinabro and J. Dalseno and M. Danilov and J. Dingfelder and Z. Dole{\v z}al and Z. Dr{\'a}sal and A. Drutskoy and D. Dutta and S. Eidelman and D. Epifanov and H. Farhat and Fast, {J. E.} and T. Ferber and A. Frey and V. Gaur and S. Ganguly and R. Gillard and Goh, {Y. M.} and B. Golob and J. Haba and H. Hayashii and Y. Hoshi and Hou, {W. S.} and Hyun, {H. J.} and T. Iijima and A. Ishikawa and R. Itoh and Y. Iwasaki and T. Julius and Kah, {D. H.} and Kang, {J. H.} and T. Kawasaki and C. Kiesling and Kim, {D. Y.} and Kim, {H. J.} and Kim, {J. B.} and Kim, {J. H.} and Kim, {K. T.} and Kim, {Y. J.} and J. Klucar and Ko, {B. R.} and P. Kody{\v s} and S. Korpar and P. Kri{\v z}an and P. Krokovny and B. Kronenbitter and T. Kuhr and A. Kuzmin and Kwon, {Y. J.} and Lee, {S. H.} and J. Li and Y. Li and J. Libby and Y. Liu and D. Liventsev and P. Lukin and D. Matvienko and K. Miyabayashi and H. Miyata and Mohanty, {G. B.} and A. Moll and R. Mussa and Y. Nagasaka and E. Nakano and M. Nakao and Z. Natkaniec and M. Nayak and E. Nedelkovska and C. Ng and Nisar, {N. K.} and S. Nishida and O. Nitoh and T. Nozaki and S. Ogawa and S. Okuno and Olsen, {S. L.} and C. Oswald 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 A. Rostomyan and S. Ryu and H. Sahoo and T. Saito and Y. Sakai and S. Sandilya and L. Santelj and T. Sanuki and Y. Sato and V. Savinov and O. Schneider and G. Schnell and C. Schwanda and K. Senyo and O. Seon and Sevior, {M. E.} and M. Shapkin and V. Shebalin and Shen, {C. P.} and Shibata, {T. A.} and Shiu, {J. G.} and F. Simon and P. Smerkol and Sohn, {Y. S.} and E. Solovieva and S. Stani{\v c} and M. Stari{\v c} and M. Steder and M. Sumihama and K. Sumisawa and T. Sumiyoshi and G. Tatishvili and Y. Teramoto and K. Trabelsi and T. Tsuboyama and M. Uchida and S. Uehara and T. Uglov and Y. Unno and S. Uno and P. Urquijo and Y. Ushiroda and Vahsen, {S. E.} and {Van Hulse}, C. and P. Vanhoefer and G. Varner and V. Vorobyev and Wagner, {M. N.} and Wang, {C. H.} and P. Wang and M. Watanabe and Y. Watanabe and Williams, {K. M.} and E. Won and Yabsley, {B. D.} and Y. Yamashita and S. Yashchenko and Y. Yook and Zhang, {Z. P.} and V. Zhilich and V. Zhulanov and A. Zupanc",

year = "2013",

month = aug,

day = "7",

doi = "10.1103/PhysRevD.88.032005",

language = "English",

volume = "88",

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

issn = "1550-7998",

publisher = "American Institute of Physics",

number = "3",

}

TY - JOUR

T1 - Study of exclusive B→Xuℓν decays and extraction of |Vub| using full reconstruction tagging at the Belle experiment

AU - Sibidanov, A.

AU - Varvell, K. E.

AU - Adachi, I.

AU - Aihara, H.

AU - Asner, D. M.

AU - Aulchenko, V.

AU - Aushev, T.

AU - Bakich, A. M.

AU - Bala, A.

AU - Bozek, A.

AU - Bračko, M.

AU - Browder, T. E.

AU - Chekelian, V.

AU - Chen, P.

AU - Cheon, B. G.

AU - Chilikin, K.

AU - Chistov, R.

AU - Cho, I. S.

AU - Cho, K.

AU - Chobanova, V.

AU - Choi, Y.

AU - Cinabro, D.

AU - Dalseno, J.

AU - Danilov, M.

AU - Dingfelder, J.

AU - Doležal, Z.

AU - Drásal, Z.

AU - Drutskoy, A.

AU - Dutta, D.

AU - Eidelman, S.

AU - Epifanov, D.

AU - Farhat, H.

AU - Fast, J. E.

AU - Ferber, T.

AU - Frey, A.

AU - Gaur, V.

AU - Ganguly, S.

AU - Gillard, R.

AU - Goh, Y. M.

AU - Golob, B.

AU - Haba, J.

AU - Hayashii, H.

AU - Hoshi, Y.

AU - Hou, W. S.

AU - Hyun, H. J.

AU - Iijima, T.

AU - Ishikawa, A.

AU - Itoh, R.

AU - Iwasaki, Y.

AU - Julius, T.

AU - Kah, D. H.

AU - Kang, J. H.

AU - Kawasaki, T.

AU - Kiesling, C.

AU - Kim, D. Y.

AU - Kim, H. J.

AU - Kim, J. B.

AU - Kim, J. H.

AU - Kim, K. T.

AU - Kim, Y. J.

AU - Klucar, J.

AU - Ko, B. R.

AU - Kodyš, P.

AU - Korpar, S.

AU - Križan, P.

AU - Krokovny, P.

AU - Kronenbitter, B.

AU - Kuhr, T.

AU - Kuzmin, A.

AU - Kwon, Y. J.

AU - Lee, S. H.

AU - Li, J.

AU - Li, Y.

AU - Libby, J.

AU - Liu, Y.

AU - Liventsev, D.

AU - Lukin, P.

AU - Matvienko, D.

AU - Miyabayashi, K.

AU - Miyata, H.

AU - Mohanty, G. B.

AU - Moll, A.

AU - Mussa, R.

AU - Nagasaka, Y.

AU - Nakano, E.

AU - Nakao, M.

AU - Natkaniec, Z.

AU - Nayak, M.

AU - Nedelkovska, E.

AU - Ng, C.

AU - Nisar, N. K.

AU - Nishida, S.

AU - Nitoh, O.

AU - Nozaki, T.

AU - Ogawa, S.

AU - Okuno, S.

AU - Olsen, S. L.

AU - Oswald, C.

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 - Rostomyan, A.

AU - Ryu, S.

AU - Sahoo, H.

AU - Saito, T.

AU - Sakai, Y.

AU - Sandilya, S.

AU - Santelj, L.

AU - Sanuki, T.

AU - Sato, Y.

AU - Savinov, V.

AU - Schneider, O.

AU - Schnell, G.

AU - Schwanda, C.

AU - Senyo, K.

AU - Seon, O.

AU - Sevior, M. E.

AU - Shapkin, M.

AU - Shebalin, V.

AU - Shen, C. P.

AU - Shibata, T. A.

AU - Shiu, J. G.

AU - Simon, F.

AU - Smerkol, P.

AU - Sohn, Y. S.

AU - Solovieva, E.

AU - Stanič, S.

AU - Starič, M.

AU - Steder, M.

AU - Sumihama, M.

AU - Sumisawa, K.

AU - Sumiyoshi, T.

AU - Tatishvili, G.

AU - Teramoto, Y.

AU - Trabelsi, K.

AU - Tsuboyama, T.

AU - Uchida, M.

AU - Uehara, S.

AU - Uglov, T.

AU - Unno, Y.

AU - Uno, S.

AU - Urquijo, P.

AU - Ushiroda, Y.

AU - Vahsen, S. E.

AU - Van Hulse, C.

AU - Vanhoefer, P.

AU - Varner, G.

AU - Vorobyev, V.

AU - Wagner, M. N.

AU - Wang, C. H.

AU - Wang, P.

AU - Watanabe, M.

AU - Watanabe, Y.

AU - Williams, K. M.

AU - Won, E.

AU - Yabsley, B. D.

AU - Yamashita, Y.

AU - Yashchenko, S.

AU - Yook, Y.

AU - Zhang, Z. P.

AU - Zhilich, V.

AU - Zhulanov, V.

AU - Zupanc, A.

PY - 2013/8/7

Y1 - 2013/8/7

N2 - We report the results of a study of the exclusive semileptonic decays B-→π0ℓ-ν̄ℓ, B ̄0→π+ℓ -ν̄ℓ, B-→ρ0ℓ -ν̄ℓ, B̄0→ρ +ℓ-ν̄ℓ and B -→ωℓ-ν̄ℓ, where ℓ represents an electron or a muon. The events are tagged by fully reconstructing a second B meson in the event in a hadronic decay mode. The measured branching fractions are B(B-→π0ℓ -ν̄ℓ)=(0.80±0.08±0.04) ×10-4, B(B̄0→π+ℓ -ν̄ℓ)=(1.49±0.09±0.07) ×10-4, B(B-→ρ0ℓ -ν̄ℓ)=(1.83±0.10±0.10) ×10-4, B(B̄0→ρ+ℓ -ν̄ℓ)=(3.22±0.27±0.24) ×10-4, and B(B-→ωℓ -ν̄ℓ)=(1.07±0.16±0.07) ×10-4, where the first error is statistical and the second one is systematic. The obtained branching fractions are inclusive of soft photon emission. We also determine the branching fractions as a function of the 4-momentum transfer squared to the leptonic system q2=(pℓ+p ν)2, where pℓ and pν are the lepton and neutrino 4-momenta, respectively. Using the pion modes, a recent light cone sum rule calculation, lattice QCD results and a model-independent description of the hadronic form factor, a value of the Cabibbo-Kobayashi- Maskawa matrix element |Vub|=(3.52±0.29)×10-3 is extracted. A structure in the two-pion invariant mass distribution near 1.3 GeV/c2, which might be dominated by the decay B-→f 2(1270)ℓ-ν̄ℓ, f 2→π+π-, is seen. These results are obtained from a 711 fb-1 data sample that contains 772×106 BB̄ pairs, collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.

AB - We report the results of a study of the exclusive semileptonic decays B-→π0ℓ-ν̄ℓ, B ̄0→π+ℓ -ν̄ℓ, B-→ρ0ℓ -ν̄ℓ, B̄0→ρ +ℓ-ν̄ℓ and B -→ωℓ-ν̄ℓ, where ℓ represents an electron or a muon. The events are tagged by fully reconstructing a second B meson in the event in a hadronic decay mode. The measured branching fractions are B(B-→π0ℓ -ν̄ℓ)=(0.80±0.08±0.04) ×10-4, B(B̄0→π+ℓ -ν̄ℓ)=(1.49±0.09±0.07) ×10-4, B(B-→ρ0ℓ -ν̄ℓ)=(1.83±0.10±0.10) ×10-4, B(B̄0→ρ+ℓ -ν̄ℓ)=(3.22±0.27±0.24) ×10-4, and B(B-→ωℓ -ν̄ℓ)=(1.07±0.16±0.07) ×10-4, where the first error is statistical and the second one is systematic. The obtained branching fractions are inclusive of soft photon emission. We also determine the branching fractions as a function of the 4-momentum transfer squared to the leptonic system q2=(pℓ+p ν)2, where pℓ and pν are the lepton and neutrino 4-momenta, respectively. Using the pion modes, a recent light cone sum rule calculation, lattice QCD results and a model-independent description of the hadronic form factor, a value of the Cabibbo-Kobayashi- Maskawa matrix element |Vub|=(3.52±0.29)×10-3 is extracted. A structure in the two-pion invariant mass distribution near 1.3 GeV/c2, which might be dominated by the decay B-→f 2(1270)ℓ-ν̄ℓ, f 2→π+π-, is seen. These results are obtained from a 711 fb-1 data sample that contains 772×106 BB̄ pairs, collected near the Υ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.

UR - http://www.scopus.com/inward/record.url?scp=84884825331&partnerID=8YFLogxK

U2 - 10.1103/PhysRevD.88.032005

DO - 10.1103/PhysRevD.88.032005

M3 - Article

AN - SCOPUS:84884825331

SN - 1550-7998

VL - 88

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

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

IS - 3

M1 - 032005

ER -

Study of exclusive B→X_uℓν decays and extraction of |V_ub| using full reconstruction tagging at the Belle experiment

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