Measurement of the branching ratio of B0 →d∗+τ- ν τ relative to B 0 →d∗+ℓ −νℓ decays with a semileptonic tagging method

Date Issued
27-10-2016
Author(s)
Sato, Y.
Iijima, T.
Adamczyk, K.
Aihara, H.
Asner, D. M.
Atmacan, H.
Aushev, T.
Ayad, R.
Aziz, T.
Babu, V.
Badhrees, I.
Bakich, A. M.
Bansal, V.
Behera, P.
Bhardwaj, V.
Bhuyan, B.
Biswal, J.
Bonvicini, G.
Bozek, A.
BraÄ ko, M.
ÄŒervenkov, D.
Chang, P.
Chekelian, V.
Chen, A.
Cheon, B. G.
Chilikin, K.
Chistov, R.
Cho, K.
Chobanova, V.
Choi, Y.
Cinabro, D.
Danilov, M.
Dash, N.
Di Carlo, S.
DoleŽal, Z.
Dutta, D.
Eidelman, S.
Epifanov, D.
Farhat, H.
Fast, J. E.
Ferber, T.
Fulsom, B. G.
Gaur, V.
Gabyshev, N.
Garmash, A.
Goldenzweig, P.
Golob, B.
Greenwald, D.
Hara, K.
Hara, T.
Hasenbusch, J.
Hayasaka, K.
Hayashii, H.
Hirose, S.
Horiguchi, T.
Hou, W. S.
Inami, K.
Ishikawa, A.
Itoh, R.
Iwasaki, Y.
Jaegle, I.
Jeon, H. B.
Joffe, D.
Julius, T.
Kang, K. H.
Kato, Y.
Katrenko, P.
Kawasaki, T.
Kim, D. Y.
Kim, J. B.
Kim, K. T.
Kim, M. J.
Kim, S. H.
Kim, Y. J.
Kinoshita, K.
Kodyš, P.
Korpar, S.
Kotchetkov, D.
Krokovny, P.
Kuhr, T.
Kumar, R.
Kwon, Y. J.
Lange, J. S.
Li, C. H.
Li, L.
Li, Y.
Li Gioi, L.
Indian Institute of Technology, Madras
Liventsev, D.
Luo, T.
Masuda, M.
Matsuda, T.
Matvienko, D.
Miyabayashi, K.
Miyata, H.
Mizuk, R.
Mohanty, G. B.
Moll, A.
Moon, H. K.
Nakamura, K. R.
DOI
Abstract
We report a measurement of the ratio R(D∗)=B(B0→D∗+τ-ντ)/B(B0→D∗+ν), where denotes an electron or a muon. The results are based on a data sample containing 772×106 BB pairs recorded at the (4S) resonance with the Belle detector at the KEKB e+e- collider. We select a sample of B0B0 pairs by reconstructing both B mesons in semileptonic decays to D∗ ±. We measure R(D∗)=0.302±0.030(stat)±0.011(syst), which is within 1.6σ of the Standard Model theoretical expectation, where the standard deviation σ includes systematic uncertainties. We use this measurement to constrain several scenarios of new physics in a model-independent approach.
Volume
94