Test of lepton-flavor universality in ${B\to K^\ast\ell^+\ell^-}$ decays at Belle
Creators: name: Belle Collaboration
name: Wehle, S.
name: Adachi, I.
name: Adamczyk, K.
name: Aihara, H.
name: Asner, D. M.
name: Atmacan, H.
name: Aulchenko, V.
name: Aushev, T.
name: Ayad, R.
name: Babu, V.
name: Behera, P.
name: Berger, M.
name: Bhardwaj, V.
name: Biswal, J.
name: Bozek, A.
name: Bračko, M.
name: Browder, T. E.
name: Campajola, M.
name: Cao, L.
name: Chang, M. -C.
name: Chen, A.
name: Cheon, B. G.
name: Chilikin, K.
name: Cho, K.
name: Choi, Y.
name: Choudhury, S.
name: Cinabro, D.
name: Cunliffe, S.
name: Dash, N.
name: De Nardo, G.
name: Di Capua, F.
name: Dubey, S.
name: Eidelman, S.
name: Epifanov, D.
name: Ferber, T.
name: Fulsom, B. G.
name: Garg, R.
name: Gaur, V.
name: Gabyshev, N.
name: Garmash, A.
name: Giri, A.
name: Goldenzweig, P.
name: Greenwald, D.
name: Guan, Y.
name: Haba, J.
name: Hartbrich, O.
name: Hayasaka, K.
name: Hayashii, H.
name: Hedges, M. T.
name: Higuchi, T.
name: Hou, W. -S.
name: Hsu, C. -L.
name: Iijima, T.
name: Inami, K.
name: Inguglia, G.
name: Ishikawa, A.
name: Itoh, R.
name: Iwasaki, M.
name: Iwasaki, Y.
name: Jacobs, W. W.
name: Jia, S.
name: Jin, Y.
name: Joffe, D.
name: Kahn, J.
name: Kaliyar, A. B.
name: Karyan, G.
name: Kichimi, H.
name: Kim, D. Y.
name: Kim, K. T.
name: Kim, S. H.
name: Kim, Y. -K.
name: Kinoshita, K.
name: Komarov, I.
name: Korpar, S.
name: Kotchetkov, D.
name: Kroeger, R.
name: Krokovny, P.
name: Kuhr, T.
name: Kulasiri, R.
name: Kumar, R.
name: Kumara, K.
name: Kuzmin, A.
name: Kwon, Y. -J.
name: Lange, J. S.
name: Lee, J. Y.
name: Lee, S. C.
name: Li, Y. B.
name: Libby, J.
name: Liptak, Z.
name: Liventsev, D.
name: Luo, T.
name: MacNaughton, J.
name: Masuda, M.
name: Matsuda, T.
name: McNeil, J. T.
name: Merola, M.
name: Metzner, F.
name: Miyata, H.
name: Mizuk, R.
name: Mohanty, G. B.
name: Moon, T. J.
name: Mussa, R.
name: Nakao, M.
name: Natochii, A.
name: Nayak, M.
name: Niebuhr, C.
name: Niiyama, M.
name: Nisar, N. K.
name: Nishida, S.
name: Ogawa, K.
name: Ogawa, S.
name: Ono, H.
name: Onuki, Y.
name: Pakhlov, P.
name: Pakhlova, G.
name: Park, H.
name: Park, S. -H.
name: Pedlar, T. K.
name: Pestotnik, R.
name: Piilonen, L. E.
name: Podobnik, T.
name: Popov, V.
name: Prencipe, E.
name: Prim, M. T.
name: Resmi, P. K.
name: Ritter, M.
name: Rostomyan, A.
name: Rout, N.
name: Russo, G.
name: Sahoo, D.
name: Sakai, Y.
name: Sandilya, S.
name: Sangal, A.
name: Santelj, L.
name: Savinov, V.
name: Schneider, O.
name: Schnell, G.
name: Schueler, J.
name: Schwanda, C.
name: Schwartz, A. J.
name: Seino, Y.
name: Senyo, K.
name: Sevior, M. E.
name: Shapkin, M.
name: Shiu, J. -G.
name: Shwartz, B.
name: Solovieva, E.
name: Starič, M.
name: Strube, J. F.
name: Sumiyoshi, T.
name: Sutcliffe, W.
name: Takizawa, M.
name: Tamponi, U.
name: Tanida, K.
name: Tao, Y.
name: Tenchini, F.
name: Trabelsi, K.
name: Uchida, M.
name: Uglov, T.
name: Unno, Y.
name: Uno, S.
name: Ushiroda, Y.
name: Vahsen, S. E.
name: Van Tonder, R.
name: Varner, G.
name: Varvell, K. E.
name: Vorobyev, V.
name: Wang, C. H.
name: Wang, M. -Z.
name: Wang, P.
name: Wang, X. L.
name: Won, E.
name: Xu, X.
name: Yang, S. B.
name: Ye, H.
name: Yin, J. H.
name: Yuan, C. Z.
name: Zhang, Z. P.
name: Zhilich, V.
name: Zhukova, V.
name: Zhulanov, V.
Publisher: name: arXiv
Year: 2019
Subjects: subject: High Energy Physics - Experiment (hep-ex)
subject: FOS: Physical sciences
subject: FOS: Physical sciences

description: We present a measurement of $R_{K^{\ast}}$, the branching fraction ratio ${{\cal B}(B\to K^\ast μ^+ μ^-)}$/ ${{\cal B}(B\to K^\ast e^+ e^-)}$, for both charged and neutral $B$ mesons. The ratio for the charged case, $R_{K{^{\ast +}}}$, is the first measurement ever performed. In addition, we report absolute branching fractions for the individual modes in bins of the squared dilepton invariant mass, $q^2$. The analysis is based on a data sample of $711~\mathrm{fb}^{-1}$, containing $772\times 10^{6}$ $B\bar B$ events, recorded at the $Υ(4S)$ resonance with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. The obtained results are consistent with Standard Model expectations.
description: Submitted to PRL