Abstract
A measurement of the differential branching fraction of the decay B 0 → K ∗(892)0 μ + μ − is presented together with a determination of the S-wave fraction of the K + π − system in the decay B 0 → K +π− μ + μ −. The analysis is based on pp-collision data corresponding to an integrated luminosity of 3 fb−1 collected with the LHCb experiment. The measurements are made in bins of the invariant mass squared of the dimuon system, q 2. Precise theoretical predictions for the differential branching fraction of B 0 → K ∗(892)0 μ + μ − decays are available for the q 2 region 1.1 < q 2 < 6.0 GeV2 /c 4. In this q 2 region, for the K +π− invariant mass range 796 < m Kπ < 996 MeV/c 2, the S-wave fraction of the K +π− system in B 0 → K +π− μ + μ − decays is found to be
and the differential branching fraction of B 0 → K ∗(892)0 μ + μ − decays is determined to be
The differential branching fraction measurements presented are the most precise to date and are found to be in agreement with Standard Model predictions.
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26 April 2017
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ArXiv ePrint: 1606.04731
Deceased (T. M. Karbach)
C. Baesso, M. Cruz Torres, C. Göbel and J. Molina Rodriguez are associated to Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
J. He, X. Lyu, Y. Zhang, Y. Xie, H. Yin and J. Yu are associated to Center for High Energy Physics, Tsinghua University, Beijing, China
D. A. Milanes, I. A. Monroy and J. A. Rodriguez Lopez are associated to LPNHE, Université Pierre et Marie Curie, Université Paris Diderot, CNRS/IN2P3, Paris, France
O. Grünberg, M. Heß, C. Voß and R. Waldi are associated to Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany
T. Likhomanenko, A. Malinin, A. Petrov, V. Shevchenko, A. Ustyuzhanin, M. Borisyak, D. Derkach, M. Hushchyn, E. Khairullin, T. Likhomanenko, A. Rogozhnikov and A. Ustyuzhanin are associated to Institute of Theoretical and Experimental Physics (ITEP), Moscow, Russia
F. Martinez Vidal, A. Oyanguren, C. Remon Alepuz, P. Ruiz Valls and C. Sanchez Mayordomo are associated to Universitat de Barcelona, Barcelona, Spain
C. J. G. Onderwater is associated to Nikhef National Institute for Subatomic Physics, Amsterdam, The Netherlands
An erratum to this article is available at https://doi.org/10.1007/JHEP04(2017)142.
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The LHCb collaboration., Aaij, R., Adeva, B. et al. Measurements of the S-wave fraction in B 0 → K + π − μ + μ − decays and the B 0 → K ∗(892)0 μ + μ − differential branching fraction. J. High Energ. Phys. 2016, 47 (2016). https://doi.org/10.1007/JHEP11(2016)047
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DOI: https://doi.org/10.1007/JHEP11(2016)047