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First observation and measurement of the branching fraction for the decay B0s→D∗∓sK±

Abstract : The first observation of the B0s→D∗∓sK± decay is reported using 3.0fb−1 of proton-proton collision data collected by the LHCb experiment. The D∗∓s mesons are reconstructed through the decay chain D∗∓s→γD∓s(K∓K±π∓). The branching fraction relative to that for B0s→D∗−sπ+ is measured to be 0.068±0.005+0.003−0.002, where the first uncertainty is statistical and the second is systematic. Using a recent measurement of BR(B0s→D∗−sπ+) the absolute branching fraction of B0s→D∗∓sK± is measured as ( 16.3 ± 1.2 (stat) +0.7−0.5 (syst) ± 4.8 (norm) ) × 10−5, where the third uncertainty is due to the uncertainty on the branching fraction of the normalisation channel.
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http://hal.in2p3.fr/in2p3-01138309
Contributor : Sabine Starita <>
Submitted on : Wednesday, April 1, 2015 - 4:18:03 PM
Last modification on : Wednesday, September 16, 2020 - 4:28:23 PM

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R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. First observation and measurement of the branching fraction for the decay B0s→D∗∓sK±. Journal of High Energy Physics, Springer, 2015, 2015 (6), pp.130. ⟨10.1007/JHEP06(2015)130⟩. ⟨in2p3-01138309⟩

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