# Observation of the B+→D∗−K+π+ decay

Abstract : The B+→D∗−K+π+ decay potentially provides an excellent way to investigate charm meson spectroscopy. The decay is searched for in a sample of proton-proton collision data collected with the LHCb detector at centre-of-mass energies of 7 and 8 TeV, corresponding to an integrated luminosity of 3 fb−1. A clear signal is observed, and the ratio of its branching fraction to that of the B+→D∗−π+π+ normalisation channel is measured to be B(B+→D∗−K+π+)B(B+→D∗−π+π+)=(6.39±0.27±0.48)×10−2, where the first uncertainty is statistical and the second is systematic. This is the first observation of the B+→D∗−K+π+ decay.

http://hal.in2p3.fr/in2p3-01514396
Contributor : Claudine Bombar <>
Submitted on : Wednesday, April 26, 2017 - 10:56:03 AM
Last modification on : Monday, June 3, 2019 - 1:38:03 PM

### Citation

R. Aaij, L. Beaucourt, M. Chefdeville, D. Decamp, N. Déléage, et al.. Observation of the B+→D∗−K+π+ decay. Physical Review D, American Physical Society, 2017, 96, pp.011101(R). ⟨10.1103/PhysRevD.96.011101⟩. ⟨in2p3-01514396⟩

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