The first observation of the decay B0s → K∗0 anti-K∗0 is reported using 35 pb−1 of data collected by LHCb in proton–proton collisions at a centre-of-mass energy of 7 TeV. A total of 49.8 +-7.5 B0s -> (K+ π-)(K- pi+) events are observed within +-50 MeV/c^2 of the B0s mass and 746 MeV/c^2 < m(K pi) < 1046 MeV/c^2, mostly coming from a resonant B0s -> K∗0 anti-K∗0 signal. The branching fraction and the CP-averaged K∗0longitudinal polarization fraction are measured to be B(B0 -> K∗0 anti-K*0) = (2.81 +-0.46(stat.) +-0.45(syst.) +-0.34(fs/fd)) x 10^-5 and fL = 0.31 +-0.12(stat.) +-0.04(syst.).

First observation of the decay Bs0→K*0K̄*0 / R., A., C., A.B., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., G., A., P., A.C., A. A., A., S., A., Y., A., J., A., R. B., A., O., A.G., F., A., L., A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 709:1-2(2012), pp. 50-58. [10.1016/j.physletb.2012.02.001]

First observation of the decay Bs0→K*0K̄*0

BIZZETI, Andrea;
2012

Abstract

The first observation of the decay B0s → K∗0 anti-K∗0 is reported using 35 pb−1 of data collected by LHCb in proton–proton collisions at a centre-of-mass energy of 7 TeV. A total of 49.8 +-7.5 B0s -> (K+ π-)(K- pi+) events are observed within +-50 MeV/c^2 of the B0s mass and 746 MeV/c^2 < m(K pi) < 1046 MeV/c^2, mostly coming from a resonant B0s -> K∗0 anti-K∗0 signal. The branching fraction and the CP-averaged K∗0longitudinal polarization fraction are measured to be B(B0 -> K∗0 anti-K*0) = (2.81 +-0.46(stat.) +-0.45(syst.) +-0.34(fs/fd)) x 10^-5 and fL = 0.31 +-0.12(stat.) +-0.04(syst.).
2012
709
1-2
50
58
First observation of the decay Bs0→K*0K̄*0 / R., A., C., A.B., B., A., M., A., C., A., A., A., Z., A., J., A., F., A., M., A., G., A., P., A.C., A. A., A., S., A., Y., A., J., A., R. B., A., O., A.G., F., A., L., A., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - STAMPA. - 709:1-2(2012), pp. 50-58. [10.1016/j.physletb.2012.02.001]
R., Aaij; C., Abellan Beteta; B., Adeva; M., Adinolfi; C., Adrover; A., Affolder; Z., Ajaltouni; J., Albrecht; F., Alessio; M., Alexander; G., Alkhazo...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11380/709091
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