The first observation of the decay B0s→to K∗0K∗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 to (K+π−)(K−π+) events are observed within ±50 MeV/c2 of the B0s mass and 746 MeV/c2 < mKπ < 1046 MeV/c2, mostly coming from a resonant B0s to K∗0K∗0 signal. The branching fraction and the CP-averaged K∗0longitudinal polarization fraction are measured to be B(B0s to K∗0K∗0) = (2.81±0.46(stat.)±0.45(syst.)± 0.34( fs/ fd))×10−5 and f L = 0.31±0.12(stat.) ±0.04(syst.).

First observation of the decay B0s to→K∗0K∗0

CARDINALE, ROBERTA;FONTANELLI, FLAVIO;PATRIGNANI, CLAUDIA;PETROLINI, ALESSANDRO;SANNINO, MARIO;
2012-01-01

Abstract

The first observation of the decay B0s→to K∗0K∗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 to (K+π−)(K−π+) events are observed within ±50 MeV/c2 of the B0s mass and 746 MeV/c2 < mKπ < 1046 MeV/c2, mostly coming from a resonant B0s to K∗0K∗0 signal. The branching fraction and the CP-averaged K∗0longitudinal polarization fraction are measured to be B(B0s to K∗0K∗0) = (2.81±0.46(stat.)±0.45(syst.)± 0.34( fs/ fd))×10−5 and f L = 0.31±0.12(stat.) ±0.04(syst.).
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11567/379533
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