# Measurement of CP asymmetries and polarisation fractions in B0s→K∗0K¯∗0 decays

Abstract : An angular analysis of the decay B0s→K∗0K¯∗0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb−1 collected by the LHCb experiment at a centre-of-mass energy s√=7 TeV. A combined angular and mass analysis separates six helicity amplitudes and allows the measurement of the longitudinal polarisation fraction fL=0.201±0.057(stat.)±0.040(syst.) for the B0s→K∗(892)0K¯∗(892)0 decay. A large scalar contribution from the K∗0(1430) and K∗0(800) resonances is found, allowing the determination of additional CP asymmetries. Triple product and direct CP asymmetries are determined to be compatible with the Standard Model expectations. The branching fraction B(B0s→K∗(892)0K¯∗(892)0) is measured to be (10.6±1.8(stat.)±1.0(syst.)±0.6(fd/fs))×10−6.
Document type :
Journal articles

http://hal.in2p3.fr/in2p3-01133368
Contributor : Sabine Starita <>
Submitted on : Thursday, March 19, 2015 - 10:50:31 AM
Last modification on : Thursday, February 25, 2021 - 10:58:34 AM

### Citation

R. Aaij, Y. Amhis, S. Barsuk, M. Borsato, O. Kochebina, et al.. Measurement of CP asymmetries and polarisation fractions in B0s→K∗0K¯∗0 decays. Journal of High Energy Physics, Springer, 2015, 07, pp.166. ⟨10.1007/JHEP07(2015)166⟩. ⟨in2p3-01133368⟩

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