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Please use this identifier to cite or link to this item: https://hdl.handle.net/2445/185723
Measurement of CP asymmetries and polarisation fractions in B-s(0) -> K*(0)(K)over-bar*(0) decays
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An angular analysis of the decay B0 s → 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 B0 s → 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(B0 s → K∗ (892)0K∗ (892)0 ) is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (fd/fs)) × 10−6 .
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CASANOVA MOHR, R., et al. Measurement of CP asymmetries and polarisation fractions in B-s(0) -> K*(0)(K)over-bar*(0) decays. Journal of High Energy Physics. 2015. Vol. 2015, num. 166, pags. 1-30. ISSN 1126-6708. [consulted: 17 of June of 2026]. Available at: https://hdl.handle.net/2445/185723