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Measurement of CP asymmetries and polarisation fractions in B[superscript 0][subscript s]→K[superscript ∗0][¯ over K][superscript ∗0] decays

Author(s)
Williams, Michael
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Abstract
An angular analysis of the decay B[subscript s][superscript 0] →K[superscript ∗0][¯ over K][superscript ∗0] is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb[superscript −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 f[subscript L] = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) decay. A large scalar contribution from the K[subscript 0][superscript ∗] (1430) and K[subscript 0][superscript ∗] (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(B[subscript s]→ K[superscript ∗] (892)[superscript 0] [¯ over K][superscript *] (892)[superscript 0] is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (f[subscript d]/f[subscript s])) × 10[superscript −6]. Keywords: CP violation, Hadron-Hadron Scattering, Polarization, B physics, Flavour Changing Neutral Currents
Date issued
2015-07
URI
http://hdl.handle.net/1721.1/116956
Department
Massachusetts Institute of Technology. Department of Physics
Journal
Journal of High Energy Physics
Publisher
Springer Nature
Citation
The LHCb collaboration, et al. “Measurement of CP Asymmetries and Polarisation Fractions in B[superscript 0][subscript s] → K[superscript ∗0][¯ over K][superscript ∗ 0] Decays.” Journal of High Energy Physics, vol. 2015, no. 7, July 2015. © 2015 The Authors
Version: Final published version
ISSN
1029-8479

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