Measurement of CP asymmetries and polarisation fractions in Bs 0→K∗0K¯∗0 decays
- The LHCb collaboration,
- R. Aaij,
- B. Adeva,
- M. Adinolfi,
- A. Affolder,
- Z. Ajaltouni
- National Institute for Subatomic Physics,
- University of Santiago de Compostela,
- University of Bristol,
- University of Liverpool,
- Université Clermont Auvergne,
- CNRS
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Abstract
Abstract: An angular analysis of the decay B s 0→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 f L = 0.201 ± 0.057 (stat.) ± 0.040 (syst.) for the (Formula Presented) 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 ℬBs→ K∗ 8920 K¯∗ 8920 is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (f d/f s)) × 10 −6.
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Output type
Original language
EnglishArticle number
166Journal (Volume, Issue Number)
Journal of High Energy Physics (Volume 2015, Issue 7)Publication milestones
- Published - 06/07/2015
Publication status
ISSN
1126-6708Publication IDs
- Scopus: 84938590119