Measurement of CP asymmetries and polarisation fractions in Bs0→K∗0K¯∗0 decays

The LHCb Collaboration

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Abstract: An angular analysis of the decay Bs0→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 (Formula Presented) decay. A large scalar contribution from the K0(1430) and K0(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∗8920K¯∗8920 is measured to be (10.8 ± 2.1 (stat.) ± 1.4 (syst.) ± 0.6 (fd/fs)) × 10−6.

Original languageEnglish
Article number166
Number of pages28
JournalJournal of High Energy Physics
Issue number7
Publication statusPublished - 6 Jul 2015
Externally publishedYes


  • CP violation
  • Hadron-Hadron Scattering
  • Polarization
  • B physics
  • Flavour Changing Neutral Currents

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