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

The Lhcb Collaboration

Research output: Contribution to journalArticle

8 Scopus citations

Abstract

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 (US)
Article number166
JournalJournal of High Energy Physics
Volume2015
Issue number7
DOIs
StatePublished - Jul 6 2015

Keywords

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

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

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