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Article
Report number arXiv:1503.05362 ; LHCB-PAPER-2014-068 ; CERN-PH-EP-2015-058 ; LHCB-PAPER-2014-068 ; CERN-PH-EP-2015-058
Title Measurement of CP asymmetries and polarisation fractions in Bs0K0K¯0 decays
Author(s) LHCb Collaboration  Εμφάνιση και των 707 συγγραφέων
Publication 2015-07-30
Imprint 19 Mar 2015
Number of pages 29
In: JHEP 07 (2015) 166
DOI 10.1007/JHEP07(2015)166
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LHC ; LHCb
Free keywords flavor physics ; branching fraction ; polarization ; CP violation
Abstract An angular analysis of the decay Bs0K0K¯0 is performed using pp collisions corresponding to an integrated luminosity of 1.0 fb1 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 Bs0K(892)0K¯(892)0 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 B(Bs0K(892)0K¯(892)0) is measured to be (10.8±2.1(stat.)±1.4(syst.)±0.6(fd/fs))×106.
Copyright/License preprint: © 2015-2024 CERN (License: CC-BY-4.0)
publication: © 2015-2024 CERN (License: CC-BY-4.0), sponsored by SCOAP³



Corresponding record in: Inspire
Email contact: carnita.hervet@cern.ch


 Δημιουργία εγγραφής 2015-03-19, τελευταία τροποποίηση 2024-08-17


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