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Article
Report number hep-ex/9707009 ; CERN-PPE-97-036 ; CERN-PPE-97-36 ; CERN-PPE-97-036
Title A study of B meson oscillations using hadronic Z0 decays containing leptons
Author(s) OPAL Collaboration  Visa alla 334 författare
Affiliation (CERN)
Publication 1997
Imprint 2 Apr 1997
Number of pages 36
Note 35 pages, LaTeX, 13 eps figures included, submitted to Zeit. f. Physik Report-no: CERN-PPE/97-036
In: Z. Phys. C 76 (1997) 401-415
DOI 10.1007/s002880050564
Subject category Particle Physics - Experiment
Accelerator/Facility, Experiment CERN LEP ; OPAL
Abstract An event sample enriched in semileptonic decays of b hadrons is selected using an inclusive lepton selection from approximately 3.0 million hadronic Z^0 decays collected with the OPAL detector. This sample is used to investigate B meson oscillations by reconstructing a proper decay time for the parent of each lepton, using a jet charge method to estimate the production flavour of this parent, and using the lepton charge to tag the decay flavour. We measure the mass difference between the two B^0_d mass eigenstates Delta(m_d) = 0.444 +/- 0.029 + 0.020 - 0.017 ps^-1. For the B^0_s system, we find Delta(m_s) > 3.1 ps^-1 at the 95% confidence level. This limit varies only a little if alternative limit setting approaches are adopted. Regions at higher Delta(m_s) are also excluded with some methods for setting the limit. By studying the charge symmetry of the B^0_d mixing structure, we are able to constrain possible CP and CPT violating effects. We measure the CP violation parameter Re(epsilon_B) = -0.006 +/- 0.010 +/- 0.006 and the indirect CPT violating parameter Im(delta_B) = -0.020 +/- 0.016 +/- 0.006. If we invoke CPT symmetry, then we obtain Re(epsilon_B) = 0.002 +/- 0.007 +/- 0.003.

Corresponding record in: Inspire


 Journalen skapades 1997-04-28, och modifierades senast 2021-10-29


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