Abstract
A lower limit is set on the Bs 0 meson oscillation parameter Δms using data collected from 1991 to 1994 by the ALEPH detector. Events with a high transverse momentum lepton and a reconstructed secondary vertex are used. The high transverse momentum leptons are produced mainly by b hadron decays, and the sign of the lepton indicates the particle/antiparticle final state in decays of neutral B mesons. The initial state is determined by a jet charge technique using both sides of the event. A maximum likelihood method is used to set a lower limit of Δms. The 95% confidence level lower limit on Δms ranges between 5.2 and 6.5 (h {combining short solidus overlay} c2) ps-1 when the fraction of b quarks from Z0 decays that form Bs 0 messons is varied from 8% to 16%. Assuming that the B0 s fraction is 12%, the lower limit would be Δms > 6.1( h {combining short solidus overlay} c2) ps-1 at 95% confidence level. For xs = ΔmsτBs , this limit also gives xs > 8.8 using the B0 s lifetime of τBs = 1.55 ± 0.11 ps and shifting the central value of τBs down by 1σ.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 409-422 |
| Number of pages | 14 |
| Journal | Physics Letters B |
| Volume | 356 |
| Issue number | 2-3 |
| DOIs | |
| State | Published - Aug 17 1995 |
Funding
6 Now at TSM Business School, Enschede, The Netherlands. ’ Supportedb y CICYT, Spain. * Supported by the National Science Foundation of China. g Supportedb y the Danish Natural Science Research Council. lo Supportedb y the UK Particle Physics and Astronomy Research Council. *I Supportedb y the US Departmento f Energy, contract DE-AC02- 76ER0088 I. ” On leave from Universitat Autonoma de Barcelona, Barcelona, Spain. I7 Supportedb y the US Departmentof Energy, contract DE-FGOS-92ER40742. ” Supportedb y the US DepartmentofEnergy, contract DE-FCOS-85ER250000. I5 Permanenta ddress:Universitat de Barcelona, 08208 Barcelona, Spain. I6 Supportedb y the Bundesministeriumf iir Forschung und Tech-nologie, Germany. ” Supportedb y the Direction des Sciences de la Matitre, C.E.A. Ix Supported by Fonds zur Fijrderung der wissenschaftlichen Forschung, Austria. ” Permanenta ddress: Kangnung National University, Kangnung, Korea. 2” Now at Dipartimento di Fisica, Universita di Milano, Milano, Italy. ” Also at CERN, 1211 Geneva 23, Switzerland. ” Supported by the US Departmento f Energy, grant DE-FG03-92ER40689. 23N ow at University of Athens, 157-71 Athens, Greece. ” Now at Lawrence Berkeley Laboratory, Berkeley, CA 94720, USA. ‘5 Partially supported by Colciencias, Colombia. ” Also at lstituto di Matematica e Fisica, UniversitB di Sassari, Sassari, Italy. “Now at Newman Laboratory, Cornell University. Ithaca, NY 14853, USA. 28N ow at SLAC, Stanford University, Stanford, CA 94309, USA. ” Now at SchusterL aboratory, University of Manchester,M anch-ester Ml3 9PL, UK. x”Now at Colorado State University, Fort Collins, CO 80523, USA. ” Now at University of California at San Diego, La Jolla, CA 92093, USA. x Now at Fermi National Accelerator Laboratory, Batavia, IL 605 10, USA. 33S upported by the Commission of the European Communities, contract ERBCHBICT941234. 7J Now at DESY, Hamburg 22603, Germany.
ASJC Scopus subject areas
- Nuclear and High Energy Physics