Limit on B(s)0 oscillation using a jet charge method
Collaboration
21 pages
Published in:
- Phys.Lett.B 356 (1995) 409-422
PDG: =
Report number:
- CERN-PPE-95-084,
- CERN-PPE-95-84,
- FSU-SCRI-95-99
Experiments:
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Abstract: (Elsevier)
A lower limit is set on the B s 0 meson oscillation parameter Δm s 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 Δm s . The 95% confidence level lower limit on Δm s ranges between 5.2 and 6.5 ( h ̷ c 2 ) ps −1 when the fraction of b quarks from Z 0 decays that form B s 0 messons is varied from 8% to 16%. Assuming that the B 0 s fraction is 12%, the lower limit would be Δm s > 6.1( h ̷ c 2 ) ps −1 at 95% confidence level. For x s = Δm s τ B s , this limit also gives x s > 8.8 using the B 0 s lifetime of τ B s = 1.55 ± 0.11 ps and shifting the central value of τ B s down by 1σ.- electron positron: colliding beams
- colliding beams: electron positron
- electron positron: annihilation
- annihilation: electron positron
- Z0: electroproduction
- electroproduction: Z0
- Z0: hadronic decay
- hadronic decay: Z0
- B0 anti-B0: oscillation
- B/s0 anti-B/s0: oscillation
References(19)
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