OPAL heavy/light flavour results

The results are grouped according to Electroweak, Lifetimes, CKM elements Vcb and Vub, Spectroscopy, Branching ratios, Inclusive production, Fragmentation, CP(T) violation, Oscillations and Light flavours. Some papers appear in more than one category.

For more details, contact the working group conveners: Pippa Wells and Richard Hawkings.

Partial widths:
• A Measurement of R_b using a Double Tagging Method.
  The OPAL Collab., G. Abbiendi et al.
  CERN-EP/98-137 Eur. Phys. J. C8 (1999) 217-239
• Measurement of f(c->D*+X), f(b->D*+X) and Gamma_cc(bar)/Gamma_had Using D*+- Mesons
  The OPAL Collaboration, K. Ackerstaff et al.
  CERN-PPE/97-093, Eur. Phys. J. C1 (1998) 439-459
• A Study of Charm Hadron Production in Z0 -> cc(bar) and Z0 -> bb(bar) decays at LEP
  . The OPAL Collaboration, G. Alexander et al.
  CERN-PPE/96-051, Zeit. fur Physik C72 (1996) 1-16.

Asymmetries:

• Updated Measurement of Heavy Quark Forward-Backward Asymmetries and Average B Mixing Using Leptons in Multihadronic Events
  OPAL Physics Note 226, 2nd July 1996.
  This is a preliminary update of:
  Measurement of Heavy Quark Forward-Backward Asymmetries and Average B Mixing Using Leptons in Multihadronic Events
  The OPAL Collaboration, G. Alexander et al.
  CERN-PPE/95-179, Zeit. fur Physik C70 (1996) 357-369.
• Measurements of the b Quark Forward-backward Asymmetry around the Z0 Peak Using Jet Charge and Vertex Charge
  The OPAL Collaboration, K. Ackerstaff et al.
  CERN-PPE/97-06, Zeit. f. Physik C 75 (1997) 385-396
• A Measurement of the Charm and Bottom Forward-Backward Asymmetries using D Mesons at LEP
  The OPAL Collaboration, G.Alexander et al.
  CERN-PPE/96-101, Zeit. fur Physik C73 (1997) 379-396.
• Corrections to the Bottom and Charm Forward-Backward Asymmetries
  OPAL Physics Note 284, 12th March 1997.
  This note documents updated QCD corrections to the above results

• Measurement of the B0 Lifetime and Oscillation Frequency using B0->D*+l-v decays
  The OPAL Collab., G. Abbiendi et al.
  CERN-EP-2000-090, Phys. Lett. B493 (2000) 266-280
• Measurement of the B+ and B0 Lifetimes and Search for CP(T) Violation using Reconstructed Secondary Vertices
  The OPAL Collab., G. Abbiendi et al.
  CERN-PPE/98-195, Eur. Phys. J. C12 (2000) 609-626
• A Measurement of the Average Bottom Hadron Lifetime
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/96-137, Zeit. fur Physik C73 (1997) 397-408.
• Measurement of the Average b Hadron Lifetime in Z0 Decays
  The OPAL Collab., P. Acton et al.
  CERN-PPE/93-92, Zeit. fur Physik C60 (1993) 217-228.
• Improved measurements of the B0 and B+ meson lifetimes
  The OPAL Collab., R. Akers et al.
  CERN-PPE/95-019, Zeit. fur Physik C67 (1995) 379-388.
• A Measurement of the B_s0 Lifetime Using Reconstructed D_s- Mesons
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/97-095, Euro. Phys. Journal C2 (1998) 407-416.
• Measurements of the B0_s and Lambda0_b Lifetimes
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/97-159, Phys. Letters B426 (1998) 161-179.
  This supercedes: An Improved Measurement of the B_s0 Lifetime
  The OPAL Collab., R. Akers et al.
  CERN-PPE/95-020, Phys. Lett. B350 (1995) 273-282.
  A Measurement of the Lambda0_b Lifetime
  The OPAL Collab., R. Akers et al.
  CERN-PPE/95-051, Phys. Lett. B353 402-412 (1995).
  
• Measurement of the Average b-Baryon Lifetime and the Product Branching Ratio f(b -> Lambda_b) . BR(Lambda_b -> Lambda lepton- nu(bar)X)
  The OPAL Collab., R. Akers et al.
  CERN-PPE/95-090, Zeit. f. Physik C 69 (1996) 195-21.

• A Measurement of V_cb Using B0(bar) -> D*+l-nu_l(bar) Decays
  The OPAL Collab., G.Abbiendi et al.
  CERN-EP-2000-32, Phys. Lett. B482 (2000) 15-30
  Superseding: A Measurement of V_cb Using B0(bar) -> D*+l-nu_l(bar) Decays
  The OPAL Collab., K.Ackerstaff et al.
  CERN-PPE/96-162, Phys. Lett. B395 (1997) 128-140.
  
• Measurement of Vub using b hadron semileptonic decay
  The OPAL Collab., G.Abbiendi et al.
  CERN-EP-2001-44, Eur. Phys. J. C21 (2001) 399-410
  

• A Search for a Radial Excitation of the D*+- Meson
  The OPAL Collab., K. Abbiendi et al.
  CERN-EP/2001-003, Eur. Phys. J.C20 (2001) 445-454.
• Investigation of the Decay of Orbitally-Excited B Mesons and First Measurement of the Branching Ratio BR ( B*_J -> B* pi )
  The OPAL Collab., K. Abbiendi et al.
  CERN-EP/2000-125, Submitted to Eur. Phys. J. C
• Determination of the Production rate of D*0 Mesons and of the Ratio V/(V+P) in Z0->ccbar decays
  The OPAL Collab., K. Ackerstaff et al.
  CERN-EP/98-006, Eur. Phys. J. C5 (1998) 1-17.
• Study of phi(1020), D*+- and B* Spin Alignment in Hadronic Z0 Decays
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/97-05, Zeit. fur Physik C74 (1997) 437-449.
• B* Production in Z0 Decays
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/96-192, Zeit. fur Physik C74 (1997) 413-422.
• Production of P-Wave Charm and Charm-Strange Mesons in Hadronic Z0 Decays
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/97-035, Zeit. fur Physik C76 (1997) 425-440.
• Observations of pi-B charge-flavor correlations and resonant Bpi and BK production
  The OPAL Collab., R. Akers et al.
  CERN-PPE/94-206, Zeit. fur Physik C66 (1995) 19-29.

Inclusive, semileptonic and baryonic decays

• Measurement of the Branching Ratio for the Process b -> tau nu X
  The OPAL Collaboration, G. Abbiendi et al.
  CERN-EP-2001-058, Phys Lett B 520 (2001) 1-10.
• Measurement of the Branching Ratio for D_s->tau nu_tau Decays
  The OPAL Collaboration, G. Abbiendi et al.
  CERN-EP-2001-019, Phys. Lett. B 516 (2001) 236-248.
• First Measurement of the Inclusive Branching Ratio of b Hadrons to phi Mesons in Z Decays
  The OPAL Collaboration, G. Abbiendi et al.
  CERN-EP-2000-065, Phys. Lett. B492 (2000) 13-22.
• Measurements of inclusive semileptonic branching fractions of b hadrons in Z0 decays
  The OPAL Collaboration, G. Abbiendi et al.
  CERN-EP/99-078, Eur. Phys. J. C13 (2000) 225-240.
• Measurement of the Semileptonic Branching Ratio of Charm Hadrons produced in Z0->cc Decays
  The OPAL Collaboration, G. Abbiendi et al
  CERN EP/98-146 Eur. Phys. J. C8 (1999) 573-584
• A Measurement of the Product Branching Ratio f(b->Lambda_b).BR(Lambda_b->Lambda+X) in Z0 Decays
  The OPAL Collaboration, G. Abbiendi et al
  CERN-EP/98-186, Eur. Phys J. C9 (1999) 1-9.
• Measurement of the Semileptonic Branching Fraction of Inclusive b Baryon Decays to Lambda
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/96-166, Zeit. fur Physik C74 (1997) 423-435.

J/psi and Upsilon production

• J/psi and psi' production in hadronic Z0 decays
  The OPAL Collab., G. Alexander et al.
  CERN-PPE/95-153, Zeit fur Physik C70 (1996) 197-209.
• Prompt J/psi Production in Hadronic Z0 Decays
  The OPAL Collab., G. Alexander et al.
  CERN-PPE/96-062, Phys. Lett. B384 (1996) 343-352.
• Observation of Upsilon Production in Hadronic Z0 Decays
  The OPAL Collab., G. Alexander et al.
  CERN-PPE/95-181, Physics Lett. B 370 (1996) 185-194

Rare decays and searches

• Search for New Physics in Rare B Decays
  The OPAL Collaboration, G. Abbiendi et al
  CERN EP/99-179, Phys. Lett. B476 (2000) 233-242
• Search for the B_c Meson in Hadronic Z0 Decays
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/97-137, Phys. Letters B 420 (1998) 157-168.
• Observation of Exclusive Decays of B Mesons at LEP
  The OPAL Collab., R. Akers et al.
  CERN-PPE/94-91, Phys. Letters B337 (1994) 196-206.
• Search for Rare Hadronic B Decays
  The OPAL Collab., R. Akers et al.
  CERN-PPE/94-98, Phys. Letters B337 (1994) 393-404.
• Evidence for the Existence of the Strange b-flavour Meson Bs0 in Z0 Decays
  The OPAL Collab., P. Acton et al.
  CERN-PPE/92-144, Phys. Letters B295 (1992) 357-370.

• Measurement of the Average Polarization of b Baryons in Hadronic Z0 Decay
  The OPAL Collab., G. Abbiendi et al.
  CERN-EP/98-119, Phys. Lett. B 444 (1998) 539-554.
• A Study of Charm Meson Production in Semileptonic B Decays
  The OPAL Collab., R. Akers et al.
  CERN-PPE/95-02, Zeit. fur Physik C67 (1995) 57-68.
• A Measurement of Charged Particle Multiplicity in Z0 -> cc(bar) and Z0 -> bb(bar) Events
  The OPAL Collab., R. Akers et al.
  CERN-PPE/95-038, Phys. Lett. B352 (1995) 176-186.
• A Study of Charm Hadron Production in Z0 -> cc(bar) and Z0 -> bb(bar) decays at LEP
  The OPAL Collab., G. Alexander et al.
  CERN-PPE/96-051, Zeit. fur Physik C72 (1996) 1-16.
  (Includes results on R_c and charm counting in b decays)
• Measurement of f(c->D*+X), f(b->D*+X) and Gamma_cc(bar)/Gamma_had Using D*+- Mesons
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/97-093, Euro. Phys. Journal C1 (1998) 439-459.
• A Measurement of the Production of D*+- Mesons on the Z0 Resonance
  The OPAL Collab., R. Akers et al.
  CERN-PPE/94-217, Zeit. fur Physik C67 (1995) 27-44.
• Measurement of the Production Rate of Charm Quark Pairs from Gluons in Hadronic Z0 Decays
  The OPAL Collaboration, G. Abbiendi et al.
  CERN-EP/99-089, Eur. Phys. J. C13 (2000) 1-13
• Production rates of bb(bar) quark pairs from gluons and bb(bar)bb(bar) events in hadronic Z Decays
  The OPAL Collaboration, G. Abbiendi et al.
  CERN-EP-2000-123, Eur. Phys. J. C18 (2001) 447-460.

• A study of b Quark Fragmentation into B0 and B+ Mesons at LEP
  The OPAL Collab., G. Alexander et al.
  CERN-PPE/95-122, Phys. Lett. B364 (1995) 93-106
• Measurements of inclusive semileptonic branching fractions of b hadrons in Z0 decays
  The OPAL Collaboration, G. Abbiendi et al.
  CERN-EP/99-078, Eur. Phys. J. C13 (2000) 225-240 .
• A Study of Charm Hadron Production in Z0 -> cc(bar) and Z0 -> bb(bar) decays at LEP
  The OPAL Collab., G. Alexander et al.
  CERN-PPE/96-051, Zeit. fur Physik C72 (1996) 1-16.
  
• A Measurement of the Production of D*+- Mesons on the Z0 Resonance
  The OPAL Collaboration, R. Akers et al.
  CERN-PPE/94-217, Zeit. fur Physik C67 (1995) 27-44
• Measurements of Flavour Dependent Fragmentation Functions in Z0 -> qq(bar) Events
  The OPAL Collaboration, K. Ackerstaff et al.
  CERN-EP/98-089, Eur. Phys. J. C 7 (1999) 369-381

Direct measurement of sin(2 beta)

• Investigation of CP Violation in B0->J/psi Ks Decays at LEP
  The OPAL Collab., K.Ackerstaff et al.
  CERN EP/98-001, Euro. Phys. Journal C5 (1998) 379-388.

CP(T) violation in inclusive hadronic and semileptonic B decays

• Measurement of the B+ and B0 Lifetimes and Search for CP(T) Violation using Reconstructed Secondary Vertices
  The OPAL Collab., G. Abbiendi et al.
  CERN-PPE/98-195, Eur. Phys. J. C12 (2000) 609-626
• A Study of B Meson Oscillations Using Hadronic Z0 Decays Containing Leptons
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/97-036, Zeit. fur Physik C76 (1997) 401.

• A Study of Bs meson oscillation using D_s-lepton correlations
  The OPAL Collab., G. Abbiendi et al.
  CERN-EP-2000-136, Euro. Phys. J C19 (2001) 241-256.
  
• Measurement of the B0 Lifetime and Oscillation Frequency using B0->D*+l-v decays
  The OPAL Collab., G. Abbiendi et al.
  CERN-EP-2000-090, Phys. Lett. B493 (2000) 266-280.
• A Study of B Meson Oscillations Using Hadronic Z0 Decays Containing Leptons
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/97-036, Zeit. fur Physik C76 (1997) 401.
  The delta m_s limit from the above paper is updated in:
• A Study of B_s0 Meson Oscillation Using Hadronic Z0 Decays Containing Leptons
  The OPAL Collaboration, G. Abbiendi et al
  CERN-EP/99-085, Eur. Phys. J.C11 (1999) 587-598.
• An Updated Study of B Meson Oscillations using Dilepton Events
  The OPAL Collab., K. Ackerstaff et al.
  CERN-PPE/97-064, Zeit. fur Physik C76 (1997) 417.
• A Measurement of the B0_d Oscillation Frequency Using Leptons and D*+- Mesons
  The OPAL Collab., R. Akers et al.
  CERN-PPE/96-074, Zeit. fur Physik C72 (1996) 377-388.

Time integrated mixing (chi-bar)

• Measurement of Heavy Quark Forward-Backward Asymmetries and Average B Mixing Using Leptons in Multihadronic Events>
  The OPAL Collab., G. Alexander et al.
  CERN-PPE/95-179, Zeit. fur Physik C70 (1996) 357-369.
• Measurements of B0-B(bar)0 mixing Gamma(Z0-bb(bar)/Gamma(Z0-hadrons) and semileptonic branching ratios for b-flavoured hadrons in hadronic Z0 decays
  The OPAL Collab., R. Akers et al.
  CERN-PPE/93-106, Zeit. fur Physik C60 (1993) 199-216.

• Leading Particle Production in Light Flavour Jets
  The OPAL Collaboration, G. Abbiendi et al.
  CERN-EP/99-164, Eur. Phys. J. C16 (2000) 407-421
• Measurement of the Branching Fractions and Forward-Backward Asymmetries of the Z0 into Light Quarks
  The OPAL Collaboration, K. Ackerstaff et al.
  CERN-PPE/97-063, Zeit. fur Physik C76 (1997) 387-400.

Last update: Richard Hawkings, 08-Dec-2001