Measurement of B - anti-B mixing at the Z

From more than 175 000 hadronic Z decays observed with the ALEPH detector at LEP, we select 823 events with pairs of leptons in the final state. From these we measure χ , the probability thata b hadron which is observed to decay originated as a b hadron. We find χ =0.132 −0.026 +0.027 .

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
Z0: electroproduction
electroproduction: Z0
Z0: nonleptonic decay
nonleptonic decay: Z0
hadron: multiple production
multiple production: hadron

References(24)

Figures(0)

CP Violation in Charmed Particle Decays

A. Pais
(
- Brookhaven
)
,
S.B. Treiman
(
- Brookhaven
)

- Phys.Rev.D 12 (1975) 2744-2750,
- Phys.Rev.D 16 (1977) 2390 (erratum)
•
DOI:
- 10.1103/PhysRevD.12.2744

Lefthanded Currents and CP Violation

- Nucl.Phys.B 109 (1976) 213-243
•
DOI:
- 10.1016/0550-3213(76)90203-0

B anti-B Mixing: A Review of Recent Progress

Paula J. Franzini
(
- CERN
)

- Phys.Rept. 173 (1989) 1
•
DOI:
- 10.1016/0370-1573(89)90132-4

Search for $B^0 - \bar{B}^0$ oscillations at the CERN proton-antiproton collider

UA1

Collaboration

•

C. Albajar
(
- CERN
)

et al.

- Phys.Lett.B 186 (1987) 2, 247-254,
- Phys.Lett.B 197 (1987) 4, 565 (erratum)
•
DOI:
- 10.1016/0370-2693(87)90288-7

Additional Evidence for B0 - Anti-b0 Mixing

MAC

Collaboration

•

H.R. Band
(
- Colorado U. and
- Frascati and
- Houston U. and
- Northeastern U. and
- SLAC and
- Utah U. and
- Wisconsin U., Madison
)

et al.

- Phys.Lett.B 200 (1988) 221-225
•
DOI:
- 10.1016/0370-2693(88)91140-9

A Reanalysis of B0 - Anti-b0 Mixing in $e^+ e^-$ Annihilation at 29-{GeV}

et al.

- Phys.Lett.B 240 (1990) 289-296
•
DOI:
- 10.1016/0370-2693(90)90447-E

Observation of B0 - anti-B0 Mixing

ARGUS

Collaboration

•

H. Albrecht
(
- DESY
)

et al.

- Phys.Lett.B 192 (1987) 245-252,
- In *Cahn, R.N., Goldhaber, G.: The experimental foundations of particle physics* 369-376,
•
DOI:
- 10.1016/0370-2693(87)91177-4

B0 anti-B0 Mixing at the Upsilon (4S)

CLEO

Collaboration

•

M. Artuso

et al.

- Phys.Rev.Lett. 62 (1989) 2233
•
DOI:
- 10.1103/PhysRevLett.62.2233

ALEPH: A detector for electron-positron annnihilations at LEP

ALEPH

Collaboration

•

D. Decamp
(
- Annecy, LAPP
)

et al.

- Nucl.Instrum.Meth.A 294 (1990) 121-178,
- Nucl.Instrum.Meth.A 303 (1991) 393 (erratum)
•
DOI:
- 10.1016/0168-9002(90)91831-U

Experimental Studies on Multi-Jet Production in e+ e- Annihilation at PETRA Energies

JADE

Collaboration

•

W. Bartel
(
- DESY
)

et al.

- Z.Phys.C 33 (1986) 23,
•
DOI:
- 10.1007/BF01410449

Experimental Investigation of the Energy Dependence of the Strong Coupling Strength

JADE

Collaboration

•

S. Bethke
(
- Heidelberg U.
)

et al.

- Phys.Lett.B 213 (1988) 235-241
•
DOI:
- 10.1016/0370-2693(88)91032-5

Heavy Flavor Production in $Z$ Decays

ALEPH

Collaboration

•

D. Decamp
(
- Annecy, LAPP
)

et al.

- Phys.Lett.B 244 (1990) 551-565
•
DOI:
- 10.1016/0370-2693(90)90362-A

Review of particle properties. Particle Data Group

J.J. Hernandez
(
- Valencia U. and
- CERN and
- Madrid, CIEMAT
)
,
L. Montanet
(
- Valencia U. and
- CERN and
- Madrid, CIEMAT
)
,
K. Gieselmann
(
- Valencia U. and
- CERN and
- Madrid, CIEMAT
)
,
M. Aguilar-Benitez
(
- Valencia U. and
- CERN and
- Madrid, CIEMAT
)
,
J. Stone
(
- Boston U.
)

et al.

- Phys.Lett.B 239 (1990) 1-515,
- Phys.Lett.B 253 (1991) 524-527 (erratum)
•
DOI:
- 10.1016/0370-2693(91)91762-K

The Lund Monte Carlo for Jet Fragmentation and e+ e- Physics. Jetset Version 6.3: An Update

- Comput.Phys.Commun. 43 (1987) 367
•
DOI:
- 10.1016/0010-4655(87)90054-3

Experimental Study of Inclusive Muon Spectra at PETRA

Aachen-DESY-Annecy(LAPP)-MIT-NIKHEF-Beijing

Collaboration

•

B. Adeva

et al.

- Phys.Rev.Lett. 51 (1983) 443,
- Phys. Rev. Lett. 51 (1983) 443-446 and Hamburg Desy - DESY 83-029 (83,REC.APR.) 12 P. (304530)
•
DOI:
- 10.1103/PhysRevLett.51.443

Inclusive Production of Electrons and Muons in Multi - Hadronic Events at {PETRA}

CELLO

Collaboration

•

H.J. Behrend
(
- DESY
)

et al.

- Z.Phys.C 19 (1983) 291
•
DOI:
- 10.1007/BF01577185

Fragmentation of Heavy Quarks Produced in $e^+ e^-$ Annihilation

et al.

- Phys.Rev.Lett. 50 (1983) 2054
•
DOI:
- 10.1103/PhysRevLett.50.2054

Production and Muonic Decay of Heavy Quarks in e+ e- Annihilation at 34.5-GeV

TASSO

Collaboration

•

M. Althoff
(
- Aachen, Tech. Hochsch.
)

et al.

- Z.Phys.C 22 (1984) 219
•
DOI:
- 10.1007/BF01575783

Inclusive Electron Production From Heavy Quarks in $e^+ e^-$ Annihilation at 34.6-{GeV} Center-of-mass Energy

TASSO

Collaboration

•

M. Althoff
(
- Aachen, Tech. Hochsch.
)

et al.

- Phys.Lett.B 146 (1984) 443-449,
- Phys. Lett. B146 (1984) 443-449 and Hamburg Desy - DESY 84-061 (84,REC.JUL.) 16p
•
DOI:
- 10.1016/0370-2693(84)90157-6