Heavy Flavor Production in $Z$ Decays

Decamp, D.; Deschizeaux, B.; Goy, C.; Lees, J.P.; Minard, M.N.; Crespo, J.M.; Delfino, M.; Fernandez, E.; Mato, P.; Miquel, R.

doi:10.1016/0370-2693(90)90362-A

Heavy Flavor Production in $Z$ Decays

ALEPH

Collaboration

Apr, 1990

15 pages

Published in:

Phys.Lett.B 244 (1990) 551-565

Published: 1990

DOI:

10.1016/0370-2693(90)90362-A

Report number:

CERN-EP/90-54

Experiments:

CERN-LEP-ALEPH

View in:

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Abstract: (Elsevier)

From an analysis of inclusive leptons in data collected by the ALEPH detector at LEP, we measure the fractions of b b and c c events in hadronic Z decays. The b b fraction times semileptonic branching ratio is measured to be Br ( b → e )·Γ b b /Γ had = 0.0224 ± 0.0016 ± 0.0010 . Assuming a b semileptonic branching ratio of 0.102 ± 0.010 gives Γ b b /Γ had = 0.220 ± 0.016 ± 0.024 , in good agreement with the standard model prediction of 0.217. The c c fraction times semileptonic branching ratio is measured to be Br ( c → e )·Γ c c /Γ had = 0.0133 ± 0.0040 −0.0031 +0.0038 . Assuming a c semileptonic branching ratio of 0.090 ± 0.013 gives Γ c c /Γ had = 0.148 ± 0.044 −0.038 +0.045 , in agreement with the standard model prediction of 0.171.

electron positron: colliding beams
colliding beams: electron positron
electron positron: annihilation
annihilation: electron positron
electron positron: inclusive reaction
Z0: electroproduction
electroproduction: Z0
Z0: nonleptonic decay
nonleptonic decay: Z0
charm

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