Measurement of the Z-boson branching fraction into hadrons containing bottom quarks
We use the Mark II detector to study Z decays into bottom quark-anti-quark pairs, leading to the production of bottom hadrons. The Z bosons are formed in e{sup +}e{sup {minus}} annihilation at the SLC at center-of-mass energies between 89 and 93 GeV. We identify events containing semileptonic decays of bottom hadrons by detecting isolated leptons, i.e leptons with high transverse momenta relative to the nearest hadronic jet. Using isolated electrons and muons, we measure the B-hadron semileptonic branching ratio times the fraction of hadronic Z decays which contain bottom hadrons, B(B {yields} X{ell}{nu}){center dot}{Gamma}(Z {yields} b{bar b})/{Gamma}(Z {yields} had) = 0.025 {sub {minus}0.009}{sup +0.100} {plus minus} 0.005, where we have listed the statistical errors followed by the systematic error. Assuming B(B {yields} X(ell){nu}) = 11% {plus minus} 1%, we measure {Gamma}(Z {yields} b{bar b})/{Gamma}(Z {yields} had) = 0.23 {sub {minus}0.09}{sup +0.11}, in good agreement with the standard-model prediction of 0.22. We find {Gamma}(Z {yields} b{bar b}) = 0.40 {sub {minus}0.16}{sup +0.19} GeV. 83 refs., 34 figs., 19 tabs.
- Research Organization:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
- Sponsoring Organization:
- DOE/ER
- DOE Contract Number:
- AC03-76SF00098
- OSTI ID:
- 6415633
- Report Number(s):
- LBL-29485; ON: DE91001806; TRN: 91-000356
- Resource Relation:
- Other Information: Thesis (Ph.D.)
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
BEAUTY PARTICLES
PAIR PRODUCTION
Z NEUTRAL BOSONS
HADRONIC PARTICLE DECAY
BRANCHING RATIO
CROSS SECTIONS
ELECTRON-POSITRON INTERACTIONS
EXPERIMENTAL DATA
LEPTONS
MONTE CARLO METHOD
PARTICLE IDENTIFICATION
QUANTUM CHROMODYNAMICS
SEMILEPTONIC DECAY
SLC DETECTORS
STANDARD MODEL
STANFORD LINEAR COLLIDER
TRANSVERSE MOMENTUM
ACCELERATOR FACILITIES
ACCELERATORS
BOSONS
DATA
DECAY
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
INFORMATION
INTERACTIONS
INTERMEDIATE BOSONS
INTERMEDIATE VECTOR BOSONS
LEPTON-LEPTON INTERACTIONS
LINEAR ACCELERATORS
LINEAR MOMENTUM
MATHEMATICAL MODELS
NUMERICAL DATA
PARTICLE DECAY
PARTICLE INTERACTIONS
PARTICLE MODELS
QUANTUM FIELD THEORY
UNIFIED GAUGE MODELS
WEAK PARTICLE DECAY
645102* - High Energy Physics- Particle Interactions & Properties-Experimental- Weak Interactions & Properties