Measurement of the Inclusive B-Lifetime Using $$\rm {J/\psi}$$'s at the CDF Experiment
- RWTH Aachen Univ. (Germany)
This dissertation describes the measurement of the average B hadron lifetime using a high statistics sample of B → J/ΨX decays produced in p$$\bar{p}$$ collisions at a center of mass energy of √s = 1.8 TeV at the Fermilab Tevatron. The integrated luminosity of the sample is 10.1 pb-1 recorded with the Collider Detector at Fermilab (CDF). In this analysis the decay vertex of the decay J/Ψ → μ+μ- as reconstructed by a silicon vertex detector is used to extract the lifetime from the data. This measurement is the average over all b-hadrons produced weighted by the product of their branching ratios into J/Ψ and their production cross sections. We find the following value for the average b hadron lifetime: τB = 1.46 ± 0.06(stat.) ± 0.06(syst.) ps. This is the first measurement of the b-hadron lifetime at a hadron collider. It demonstrates that it is possible to access the large b-quark production cross section in p$$\bar{p}$$ collisions and to achieve high statistics even in modes which have small product branching ratios as in this case: BR(B → J/ΨX) • BR(J/Ψ → μ+μ-) = 7.7 x 10-4.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 992647
- Report Number(s):
- FERMILAB-THESIS-1993-67; TRN: US201023%%157
- Country of Publication:
- United States
- Language:
- English
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Average and individual B hadron lifetimes at CDF
Measurement of the average lifetime of [ital B] hadrons produced in [ital p[bar p]] collisions at [radical][ital s] =1. 8 TeV