Measurement of the Inclusive B-Lifetime Using $$\rm {J/\psi}$$'s at the CDF Experiment

Thesis/Dissertation · Sun Aug 01 04:00:00 EDT 1993

DOI:https://doi.org/10.2172/992647· OSTI ID:992647

Wenzel, Hans-Joachim ^[1]

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1. 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: τ_B = 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
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
A CENTERS
BRANCHING RATIO
CROSS SECTIONS
DECAY
Experiment-HEP
FERMILAB COLLIDER DETECTOR
FERMILAB TEVATRON
HADRONS
LIFETIME
LUMINOSITY
PRODUCTION
SILICON
STATISTICS