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Title: A Measurement of the Lifetime of the Λb Baryon with the CDF Detector at the Tevatron Run II

Abstract

In March 2001 the Tevatron accelerator entered its Run II phase, providing colliding proton and anti-proton beams with an unprecedented center-of-mass energy of 1.96 TeV. The Tevatron is currently the only accelerator to produce Λb baryons, which provides a unique opportunity to measure the properties of these particles. This thesis presents a measurement of the mean lifetime of the Λb baryon in the semileptonic channel Λ$$0\atop{b}$$ → Λ$$+\atop{c}$$ μ- $$\bar{v}$$μ. In total 186 pb-1 of data were used for this analysis, collected with the CDF detector between February 2002 and September 2003. To select the long-lived events from b-decays, the secondary vertex trigger was utilized. This significant addition to the trigger for Run II allows, for the first time, the selection of events with tracks displaced from the primary interaction vertex at the second trigger level. After the application of selection cuts this trigger sample contains approximately 991 Λb candidates. To extract the mean lifetime of Λb baryons from this sample, they transverse decay length of the candidates is fitted with an unbinned maximum likelihood fit under the consideration of the missing neutrino momentum and the bias introduced by the secondary vertex trigger. The mean lifetime of the Λb ismore » measured to be τ = 1.29 ± 0.11(stat.) ± 0.07(syst.) ps equivalent to a mean decay length of cτ = 387 ± 33(stat.) ± 21 (syst.) μm.« less

Authors:
 [1]
  1. Univ. of Glasgow, Scotland (United Kingdom)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
948158
Report Number(s):
FERMILAB-THESIS-2004-79
TRN: US0901570
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; 46 INSTRUMENTATION RELATED TO NUCLEAR SCIENCE AND TECHNOLOGY; ACCELERATORS; BARYONS; DECAY; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; LIFETIME; MAXIMUM-LIKELIHOOD FIT; NEUTRINOS; PROTONS; Experiment-HEP

Citation Formats

Unverhau, Tatjana Alberta Hanna. A Measurement of the Lifetime of the Λb Baryon with the CDF Detector at the Tevatron Run II. United States: N. p., 2004. Web. doi:10.2172/948158.
Unverhau, Tatjana Alberta Hanna. A Measurement of the Lifetime of the Λb Baryon with the CDF Detector at the Tevatron Run II. United States. https://doi.org/10.2172/948158
Unverhau, Tatjana Alberta Hanna. 2004. "A Measurement of the Lifetime of the Λb Baryon with the CDF Detector at the Tevatron Run II". United States. https://doi.org/10.2172/948158. https://www.osti.gov/servlets/purl/948158.
@article{osti_948158,
title = {A Measurement of the Lifetime of the Λb Baryon with the CDF Detector at the Tevatron Run II},
author = {Unverhau, Tatjana Alberta Hanna},
abstractNote = {In March 2001 the Tevatron accelerator entered its Run II phase, providing colliding proton and anti-proton beams with an unprecedented center-of-mass energy of 1.96 TeV. The Tevatron is currently the only accelerator to produce Λb baryons, which provides a unique opportunity to measure the properties of these particles. This thesis presents a measurement of the mean lifetime of the Λb baryon in the semileptonic channel Λ$0\atop{b}$ → Λ$+\atop{c}$ μ- $\bar{v}$μ. In total 186 pb-1 of data were used for this analysis, collected with the CDF detector between February 2002 and September 2003. To select the long-lived events from b-decays, the secondary vertex trigger was utilized. This significant addition to the trigger for Run II allows, for the first time, the selection of events with tracks displaced from the primary interaction vertex at the second trigger level. After the application of selection cuts this trigger sample contains approximately 991 Λb candidates. To extract the mean lifetime of Λb baryons from this sample, they transverse decay length of the candidates is fitted with an unbinned maximum likelihood fit under the consideration of the missing neutrino momentum and the bias introduced by the secondary vertex trigger. The mean lifetime of the Λb is measured to be τ = 1.29 ± 0.11(stat.) ± 0.07(syst.) ps equivalent to a mean decay length of cτ = 387 ± 33(stat.) ± 21 (syst.) μm.},
doi = {10.2172/948158},
url = {https://www.osti.gov/biblio/948158}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Wed Dec 01 00:00:00 EST 2004},
month = {Wed Dec 01 00:00:00 EST 2004}
}

Thesis/Dissertation:
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