skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurement of the Λ0b lifetime in Λ0b → Λ+cπ- decays at the Collider Detector at Fermilab

Abstract

The lifetime of the Λ0b baryon (consisting of u, d and b quarks) is the theoretically most interesting of all b-hadron lifetimes. The lifetime of Λ0b probes our understanding of how baryons with one heavy quark are put together and how they decay. Experimentally however, measurements of the Λ0b lifetime have either lacked precision or have been inconsistent with one another. This thesis describes the measurement of Λ0b lifetime in proton-antiproton collisions with center of mass energy of 1.96 TeV at Fermilab's Tevatron collider. Using 1070 ± 60pb-1 of data collected by the Collider Detector at Fermilab (CDF), a clean sample of about 3,000 fully-reconstructed Λ0b →Λc+π- decays (with Λ+c subsequently decaying via Λ+c → p+ K- π+) is used to extract the lifetime of the Λ0b baryon, which is found to be cτ(Λ0b) = 422.8 ± 13.8(stat) ± 8.8(syst)μm. This is the most precise measurement of its kind, and is even better than the current world average. It also settles the recent controversy regarding the apparent inconsistency between CDF's other measurement and the rest of the world.

Authors:
 [1]
  1. Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
982485
Report Number(s):
FERMILAB-THESIS-2008-97
TRN: US1004292
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ACCURACY; B QUARKS; BARYONS; DECAY; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; HADRONS; LIFETIME; QUARKS; Experiment-HEP

Citation Formats

Mumford, Jonathan Reid. Measurement of the Λ0b lifetime in Λ0b → Λ+cπ- decays at the Collider Detector at Fermilab. United States: N. p., 2008. Web. doi:10.2172/982485.
Mumford, Jonathan Reid. Measurement of the Λ0b lifetime in Λ0b → Λ+cπ- decays at the Collider Detector at Fermilab. United States. https://doi.org/10.2172/982485
Mumford, Jonathan Reid. 2008. "Measurement of the Λ0b lifetime in Λ0b → Λ+cπ- decays at the Collider Detector at Fermilab". United States. https://doi.org/10.2172/982485. https://www.osti.gov/servlets/purl/982485.
@article{osti_982485,
title = {Measurement of the Λ0b lifetime in Λ0b → Λ+cπ- decays at the Collider Detector at Fermilab},
author = {Mumford, Jonathan Reid},
abstractNote = {The lifetime of the Λ0b baryon (consisting of u, d and b quarks) is the theoretically most interesting of all b-hadron lifetimes. The lifetime of Λ0b probes our understanding of how baryons with one heavy quark are put together and how they decay. Experimentally however, measurements of the Λ0b lifetime have either lacked precision or have been inconsistent with one another. This thesis describes the measurement of Λ0b lifetime in proton-antiproton collisions with center of mass energy of 1.96 TeV at Fermilab's Tevatron collider. Using 1070 ± 60pb-1 of data collected by the Collider Detector at Fermilab (CDF), a clean sample of about 3,000 fully-reconstructed Λ0b →Λc+π- decays (with Λ+c subsequently decaying via Λ+c → p+ K- π+) is used to extract the lifetime of the Λ0b baryon, which is found to be cτ(Λ0b) = 422.8 ± 13.8(stat) ± 8.8(syst)μm. This is the most precise measurement of its kind, and is even better than the current world average. It also settles the recent controversy regarding the apparent inconsistency between CDF's other measurement and the rest of the world.},
doi = {10.2172/982485},
url = {https://www.osti.gov/biblio/982485}, journal = {},
number = ,
volume = ,
place = {United States},
year = {Mon Sep 01 00:00:00 EDT 2008},
month = {Mon Sep 01 00:00:00 EDT 2008}
}

Thesis/Dissertation:
Other availability
Please see Document Availability for additional information on obtaining the full-text document. Library patrons may search WorldCat to identify libraries that hold this thesis or dissertation.

Save / Share: