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Title:Search for Bc+ Going to Bs0 Pi+, Bs0 Going to J/psi Phi Decays at the CDF II Detector
Author(s):Rogers, Edwin Lloyd
Doctoral Committee Chair(s):Steven Errede; Kevin Pitts
Department / Program:Physics
Discipline:Physics
Degree Granting Institution:University of Illinois at Urbana-Champaign
Degree:Ph.D.
Genre:Dissertation
Subject(s):Physics, General
Abstract:This analysis details the search for B+c→B0s pi+, B0s → J/psi &phis; decays, and the charge conjugate mode, using the CDF II detector at the Fermi National Accelerator Laboratory. The search is derived from a sample of 5.84 fb-1 of data from pp¯ collisions of s = 1.96 TeV collected via J/psi trigger paths. Selection of candidate events within the Di-Muon trigger dataset is performed in two stages, both using artificial neural networks trained to select signal over combinatoric backgrounds. A 95% confidence upper limit is set on the number of B+c→B0s pi+ events within our sample, nsignal ≤ 4.15, for B0s candidate events of pT ≥ 4.0 GeV/ c and |eta| ≤ 1.0. Using this to compute the ratio sBc→Bsp sBs , a 95% confidence limit is set on the quantity fB+cfB 0s˙ B&parl0;B+c→B 0s pi+) ≤ 0.00683, where fB+c is the fragmentation fraction of b¯ quarks to B+c mesons and fB0s is the fragmentation fraction of b¯ quarks to B0s mesons. Assuming a ratio of fragmentation fractions fB+cfB 0s = 0.014, as estimated from yields in related experiments, a limit is placed on the branching fraction, B&parl0;B+c→B0 s pi+) ≤ 48.8%.
Issue Date:2010
Type:Text
Language:English
Description:206 p.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 2010.
URI:http://hdl.handle.net/2142/80636
Other Identifier(s):(MiAaPQ)AAI3455849
Date Available in IDEALS:2015-09-25
Date Deposited:2010


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