Search of W-associated Production of Single Top Quarks in CMS
Date Issued
2006
Date
2006
Author(s)
Lei, Yeong-Jyi
DOI
en-US
Abstract
The CMS (Compact Muon Solenoid) experiment is located at the LHC (Large Hardon Collider) proton-proton collider in CERN. The center of mass energy of the proton-proton collider is 14 TeV. The experiment plans to start taking data at early 2008.
Besides the pair top quark production observed by CDF (The Collider Detector at Fermilab) and D0 (DZero), the Standard Model also allows single top quark production which we expect to observe in the LHC with the CMS
detector. The single top is produced by electroweak interaction and this gives us a window to directly measure the CKM (Cabbibo-Kobayashi-Maskawa) matrix element |Vtb| since the production cross section is proportional to
jVtbj2. Assuming three quark generations or unitarity of the CKM matrix
can imply |Vtb|~1. However, if the fourth generation exists, |Vtb| can be any number smaller then 1. There are three modes of single top production: (1) t-channel, (2) s-channel, and (3)W associated production or tW. Based
on Monte Carlo simulation, a study of cross section and significance of tW production in the CMS experiment is presented in this thesis.
Subjects
夸克
單夸克
單一夸克
top
quark
single top
LHC
CMS
Type
thesis
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