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

Title: Evidence for $$WZ/WW\to \ell \nu$$ + Heavy Flavors Vector Boson Production in 7.5 fb$$^{-1}$$ of CDF Data

Abstract

This contribution describes a search for the associated production of Standard Model vector bosons WZ where the W boson decays leptonically (W {yields} {ell}{nu}) and the Z boson decays to a heavy flavor quark pair (Z {yields} b{bar b}, c{bar c}). At least one identified ('tagged') heavy flavor jet in the final state is required. Given the small di-jet invariant mass separation between the W and the Z resonances, the production of WW events where one W decays leptonically and the second W decays into an heavy flavor jet (e.i. W{sup + {yields} c{bar s}) contributes to our the signal. This search uses data collected with the CDF II detector at the Tevatron Collider at Fermilab, and corresponding to an integrated luminosity of approximately 7.5 fb{sup -1}. Events consistent with the signature of a charged lepton (electron or muon), large missing transverse energy and exactly two jets, of which at least one is required to contain a secondary vertex displaced from the jet origin, are selected. A multivariate discriminant based on the Support Vector Machine algorithm is used to reduce greatly the multi-jet background contamination. We observe a signal of significance of 3.03{sigma} over the background only hypothesis. A crossmore » section of 1.085{sub -0.40}{sup +0.26} times the expected Standard Model value for the combined WZ/WW production and decay into heavy flavors is measured, consistent with the Standard Model prediction.« less

Authors:
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE Office of Science (SC)
OSTI Identifier:
1027229
Report Number(s):
FERMILAB-CONF-11-517-E
arXiv eprint number arXiv:1110.0143; TRN: US1105186
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Conference
Resource Relation:
Conference: Prepared for DPF 2011, Providence, Rhode Island, USA, 9-13 Aug 2011
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; ALGORITHMS; BOSONS; CONTAMINATION; CROSS SECTIONS; DECAY; FERMILAB; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; FORECASTING; HYPOTHESIS; INTERMEDIATE BOSONS; LEPTONS; LUMINOSITY; ORIGIN; PRODUCTION; QUARKS; STANDARD MODEL; TRANSVERSE ENERGY; VECTORS; Z*BARYONS; Experiment-HEP

Citation Formats

Sforza, Federico, and /INFN, Pisa /Pisa U. Evidence for $WZ/WW\to \ell \nu$ + Heavy Flavors Vector Boson Production in 7.5 fb$^{-1}$ of CDF Data. United States: N. p., 2011. Web.
Sforza, Federico, & /INFN, Pisa /Pisa U. Evidence for $WZ/WW\to \ell \nu$ + Heavy Flavors Vector Boson Production in 7.5 fb$^{-1}$ of CDF Data. United States.
Sforza, Federico, and /INFN, Pisa /Pisa U. Sat . "Evidence for $WZ/WW\to \ell \nu$ + Heavy Flavors Vector Boson Production in 7.5 fb$^{-1}$ of CDF Data". United States.
@article{osti_1027229,
title = {Evidence for $WZ/WW\to \ell \nu$ + Heavy Flavors Vector Boson Production in 7.5 fb$^{-1}$ of CDF Data},
author = {Sforza, Federico and /INFN, Pisa /Pisa U.},
abstractNote = {This contribution describes a search for the associated production of Standard Model vector bosons WZ where the W boson decays leptonically (W {yields} {ell}{nu}) and the Z boson decays to a heavy flavor quark pair (Z {yields} b{bar b}, c{bar c}). At least one identified ('tagged') heavy flavor jet in the final state is required. Given the small di-jet invariant mass separation between the W and the Z resonances, the production of WW events where one W decays leptonically and the second W decays into an heavy flavor jet (e.i. W{sup + {yields} c{bar s}) contributes to our the signal. This search uses data collected with the CDF II detector at the Tevatron Collider at Fermilab, and corresponding to an integrated luminosity of approximately 7.5 fb{sup -1}. Events consistent with the signature of a charged lepton (electron or muon), large missing transverse energy and exactly two jets, of which at least one is required to contain a secondary vertex displaced from the jet origin, are selected. A multivariate discriminant based on the Support Vector Machine algorithm is used to reduce greatly the multi-jet background contamination. We observe a signal of significance of 3.03{sigma} over the background only hypothesis. A cross section of 1.085{sub -0.40}{sup +0.26} times the expected Standard Model value for the combined WZ/WW production and decay into heavy flavors is measured, consistent with the Standard Model prediction.},
doi = {},
url = {https://www.osti.gov/biblio/1027229}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2011},
month = {10}
}

Conference:
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 conference proceeding.

Save / Share: