Evidence for $$WZ/WW\to \ell \nu$$ + Heavy Flavors Vector Boson Production in 7.5 fb$$^{-1}$$ of CDF Data
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.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC)
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1027229
- Report Number(s):
- FERMILAB-CONF-11-517-E; arXiv eprint number arXiv:1110.0143; TRN: US1105186
- Resource Relation:
- Conference: Prepared for DPF 2011, Providence, Rhode Island, USA, 9-13 Aug 2011
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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