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Title: Measurement of WW + WZ production cross section and study of the dijet mass spectrum in the ℓν + jets final state at CDF

Abstract

We present the measurement of the WW and WZ production cross section in p$$\bar{p}$$ collisions at √s = 1.96 TeV, in a final state consisting of an electron or muon, neutrino and jets. The data analyzed were collected by the CDF II detector at the Tevatron collider and correspond to 4.3 fb -1 of integrated luminosity. The analysis uses a fit to the dijet mass distribution to extract the diboson contribution. We observe 1582 ± 275(stat.) ± 107(syst.) diboson candidate events and measure a cross section of σ WW/WZ = 18.1 ± 3.3(stat.) ± 2.5(syst.) pb, consistent with the Standard Model prediction of 15.9 ± 0.9 pb. The best fit to the dijet mass of the known components shows a good agreement with the data except for the [120, 160] GeV/c 2 mass range, where an excess is observed. We perform detailed checks of our background model and study the significance of the excess, assuming an additional gaussian component with a width compatible with the expected dijet mass resolution. A standard Δ χ 2 test of the presence of the additional component, returns a p-value of 4.2 x 10 -4 when standard sources of systematics are considered, corresponding to amore » significance of 3.3{sigma}.« less

Authors:
 [1]
  1. Univ. of Siena (Italy)
Publication Date:
Research Org.:
Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1007274
Report Number(s):
FERMILAB-THESIS-2010-51
TRN: US1101504
DOE Contract Number:  
AC02-07CH11359
Resource Type:
Thesis/Dissertation
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CROSS SECTIONS; ELECTRONS; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; FORECASTING; LUMINOSITY; MASS DISTRIBUTION; MASS RESOLUTION; NEUTRINOS; PRODUCTION; STANDARD MODEL; Experiment-HEP

Citation Formats

Cavaliere, Viviana. Measurement of WW + WZ production cross section and study of the dijet mass spectrum in the ℓν + jets final state at CDF. United States: N. p., 2010. Web. doi:10.2172/1007274.
Cavaliere, Viviana. Measurement of WW + WZ production cross section and study of the dijet mass spectrum in the ℓν + jets final state at CDF. United States. https://doi.org/10.2172/1007274
Cavaliere, Viviana. Fri . "Measurement of WW + WZ production cross section and study of the dijet mass spectrum in the ℓν + jets final state at CDF". United States. https://doi.org/10.2172/1007274. https://www.osti.gov/servlets/purl/1007274.
@article{osti_1007274,
title = {Measurement of WW + WZ production cross section and study of the dijet mass spectrum in the ℓν + jets final state at CDF},
author = {Cavaliere, Viviana},
abstractNote = {We present the measurement of the WW and WZ production cross section in p$\bar{p}$ collisions at √s = 1.96 TeV, in a final state consisting of an electron or muon, neutrino and jets. The data analyzed were collected by the CDF II detector at the Tevatron collider and correspond to 4.3 fb-1 of integrated luminosity. The analysis uses a fit to the dijet mass distribution to extract the diboson contribution. We observe 1582 ± 275(stat.) ± 107(syst.) diboson candidate events and measure a cross section of σWW/WZ = 18.1 ± 3.3(stat.) ± 2.5(syst.) pb, consistent with the Standard Model prediction of 15.9 ± 0.9 pb. The best fit to the dijet mass of the known components shows a good agreement with the data except for the [120, 160] GeV/c2 mass range, where an excess is observed. We perform detailed checks of our background model and study the significance of the excess, assuming an additional gaussian component with a width compatible with the expected dijet mass resolution. A standard Δχ2 test of the presence of the additional component, returns a p-value of 4.2 x 10-4 when standard sources of systematics are considered, corresponding to a significance of 3.3{sigma}.},
doi = {10.2172/1007274},
url = {https://www.osti.gov/biblio/1007274}, journal = {},
number = ,
volume = ,
place = {United States},
year = {2010},
month = {1}
}

Thesis/Dissertation:
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