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Title: Search for WW and WZ production in lepton plus jets final state at CDF

Abstract

We present a search for WW and WZ production in final states that contain a charged lepton (electron or muon) and at least two jets, produced in {radical}(s)=1.96 TeV pp collisions at the Fermilab Tevatron, using data corresponding to 1.2 fb{sup -1} of integrated luminosity collected with the CDF II detector. Diboson production in this decay channel has yet to be observed at hadron colliders due to the large single W plus jets background. An artificial neural network has been developed to increase signal sensitivity, as compared with an event selection based on conventional cuts. We set a 95% confidence level upper limit of {sigma}{sub WW}xBR(W{yields}l{nu}{sub l},W{yields}jets)+{sigma}{sub WZ}xBR(W{yields}l{nu}{sub l},Z{yields}jets)<2.88 pb, which is consistent with the standard model next-to-leading-order cross section calculation for this decay channel of 2.09{+-}0.12 pb.

Authors:
; ; ; ; ; ;  [1]; ; ; ; ; ; ; ; ; ; ; ; ;  [2]
  1. Division of High Energy Physics, Department of Physics, University of Helsinki and Helsinki Institute of Physics, FIN-00014, Helsinki (Finland)
  2. Enrico Fermi Institute, University of Chicago, Chicago, Illinois 60637 (United States)
Publication Date:
OSTI Identifier:
21296419
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 79; Journal Issue: 11; Other Information: DOI: 10.1103/PhysRevD.79.112011; (c) 2009 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHARGED PARTICLES; CROSS SECTIONS; ELECTRONS; FERMILAB COLLIDER DETECTOR; FERMILAB TEVATRON; HADRONS; LUMINOSITY; MUONS; PARTICLE DECAY; PARTICLE PRODUCTION; PROTON-PROTON INTERACTIONS; SENSITIVITY; STANDARD MODEL; TEV RANGE 01-10

Citation Formats

Aaltonen, T, Maki, T, Mehtala, P, Orava, R, Osterberg, K, Saarikko, H, Remortel, N van, Adelman, J, Brubaker, E, Fedorko, W T, Grosso-Pilcher, C, Ketchum, W, Kim, Y K, Krop, D, Kwang, S, Lee, H S, Paramonov, A A, Schmidt, M A, Shiraishi, S, and Shochet, M. Search for WW and WZ production in lepton plus jets final state at CDF. United States: N. p., 2009. Web. doi:10.1103/PHYSREVD.79.112011.
Aaltonen, T, Maki, T, Mehtala, P, Orava, R, Osterberg, K, Saarikko, H, Remortel, N van, Adelman, J, Brubaker, E, Fedorko, W T, Grosso-Pilcher, C, Ketchum, W, Kim, Y K, Krop, D, Kwang, S, Lee, H S, Paramonov, A A, Schmidt, M A, Shiraishi, S, & Shochet, M. Search for WW and WZ production in lepton plus jets final state at CDF. United States. https://doi.org/10.1103/PHYSREVD.79.112011
Aaltonen, T, Maki, T, Mehtala, P, Orava, R, Osterberg, K, Saarikko, H, Remortel, N van, Adelman, J, Brubaker, E, Fedorko, W T, Grosso-Pilcher, C, Ketchum, W, Kim, Y K, Krop, D, Kwang, S, Lee, H S, Paramonov, A A, Schmidt, M A, Shiraishi, S, and Shochet, M. Mon . "Search for WW and WZ production in lepton plus jets final state at CDF". United States. https://doi.org/10.1103/PHYSREVD.79.112011.
@article{osti_21296419,
title = {Search for WW and WZ production in lepton plus jets final state at CDF},
author = {Aaltonen, T and Maki, T and Mehtala, P and Orava, R and Osterberg, K and Saarikko, H and Remortel, N van and Adelman, J and Brubaker, E and Fedorko, W T and Grosso-Pilcher, C and Ketchum, W and Kim, Y K and Krop, D and Kwang, S and Lee, H S and Paramonov, A A and Schmidt, M A and Shiraishi, S and Shochet, M},
abstractNote = {We present a search for WW and WZ production in final states that contain a charged lepton (electron or muon) and at least two jets, produced in {radical}(s)=1.96 TeV pp collisions at the Fermilab Tevatron, using data corresponding to 1.2 fb{sup -1} of integrated luminosity collected with the CDF II detector. Diboson production in this decay channel has yet to be observed at hadron colliders due to the large single W plus jets background. An artificial neural network has been developed to increase signal sensitivity, as compared with an event selection based on conventional cuts. We set a 95% confidence level upper limit of {sigma}{sub WW}xBR(W{yields}l{nu}{sub l},W{yields}jets)+{sigma}{sub WZ}xBR(W{yields}l{nu}{sub l},Z{yields}jets)<2.88 pb, which is consistent with the standard model next-to-leading-order cross section calculation for this decay channel of 2.09{+-}0.12 pb.},
doi = {10.1103/PHYSREVD.79.112011},
url = {https://www.osti.gov/biblio/21296419}, journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 11,
volume = 79,
place = {United States},
year = {2009},
month = {6}
}