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Title: Search for single top quark production in pp collisions at {radical}(s)=1.96 TeV in the missing transverse energy plus jets topology

Abstract

We report a search for single top quark production with the CDF II detector using 2.1 fb{sup -1} of integrated luminosity of pp collisions at {radical}(s)=1.96 TeV. The data selected consist of events characterized by large energy imbalance in the transverse plane and hadronic jets, and no identified electrons and muons, so the sample is enriched in W{yields}{tau}{nu} decays. In order to suppress backgrounds, additional kinematic and topological requirements are imposed through a neural network, and at least one of the jets must be identified as a b quark jet. We measure an excess of signal-like events in agreement with the standard model prediction, but inconsistent with a model without single top quark production by 2.1 standard deviations ({sigma}), with a median expected sensitivity of 1.4{sigma}. Assuming a top quark mass of 175 GeV/c{sup 2} and ascribing the excess to single top quark production, the cross section is measured to be 4.9{sub -2.2}{sup +2.5}(stat+syst) pb, consistent with measurements performed in independent data sets and with the standard model prediction.

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:
21409452
Resource Type:
Journal Article
Journal Name:
Physical Review. D, Particles Fields
Additional Journal Information:
Journal Volume: 81; Journal Issue: 7; Other Information: DOI: 10.1103/PhysRevD.81.072003; (c) 2010 The American Physical Society; Journal ID: ISSN 0556-2821
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; B QUARKS; CROSS SECTIONS; ELECTRONS; FERMILAB COLLIDER DETECTOR; FORECASTING; HADRONS; LUMINOSITY; MASS; MUONS; PARTICLE DECAY; PROTON-PROTON INTERACTIONS; SENSITIVITY; STANDARD MODEL; T QUARKS; TEV RANGE 01-10; TOPOLOGY; TRANSVERSE ENERGY; BARYON-BARYON INTERACTIONS; BEAUTY PARTICLES; DECAY; ELEMENTARY PARTICLES; ENERGY; ENERGY RANGE; FERMIONS; FIELD THEORIES; GRAND UNIFIED THEORY; HADRON-HADRON INTERACTIONS; INTERACTIONS; KINETIC ENERGY; LEPTONS; MATHEMATICAL MODELS; MATHEMATICS; MEASURING INSTRUMENTS; NUCLEON-NUCLEON INTERACTIONS; OPTICAL PROPERTIES; PARTICLE INTERACTIONS; PARTICLE MODELS; PHYSICAL PROPERTIES; POSTULATED PARTICLES; PROTON-NUCLEON INTERACTIONS; QUANTUM FIELD THEORY; QUARKS; RADIATION DETECTORS; TEV RANGE; TOP PARTICLES; UNIFIED GAUGE MODELS

Citation Formats

Aaltonen, T, Mehtala, P, Orava, R, Osterberg, K, Saarikko, H, Remortel, N van, Adelman, J, Brubaker, E, Fedorko, W T, Grosso-Pilcher, C, Hurwitz, M, Ketchum, W, Kim, Y K, Krop, D, Kwang, S, Lee, H S, Schmidt, M A, Shiraishi, S, Shochet, M, and Tang, J. Search for single top quark production in pp collisions at {radical}(s)=1.96 TeV in the missing transverse energy plus jets topology. United States: N. p., 2010. Web. doi:10.1103/PHYSREVD.81.072003.
Aaltonen, T, Mehtala, P, Orava, R, Osterberg, K, Saarikko, H, Remortel, N van, Adelman, J, Brubaker, E, Fedorko, W T, Grosso-Pilcher, C, Hurwitz, M, Ketchum, W, Kim, Y K, Krop, D, Kwang, S, Lee, H S, Schmidt, M A, Shiraishi, S, Shochet, M, & Tang, J. Search for single top quark production in pp collisions at {radical}(s)=1.96 TeV in the missing transverse energy plus jets topology. United States. doi:10.1103/PHYSREVD.81.072003.
Aaltonen, T, Mehtala, P, Orava, R, Osterberg, K, Saarikko, H, Remortel, N van, Adelman, J, Brubaker, E, Fedorko, W T, Grosso-Pilcher, C, Hurwitz, M, Ketchum, W, Kim, Y K, Krop, D, Kwang, S, Lee, H S, Schmidt, M A, Shiraishi, S, Shochet, M, and Tang, J. Thu . "Search for single top quark production in pp collisions at {radical}(s)=1.96 TeV in the missing transverse energy plus jets topology". United States. doi:10.1103/PHYSREVD.81.072003.
@article{osti_21409452,
title = {Search for single top quark production in pp collisions at {radical}(s)=1.96 TeV in the missing transverse energy plus jets topology},
author = {Aaltonen, 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 Hurwitz, M and Ketchum, W and Kim, Y K and Krop, D and Kwang, S and Lee, H S and Schmidt, M A and Shiraishi, S and Shochet, M and Tang, J},
abstractNote = {We report a search for single top quark production with the CDF II detector using 2.1 fb{sup -1} of integrated luminosity of pp collisions at {radical}(s)=1.96 TeV. The data selected consist of events characterized by large energy imbalance in the transverse plane and hadronic jets, and no identified electrons and muons, so the sample is enriched in W{yields}{tau}{nu} decays. In order to suppress backgrounds, additional kinematic and topological requirements are imposed through a neural network, and at least one of the jets must be identified as a b quark jet. We measure an excess of signal-like events in agreement with the standard model prediction, but inconsistent with a model without single top quark production by 2.1 standard deviations ({sigma}), with a median expected sensitivity of 1.4{sigma}. Assuming a top quark mass of 175 GeV/c{sup 2} and ascribing the excess to single top quark production, the cross section is measured to be 4.9{sub -2.2}{sup +2.5}(stat+syst) pb, consistent with measurements performed in independent data sets and with the standard model prediction.},
doi = {10.1103/PHYSREVD.81.072003},
journal = {Physical Review. D, Particles Fields},
issn = {0556-2821},
number = 7,
volume = 81,
place = {United States},
year = {2010},
month = {4}
}