Search for single top quark production in pp¯ collisions at s=1.96TeV in the missing transverse energy plus jets topology
Abstract
We report a search for single top quark production with the CDF II detector using 2.1fb-1 of integrated luminosity of pp¯ collisions at s=1.96TeV. 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→τν 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 (σ), with a median expected sensitivity of 1.4σ. Assuming a top quark mass of 175GeV/c2 and ascribing the excess to single top quark production, the cross section is measured to be 4.9-2.2+2.5(stat+syst)pb, consistent with measurements performed in independent data sets and with the standard model prediction.
- Publication:
-
Physical Review D
- Pub Date:
- April 2010
- DOI:
- 10.1103/PhysRevD.81.072003
- arXiv:
- arXiv:1001.4577
- Bibcode:
- 2010PhRvD..81g2003A
- Keywords:
-
- 12.15.Hh;
- 13.85.Ni;
- 14.65.Ha;
- Determination of Kobayashi-Maskawa matrix elements;
- Inclusive production with identified hadrons;
- Top quarks;
- High Energy Physics - Experiment
- E-Print:
- submitted to Phys. Rev. D