First Measurement of the Fraction of Top Quark Pair Production Through Gluon-Gluon Fusion

Details First Measurement of the Fraction of Top Quark Pair Production Through Gluon-Gluon Fusion First Measurement of the Fraction of Top Quark Pair Production Through Gluon-Gluon Fusion

2007-12-19

arxiv.org/abs/0712.3273v2

Phys.Rev.D78:111101,2008

Physics

High Energy Physics

High Energy Physics - Experiment

6 pages, 2 figures, Submitted to Phys.Rev.Lett, added 95% CL upper limit

Scientific paper

10.1103/PhysRevD.78.111101

We present the first measurement of the fraction of top quark pair production through gluon-gluon fusion. We use 0.96/fb of s**(1/2)=1.96 TeV p-pbar collision data recorded with the CDF II detector at Fermilab. We identify the candidate t-tbar events with a high-energy charged lepton, a neutrino candidate, and four or more jets. Using charged particles with low transverse momentum in t-tbar events, we find the fraction of top quark pair production through gluon-gluon fusion to be 0.07+/-0.14(stat)+/-0.07(syst), corresponding to a 95% confidence level upper limit of 0.33, in agreement with the standard model NLO prediction of 0.15+/-0.05.

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