Using data corresponding to 6.0 fb(-1) of p (p) over bar collisions at root s = 1.96 TeV collected by the CDF II detector, we present a cross section measurement of top-quark pair production with an additional radiated photon in the central region with 10 GeV or more of transverse energy t (t) over bar gamma. The events are selected by looking for a lepton (e or mu), a photon (gamma), significant transverse momentum imbalance (MET), large total transverse energy, and three or more jets, with at least one identified as containing a b quark (b). Using an event selection optimized for the t (t) over bar gamma candidate sample, we also measure the cross section of t (t) over bar (sigma(t (t) over bar)). We measure the t (t) over bar gamma cross section (sigma(t (t) over bar gamma)) to be (0.18 +/- 0.08) pb, and the ratio of sigma(t (t) over bar gamma) to sigma(t (t) over bar) to be 0.024 +/- 0.009. We observe a probability of 0.0015 (3.0 standard deviations) of the background non-t (t) over bar gamma events alone producing 30 events or more.
|Titolo:||Evidence for t(t)over-bar gamma production and measurement of sigma(t(t)over-bar gamma)/sigma(t(t)over-bar)|
|Citazione:||T., A., B., Á.G., S., A., D., A., A., A., A., A., et al. (2011). Evidence for t(t)over-bar gamma production and measurement of sigma(t(t)over-bar gamma)/sigma(t(t)over-bar). PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 84(3), 031104-1-031104-9.|
|Appare nelle tipologie:||1.1 Articolo in rivista|
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