We present a search for a new heavy particle X produced in association with a top quark, p (p) over bar -> t(X -> (t) over bar q) or p (p) over bar -> (t) over bar((X) over bar -> t (q) over bar), where q stands for up quarks and down quarks. Such a particle may explain the recent anomalous measurements of top-quark forward-backward asymmetry. If the light-flavor quark (q) is reconstructed as a jet (j), this gives a (t) over bar + j or t + j resonance in t (t) over bar + jet events, a previously unexplored experimental signature. In a sample of events with exactly one lepton, missing transverse momentum and at least five jets, corresponding to an integrated luminosity of 8.7 fb(-1) collected by the CDF II detector, we find the data to be consistent with the standard model. We set cross-section upper limits on the production (p (p) over bar -> Xt or (X) over bar (t) over bar) at 95% confidence level from 0.61 pb to 0.02 pb for X masses ranging from 200 GeV/c(2) to 800 GeV/c(2), respectively.

T., A., J., A., B., Á.G., S., A., D., A., A., A., et al. (2012). Search for a Heavy Particle Decaying to a Top Quark and a Light Quark in p(p)over-bar Collisions at root s=1.96 TeV. PHYSICAL REVIEW LETTERS, 108(21) [10.1103/PhysRevLett.108.211805].

Search for a Heavy Particle Decaying to a Top Quark and a Light Quark in p(p)over-bar Collisions at root s=1.96 TeV

BARRIA, PATRIZIA;A. Cerri;GAROSI, PAOLA;MAESTRO, PAOLO;RUFFINI, FABRIZIO;SCRIBANO, ANGELO;SQUILLACIOTI, PAOLA;
2012-01-01

Abstract

We present a search for a new heavy particle X produced in association with a top quark, p (p) over bar -> t(X -> (t) over bar q) or p (p) over bar -> (t) over bar((X) over bar -> t (q) over bar), where q stands for up quarks and down quarks. Such a particle may explain the recent anomalous measurements of top-quark forward-backward asymmetry. If the light-flavor quark (q) is reconstructed as a jet (j), this gives a (t) over bar + j or t + j resonance in t (t) over bar + jet events, a previously unexplored experimental signature. In a sample of events with exactly one lepton, missing transverse momentum and at least five jets, corresponding to an integrated luminosity of 8.7 fb(-1) collected by the CDF II detector, we find the data to be consistent with the standard model. We set cross-section upper limits on the production (p (p) over bar -> Xt or (X) over bar (t) over bar) at 95% confidence level from 0.61 pb to 0.02 pb for X masses ranging from 200 GeV/c(2) to 800 GeV/c(2), respectively.
2012
T., A., J., A., B., Á.G., S., A., D., A., A., A., et al. (2012). Search for a Heavy Particle Decaying to a Top Quark and a Light Quark in p(p)over-bar Collisions at root s=1.96 TeV. PHYSICAL REVIEW LETTERS, 108(21) [10.1103/PhysRevLett.108.211805].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/26129
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