We present a search for a new particle T' decaying to top quark via T' -> t + X, where X is an invisible particle. In a data sample with 4.8 fb(-1) of integrated luminosity collected by the CDF II detector at Fermilab in p (p) over bar collisions with root s = 1.96 TeV, we search for pair production of T' in the lepton + jets channel, p (p) over bar -> t (t) over bar + X + X -> lnubqq'b + X + X. We interpret our results primarily in terms of a model where T' are exotic fourth generation quarks and X are dark matter particles. Current direct and indirect bounds on such exotic quarks restrict their masses to be between 300 and 600 GeV/c(2), the dark matter particle mass being anywhere below m(T'). The data are consistent with standard model expectations, and we set 95% confidence level limits on the generic production of T'(T) over bar -> t (t) over bar + X + X. For the dark matter model we exclude T' at 95% confidence level up to m(T)' = 360 GeV/c(2) for m(X) <= 100 GeV/c(2).

T., A., B., Á.G., S., A., D., A., A., A., A., A., et al. (2011). Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in p(p)over-bar Collisions at root s=1.96 TeV. PHYSICAL REVIEW LETTERS, 106(19), 191801-1-191801-7 [10.1103/PhysRevLett.106.191801].

Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in p(p)over-bar Collisions at root s=1.96 TeV

BARRIA, PATRIZIA;GAROSI, PAOLA;RUFFINI, FABRIZIO;SCRIBANO, ANGELO;SQUILLACIOTI, PAOLA;
2011-01-01

Abstract

We present a search for a new particle T' decaying to top quark via T' -> t + X, where X is an invisible particle. In a data sample with 4.8 fb(-1) of integrated luminosity collected by the CDF II detector at Fermilab in p (p) over bar collisions with root s = 1.96 TeV, we search for pair production of T' in the lepton + jets channel, p (p) over bar -> t (t) over bar + X + X -> lnubqq'b + X + X. We interpret our results primarily in terms of a model where T' are exotic fourth generation quarks and X are dark matter particles. Current direct and indirect bounds on such exotic quarks restrict their masses to be between 300 and 600 GeV/c(2), the dark matter particle mass being anywhere below m(T'). The data are consistent with standard model expectations, and we set 95% confidence level limits on the generic production of T'(T) over bar -> t (t) over bar + X + X. For the dark matter model we exclude T' at 95% confidence level up to m(T)' = 360 GeV/c(2) for m(X) <= 100 GeV/c(2).
2011
T., A., B., Á.G., S., A., D., A., A., A., A., A., et al. (2011). Search for Production of Heavy Particles Decaying to Top Quarks and Invisible Particles in p(p)over-bar Collisions at root s=1.96 TeV. PHYSICAL REVIEW LETTERS, 106(19), 191801-1-191801-7 [10.1103/PhysRevLett.106.191801].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/42134
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