We present a search for new phenomena in events with two reconstructed Z bosons and large missing transverse momentum, sensitive to processes p (p) over bar -> X2X2 -> ZZX(1)X(1), where X-2 is an unstable particle decaying as X-2 -> ZX(1) and X-1 is undetected. The particles X-1 and X-2 may be, among other possibilities, fourth-generation neutrinos or supersymmetric particles. We study the final state in which one Z boson decays to two charged leptons and the second decays hadronically. In data corresponding to an integrated luminosity of 4.2 fb(-1) from proton-antiproton collisions recorded by the CDF II detector at the Tevatron, with center-of-mass energy of 1.96 TeV, we find agreement between data and standard-model backgrounds. We calculate 95% confidence level upper limits on the cross section of the process p (p) over bar -> X2X2 -> ZZX(1)X(1) ranging from 50 fb to 1 pb, depending on the masses of X-1 and X-2.
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Titolo: | Search for new phenomena in events with two Z bosons and missing transverse momentum in p(p)over-bar collisions at root s=1.96 TeV | |
Autori: | ||
Data di pubblicazione: | 2012 | |
Rivista: | ||
Abstract: | We present a search for new phenomena in events with two reconstructed Z bosons and large missing transverse momentum, sensitive to processes p (p) over bar -> X2X2 -> ZZX(1)X(1), where X-2 is an unstable particle decaying as X-2 -> ZX(1) and X-1 is undetected. The particles X-1 and X-2 may be, among other possibilities, fourth-generation neutrinos or supersymmetric particles. We study the final state in which one Z boson decays to two charged leptons and the second decays hadronically. In data corresponding to an integrated luminosity of 4.2 fb(-1) from proton-antiproton collisions recorded by the CDF II detector at the Tevatron, with center-of-mass energy of 1.96 TeV, we find agreement between data and standard-model backgrounds. We calculate 95% confidence level upper limits on the cross section of the process p (p) over bar -> X2X2 -> ZZX(1)X(1) ranging from 50 fb to 1 pb, depending on the masses of X-1 and X-2. | |
Handle: | http://hdl.handle.net/11571/570720 | |
Appare nelle tipologie: | 1.1 Articolo in rivista |