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 -> X(2)X(2) -> 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 -> X(2)X(2) -> ZZX(1)X(1) ranging from 50 fb to 1 pb, depending on the masses of X(1) and X(2).

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

CIOCCI, MARIA AGNESE;DELL'ORSO, MAURO;DONATI, SIMONE;PUNZI, GIOVANNI;
2012-01-01

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 -> X(2)X(2) -> 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 -> X(2)X(2) -> ZZX(1)X(1) ranging from 50 fb to 1 pb, depending on the masses of X(1) and X(2).
2012
T., Aaltonen; B., Alvarez Gonzalez; S., Amerio; D., Amidei; A., Anastassov; A., Annovi; J., Antos; G., Apollinari; J. A., Appel; T., Arisawa; A., Arti...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11568/829045
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