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).

Aaltonen, T., Alvarez Gonzalez, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., et al. (2012). 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. PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85(1) [10.1103/PhysRevD.85.011104].

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

Maestro P;A. Scribano;P. Squillacioti;
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
Aaltonen, T., Alvarez Gonzalez, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., et al. (2012). 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. PHYSICAL REVIEW. D. PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85(1) [10.1103/PhysRevD.85.011104].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11365/20305
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