We present a search for new phenomena in events with two reconstructed Z bosons and large missing transverse momentum, sensitive to processes pp̅ →X2X2→ZZX1X1, where X2 is an unstable particle decaying as X2→ZX1 and X1 is undetected. The particles X1 and X2 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 pp̅ →X2X2→ZZX1X1 ranging from 50 fb to 1 pb, depending on the masses of X1 and X2.

T. AALTONEN, B. ÁLVAREZ GONZÁLEZ, S. AMERIO, D. AMIDEI, A. ANASTASSOV, A. ANNOVI, et al. (2012). Search for new phenomena in events with two Z bosons and missing transverse momentum in pp̅ collisions at √s=1.96  TeV. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85, 011104-1-011104-7 [10.1103/PhysRevD.85.011104].

Search for new phenomena in events with two Z bosons and missing transverse momentum in pp̅ collisions at √s=1.96  TeV

BRIGLIADORI, LUCA;CASTRO, ANDREA;DENINNO, MARIA MADDALENA;MAZZANTI, PAOLO;MOGGI, NICCOLO';MUSSINI, MANUEL;RIMONDI, FRANCO;ZUCCHELLI, STEFANO
2012

Abstract

We present a search for new phenomena in events with two reconstructed Z bosons and large missing transverse momentum, sensitive to processes pp̅ →X2X2→ZZX1X1, where X2 is an unstable particle decaying as X2→ZX1 and X1 is undetected. The particles X1 and X2 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 pp̅ →X2X2→ZZX1X1 ranging from 50 fb to 1 pb, depending on the masses of X1 and X2.
2012
T. AALTONEN, B. ÁLVAREZ GONZÁLEZ, S. AMERIO, D. AMIDEI, A. ANASTASSOV, A. ANNOVI, et al. (2012). Search for new phenomena in events with two Z bosons and missing transverse momentum in pp̅ collisions at √s=1.96  TeV. PHYSICAL REVIEW D, PARTICLES, FIELDS, GRAVITATION, AND COSMOLOGY, 85, 011104-1-011104-7 [10.1103/PhysRevD.85.011104].
T. AALTONEN; B. ÁLVAREZ GONZÁLEZ; S. AMERIO; D. AMIDEI; A. ANASTASSOV; A. ANNOVI; J. ANTOS; G. APOLLINARI; J. APPEL; T. ARISAWA; A. ARTIKOV; J. ASAADI...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/122910
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