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

Authors:Aaltonen, T.
Álvarez González, B.
Casal, Bruno
Cuevas, Javier
Gómez, G.
Gómez-Ceballos, Guillelmo
Palencia, Enrique
Rodrigo, Teresa
Scodellaro, Luca
Vila, Iván
Vilar, Rocío
Vizán, J.
CDF Collaboration
Issue Date:2012
Publisher:American Physical Society
Citation:Physical Review D 85(1): 011104(R) (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.
URI:http://hdl.handle.net/10261/52061
Identifiers:doi: 10.1103/PhysRevD.85.011104
issn: 1550-7998
e-issn: 1550-2368
Appears in Collections:(IFCA) Artículos

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