Search for new phenomena in events with two Z bosons and missing transverse momentum in pp¯ collisions at s=1.96 TeV Academic Article uri icon


  • We present a search for new phenomena in events with two reconstructed Z bosons and large missing transverse momentum, sensitive to processes pp̄→X 2X 2→ZZX 1X 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 4.2fb -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 pp̄→X 2X 2→ZZX 1X 1 ranging from 50 fb to 1 pb, depending on the masses of X 1 and X 2. © 2012 American Physical Society.

author list (cited authors)

  • Aaltonen, T., González, B., Amerio, S., Amidei, D., Anastassov, A., Annovi, A., ... Zucchelli, S.

citation count

  • 3

publication date

  • January 2012