Search for new phenomena in events with two Z bosons and missing transverse momentum in pp̄ collisions at √s=1.96TeV
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.
Aaltonen, T; Alvarez González, B; Amerio, S; Amidei, D; Anastassov, A; Annovi, A; Antos, J; Apollinari, G; Appel, JA; Arisawa, T; Artikov, A; Asaadi, J; Ashmanskas, W; Auerbach, B; Aurisano, A; Azfar, F; Badgett, W; Bae, T; Barbaro-Galtieri, A; Barnes, VE; Barnett, BA; Barria, P; Bartos, P; Bauce, M; Bedeschi, F; Behari, S; Bellettini, G; Bellinger, J; Benjamin, D; Beretvas, A; Bhatti, A; Bisello, D; Bizjak, I; Bland, KR; Blumenfeld, B; Bocci, A; Bodek, A; Bortoletto, D; Boudreau, J; Boveia, A; Brigliadori, L; Bromberg, C; Brucken, E; Budagov, J; Budd, HS; Burkett, K; Busetto, G; Bussey, P; Buzatu, A; Calamba, A; Calancha, C; Camarda, S; Campanelli, M; Campbell, M; Canelli, F; Carls, B; Carlsmith, D; Carosi, R; Carrillo, S; Carron, S; Casal, B; Casarsa, M; Castro, A; Catastini, P; Cauz, D; Cavaliere, V; Cavalli-Sforza, M; Cerri, A; Cerrito, L; Chen, YC; Chertok, M; Chiarelli, G; Chlachidze, G; Chlebana, F; Cho, K; Chokheli, D; Chung, WH; Chung, YS; Ciocci, MA; Clark, A; Clarke, C; Compostella, G; Convery, ME; Conway, J; Corbo, M; Cordelli, M; Cox, CA; Cox, DJ; Crescioli, F; Cuevas, J; Culbertson, R; Dagenhart, D; D'Ascenzo, N; Datta, M; De Barbaro, P; Dell'orso, M; Demortier, L; Deninno, M; Devoto, F; D'Errico, M
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