Observation of ZZ production in p-p collisions at sqrt s=1.96 TeV

• Published in: Physical review letters 2008-10, Vol.101 (17), p.171803
• Main Authors: Abazov, V M, Abbott, B, Abolins, M, Acharya, B S, Adams, M, Adams, T, Aguilo, E, Ahsan, M, Alexeev, G D, Alkhazov, G, Alton, A, Alverson, G, Alves, G A, Anastasoaie, M, Ancu, L S, Andeen, T, Andrieu, B, Anzelc, M S, Aoki, M, Arnoud, Y, Arov, M, Arthaud, M, Askew, A, Asman, B, Assis Jesus, A C S, Atramentov, O, Avila, C, Badaud, F, Bagby, L, Baldin, B, Bandurin, D V, Banerjee, P, Banerjee, S, Barberis, E, Barfuss, A-F, Bargassa, P, Baringer, P, Barreto, J, Bartlett, J F, Bassler, U, Bauer, D, Beale, S, Bean, A, Begalli, M, Begel, M, Belanger-Champagne, C, Bellantoni, L, Bellavance, A, Benitez, J A, Beri, S B, Bernardi, G, Bernhard, R, Bertram, I, Besançon, M, Beuselinck, R, Bezzubov, V A, Bhat, P C, Bhatnagar, V, Biscarat, C, Blazey, G, Blekman, F, Blessing, S, Bloom, K, Boehnlein, A, Boline, D, Bolton, T A, Boos, E E, Borissov, G, Bose, T, Brandt, A, Brock, R, Brooijmans, G, Bross, A, Brown, D, Bu, X B, Buchanan, N J, Buchholz, D, Buehler, M, Buescher, V, Bunichev, V, Burdin, S, Burnett, T H, Buszello, C P, Butler, J M, Calfayan, P, Calvet, S, Cammin, J, Carrera, E, Carvalho, W, Casey, B C K, Castilla-Valdez, H, Cerminara, G, Chakrabarti, S, Chakraborty, D, Chan, K M, Chandra, A, Cheu, E, Chevallier, F, Cho, D K, Choi, S
• Format: Article
• Language: English
• ISSN: 0031-9007

We present an observation for ZZ-->l+l-l'+l'- (l, l'=e or mu) production in p[over]p collisions at a center-of-mass energy of sqrt[s]=1.96 TeV. Using 1.7 fb(-1) of data collected by the D0 experiment at the Fermilab Tevatron Collider, we observe three candidate events with an expected background of 0.14(+0.03)_(-0.02) events. The significance of this observation is 5.3 standard deviations. The combination of D0 results in this channel, as well as in ZZ-->l+l- nu[over]nu, yields a significance of 5.7 standard deviations and a combined cross section of sigma(ZZ)=1.60+/-0.63(stat)+0.16_-0.17(syst) pb.