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Observation of ZZ production in p-p collisions at sqrt s=1.96 TeV |
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| 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 |
| Institution: | Joint Institute for Nuclear Research, Dubna, Russia. |
| Abstract: | We present an observation for ZZ-->l+l-l'+l'- (l, l'=e or mu) production in pover]p collisions at a center-of-mass energy of sqrts]=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- nuover]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. |
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