Journal article
Observation of ZZ production in pp̄ collisions at s=1.96TeV
VM Abazov, B Abbott, M Abolins, BS Acharya, M Adams, T Adams, E Aguilo, M Ahsan, GD Alexeev, G Alkhazov, A Alton, G Alverson, GA Alves, M Anastasoaie, LS Ancu, T Andeen, B Andrieu, MS Anzelc, M Aoki, Y Arnoud Show all
Physical Review Letters | AMER PHYSICAL SOC | Published : 2008
Open access
Abstract
We present an observation for ZZ→l+l-l′+l′- (l, l′=e or μ) production in pp̄ collisions at a center-of-mass energy of s=1.96TeV. Using 1.7fb-1 of data collected by the D0 experiment at the Fermilab Tevatron Collider, we observe three candidate events with an expected background of 0.14-0.02+0.03 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-νν̄, yields a significance of 5.7 standard deviations and a combined cross section of σ(ZZ)=1.60±0.63(stat)-0.17+0.16(syst) pb. © 2008 The American Physical Society.
Grants
Awarded by Science and Technology Facilities Council
Funding Acknowledgements
We thank the staffs at Fermilab and collaborating institutions, and acknowledge support from the DOE and NSF (USA); CEA and CNRS/IN2P3 (France); FASI, Rosatom, and RFBR (Russia); CNPq, FAPERJ, FAPESP, and FUNDUNESP (Brazil); DAE and DST (India); Colciencias (Colombia); CONACyT (Mexico); KRF and KOSEF (Korea); CONICET and UBACyT (Argentina); FOM (The Netherlands); STFC (United Kingdom); MSMT and GACR (Czech Republic); CRC Program, CFI, NSERC and WestGrid Project (Canada); BMBF and DFG (Germany); SFI (Ireland); The Swedish Research Council (Sweden); CAS and CNSF (China); Alexander von Humboldt Foundation (Germany); and the Istituto Nazionale di Fisica Nucleare (Italy).