Measurement of the Zgamma to nunugamma cross section and limits on anomalous ZZgamma and Zgammagamma couplings in ppbar collisions at sqrt{s} = 1.96 TeV

0335425 - FZÚ 2010 RIV US eng J - Journal Article
Abazov, V. M. - Abbott, B. - Abolins, M. - Kupčo, Alexander - Lokajíček, Miloš … Total 499 authors
Measurement of the Zgamma to nunugamma cross section and limits on anomalous ZZgamma and Zgammagamma couplings in ppbar collisions at sqrt{s} = 1.96 TeV.
[Měření účinného průřezu Z/gamma -> neutrina a limity na anomální vazby ZZgamma a Z gamma gamma v proton antiprotonových srážkách při těžišťové energii 1.96 TeV.]
Physical Review Letters. Roč. 102, č. 20 (2009), 201802/1-201802/7. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LC527; GA MŠMT LA08047
Institutional research plan: CEZ:AV0Z10100502
Keywords : D0 * gamma
Subject RIV: BF - Elementary Particles and High Energy Physics
Impact factor: 7.328, year: 2009
http://arxiv.org/abs/0902.2157

We present the first observation of the Zgamma to nunugamma process at the Tevatron at 5.1 standard deviations significance, based on 3.6 fb-1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron ppbar Collider at sqrt{s} = 1.96 TeV. The measured Zgamma cross section multiplied by the branching fraction of Z to nunu is 32 +- 9 (stat.+syst.) +- 2 (lumi.) fb for the photon ET > 90 GeV. It is in agreement with the standard model prediction of 39 +- 4 fb. We set the most restrictive limits on anomalous trilinear Zgammagamma and ZZgamma gauge boson couplings at a hadron collider to date, with three constraints being the world's strongest.

Prezentujeme první pozorování procesu Z/gamma -> neutrina. Účinný průřez je v souhlasu s předpovědí Standardního modelu. Určujeme limity na anomální vazbu Z gamma gamma a Z Z gamma.
Permanent Link: http://hdl.handle.net/11104/0179893