Measurement of ZZ production in pp collisions at root s=7 TeV and limits on anomalous ZZZ and ZZ gamma couplings with the ATLAS detector [Elektronisk resurs]
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Aad, G (författare)
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Brenner, Richard (författare)
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Buszello, Claus P (författare)
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Coniavitis, Elias (författare)
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Ekelöf, Tord (författare)
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Ellert, Mattias (författare)
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Ferrari, Arnaud (författare)
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Isaksson, Charlie (författare)
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Pelikan, Daniel (författare)
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Zwalinski, L (författare)
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Uppsala universitet Teknisk-naturvetenskapliga vetenskapsområdet (utgivare)
- 2013
- Engelska.
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Ingår i: Journal of High Energy Physics (JHEP). - 1126-6708. ; 3, 128
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Sammanfattning
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- A measurement of the ZZ production cross section in proton-proton collisions at root s = 7 TeV using data recorded by the ATLAS experiment at the Large Hadron Collider is presented. In a data sample corresponding to an integrated luminosity of 4.6 fb(-1) collected in 2011, events are selected that are consistent either with two Z bosons decaying to electrons or muons or with one Z boson decaying to electrons or muons and a second Z boson decaying to neutrinos. The ZZ((*)) -> l(+)l(-)l'(+)l'(-) and ZZ -> l(+)l(-) nu(nu) over bar cross sections are measured in restricted phase-space regions. These results are then used to derive the total cross section for ZZ events produced with both Z bosons in the mass range 66 to 116 GeV, sigma(tot)(ZZ) = 6.7 +/- 0.7 (stat.) (+0.4)(-0.3) (syst.) +/- 0.3 (lumi.) pb, which is consistent with the Standard Model prediction of 5.89(-0.18)(+0.22) pb calculated at next-to-leading order in QCD. The normalized differential cross sections in bins of various kinematic variables are presented. Finally, the differential event yield as a function of the transverse momentum of the leading Z boson is used to set limits on anomalous neutral triple gauge boson couplings in ZZ production.
Ämnesord
- Natural Sciences (hsv)
- Naturvetenskap (hsv)
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