First Measurement Of Zz Production In Panti P Collisions At S1 2
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First Measurement of ZZ Production in Panti-p Collisions at S**ư
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| Total Pages | : 7 |
| Release | : 2008 |
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We report the first measurement of the cross section for Z boson pair production at a hadron collider. This result is based on a data sample corresponding to 1.9 fb−1 of integrated luminosity from p{bar p} collisions at √s = 1.96 TeV collected with the CDF II detector at the Fermilab Tevatron. In the lll′l′ channel, we observe three ZZ candidates with an expected background of 0.096{sub -0.063}{sup +0.092} events. In the ll?? channel, we use a leading-order calculation of the relative ZZ and WW event probabilities to discriminate between signal and background. In the combination of lll′l′ and ll?? channels, we observe an excess of events with a probability of 5.1 x 10−6 to be due to the expected background. This corresponds to a significance of 4.4 standard deviations. The measured cross section is?(p{bar p} →ZZ) = 1.4{sub -0.6}{sup +0.7} (stat.+syst.) pb, consistent with the standard model expectation.
Measurement of the ZZ Production Cross Section and Z {u2192} L+l{u2013}l'+l'{u2013} Branching Fraction in Pp Collisions at
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| Total Pages | : 24 |
| Release | : 2016 |
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Here, four-lepton production in proton–proton collisions, pp→(Z/?*)(Z/?*)→l+l–l'+l'–,where l,l'=e or ?, is studied at a center-of-mass energy of 13 TeV with the CMS detector at the LHC. The data sample corresponds to an integrated luminosity of 2.6 fb–1. The ZZ production cross section, ?(pp → ZZ)=14.6–1.8+1.9(stat)–0.3+0.5(syst)±0.2(theo)±0.4(lumi)pb, is measured for events with two opposite-sign, same-flavor lepton pairs produced in the mass region 60msublsup+/suplsup–/sup/sub,ml'sup+/supl'sup–/sup120 GeV60mlsup+/suplsup–/sup,ml'sup+/supl'sup–/sup120 GeV. The Z boson branching fraction to four leptons is measured to be B(Z→lsup+/suplsup–/supl'sup+/supl'sup–/sup)=4.9sub–0.7/subsup+0.8/sup (stat)sub–0.2/subsup+0.3/sup (syst)–0.1+0.2(theo)±0.1(lumi)×10sup–6/sup for the four-lepton invariant mass in the range 80mlsup+/suplsup–/supl'sup+/supl'sup–/sup100 GeV80mlsup+/suplsup–/supl'sup+/supl'sup–/sup
Measurement of WZ and ZZ Production in Pp Collisions at $\sqrt{s}
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| Total Pages | : 22 |
| Release | : 2014 |
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Measurements are reported of the WZ and ZZ production cross sections in proton-proton collisions at $\sqrt{s}$ = 8 TeV in final states where one Z boson decays to b-tagged jets. The other gauge boson, either W or Z, is detected through its leptonic decay (either $W \to e\nu, \mu\nu$ or $Z \to e^+ e^-, \mu^+ \mu^-$, or $\nu\bar{\nu})$. The results are based on data corresponding to an integrated luminosity of 18.9 inverse-femtobarns collected with the CMS detector at the Large Hadron Collider. The measured cross sections, $\sigma(pp \to WZ)$ = 30.7 $\pm$ 9.3 (stat.) $\pm$ 7.1 (syst.) $\pm$ 4.1 (th.) $\pm$ 1.0 (lum.) pb and $\sigma(pp \to ZZ)$ = 6.5 $\pm$ 1.7 (stat.) $\pm$ 1.0 (syst.) $\pm$ 0.9 (th.) $\pm$ 0.2 (lum.) pb, are consistent with next-to-leading order quantum chromodynamics calculations.
Measurement of the $ZZ$ Production Cross Section in $p\bar{p}$ Collisions at $\sqrt{s}
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| Release | : 2011 |
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The authors present a new measurement of the production cross section [sigma](pp̄ = ZZ) at a center-of-mass energy √s = 1.96 TeV, obtained from the analysis of the four charged lepton final state l+l-l`+l`- (l, l` = e or [mu]). They observe ten candidate events with an expected background of 0.37 ± 0.13 events. The measured cross section [sigma](pp̄ =ZZ) = 1.26-0.37+0.47 (stat) ± 0.14 (syst) pb is in agreement with NLO QCD predictions. This result is combined with a previous result from the ZZ = l+l- [nu][̄nu] channel resulting in a combined cross section of [sigma](pp̄ = ZZ) = 1.40-0.37+0.43 (stat) ±0.14 (syst) pb.
Measurement of the $ZZ$ Production Cross Section in $pp$ Collisions at $\sqrt{s}$
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| Release | : 2016 |
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The ZZ production cross section in proton-proton collisions at 13 TeV center-of-mass energy is measured using 3.2 fb–1 of data recorded with the ATLAS detector at the Large Hadron Collider. The considered Z boson candidates decay to an electron or muon pair of mass 66–116 GeV. The cross section is measured in a fiducial phase space reflecting the detector acceptance. It is also extrapolated to a total phase space for Z bosons in the same mass range and of all decay modes, giving 16.7+2.2–2.0(stat)+0.9–0.7(syst)+1.0–0.7(lumi) pb. Lastly, the results agree with standard model predictions.
Measurement of Z/gamma*+jet+X Angular Distributions in P Anti-p Collisions at S**1/2
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| Total Pages | : 15 |
| Release | : 2009 |
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We present the first measurements at a hadron collider of differential cross sections for Z/[gamma]* + jet + X production in [Delta][phi](Z, jet),
Measurement of $ZZ$ Production in Leptonic Final States at $\surd{s}$ of 1.96 TeV at CDF.
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| Release | : 2011 |
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In this paper we present a precise measurement of the total ZZ production cross section in p{bar p} collisions at √s = 1.96 TeV, using data collected with the CDF II detector corresponding to an integrated luminosity of approximately 6 fb−1. The result is obtained by combining separate measurements in the four-charged (lll′l′), and two-charged-lepton and two-neutral-lepton (ll??) decay modes of the Z. The combined measured cross section for p{bar p} → ZZ is 1.64{sub -0.38}{sup +0.44} pb. This is the most precise measurement of the ZZ production cross section in 1.96 TeV p{bar p} collisions to date.
Measurement of Sigma P Anti-p --] Z . Br (Z --] 2tau) in P Anti-p Collisions at S**1/2
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| Total Pages | : 24 |
| Release | : 2007 |
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We present a measurement of the inclusive production cross-section for Z bosons decaying to tau leptons in p{bar p} collisions at √s = 1.96 TeV. We use a channel with one hadronically-decaying and one electronically-decaying tau. This measurement is based on 350 pb−1 of CDF Run II data. Using a sample of 504 opposite sign e[tau] events with a total expected background of 190 events, we obtain [sigma](p{bar p} → Z) · [Beta](Z → [tau][tau]) = 263 ± 23(stat) ± 14(syst) ± 15(lumi) pb, in agreement with the next-to-next-to-leading order QCD prediction. This is the first CDF cross section measurement using hadronically-decaying taus in Run II.
