Measurements Of The Zz Production Cross Sections In The 2 Ell2 Nu Channel In Proton Proton Collisions At Sqrt S
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Measurements Of The Zz Production Cross Sections In The 2 Ell2 Nu Channel In Proton Proton Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2015
Measurements Of The Zz Production Cross Sections In The 2 Ell2 Nu Channel In Proton Proton Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2015 with categories.
Measurements of the ZZ production cross sections in proton-proton collisions at center-of-mass energies of 7 and 8 TeV are presented. We found that candidate events for the leptonic decay mode ZZ 2!2l2[nu], where l denotes an electron or a muon, are reconstructed and selected from data corresponding to an integrated luminosity of 5.1 (19.6)fb-1 at 7 (8) TeV collected with the CMS experiment. The measured cross sections, [sigma](pp 2!ZZ)=5.1+1.5-1.4(stat)+1.4-1.1(syst)"0.1(lumi)pb at 7 TeV, and 7.2+0.8-0.8(stat)+1.9-1.5(syst)"0.2(lumi)pb at 8 TeV, are in good agreement with the standard model predictions with next-to-leading-order accuracy. Furthermore, the selected data are analyzed to search for anomalous triple gauge couplings involving the ZZ final state. In the absence of any deviation from the standard model predictions, limits are set on the relevant parameters. As a result, these limits are then combined with the previously published CMS results for ZZ in 4l final states, yielding the most stringent constraints on the anomalous couplings.
Measurement Of W And Z Boson Production Cross Sections In Proton Proton Collisions At Square Root S
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Author : Stephanie Akemi Brandt
language : en
Publisher:
Release Date : 2020
Measurement Of W And Z Boson Production Cross Sections In Proton Proton Collisions At Square Root S written by Stephanie Akemi Brandt and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020 with categories.
Measurements of W and Z boson production cross sections in pp collisions at [square root] s = 5.02TeV and [square root] s = 13TeV are presented. Data was collected by the CMS experiment at the LHC during low-pileup data taking periods in 2017. The corresponding integrated luminosity for the data is 299.1 ± 5 pb−1 ( [square root] s = 5.02TeV) and 199.3 ± 4 pb−1 ( [square root] s = 13TeV), with an average number of pile-up interactions [[mu] = 3 ([mu] = 2). Cross sections and cross section ratios are reported, with final states in electron and muon channels.
Measurement Of Wz And Zz Production In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of Wz And Zz Production In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014 with categories.
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 And Z To Ell Ell Ell Prime Ell Prime Branching Fraction In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The Zz Production Cross Section And Z To Ell Ell Ell Prime Ell Prime Branching Fraction In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
Four-lepton production in proton-proton collisions, pp to (Z/gamma*)(Z/gamma*) to l+l-l'+l'-, where $l, l' = e or mu, 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 inverse femtobarns. The ZZ production cross section, sigma(pp to ZZ) = 14.6 +1.9/-1.8 (stat) +0.5/-0.3 (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 60 m[l+l-], m[l'+l'-]
Measurement Of The Zz Production Cross Section In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The Zz Production Cross Section In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
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 The Zz Production Cross Section In P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
Measurement Of The Zz Production Cross Section In P Bar P Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2011 with categories.
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 And Z U2192 L L U2013 L L U2013 Branching Fraction In Pp Collisions At
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The Zz Production Cross Section And Z U2192 L L U2013 L L U2013 Branching Fraction In Pp Collisions At written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
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 The Z Tau Tau Production Cross Section In Proton Proton Collisions At Square Root Of S
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Author : Justin Griffiths
language : en
Publisher:
Release Date : 2012
Measurement Of The Z Tau Tau Production Cross Section In Proton Proton Collisions At Square Root Of S written by Justin Griffiths and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with Large Hadron Collider (France and Switzerland) categories.
The first measurement of the inclusive cross-section of the Z boson decaying to two tau leptons was measured with the ATLAS detector at the LHC. The data sample in this analysis represents an integrated luminosity of 35 pb ̄1 of proton-proton collisions at a center of mass energy of sqrt(s)=7 TeV. Separate measurements were performed in four decay modes based on how the two tau leptons decay: to hadrons and an electron, to hadrons and a muon, to an electron and a muon, and to two muons. In all four final states, inclusive cross-section measurements were made both in the fiducial region of the ATLAS detector where acceptance is high and in the full phase space, restricted to the mass range of [66, 116] GeV. The measurements from the four individual channels were then combined to yield the combined Z --> [tau] [tau] cross-section of 970 ± 70 (stat.) ± 60 (sys.) ± 30 (lumi.) pb.
Measurement Of The Wz Production Cross Section In Pp Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2016
Measurement Of The Wz Production Cross Section In Pp Collisions At Sqrt S written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2016 with categories.
The WZ production cross section in proton-proton collisions at sqrt(s) = 13 TeV is measured with the CMS experiment at the LHC using a data sample corresponding to an integrated luminosity of 2.3 inverse femtobarns. The measurement is performed in the leptonic decay modes WZ to l nu l' l', where l, l'= e, mu. The measured cross section for the range 60
Zz Production In Proton Proton Collisions At Squareroot Of S
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Author : Nathaniel Bowen Spurgeon Woods
language : en
Publisher:
Release Date : 2017
Zz Production In Proton Proton Collisions At Squareroot Of S written by Nathaniel Bowen Spurgeon Woods and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017 with categories.
Several studies of four-lepton production in proton-proton collisions are presented. The dataset used corresponds to an integrated luminosity 35.9 fb[superscript -1] at a center-of-mass energy of 13 TeV, collected by the CMS detector at the LHC. All reported measurements use the 2[l]2[l]ʹ final states, where [l], [l]ʹ = e or [mu]. The total ZZ cross section for all events with two Z bosons in the mass range 60-120 GeV is measured and found to be [sigma](pp 2!ZZ) = 17.2[+/-]0.5 (stat)[+/-]0.7 (syst)[+/-]0.4 (theo)[+/-]0.4 (lumi) pb. The Z branching fraction to four leptons is found to be [B] (Z [right arrow] 4[l]) = 4.8[+/-]0.2 (stat)[+/-] 0.2 (syst)[+/-]0.1 (theo)[+/-]0.1 (lumi)×10[superscript -6] for events with 80 m 4[subscript [l][l]]