A Measurement Of The Z Boson Transverse Momentum Distribution And Of The Zz And Wz Production Cross Sections Using 7 3 8 6 Fb 1 Of Pp Collisions At S
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Z Boson Transverse Momentum Distribution And Zz And Wz Production
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Author : Mika Vesterinen
language : en
Publisher: Springer Science & Business Media
Release Date : 2012-06-30
Z Boson Transverse Momentum Distribution And Zz And Wz Production written by Mika Vesterinen and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012-06-30 with Science categories.
This work develops novel data analysis techniques enabling aspects of the Standard Model of particle physics to be tested with unprecedented precision using data from the DZero experiment at the high energy “Tevatron” proton-antiproton collider at Fermilab, Chicago. Vesterinen's measurements of the transverse momentum of Z bosons using the novel variable φ* have exposed deficiencies in the current state-of-the-art theoretical predictions for vector boson production at hadron colliders. These techniques are now being used in the experiments at CERN’s Large Hadron Collider (LHC) and have stimulated considerable interest in the theoretical particle physics community. Furthermore, Vesterinen's measurements of the cross sections for the production of pairs of vector bosons (WZ and ZZ) are to date the most precise ever made.
A Measurement Of The Z Boson Transverse Momentum Distribution And Of The Zz And Wz Production Cross Sections Using 7 3 8 6 Fb 1 Of Pp Collisions At S
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Author : Mika Vesterinen
language : en
Publisher:
Release Date : 2012
A Measurement Of The Z Boson Transverse Momentum Distribution And Of The Zz And Wz Production Cross Sections Using 7 3 8 6 Fb 1 Of Pp Collisions At S written by Mika Vesterinen and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2012 with categories.
A Measurement Of The Z Boson Transverse Momentum Distribution And Of The Zz And Wz Production Cross Sections Using 7 3 8 6 Fb 1 Of P Bar P Collisions At Sqrt S
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Author : Mika Vesterinen
language : en
Publisher:
Release Date : 2011
A Measurement Of The Z Boson Transverse Momentum Distribution And Of The Zz And Wz Production Cross Sections Using 7 3 8 6 Fb 1 Of P Bar P Collisions At Sqrt S written by Mika Vesterinen 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.
A Measurement Of The Z Boson Transverse Momentum Distribution And Of The Zz And Wz Production Cross Sections Using 7 3 8 6 Fb 1 Of P Bar P Collisions At Sqrt S
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Author :
language : en
Publisher:
Release Date : 2011
A Measurement Of The Z Boson Transverse Momentum Distribution And Of The Zz And Wz Production Cross Sections Using 7 3 8 6 Fb 1 Of 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.
Two analyses are performed with the large samples of dielectron and dimuon events collected by the D0 experiment at the Fermilab Tevatron $p\bar{p}$ collider. The dilepton transverse momentum ($p_T$) distribution in $Z/\gamma^* → \ell^+\ell^-$ production is a powerful probe of Quantum chromodynamics. Until now, this distribution has been measured with limited precision. An alternative variable, $\phi^*_\eta$, is proposed due to its relatively low susceptibility to detector effects. The $\phi^*_\eta$, distribution of events with $Z/\gamma^* → \ell^+\ell^-$ invariant masses between 70 and 110 GeV, is measured in three bins of dilepton rapidity. This measurement, with 7.3 fb$^{-1}$ of data, is significantly more precise than previous measurements of the $p_T$ distribution. A state-of-the-art QCD Monte Carlo program is in modest agreement with the data. Using 8.6 fb$^{-1}$ of data, the $ZZ/\gamma^* → \nu\bar{\nu}\ell^+\ell^-$ and $WZ/\gamma^* → \ell\nu\ell^+\ell^-$ processes are studied, yielding production cross sections of, $\sigma(p\bar{p} \rightarrow ZZ/\gamma^*)$ = 1.64 $\pm$ 0.46 p b and $\sigma(p\bar{p} \rightarrow WZ/\gamma^*)$ = 4.46 $\pm$ 0.64 pb, for $Z/\gamma^* → \ell^+\ell^-$ invariant masses between 60 and 130 GeV. These are in agreement with Standard Model predictions.
Measurement Of The Z Production Cross Section In Pp Collisions At 8 Tev And Search For Anomalous Triple Gauge Boson Couplings
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of The Z Production Cross Section In Pp Collisions At 8 Tev And Search For Anomalous Triple Gauge Boson Couplings 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.
The cross section for the production of Z? in proton-proton collisions at 8 TeV is measured based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 19.5 fb-1. Events with an oppositely-charged pair of muons or electrons together with an isolated photon are selected. Furthermore, the differential cross section as a function of the photon transverse momentum is measured inclusively and exclusively, where the exclusive selection applies a veto on central jets. These observed cross sections are compatible with the expectations of next-to-next-to-leading-order quantum chromodynamics. As a result, limits on anomalous triple gauge couplings of ZZ? and Z?? are set that improve on previous experimental results obtained with the charged lepton decay modes of the Z boson.
Measurement Of The Z Boson Differential Cross Section In Transverse Momentum And Rapidity In Proton Proton Collisions At 8 Tev
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Author :
language : en
Publisher:
Release Date : 2015
Measurement Of The Z Boson Differential Cross Section In Transverse Momentum And Rapidity In Proton Proton Collisions At 8 Tev 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.
We present a measurement of the Z boson differential cross section in rapidity and transverse momentum using a data sample of pp collision events at a centre-of-mass energy √s=8 TeV, corresponding to an integrated luminosity of 19.7 fb-1. The Z boson is identified via its decay to a pair of muons. The measurement provides a precision test of quantum chromodynamics over a large region of phase space. In addition, due to the small experimental uncertainties in the measurement the data has the potential to constrain the gluon parton distribution function in the kinematic regime important for Higgs boson production via gluon fusion. The results agree with the next-to-next-to-leading-order predictions computed with the fewz program. The results are also compared to the commonly used leading-order MadGraph and next-to-leading-order powheg generators.
Measurements Of W Z Production Cross Sections In Pp Collisions At S
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Author :
language : en
Publisher:
Release Date : 2016
Measurements Of W Z Production Cross Sections In Pp Collisions At 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.
This study presents measurements of W±Z production in pp collisions at a center-of-mass energy of 8 TeV. The gauge bosons are reconstructed using their leptonic decay modes into electrons and muons. The data were collected in 2012 by the ATLAS experiment at the Large Hadron Collider and correspond to an integrated luminosity of 20.3 fb-1. The measured inclusive cross section in the detector fiducial region is ?W±Z→l'?ll = 35.1 ± 0.9(stat) ± 0.8(sys) ± 0.8(lumi) fb, for one leptonic decay channel. In comparison, the next-to-leading-order Standard Model expectation is 30.0 ± 2.1 fb. Cross sections for W+Z and W-Z production and their ratio are presented as well as differential cross sections for several kinematic observables. Limits on anomalous triple gauge boson couplings are derived from the transverse mass spectrum of the W±Z system. From the analysis of events with a W and a Z boson associated with two or more forward jets an upper limit at 95% confidence level on the W±Z scattering cross section of 0.63 fb, for each leptonic decay channel, is established, while the Standard Model prediction at next-to-leading order is 0.13 ± 0.01 fb. Limits on anomalous quartic gauge boson couplings are also extracted.
Measurement Of Differential Production Cross Sections For A Z Boson In Association With B Jets In 7 Tev Proton Proton Collisions With The Atlas Detector
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Author :
language : en
Publisher:
Release Date : 2014
Measurement Of Differential Production Cross Sections For A Z Boson In Association With B Jets In 7 Tev Proton Proton Collisions With The Atlas Detector 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.
We report measurements of differential production cross-sections of a Z boson in association with b-jets in pp collisions at √ s = 7 TeV. The data analysed correspond to an integrated luminosity of 4.6 fb-1 recorded with the ATLAS detector at the Large Hadron Collider. Particle-level cross-sections are determined for events with a Z boson decaying into an electron or muon pair, and containing b-jets. For events with at least one b-jet, the cross-section is presented as a function of the Z boson transverse momentum and rapidity, together with the inclusive b-jet cross-section as a function of b-jet transverse momentum, rapidity and angular separations between the b-jet and the Z boson. For events with at least two b-jets, the cross-section is determined as a function of the invariant mass and angular separation of the two highest transverse momentum b-jets, and as a function of the Z boson transverse momentum and rapidity. Lastly, results are compared to leading-order and next-to-leading-order perturbative QCD calculations.
A Measurement Of The Ratio Of The Production Cross Sections For W And Z Bosons In Association With Jets With The Atlas Detector
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Author :
language : en
Publisher:
Release Date : 2014
A Measurement Of The Ratio Of The Production Cross Sections For W And Z Bosons In Association With Jets With The Atlas Detector 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.
In this study, the ratio of the production cross sections for W and Z bosons in association with jets has been measured in proton-proton collisions at √s = 7 TeV with the ATLAS experiment at the Large Hadron Collider. The measurement is based on the entire 2011 dataset, corresponding to an integrated luminosity of 4.6 fb-1. Inclusive and differential cross-section ratios for massive vector bosons decaying to electrons and muons are measured in association with jets with transverse momentum pT > 30 GeV and jet rapidity.
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 is measured by the CMS experiment at the CERN LHC in proton-proton collision data samples corresponding to integrated luminosities of 4.9 fb$^{-1}$ collected at $ \sqrt{s} = $ 7 TeV, and 19.6 fb$^{-1}$ at $ \sqrt{s} = $ 8 TeV. The measurements are performed using the fully-leptonic WZ decay modes with electrons and muons in the final state. The measured cross sections for 71 $