Simultaneous Measurements Of The Tt U00af W W And Z U2192 Production Cross Sections In Pp Collisions At S

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Simultaneous Measurements Of The Tt U00af W W And Z U2192 Production Cross Sections In Pp Collisions At S

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Author :
language : en
Publisher:
Release Date : 2015

Simultaneous Measurements Of The Tt U00af W W And Z U2192 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 2015 with categories.

Simultaneous measurements of the tt¯, W+W–, and Z/?*→?? production cross-sections using an integrated luminosity of 4.6 fb–1 of pp collisions at √s=7 TeV collected by the ATLAS detector at the LHC are presented. Events are selected with two high transverse momentum leptons consisting of an oppositely charged electron and muon pair. The three processes are separated using the distributions of the missing transverse momentum of events with zero and greater than zero jet multiplicities. Measurements of the fiducial cross-section are presented along with results that quantify for the first time the underlying correlations in the predicted and measured cross-sections due to proton parton distribution functions. Results indicate that the correlated next-to-leading-order predictions for tt¯ and Z/?*→?? underestimate the data, while those at next-to-next-to-leading-order generally describe the data well. The full cross-sections are measured to be ?(tt¯)=181.2 ± 2.8+9.7–9.5 ± 3.3 ± 3.3 pb, ?(W+W–) = 53.3 ± 2.7+7.3–8.0 ± 1.0 ± 0.5 pb, and ?(Z/?*→??) = 1174 ± 24+72–87 ± 21 ± 9 pb, where the cited uncertainties are due to statistics, systematic effects, luminosity and the LHC beam energy measurement, respectively. The W+W– measurement includes the small contribution from Higgs boson decays, H → W+W–.

Measurement Of The Tt Ww And Z Tautau Production Cross Sections In P Anti P Collisions At S 1 2

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Author : Sebastian Carron Montero
language : en
Publisher:
Release Date : 2006

Measurement Of The Tt Ww And Z Tautau Production Cross Sections In P Anti P Collisions At S 1 2 written by Sebastian Carron Montero and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with categories.

In this thesis we present a new technique to analyze events containing two highly energetic leptons, as a probe of the Standard Model. The philosophy is to consider the data in a more global way, as opposed to the more traditional process dependent approach of extracting a given signal over the expected backgrounds by using various kinematical requirements. We use our global technique to simultaneously measure the cross sections of the main Standard Model processes; the t{bar t}, WW and Z → [tau][tau] production from p{bar p} collisions at √s = 1.96 TeV in the CDF detector at Fermilab. We select events by requiring they contain two highly energetic leptons (e[mu], ee, or [mu][mu]), and make no other kinematic requirements, except for the ee and [mu][mu] channels. We then use a likelihood fit of the data in the two-dimensional phase space defined by the missing transverse energy (E{sub T}) and the number of jets in the event (N{sub jet}), to the expected Standard Model distributions, to simultaneously extract the production cross-sections of the main process contributing to our dilepton sample.

Measurement Of The Tt Ww And Z Tau Tau Production Cross Sections In Pp Collisions At Square Root Of S

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Author : Sebastian Carron Montero
language : en
Publisher:
Release Date : 2006

Measurement Of The Tt Ww And Z Tau Tau Production Cross Sections In Pp Collisions At Square Root Of S written by Sebastian Carron Montero and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2006 with Cross sections (Nuclear physics) categories.

Measurement Of The Zz Production Cross Section In Pp U00af Collisions At S

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Author :
language : en
Publisher:
Release Date : 2011

Measurement Of The Zz Production Cross Section In Pp U00af 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 2011 with categories.

The authors present a new measurement of the production cross section ?(pp = 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 ?). They observe ten candidate events with an expected background of 0.37 ± 0.13 events. The measured cross section ?(pp =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- ?? channel resulting in a combined cross section of ?(pp = ZZ) = 1.40-0.37-0.43 (stat) ±0.14 (syst) pb.

Measurements Of Normalized Differential Cross Sections For Tt U00af Production In Pp Collisions At S

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Author :
language : en
Publisher:
Release Date : 2014

Measurements Of Normalized Differential Cross Sections For Tt U00af Production 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 2014 with categories.

We present measurements of normalized differential cross sections for top-quark pair production as a function of the top-quark transverse momentum, and of the mass, transverse momentum, and rapidity of the t¯t system, in proton–proton collisions at a center-of-mass energy of √ s=7 TeV. The data set corresponds to an integrated luminosity of 4.6 fb−1, recorded in 2011 with the ATLAS detector at the CERN Large Hadron Collider. Events are selected in the lepton + jets channel, requiring exactly one lepton and at least four jets with at least one of the jets tagged as originating from a b-quark. The measured spectra are corrected for detector efficiency and resolution effects and are compared to several Monte Carlo simulations and theory calculations. The results are in fair agreement with the predictions in a wide kinematic range. Nevertheless, data distributions are softer than predicted for higher values of the mass of the t¯t system and of the top-quark transverse momentum. Lastly, the measurements can also discriminate among different sets of parton distribution functions.

Measurement Of The Inclusive W And Z Production Cross Sections In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2011

Measurement Of The Inclusive W And Z Production Cross Sections 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 2011 with categories.

A measurement of inclusive W and Z production cross sections in pp collisions at sqrt(s)=7 TeV is presented. The electron and muon decay channels are analyzed in a data sample collected with the CMS detector at the LHC and corresponding to an integrated luminosity of 36 inverse picobarns. The measured inclusive cross sections are sigma(pp-> WX) B(W-> l nu) = 10.30 +/- 0.02 (stat.) +/- 0.10 (syst.) +/- 0.10 (th.) +/- 0.41 (lumi.) nb and sigma(pp -> ZX) B(Z-> l+̂l-̂) = 0.974 +/- 0.007 (stat.) +/- 0.007 (syst.) +/- 0.018 (th.) +/- 0.039 (lumi.) nb, limited to the dilepton invariant mass range 60 to 120 GeV. The luminosity-independent cross section ratios are [sigma(pp->WX) B(W-> l nu)]/[sigma(pp-> ZX) B(Z->l+̂l-̂)] = 10.54 +/- 0.07 (stat.) +/- 0.08 (syst.) +/- 0.16 (th.) and [sigma(pp->W+̂X) B(W+̂ -> l+̂nu)] / [sigma(pp->W-̂ X) B(W-̂ -> l-̂ nu)] = 1.421 +/- 0.006 (stat.) +/- 0.014 (syst.) +/- 0.029 (th.). The measured values agree with next-to-next-to-leading order QCD cross section calculations based on recent parton distribution functions.

Measurements Of Inclusive W And Z Cross Sections In Pp Collisions At Sqrt S

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Author :
language : en
Publisher:
Release Date : 2011

Measurements Of Inclusive W And Z Cross Sections 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 2011 with categories.

Measurements of inclusive W and Z boson production cross sections in pp collisions at sqrt(s)=7 TeV are presented, based on 2.9 inverse picobarns of data recorded by the CMS detector at the LHC. The measurements, performed in the electron and muon decay channels, are combined to give sigma(pp to WX) times B(W to muon or electron + neutrino) = 9.95 \pm 0.07(stat.) \pm 0.28(syst.) \pm 1.09(lumi.) nb and sigma(pp to ZX) times B(Z to oppositely charged muon or electron pairs) = 0.931 \pm 0.026(stat.) \pm 0.023(syst.) \pm 0.102(lumi.) nb. Theoretical predictions, calculated at the next-to-next-to-leading order in QCD using recent parton distribution functions, are in agreement with the measured cross sections. Ratios of cross sections, which incur an experimental systematic uncertainty of less than 4%, are also reported.

Measurement Of W And Z Boson Production Cross Sections In Pp Collisions At Mml

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Author :
language : en
Publisher:
Release Date : 2016

Measurement Of W And Z Boson Production Cross Sections In Pp Collisions At Mml 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.

Measurements of the W± → l±[nu] and Z → l+l- production cross sections (where l± = e±, [mu]± ) in proton-proton collisions at √s = 13 TeV are presented using data recorded by the ATLAS experiment at the Large Hadron Collider, corresponding to a total integrated luminosity of 81 pb-1. The total inclusive W±-boson production cross sections times the single-lepton-flavour branching ratios are [sigma]Wtot+ =11.83 ± 0.02 (stat)±0.32 (sys)±0.25 (lumi) nb and [sigma]W-tot=8.79±0.02 (stat)±0.24 (sys)±0.18 (lumi) nb for W+ and W- , respectively.

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 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.