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 pp̄ collisions at √s
Title | 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 pp̄ collisions at √s PDF eBook |
Author | Mika Vesterinen |
Publisher | |
Pages | 0 |
Release | 2012 |
Genre | |
ISBN |
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 $sqrt{s}$
Title | 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 $sqrt{s}$ PDF eBook |
Author | Mika Vesterinen |
Publisher | |
Pages | 264 |
Release | 2011 |
Genre | |
ISBN |
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 $\sqrt{s}$
Title | 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 $\sqrt{s}$ PDF eBook |
Author | |
Publisher | |
Pages | 264 |
Release | 2011 |
Genre | |
ISBN |
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 Boson Differential Cross Section in Transverse Momentum and Rapidity in Proton-proton Collisions at 8 TeV.
Title | Measurement of the Z Boson Differential Cross Section in Transverse Momentum and Rapidity in Proton-proton Collisions at 8 TeV. PDF eBook |
Author | |
Publisher | |
Pages | 23 |
Release | 2015 |
Genre | |
ISBN |
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.
Measurement of the Production Cross Sections for a Z Boson and One Or More B Jets in Pp Collisions at Sqrt(s)
Title | Measurement of the Production Cross Sections for a Z Boson and One Or More B Jets in Pp Collisions at Sqrt(s) PDF eBook |
Author | |
Publisher | |
Pages | 39 |
Release | 2014 |
Genre | |
ISBN |
The production of a Z boson, decaying into two leptons and produced in association with one or more b jets, is studied using proton-proton collisions delivered by the LHC at a centre-of-mass energy of 7 TeV. The data were recorded in 2011 with the CMS detector and correspond to an integrated luminosity of 5 fb-1. The Z(ll) + b-jets cross sections (where ll = [mu][mu] or ee) are measured separately for a Z boson produced with exactly one b jet and with at least two b jets. In addition, a cross section ratio is extracted for a Z boson produced with at least one b jet, relative to a Z boson produced with at least one jet. The measured cross sections are compared to various theoretical predictions, and the data favour the predictions in the five-flavour scheme, where b quarks are assumed massless. The kinematic properties of the reconstructed particles are compared with the predictions from the MadGraph event generator using the pythia parton shower simulation.
Measurement of the W and Z Boson Production Cross Sections in P, P̄ Collisions at [square Root Sign]s
Title | Measurement of the W and Z Boson Production Cross Sections in P, P̄ Collisions at [square Root Sign]s PDF eBook |
Author | Peter Matthew Grudberg |
Publisher | |
Pages | 400 |
Release | 1997 |
Genre | |
ISBN |
Measurement of the $ZZ$ Production Cross Section in $pp$ Collisions at $\sqrt{s}$
Title | Measurement of the $ZZ$ Production Cross Section in $pp$ Collisions at $\sqrt{s}$ PDF eBook |
Author | |
Publisher | |
Pages | |
Release | 2016 |
Genre | |
ISBN |
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.