# Z cross-section measurement at √s=7 TeV using the channel Z→ττ

The preprint is available here.

J. High Energy Phys. 01 (2013) 111

arXiv:1210.6289

More detailed information: ANA note 2012-056

## Abstract

A measurement of the inclusive cross-section in collisions at TeV is presented based on a dataset of 1.0 fb collected by the LHCb detector. Candidates for decays are identified through reconstructed final states with two muons, a muon and an electron, a muon and a hadron, or an electron and a hadron. The production cross-section for bosons, with invariant mass between 60 and 120 GeV, which decay to leptons with transverse momenta greater than 20 GeV and pseudorapidities between 2.0 and 4.5, is measured to be pb; the first uncertainty is statistical, the second uncertainty is systematic, and the third is due to the uncertainty on the integrated luminosity. The ratio of the cross-sections for to is determined to be , where the uncertainty is the combination of statistical, systematic, and luminosity uncertainties of the two measurements.

## Figures

Caption Figure
(Fig.1a.eps, Fig.1a.pdf, Fig.1a.png) Invariant mass distributions for the , , , , and candidates with the excluded mass range indicated for . The simulation (solid red) is normalised to the number of signal events. The QCD (horizontal green), electroweak (vertical blue), and (solid cyan) backgrounds are estimated from data. The (vertical orange) and (horizontal magenta) backgrounds are estimated from simulation and generally not visible.
(Fig.1b.eps, Fig.1b.pdf, Fig.1b.png) Invariant mass distributions for the , , , , and candidates with the excluded mass range indicated for . The simulation (solid red) is normalised to the number of signal events. The QCD (horizontal green), electroweak (vertical blue), and (solid cyan) backgrounds are estimated from data. The (vertical orange) and (horizontal magenta) backgrounds are estimated from simulation and generally not visible.
(Fig.1c.eps, Fig.1c.pdf, Fig.1c.png) Invariant mass distributions for the , , , , and candidates with the excluded mass range indicated for . The simulation (solid red) is normalised to the number of signal events. The QCD (horizontal green), electroweak (vertical blue), and (solid cyan) backgrounds are estimated from data. The (vertical orange) and (horizontal magenta) backgrounds are estimated from simulation and generally not visible.
(Fig.1d.eps, Fig.1d.pdf, Fig.1d.png) Invariant mass distributions for the , , , , and candidates with the excluded mass range indicated for . The simulation (solid red) is normalised to the number of signal events. The QCD (horizontal green), electroweak (vertical blue), and (solid cyan) backgrounds are estimated from data. The (vertical orange) and (horizontal magenta) backgrounds are estimated from simulation and generally not visible.
(Fig.1e.eps, Fig.1e.pdf, Fig.1e.png) Invariant mass distributions for the , , , , and candidates with the excluded mass range indicated for . The simulation (solid red) is normalised to the number of signal events. The QCD (horizontal green), electroweak (vertical blue), and (solid cyan) backgrounds are estimated from data. The (vertical orange) and (horizontal magenta) backgrounds are estimated from simulation and generally not visible.
(Fig.2.eps, Fig.2.pdf, Fig.2.png) Measured cross-sections for the decaying to the final states , , , , and (open points) compared with theory (yellow band) and the combined and LHCB measurements (closed points) where and are the transverse momentum and pseudorapidity of the leptons, and is the di-lepton invariant mass. The inner error bars represent combined statistical, systematic, and luminosity uncertainties. The central theory value is given by the light yellow line while the associated uncertainty by the orange band.
Topic attachments
I Attachment History Action Size Date Who Comment
eps Fig.1a.eps r1 manage 215.7 K 2012-10-30 - 14:22 PhilipIlten
pdf Fig.1a.pdf r1 manage 69.7 K 2012-10-30 - 14:23 PhilipIlten
png Fig.1a.png r1 manage 76.4 K 2012-10-30 - 14:23 PhilipIlten
eps Fig.1b.eps r1 manage 203.4 K 2012-10-30 - 14:24 PhilipIlten
pdf Fig.1b.pdf r1 manage 70.0 K 2012-10-30 - 14:24 PhilipIlten
png Fig.1b.png r1 manage 61.8 K 2012-10-30 - 14:24 PhilipIlten
eps Fig.1c.eps r1 manage 182.7 K 2012-10-30 - 14:24 PhilipIlten
pdf Fig.1c.pdf r1 manage 65.9 K 2012-10-30 - 14:24 PhilipIlten
png Fig.1c.png r1 manage 52.6 K 2012-10-30 - 14:24 PhilipIlten
eps Fig.1d.eps r1 manage 191.6 K 2012-10-30 - 14:24 PhilipIlten
pdf Fig.1d.pdf r1 manage 67.4 K 2012-10-30 - 14:25 PhilipIlten
png Fig.1d.png r1 manage 58.6 K 2012-10-30 - 14:25 PhilipIlten
eps Fig.1e.eps r1 manage 189.3 K 2012-10-30 - 14:25 PhilipIlten
pdf Fig.1e.pdf r1 manage 67.6 K 2012-10-30 - 14:25 PhilipIlten
png Fig.1e.png r1 manage 54.7 K 2012-10-30 - 14:25 PhilipIlten
eps Fig.2.eps r1 manage 193.0 K 2012-10-30 - 14:25 PhilipIlten
pdf Fig.2.pdf r1 manage 86.4 K 2012-10-30 - 14:25 PhilipIlten
png Fig.2.png r1 manage 50.3 K 2012-10-30 - 14:25 PhilipIlten
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Topic revision: r4 - 2014-01-17 - KatharinaMueller

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