Measurement of forward $\rm Z\rightarrow e^+e^-$ production at $\sqrt{s}=8$ TeV - INSPIRE

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Measurement of forward $\rm Z\rightarrow e^+e^-$ production at $\sqrt{s}=8$ TeV

LHCb

Collaboration

Mar 3, 2015

25 pages

Published in:

JHEP 05 (2015) 109

Published: May 21, 2015

e-Print:

1503.00963 [hep-ex]

DOI:

10.1007/JHEP05(2015)109

Report number:

CERN-PH-EP-2015-045,
LHCB-PAPER-2015-003

Experiments:

CERN-LHC-LHCb

View in:

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Abstract: (Springer)

A measurement of the cross-section for Z-boson production in the forward region of pp collisions at 8 TeV centre-of-mass energy is presented. The measurement is based on a sample of Z → e

^{+}

e

^{−}

decays reconstructed using the LHCb detector, corresponding to an integrated luminosity of 2.0 fb

^{−1}

. The acceptance is defined by the requirements 2.0 < η < 4.5 and p

_{T}

> 20 GeV for the pseudorapidities and transverse momenta of the leptons. Their invariant mass is required to lie in the range 60-120 GeV. The cross-section is determined to be

\sigma \left(\mathrm{pp}\to \mathrm{Z}\to {\mathrm{e}}^{+}{\mathrm{e}}^{-}\right)=93.81\pm 0.41\left(\mathrm{stat}\right)\pm 1.48\left(\mathrm{syst}\right)\pm 1.14\left(\mathrm{lumi}\right)\mathrm{p}\mathrm{b},

where the first uncertainty is statistical and the second reflects all systematic effects apart from that arising from the luminosity, which is given as the third uncertainty. Differential cross-sections are presented as functions of the Z-boson rapidity and of the angular variable ϕ

^{∗}

, which is related to the Z-boson transverse momentum.

Electroweak interaction
QCD
Forward physics
Hadron-Hadron Scattering
proton-proton scattering
p p: colliding beams
Z0: transverse momentum
Z0: hadroproduction
Z0: leptonic decay
lepton: transverse momentum

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