A measurement of the cross-section for Z-boson production in the forward region of pp collisions at 8TeV centre-of-mass energy is presented. The measurement is based on a sample of $\rm Z\rightarrow e^+e^-$ decays reconstructed using the LHCb detector, corresponding to an integrated luminosity of 2.0fb$^-1$. The acceptance is defined by the requirements $2.0<\eta<4.5$ and $p_\rm T>20$GeV for the pseudorapidities and transverse momenta of the leptons. Their invariant mass is required to lie in the range 60--120GeV. The cross-section is determined to be $$ \sigma(\rm pp\to Z\to e^+e^-)=93.81\pm0.41(\rm stat)\pm1.48(\rm syst)\pm1.14(\rm lumi)\;\rm pb\,,$$ 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 $\phi^*$, which is related to the Z-boson transverse momentum.

Measurement of forward Z → e+e− production at s = 8 $$ \sqrts=8 $$ TeV

SATRIANO, Celestina;
2015-01-01

Abstract

A measurement of the cross-section for Z-boson production in the forward region of pp collisions at 8TeV centre-of-mass energy is presented. The measurement is based on a sample of $\rm Z\rightarrow e^+e^-$ decays reconstructed using the LHCb detector, corresponding to an integrated luminosity of 2.0fb$^-1$. The acceptance is defined by the requirements $2.0<\eta<4.5$ and $p_\rm T>20$GeV for the pseudorapidities and transverse momenta of the leptons. Their invariant mass is required to lie in the range 60--120GeV. The cross-section is determined to be $$ \sigma(\rm pp\to Z\to e^+e^-)=93.81\pm0.41(\rm stat)\pm1.48(\rm syst)\pm1.14(\rm lumi)\;\rm pb\,,$$ 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 $\phi^*$, which is related to the Z-boson transverse momentum.
2015
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11563/112732
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