Measurements of the electron and muon inclusive cross-sections in proton–proton collisions at $\sqrt{s}$ = 7 TeV with the ATLAS detector

On Behalf Of The Atlas Collaboration ,Moritz Backes

doi:10.1007/s12043-012-0378-2

Abstract

We present the measurements of the differential cross-sections for inclusive electron and muon production in proton–proton collisions at a centre-of-mass energy of $\sqrt{s} = $ 7 TeV, using ∼1.4 pb − 1 of data collected by the ATLAS detector at the Large Hadron Collider. The muon cross-section is measured as a function of muon transverse momentum p T in the range 4 < p T < 100 GeV and within pseudorapidity |η| < 2.5. In addition, the electron and muon cross-sections are measured in the range 7 < p T < 26 GeV and within |η| < 2.0, excluding 1.37 < |η| < 1.52. After subtraction of the W/Z/γ ∗ contribution, the differential cross-sections are found to be in good agreement with theoretical predictions for heavy-flavour production obtained from fixed order NLO calculations with NLL high-p T resummation, and to be sensitive to the effects of NLL resummation.

Highlights

The inclusive production of electrons and muons is dominated by decays of charm and beauty hadrons after subtraction of the W/Z /γ ∗ components and may be used to constrain theoretical predictions for heavy-flavour (HF) production
We present the measurements of the differential cross-sections for√inclusive electron and muon production in proton–proton collisions at a centre-of-mass energy of s = 7 TeV, using ∼1.4 pb−1 of data collected by the ATLAS detector at the Large Hadron Collider
The overall systematic uncertainty of the electron measurement is dominated by the uncertainties of the signal-extraction method and the material uncertainty in the detector volume upstream of the ECAL

Summary

Introduction

The inclusive production of electrons and muons is dominated by decays of charm and beauty hadrons after subtraction of the W/Z /γ ∗ components and may be used to constrain theoretical predictions for heavy-flavour (HF) production. In this analysis [1], the inclusive muon cross-section is measured as a function of muon transverse momentum pT in the range 4 < pT < 100 GeV and within pseudorapidity |η| < 2.5. The main components of the ATLAS detector [2] are the inner detector (ID), the electromagnetic (ECAL) and hadronic calorimeters, and the muon spectrometer (MS). Cmigrationi is the bin-migration correction factor, defined as the ratio of the number of charged leptons in bin i of true pT and the number in the same bin of reconstructed pT

Signal selection and efficiency determination

Findings

Conclusion