Abstract
High transverse momentum jets produced in pp collisions at a centre of mass energy of 7 TeV are used to measure the transverse energy–energy correlation function and its associated azimuthal asymmetry. The data were recorded with the ATLAS detector at the LHC in the year 2011 and correspond to an integrated luminosity of 158 pb−1. The selection criteria demand the average transverse momentum of the two leading jets in an event to be larger than 250 GeV. The data at detector level are well described by Monte Carlo event generators. They are unfolded to the particle level and compared with theoretical calculations at next-to-leading-order accuracy. The agreement between data and theory is good and provides a precision test of perturbative Quantum Chromodynamics at large momentum transfers. From this comparison, the strong coupling constant given at the Z boson mass is determined to be αs(mZ)=0.1173±0.0010 (exp.) −0.0026+0.0065 (theo.).
Highlights
The study of jet production at the LHC provides a quantitative test of Quantum Chromodynamics, QCD, at the highest momentum transfers
First measurements of the TEEC and asymmetry of the TEEC (ATEEC) functions are presented using 158 pb−1 of pp collision data at 7 TeV recorded by the ATLAS experiment at the LHC
The TEEC and ATEEC data are fairly well described by Pythia 6 and Alpgen, while the Herwig++ Monte Carlo (MC) simulation shows some discrepancies which can be as large as 30%
Summary
The study of jet production at the LHC provides a quantitative test of Quantum Chromodynamics, QCD, at the highest momentum transfers. The EEC function and its asymmetry, AEEC, were subsequently calculated in O(α2s ) [20,21,22], and their measurements [23,24,25,26,27,28,29,30,31,32,33,34,35] have had significant impact on the precision tests of perturbative QCD and in the determination of the strong coupling constant in e+e− annihilation experiments; a recent review is given in Ref. [2, 3] These calculations allow for a numerical determination of the NLO predictions for the TEEC and ATEEC, i.e. the coefficients of the second order polynomials in the strong coupling constant. This Letter presents a measurement of the TEEC and its associated asymmetry using high-energy jets
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