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Aad, G.,Abajyan, T.,Abbott, B.,Abdallah, J.,Abdel Khalek, S.,Abdelalim, A. A.,Abdinov, O.,Aben, R.,Abi, B.,Abolins, M.,AbouZeid, O. S.,Abramowicz, H.,Abreu, H.,Acharya, B. S.,Adamczyk, L.,Adams, D. L. Springer 2013 European Physical Journal C Vol.73 No.8
<P>The inclusive jet cross-section has been measured in proton–proton collisions at [FORMULA OMISSION] in a dataset corresponding to an integrated luminosity of [FORMULA OMISSION] collected with the ATLAS detector at the Large Hadron Collider in 2011. Jets are identified using the anti-<I>k</I><SUB><I>t</I></SUB> algorithm with two radius parameters of 0.4 and 0.6. The inclusive jet double-differential cross-section is presented as a function of the jet transverse momentum <I>p</I><SUB>T</SUB> and jet rapidity <I>y</I>, covering a range of 20≤<I>p</I><SUB>T</SUB><430 GeV and |<I>y</I>|<4.4. The ratio of the cross-section to the inclusive jet cross-section measurement at [FORMULA OMISSION], published by the ATLAS Collaboration, is calculated as a function of both transverse momentum and the dimensionless quantity [FORMULA OMISSION], in bins of jet rapidity. The systematic uncertainties on the ratios are significantly reduced due to the cancellation of correlated uncertainties in the two measurements. Results are compared to the prediction from next-to-leading order perturbative QCD calculations corrected for non-perturbative effects, and next-to-leading order Monte Carlo simulation. Furthermore, the ATLAS jet cross-section measurements at [FORMULA OMISSION] and [FORMULA OMISSION] are analysed within a framework of next-to-leading order perturbative QCD calculations to determine parton distribution functions of the proton, taking into account the correlations between the measurements.</P>
Aad, G.,Abajyan, T.,Abbott, B.,Abdallah, J.,Abdel Khalek, S.,Abdelalim, A. A.,Abdinov, O.,Aben, R.,Abi, B.,Abolins, M.,AbouZeid, O. S.,Abramowicz, H.,Abreu, H.,Acharya, B. S.,Adamczyk, L.,Adams, D. L. Springer-Verlag 2013 European Physical Journal C Vol.73 No.3
<P>A measurement of the top quark pair production cross section in the final state with a hadronically decaying tau lepton and jets is presented. The analysis is based on proton–proton collision data recorded by the ATLAS experiment at the LHC, with a centre-of-mass energy of 7 TeV. The data sample corresponds to an integrated luminosity of 1.67 fb<SUP>−1</SUP>. The cross section is measured to be [FORMULA OMISSION] and is in agreement with other measurements and with the Standard Model prediction.</P>
Aad, G.,Abajyan, T.,Abbott, B.,Abdallah, J.,Khalek, S. Abdel,Abdinov, O.,Aben, R.,Abi, B.,Abolins, M.,AbouZeid, O. S.,Abramowicz, H.,Abreu, H.,Abulaiti, Y.,Acharya, B. S.,Adamczyk, L.,Adams, D. L.,Add Springer Berlin Heidelberg 2014 The European physical journal. C, Particles and fi Vol.74 No.7
<P>Many of the interesting physics processes to be measured at the LHC have a signature involving one or more isolated electrons. The electron reconstruction and identification efficiencies of the ATLAS detector at the LHC have been evaluated using proton–proton collision data collected in 2011 at [FORMULA OMISSION] TeV and corresponding to an integrated luminosity of 4.7 fb[FORMULA OMISSION]. Tag-and-probe methods using events with leptonic decays of [FORMULA OMISSION] and [FORMULA OMISSION] bosons and [FORMULA OMISSION] mesons are employed to benchmark these performance parameters. The combination of all measurements results in identification efficiencies determined with an accuracy at the few per mil level for electron transverse energy greater than 30 GeV.</P>