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Measurement of dijet crosssections in pp collisions at 7 TeV centreofmass energy using the ATLAS detector 

Collaboration  With : Alexandre, Gauthier / Barone, Gaetano / Bell, Paul / Bell, William / Benhar Noccioli, Eleonora / Bilbao De Mendizabal, Javier / Bucci, Francesca / Camacho Toro, Reina / Clark, Allan Geoffrey / Doglioni, Caterina / Ferrere, Didier / Gadomski, Szymon / Gonzalez Sevilla, Sergio / Goulette, Marc / Gramling, Johanna Léna / Guescini, Francesco / Iacobucci, Giuseppe / Katre, Akshay / La Rosa, Alessandro / Martin Dit Latour, Bertrand / Mermod, Philippe / Mora Herrera, Maria Clemencia Rosario / Muenstermann, Daniel / Nektarijevic, Snezana / Nikolics, Katalin / Pásztor, G. / Picazio, Attilio / Pohl, Martin / Rosbach, Kilian / Vallecorsa, Sofia / Wu, Xin  
Published in  Journal of High Energy Physics. 2014, vol. 1405, p. 059126  
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SCOAP3 

Abstract  Doubledifferential dijet crosssections measured in pp collisions at the LHC with a 7 TeV centreofmass energy are presented as functions of dijet mass and half the rapidity separation of the two highest p T jets. These measurements are obtained using data corresponding to an integrated luminosity of 4.5 fb −1 , recorded by the ATLAS detector in 2011. The data are corrected for detector effects so that crosssections are presented at the particle level. Crosssections are measured up to 5 TeV dijet mass using jets reconstructed with the anti k t algorithm for values of the jet radius parameter of 0.4 and 0.6. The crosssections are compared with nexttoleadingorder perturbative QCD calculations by NLOJet++ corrected to account for nonperturbative effects. Comparisons with POWHEG predictions, using a nexttoleadingorder matrix element calculation interfaced to a partonshower Monte Carlo simulation, are also shown. Electroweak effects are accounted for in both cases. The quantitative comparison of data and theoretical predictions obtained using various parameterizations of the parton distribution functions is performed using a frequentist method. In general, good agreement with data is observed for the NLOJet++ theoretical predictions when using the CT10, NNPDF2.1 and MSTW 2008 PDF sets. Disagreement is observed when using the ABM11 and HERAPDF1.5 PDF sets for some ranges of dijet mass and half the rapidity separation. An example setting a lower limit on the compositeness scale for a model of contact interactions is presented, showing that the unfolded results can be used to constrain contributions to dijet production beyond that predicted by the Standard Model.  
Keywords  Jets — Jet physics — HadronHadron Scattering  
Identifiers  arXiv: 1312.3524  
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Citation (ISO format)  ATLAS COLLABORATION. Measurement of dijet crosssections in pp collisions at 7 TeV centreofmass energy using the ATLAS detector. In: Journal of High Energy Physics, 2014, vol. 1405, p. 059126. https://archiveouverte.unige.ch/unige:55803 