Measurement of Dijet Cross Sections in Proton-proton Collisions at 7 TeV Center-of-mass Energy Using the ATLAS Detector
Author | : |
Publisher | : |
Total Pages | : 141 |
Release | : 2013 |
ISBN-10 | : 1303634562 |
ISBN-13 | : 9781303634567 |
Rating | : 4/5 (62 Downloads) |
Download or read book Measurement of Dijet Cross Sections in Proton-proton Collisions at 7 TeV Center-of-mass Energy Using the ATLAS Detector written by and published by . This book was released on 2013 with total page 141 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dijet production is measured in proton--proton collisions with a center-of-mass energy of 7 TeV at the LHC. Double-differential dijet cross sections are presented as functions of the dijet mass and rapidity separation of the two highest-transverse-momentum jets in an event. The data sample collected in 2011 by the ATLAS detector is considered, corresponding to an integrated luminosity of 4.5 fb -1. Jets are defined using the anti-kt algorithm, with two choices of the jet radius parameter, R = 0.4 and R = 0.6. The results are compared with next-to-leading-order (NLO) perturbative calculations, as well as NLO Monte Carlo generator predictions. In both cases, electroweak effects are accounted for. A method for the quantitative comparison of theory predictions with data is presented, employing a frequentist technique. This allows for strong statements on which sets of parton distribution functions best describe the data. A theory of quark compositeness modeled by contact interactions is confronted by the unfolded data using the CLs technique, an example of the versatility of the measurement.