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Measurement of dijet cross-sections in pp collisions at 7 TeV centre-of-mass energy using the ATLAS detector
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.
KTH, Skolan för teknikvetenskap (SCI), Fysik, Partikel- och astropartikelfysik.ORCID-id: 0000-0003-3867-0336
Vise andre og tillknytning
Rekke forfattare: 29512014 (engelsk)Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 5Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

Double-differential dijet cross-sections measured in pp collisions at the LHC with a 7 TeV centre-of-mass 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 cross-sections are presented at the particle level. Cross-sections 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 cross-sections are compared with next-to-leading-order perturbative QCD calculations by NLOJet++ corrected to account for non-perturbative effects. Comparisons with POWHEG predictions, using a next-to-leading-order matrix element calculation interfaced to a parton-shower 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.

sted, utgiver, år, opplag, sider
2014. Vol. 5
Emneord [en]
Jets, Jet physics, Hadron-Hadron Scattering
HSV kategori
Identifikatorer
URN: urn:nbn:se:kth:diva-148009DOI: 10.1007/JHEP05(2014)059ISI: 000336740400001Scopus ID: 2-s2.0-84925759768OAI: oai:DiVA.org:kth-148009DiVA, id: diva2:734062
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QC 20140714

Tilgjengelig fra: 2014-07-14 Laget: 2014-07-14 Sist oppdatert: 2019-12-04bibliografisk kontrollert

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Strandberg, Jonas

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Jovicevic, JelenaKuwertz, EmmaJensen, BengtMorley, AnthonyStrandberg, Jonas
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Journal of High Energy Physics (JHEP)

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