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Azimuthal separation in nearly back-to-back jet topologies in inclusive 2- and 3-jet events in ${\text {p}} {\text {p}} $ collisions at $\sqrt{s}=13\,\text {Te}\text {V} $

CMS Collaboration; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Ambrogi, F.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Del Valle, A. Escalante; Flechl, M.; Frühwirth, R.; Ghete, V. M.; Hrubec, J.; Jeitler, M.; Krammer, N.; Krätschmer, I.; Liko, D.; Madlener, T.; ... mehr

Abstract:
A measurement for inclusive 2- and 3-jet events of the azimuthal correlation between the two jets with the largest transverse momenta, Δϕ 12
Δϕ12
, is presented. The measurement considers events where the two leading jets are nearly collinear (“back-to-back”) in the transverse plane and is performed for several ranges of the leading jet transverse momentum. Proton-proton collision data collected with the CMS experiment at a center-of-mass energy of 13TeV
13TeV
and corresponding to an integrated luminosity of 35.9fb −1
35.9fb−1
are used. Predictions based on calculations using matrix elements at leading-order and next-to-leading-order accuracy in perturbative quantum chromodynamics supplemented with leading-log parton showers and hadronization are generally in agreement with the measurements. Discrepancies between the measurement and theoretical predictions are as large as 15%, mainly in the region 177 ∘ <Δϕ 12 <180 ∘. The 2- and 3-jet measurements are not simultaneously described by any of models.

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Verlagsausgabe §
DOI: 10.5445/IR/1000098361
Veröffentlicht am 19.09.2019
Originalveröffentlichung
DOI: 10.1140/epjc/s10052-019-7276-4
Coverbild
Zugehörige Institution(en) am KIT Institut für Experimentelle Teilchenphysik (ETP)
Publikationstyp Zeitschriftenaufsatz
Jahr 2019
Sprache Englisch
Identifikator ISSN: 1434-6044, 1434-6052
KITopen-ID: 1000098361
Erschienen in The European physical journal / C
Band 79
Heft 9
Seiten Article: 773
Bemerkung zur Veröffentlichung Gefördert durch SCOAP3
Vorab online veröffentlicht am 18.09.2019
Schlagworte CMS; Physics; QCD; Jets; Azimuthal angle; MC generators
Nachgewiesen in arXiv
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