# 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; Canelli, M Florencia; Kilminster, Benjamin; Aarrestad, Thea K; Brzhechko, Danyyl; Caminada, Lea; de Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hreus, Tomas; Leontsinis, Stefanos; Neutelings, Izaak; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Wertz, Sebastien; Zucchetta, Alberto; et al (2019). Azimuthal separation in nearly back-to-back jet topologies in inclusive 2- and 3-jet events in ${\text {p}} {\text {p}}$ collisions at $\sqrt{s}=13\,\text {Te}\text {V}$. European Physical Journal C - Particles and Fields, C79(9):773.

## Abstract

A measurement for inclusive 2- and 3-jet events of the azimuthal correlation between the two jets with the largest transverse momenta, $\varDelta \phi _{12}$, 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 13 $\,\text {Te}\text {V}$ and corresponding to an integrated luminosity of 35.9 ${\,\text {fb}^{-1}}$ 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 $177^\circ< \varDelta \phi _{12} < 180^\circ$. The 2- and 3-jet measurements are not simultaneously described by any of models.

## Abstract

A measurement for inclusive 2- and 3-jet events of the azimuthal correlation between the two jets with the largest transverse momenta, $\varDelta \phi _{12}$, 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 13 $\,\text {Te}\text {V}$ and corresponding to an integrated luminosity of 35.9 ${\,\text {fb}^{-1}}$ 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 $177^\circ< \varDelta \phi _{12} < 180^\circ$. The 2- and 3-jet measurements are not simultaneously described by any of models.

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