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.
Highlights
Azimuthal correlations in inclusive 2-jet events have been ms[p3ipoe],nacssoaulanlrtdiesadiobcpnyersnettvbheiyero-outChfs-eMlmyASabTsysCLetoAhnlSelearbDCgoyo0rlaolCtafiboo√onllrsaaab=ttioor√1na.ts9iao6tn=√TiensV7=p,[p1 ̄8,7,c2oT]a,lenliVidn13 TeV [4,5,6], but none of the measurements considered in detail the region close to the back-to-back configuration
The effects of applying a transverse momentum dependent parton showering to the dijet azimuthal angular correlation were studied in [12]
The resulting jet energy scale calibration (JES) uncertainties in the normalized inclusive 2-jet distributions due to bin migrations are less than 2%, whereas for the normalized inclusive 3-jet distributions they are less than 3%
Summary
Azimuthal correlations in inclusive 2-jet events have been ms[p3ipoe],nacssoaulanlrtdiesadiobcpnyersnettvbheiyero-outChfs-eMlmyASabTsysCLetoAhnlSelearbDCgoyo0rlaolCtafiboo√onllrsaaab=ttioor√1na.ts9iao6tn=√TiensV7=p,[p1 ̄8,7,c2oT]a,lenliVidn TeV [4,5,6], but none of the measurements considered in detail the region close to the back-to-back configuration. A detailed study of azimuthal correlations close to the backto-back configuration allows a more precise test of different resummation strategies, and it is a first step towards an improved understanding of the effects of soft initial and final state gluons [7,8]. The inclusive 3-jet distributions, differential in Δφ12 and pTmax, with the pT of third highest pT jet typically being 1-2 orders of magnitude smaller than pTmax, are suitable to test resummation effects arising from the presence of multiple scales in the interaction.
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