Measurement of dijet azimuthal decorrelation in ppcollisions at [Formula: see text

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Mozer,E Brondolin,K Stenson,C H Jiang,N Wardle,N Bacchetta,K Mondal,A K Kalsi,J P Gomez,F Ptochos,M Naseri,M M Baarmand,A Apyan,E Schlieckau,H Bakhshiansohi,H Perrey,C Brew,M Choi,K Borras,S Flowers,M Felcini,R Wolf,H S Chen,S Mersi,S Dogra,D Arcaro,K Kanishchev,D Anderson,A Ahmad,C.-E Wulz,D Moran,G Hanson,V R Tavolaro,R Castello,R M Harris,A Venturi,J Fan,A Lath,A Bean,A Cabrera,P Janot,J Wang,B Gomez Moreno,L Benussi,B Roozbahani,P Traczyk,Q Ingram,J Heilman,P A Razis,S K Park,T Peltola,I D Reid,J Sturdy,J F Low,L Perrini,L Fiore,G Mavromanolakis,M Merschmeyer,D Pellett,F Rezaei Hosseinabadi,A De Wit,P Luukka,A Snigirev,J C Ruiz Vargas,N Beliy,D Strom,M Zakaria,S Belforte,P Silva,M Albrow,L Bäni,A Meyer,M Correa Martins ,Ying Yang ,A Rinkevičius ,O Long ,K Krajczár ,Juan Ramon Castiñeiras De Saa ,R López-Fernández ,А Спиридонов ,C Peña ,F Nessi‐Tedaldi ,O Buchmüller ,Fábio Lúcio Alves ,N Filipović ,S Başeğmez ,G Önengüt ,D De Jesus Damião ,R Pleština ,K Buńkowski ,Tao Huang ,Feng Liu ,Р Тенчини ,D Ferenček ,N Godinović ,Н Голубев ,H Flächer ,N Béni ,Gian Luca Pinna Angioni ,Stefan Michael Heindl ,D Kotliński ,S Perriès ,В Сулимов ,A Sánchez-Hernández ,Marco Esposito ,Mukund Varma ,Sarah Seif El Nasr-Storey ,Maria Agnese Ciocci ,H Oğul ,I Hoş ,Riccardo Andrea Manzoni ,O González López ,Z Szillási ,B T Carlson ,Lloyd Stanley Durkin ,Y Chào ,R Démina ,A García-Bellido ,A Çelik ,P Maksimović ,G Mäggi ,Alexey Finkel ,Yongjie Xin ,A Çakır ,J M Hernández ,A Adıgüzel ,Mehmet Özgür Sahin ,A Polatöz ,Angelo De Souza Santos ,P Adžić ,Wolfram Dietrich Zeuner ,Rajdeep Mohan Chatterjee ,M Calderón De La Barca Sánchez ,I P J Shipsey ,M Kröhn ,F Pauß ,Frank Roscher ,A Rácz ,H Białkowska ,Simranjit Singh Chhibra ,Gian Michele Innocenti ,A Calderón ,M Besançon ,M Fernández ,Arne-Rasmus Draeger ,Andras Hazi ,B Wysłouch ,É Chapon ,I González Caballero ,E Eşkut ,В Качанов ,C Oʼbrien ,Anna Julia Zsigmond ,Giulia D'imperio ,A C König ,Michael Benjamin Andrews ,C Martínez-Rivero ,V Brigljević ,Donald Belknap ,S Czellár ,K Höepfner ,Hannsjoerg Artur Weber ,G Gökbulut ,F Siklér ,Thea Klaeboe Aarrestad ,S Argirò ,Y Güler ,Jordon Rowe Adams ,Jui-Fa Tsai ,H Castilla‐Valdez ,C Ávila ,Wan Ahmad Tajuddin Wan Abdullah ,Merve Ozcan ,E Clément ,C Y Lin ,R Plačakytė ,F Özok ,А Калинин ,Jeremie Alexandre Merlin ,Edgar Casimiro Linares ,Z Xu ,C Hajdú ,Deepak Kumar Sahoo ,М Фингер ,P Milenović ,P Garcı́a-Abia ,J Fernández Menéndez ,M Lipiński ,M Grünewald ,T Ševa ,J Molnár ,E Pérez ,Michael Henry Schmitt ,Ž Antunović ,D Ćutts ,B Akgün ,Ashraf Mohamed ,J Malclès ,Gaia Maria Berruti ,C Tuvé ,B Ujvári ,Peter Hansen ,V Reković ,J Hoß ,G Gómez ,L Felď ,В Жуков ,Raymond Patrick Kenny ,Jimin George ,S Đurić ,I Dumanoğlu ,A Hernández-Almada ,S Dubé ,Mirena Ivova Paneva ,V Veszprémi ,Zainol Abidin Ibrahim ,B Işıldak ,J A Gómez ,J Milošević ,Mohd Adli Bin Ali ,K Cankoçak ,G Garcı́a ,J Andreä ,Jaehoon Lim ,P Jež ,D Horváth ,Manqi Ruan ,V Dūdėnas ,A Zagoździńska ,E Palencia Cortezón ,G Martı́nez ,S Çerçi ,А Александров ,Maria Florencia Canelli ,Sam Daniel Mullin ,V Lemaı̂tre ,D Blöch ,J Königsberg ,Saša Mićanović ,J Królikowski ,M Déjardin ,Simon Fink ,T Schöerner-Sadenius ,Sanjeev Kumar ,A Rýd

doi:10.1140/epjc/s10052-016-4346-8

Abstract

A measurement of the decorrelation of azimuthal angles between the two jets with the largest transverse momenta is presented for seven regions of leading jet transverse momentum up to 2.2,mathrm{TeV}. The analysis is based on the proton-proton collision data collected with the CMS experiment at a centre-of-mass energy of 8,mathrm{TeV} corresponding to an integrated luminosity of 19.7,text {fb}^{-1}. The dijet azimuthal decorrelation is caused by the radiation of additional jets and probes the dynamics of multijet production. The results are compared to fixed-order predictions of perturbative quantum chromodynamics (QCD), and to simulations using Monte Carlo event generators that include parton showers, hadronization, and multiparton interactions. Event generators with only two outgoing high transverse momentum partons fail to describe the measurement, even when supplemented with next-to-leading-order QCD corrections and parton showers. Much better agreement is achieved when at least three outgoing partons are complemented through either next-to-leading-order predictions or parton showers. This observation emphasizes the need to improve predictions for multijet production.

Highlights

Hadronic jets with large transverse momenta pT are produced in high-energy proton-proton collisions when two partons interact with high momentum transfer via the strong force
This paper reports the measurement of the normalized dijet differential cross section as a function of the dijet azimuthal angular separation, 1 dσdijet, σdijet d φdijet for seven regions of the leading jet pT, pTmax, within a rapidity region of |y| < 2.5
Comparisons are made to fixed-order predictions up to NLO for 3-jet production, and to NLO and leading order (LO) dijet as well as to treelevel multijet production, each matched with parton showers and complemented with multiparton interactions and hadronization

Summary

Introduction

Hadronic jets with large transverse momenta pT are produced in high-energy proton-proton collisions when two partons interact with high momentum transfer via the strong force. At leading order (LO) in perturbative quantum chromodynamics (pQCD), two final-state partons are produced back-to-back in the transverse plane. For this case, the azimuthal angular separation between the two leading pT jets in the transverse plane, φdijet = |φjet1 − φjet2|, equals π. This paper reports the measurement of the normalized dijet differential cross section as a function of the dijet azimuthal angular separation,. Comparisons are made to fixed-order predictions up to NLO for 3-jet production, and to NLO and LO dijet as well as to treelevel multijet production, each matched with parton showers and complemented with multiparton interactions and hadronization.

The CMS detector

Event reconstruction and selection

Measurement of the dijet cross section differential in φdijet

Predictions from fixed-order calculations in pQCD

Findings

Summary