Search for quark contact interactions and extra spatial dimensions using dijet angular distributions in proton–proton collisions at [formula omitted

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Tosi ,W Carvalho ,J.h Kim ,W Behrenhoff ,J Turkewitz ,M Olszewski ,P Klabbers ,K Stenson ,K Y Kao ,P Ronchese ,K Theofilatos ,K Lannon ,R Y Zhu ,S Bilmis ,M Azarkin ,T Ševa ,Y Musienko ,T Bergauer ,C Dozen ,P Jarry ,J Linacre ,L Uvarov ,O Bondu ,D Hits ,A Meyer ,Z L Trócsányi ,M Chen ,U Dosselli ,T Hebbeker ,M Marone ,R Plačakytė ,A Petrilli ,S Bianco ,W Dominik ,D Fehling ,I Ross ,C M Kuo ,M Vergili ,M Della Negra ,C Lin ,Fırat Duru ,R Erbacher ,J Conway ,F Bachmair ,T Eichhorn ,I Villella ,L Sulak ,J Rander ,B Bilki ,K Sumorok ,J Talvitie ,A Messineo ,G Flügge ,N Eggert ,F Couderc ,G Mittag ,A Safonov ,B Francis ,R Kumar ,J Veverka ,A Savoy-Navarro ,Q Python ,M Hempel ,A Gurrola ,M Paulini ,N Strobbe ,N Cartiglia ,B Hong ,R Lane ,D Domínguez Vázquez ,K Petridis ,P Tan ,C Kottachchi Kankanamge Don ,S Dittmer ,R Ulrich ,M Simon ,D Duchardt ,P Azzurri ,N Béni ,P Bunin ,R Hall-Wilton ,A Levine ,H Topakli ,M Yang ,V Maroussov ,C Welke ,V Dutta ,P Garcı́a-Abia ,J A Coughlan ,H Liu ,E J 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Vila ,C Hill ,H Kim ,M Bergholz ,A Pérez-Calero Yzquierdo ,K Piotrzkowski ,M Hildreth ,F Meier ,A Cimmino ,P Goldenzweig ,S Sekmen ,S Wayand ,G Karapostoli ,I Fisk ,A Santocchia ,S Ragazzi ,M Squires ,T Sakuma ,I Volobouev ,D Giordano ,P Lobelle Pardo ,D Marlow ,D Benedetti ,K Kotov ,K Klein ,M Segala ,I Osipenkov ,A Agapitos ,G.n Kim ,J Hardenbrook ,E Salvati ,N Demaria ,P Milenović ,P Gras ,M A Ciocci ,G Mitselmakher ,E Gülmez ,S Ochesanu ,R Eusebi ,P T Cox ,P Checchia ,S Beranek ,V Perelygin ,M Chasco ,A Delgado Peris ,M Wayne ,Sh Jain ,J Seixas ,D Matos Figueiredo ,C Contreras-Campana ,M Albrow ,W Lohmann ,I Macneill ,P Baillon ,L Perrini ,A Schmidt ,Sinem Salva Diblen ,K W Bell ,C Hajdú ,P Kreuzer ,T Lapsien ,S Kwan ,A Dabrowski ,L Vanelderen ,U Heintz ,B Boimska ,A De Cosa ,C Maguire ,A Holzner ,A Çakır ,M Johnson ,F Fiori ,V Re ,S Harper ,A Savin ,I Suarez ,J Freeman ,S Dildick ,A Escalante Del Valle ,A Calamba ,D Gyun ,T Speer ,B Diamond ,J Wang ,B Betchart ,P Depasse ,B Clerbaux ,P G Verdini ,A Mestvirishvili ,T Kolberg ,J S Werner ,K Dilsiz ,S Tavernier ,J Hrubec ,R M Harris ,N Skatchkov ,S Boutle ,F Cossutti ,M Giffels ,R Schöfbeck ,N De Filippis ,N Redaelli ,S V Rusakov ,T Hauth ,A Perrotta ,A Ferapontov ,C Lazaridis ,R Gerosa ,D Horváth ,B Lee ,S Gennai ,A Svyatkovskiy ,J Hugon ,I Bucinskaite ,A Ahmad ,P Bargassa ,A Tropiano ,R Potenza ,J Lauwers ,T Khurshid ,M Bontenackels ,L Calligaris ,C Silkworth ,N Hörmann ,A Polatöz ,B Rahbaran ,A Bornheim ,G Mesyats ,B Gobbo ,A Rose ,M Gavrilenko ,S Rappoccio ,S Schnetzer ,J P Gomez ,P Meridiani ,S Paramesvaran ,J M Hernández ,Y Mao ,B Cox ,Y M Tzeng ,L Uplegger ,J.-L Agram ,R Wilken ,M Ćwiok ,M Merola ,F Primavera ,S Shrestha ,J R Vlimant ,L Perniè ,M Wolf ,M Olschewski ,M Stoye ,L Demortier ,M Lo Vetere ,E C Chabert ,J Gronberg ,A O M Iorio ,J E Cole ,A Bodek ,C Clarke ,G Polese ,S Spanier ,N Chanon ,A Ivanov ,E Tuominen ,H Jung ,S Jindariani ,L Sudic ,Y Kim ,S Piperov ,S R Wagner ,J Lingemann ,I Svintradze ,D Troendle ,C Favaro ,M M Obertino ,J Poehlsen ,T Perry ,J Wagner-Kuhr ,K Rabbertz ,S Dasu ,A J Bell ,D Gulhan ,F Raupach ,S Simon ,M Mannelli ,R Bainbridge ,I A Cali ,F Yumiceva ,A David ,S Panwalkar ,B Michlin ,N Cripps ,P Verdier ,I Dremin ,D Kotliński ,S Hewamanage ,P Rumerio ,S Dogra ,S Lee ,F Ptochos ,N Mirman ,N Mohr ,K Burt ,N Zaganidis ,Y Gershtein ,K Kovitanggoon ,H Kalakhety ,T Poehlsen ,R Guida ,S C Kao ,M Plagge ,M De Mattia ,H A Weber ,J Haller ,B Millan Mejias ,W Erdmann ,V D Elvira ,М Фингер ,Arne-Rasmus Draeger ,S Won ,S Sen ,N Woods

doi:10.1016/j.physletb.2015.04.042

Abstract

A search is presented for quark contact interactions and extra spatial dimensions in proton–proton collisions at s=8 TeV using dijet angular distributions. The search is based on a data set corresponding to an integrated luminosity of 19.7 fb−1 collected by the CMS detector at the CERN LHC. Dijet angular distributions are found to be in agreement with the perturbative QCD predictions that include electroweak corrections. Limits on the contact interaction scale from a variety of models at next-to-leading order in QCD corrections are obtained. A benchmark model in which only left-handed quarks participate is excluded up to a scale of 9.0 (11.7) TeV for destructive (constructive) interference at 95% confidence level. Lower limits between 5.9 and 8.4 TeV on the scale of virtual graviton exchange are extracted for the Arkani-Hamed–Dimopoulos–Dvali model of extra spatial dimensions.

Highlights

High momentum-transfer proton-proton collisions at the CERN LHC probe the dynamics of the underlying interaction at distances below 10−19 m
A suitable observable for this purpose is the dijet angular distribution [1] expressed in terms of χdijet = exp(|y1 − y2|), where y1 and y2 are the rapidities of the two jets with the highest transverse momenta
In this Letter, we extend previous searches for contact interactions to higher CI scales, for a wide range of models that include the exact NLO QCD corrections to dijet production

Summary

Introduction

High momentum-transfer proton-proton collisions at the CERN LHC probe the dynamics of the underlying interaction at distances below 10−19 m. Often these collisions produce a pair of jets (dijets) approximately balanced in transverse momentum pT. In perturbative QCD the dijet angular distribution at small c.m. scattering angles is approximately independent of the underlying partonic level process and exhibits behavior similar to Rutherford scattering, characteristic of spin-1 particle exchange. Note that the models with positive (negative) ηLL or ηRR lead to destructive (constructive) interference with the QCD terms and a lower (higher) cross section in the limit of high partonic c.m. energies. In all CI models discussed in this Letter, next-to-leading-order (NLO) QCD corrlΛeea±RcdtRiomtnoostdhaereelssearmemspuellosteyinnesdiidttieovnicttyiac.lacFlutolrareteeΛ-ltV±ehVveeaclnrcodrsosΛsss±AesAcet,citoaisnonsw.seIalnnl dpasrNoftoLorOnΛ-cp±(orVro−rteoAcn)t,icothonlesl,iCsaiInondpsrceotdhniescetΛiqo±LunLesnaantrldye identical at tree-level, but exhibit different NLO corrections and yield different sensitivity

Event selection

Cross section unfolding and uncertainties

Theoretical predictions

Results

Summary

B The CMS Collaboration