Constraining Gluon Distributions in Nuclei Using Dijets in Proton-Proton and Proton-Lead Collisions at sqrt[s_{NN}]=5.02 TeV.

A M Sirunyan ,B Clerbaux,A Delgado Peris,J Zobec,S Shalhout,A Vorobyev,D Pellett,D Bisello,A Juodagalvis,I Lokhtin,M Verzocchi,P Saxena,M Musich,C Snyder,N Manthos,S Cho,R Covarelli,J Letts,F Zhang,F Moortgat,A Nayak,C Brew,A Venturi,T Sinthuprasith,A Triossi,W Li,A Agapitos,H Kirschenmann,A Pompili,S Hagopian,A Barnyakov,S Paramesvaran,S Dildick,H Siikonen,G Bolla,S Lezki,M Alhusseini,D Beghin,S Obraztsov,M Della Negra,D Di Croce,C Dorfer,G Karapostoli,T Frueboes,Z Zhang,L Alunni Solestizi,J Thom,A Canepa,D Smith,V Trofimov,D Vannerom,M Thiel,J Schulz,I Smirnov,C Dozen,B Penning,R.-S Lu,K Kaadze,B Gomber,Z Demiragli,S Jabeen,K Doroba,F Beaudette,Y Ivanov,S Casasso,N Akchurin,T Cheng,F Kassel,F Errico,P Connor,A Künsken,P David,S Zhang,O Evdokimov,E Gurpinar,J Ngadiuba,Y Onel,J Duarte,M Zientek,T Bose,J Wang,E Tziaferi,M Oglakci,R Wolf,A De Cosa,R Frühwirth,S Lacaprara,V Matveev,L Mastrolorenzo,P Mandrik,P Kontaxakis,S Stoynev,J De Clercq,M Franco Sevilla,P Kumari,M Misiura,P Rumerio,G Bagliesi,P Chang,E Tiras,A Petrilli,E Laird,C Smith,N Leonardo,J Hegeman,K Androsov,K Lassila-Perini,Y Chen,R Montalvo,A Campbell,V Monaco,N Mucia,C Paus,M Endres,E Focardi,M Kaur,C Grab,T James,A Rose,S Salur,E Paradas,S Thomas,F Blekman,M Pierini,P Shukla,B Galinhas,C Jessop,S Breeze,J Zhang,B Blumenfeld,B Vormwald,L Spiegel,L Antonelli,V Kumar,O Prokofyev,I Suarez,W Lange,M Bharti,P Rebello Teles,R Gonzalez Suarez,M Tytgat,L Apanasevich,V Chekhovsky,T Aziz,I Mikulec,A Stakia,C Palmer,D Velicanu,P Janot,M Jeitler,L Thomas,A Lelek,V Krutelyov,S Cittolin,B Mcmaster,R Bi,J Monroy,N Suwonjandee,G Zito,A Ovcharova,R Loveless,B Asavapibhop,D Cussans,A Golunov,J Rander,M Toms,K Thapa,A Snigirev,J Flix,R Lander,M Dobson,B Schneider,D Dobur,Y Musienko,M Maity,Y Roh,S Xie,G Franzoni,D Gulhan,B Vermassen,I Shvetsov,G Majumder,O Turkot,H Nogima,S Keshri,A Mestvirishvili,P Levchenko,E Wolfe,C Caputo,J Roskes,C Amsler,D Dutta,T Virdee,E Eskandari Tadavani,W Verbeke,A Carvalho Antunes De Oliveira,V Veckalns,L Benussi,M Centis Vignali,S Harper,A Babaev,C Ciocca,B Freund,K Theofilatos,F Jensen,K Sumorok,L Romero,K Piotrzkowski,A Levin,V Epshteyn,P Busson,S Malvezzi,A Lanaro,M Herndon,A Ghezzi,Z Tu,A García Alonso,G Walia,M Dordevic,N Bacchetta,M Kasemann,J Kunkle,H Li,G Rakness,L Fiore,A Reinsvold,L Li,K Harder,V Sharma,A Pfeiffer,M Arneodo,V Palladino,O Kodolova,C Fernandez Bedoya,A Perloff,M Mulhearn,V Cherepanov,D Cieri,R Xiao,M Liu,Sandra S Padula,J Vaitkus,M Weber,S Paoletti,L Barone,F Romeo,K El Morabit,S Tekten,R Klanner,J Mnich,D Loukas,D Abercrombie,S Ragazzi,S Gninenko,N Krammer,O Kukral,L Brianza,A Bundock,S Durgut,G Selvaggi,H Abdalla,R Kumar,R Chierici,M Spiropulu,V Bhatnagar,H Qiu,D Konstantinov,U Joshi,S Mukherjee,S Sekmen,W Busza,J Hanlon,G Rolandi,S Bhowmik,N Pastika,O Kaya,N Bartosik,N Cavallo,J Bradmiller-Feld,A Beschi,N Deelen,P Salvini,M Dragicevic,N Mirman,D Spitzbart,A Vanhoefer,J Wright,N Cartiglia,D Leggat,R Castaldi,P De Castro Manzano,M Kirsanov,A Massironi,L Pacher,M Zeyrek,C Grandi,A Solano,J Varela,A Florent,C Campagnari,J Sun,S H Seo,R Campanini,O Bondu,D Zuolo,O Surányi,P Spagnolo,S Wertz,T Roy,E Longo,D Berry,A Magnani,M Velasco,C Mueller,J.-P Merlo,M Baselga,A Colaleo,E Perez,A Karavdina,E Gülmez,F Ligabue,S Luo,C Galloni,U Goerlach,M Maggi,U Sarica,L Shchutska,A Dishaw,S Laurila,C Scharf,M Narain,M Bluj,C Zorbilmez,M Cipriani,Y Go,U Langenegger,D Stuart,L Moreels,G Mittag,N Loukas,N Marinelli,G Cerminara,M Casarsa,R Vidal,T Williams,Y Cheng,D Acosta,P Schütze,M Osherson,M Verzetti,J Martin Blanco,P Cirkovic,A Pérez-Calero Yzquierdo,Y Wen,A Tumasyan,T Toriashvili,N Odell,T Hebbeker,L Mundim,V O’Dell,E Carrera Jarrin,B Sutar,P Barria,S Kaplan,M Araujo,J.-L Agram,N Kellams,A Braghieri,A Mertens,C Schomakers,V Daponte,A Hart,F Mohamad Idris,W Si,I Van Parijs,V Andreev,P Baringer,R Kamalieddin,L Taylor,G Tonelli,B Mahakud,G Barbagli,D Stickland,D Gastler,A Harb,S Ganjour,K Chatterjee,P Azzi,Z Mao,E Hughes,P Jarry,J 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Monteno,J Suarez Gonzalez,R Wallny,M Planer,C Collard,T Liu,S Kurz,B Bilki,P Govoni,A Romero,A Richards,J Piedra Gomez,L Russo,I Yu,M Ignatenko,K Sandeep,M Trovato,E Scott,J Bowen,M Zanetti,F Lagarde,R Potenza,D Lincoln,K Skovpen,A Savin,K Kothekar,M Dalchenko,M Spanring,C Uribe Estrada,A Dierlamm,M Ruspa,M Kaya,J Pazzini,C Fallon,K Long,E Brondolin,C Sciacca,T Mengke,S Hasegawa,D Ciangottini,G Flügge,K Lannon,A Geiser,P Bargassa,S Damarseckin,C Schwanenberger,A Spiezia,A Di Francesco,N Chanon,F De Guio,A Cabrera,G Benelli,C Ferraioli,F Scheuch,E De La Cruz-Burelo,B Singh,C Bravo,P Van Mulders,T Mitchell,A Jafari,M Zeinali,J Schwandt,R Leonardi,K Nawrocki,M Lohan,Z Liu,H Zhang,A Rosowsky,R Teixeira De Lima,A Sznajder,P Gras,A Modak,D Jeon,A Popov,D Kim,G Kole,G Rauco,P Sheldon,J Goldstein,G Galati,A Güth,M Lethuillier,R Radogna,S Marcellini,M Mulders,L Silvestris,C Amendola,I Evangelou,R Band,S Girgis,G Singh,P Mal,C Henderson,A Karneyeu,B Courbon,A Apyan,M Pieters,J Sonneveld,H 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doi:10.1103/physrevlett.121.062002

Abstract

The pseudorapidity distributions of dijets as functions of their average transverse momentum (p_{T}^{ave}) are measured in proton-lead (pPb) and proton-proton (pp) collisions. The data samples were collected by the CMS experiment at the CERN LHC, at a nucleon-nucleon center-of-mass energy of 5.02TeV. A significant modification of the pPb spectra with respect to the pp spectra is observed in all p_{T}^{ave} intervals investigated. The ratios of the pPb and pp distributions are compared to next-to-leading order perturbative quantum chromodynamics calculations with unbound nucleon and nuclear parton distribution functions (PDFs). These results give the first evidence that the gluon PDF at large Bjorken x in lead ions is strongly suppressed with respect to the PDF in unbound nucleons.

Highlights

The pseudorapidity distributions of dijets as functions of their average transverse momentum are measured in proton-lead and proton-proton collisions
The ratios of the pPb and pp distributions are compared to next-to-leading order perturbative quantum chromodynamics calculations with unbound nucleon and nuclear parton distribution functions (PDFs)
Relativistic heavy ion collisions aim to study the properties of the quark-gluon plasma (QGP) [1,2,3,4], a deconfined state of quarks and gluons expected by quantum chromodynamics (QCD) [5] to exist for very high temperatures and energy densities

Summary

In this performed

Letter, in pPb measurements of and pp collisions adtijpetffisffiffiNpffiffiNffirffio1⁄4du5c.t0io2nTaerVe recorded with the CMS detector and corresponding to integrated luminosities of 35 Æ 1 nb−1 [43] and 27.4 Æ. Data from pPb collisions are measured and presented in a symmetric region around η 1⁄4 0 in the laboratory frame. In order to obtain pp data over the same η range in the nucleonnucleon center-of-mass frame, jets in the interval −3.465 < η < 2.535 are used. When studying pp and pPb data together, and for the purposes of presentation, ηdijet for pp data is shifted by þ0.465, so that both sets of data span jηdijetj < 3.0 in the center-of-mass frame. [26] in that a lower pT for the leading and subleading jets was used (30 vs 120 GeV, and 20 vs 30 GeV, respectively), and in that the present measurement is differential in paTve (5 vs 1 intervals).

The effect of ISR and

CMS Simulation

Findings

Meson Production in TeV Using Exclusive