Jet Shapes of Isolated Photon-Tagged Jets in Pb-Pb and pp Collisions at sqrt[s_{NN}]=5.02 TeV.

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Syarif,L Bäni,T Wamorkar,C Maguire,S Abdullin,C Seitz,S Jindariani,M Citron,S Muthumuni,E Palencia Cortezon,M Pierini,S Elgammal,S Gelli,R Kumar,S Harper,R Vidal,D Pinna,G Dissertori,C Hensel,S Banerjee,A Tapper,M Bluj,D Sunar Cerci,J Pilot,R Mueller,Z Tao,Y Wang,A Karneyeu,I Van Parijs,S Lee,R Gerosa,A Wisecarver,N Amapane,I Vardanyan,A Skuja,A Roy,A Geiser,S Paramesvaran,S Simon,M Quittnat,I Yu,L Li,F Hartmann,A Attikis,A Di Mattia,J Wittmann,B Safarzadeh,P De Castro Manzano,S Braibant-Giacomelli,J Marco,G Smith,S Maselli,V Epshteyn,S Stoynev,S Afanasiev,T Sarkar,U Bhawandeep,J Dolen,I Evangelou,M Lohan,G Benelli,T Järvinen,C Caputo,E Schmitz,D Yu,C Caillol,R Potenza,A Johnson,A Kropivnitskaya,D Bonacorsi,A Benaglia,A Penzo,A Mertens,M Preuten,M Verzetti,D Moran,G Negro,N Marinelli,A Venturi,A Psallidas,F Cenna,M Rahmani,A Dierlamm,M De Palma,G Zevi Della Porta,S Rappoccio,F Monti,A Beretvas,P Silva,O Toldaiev,H Trauger,M Szleper,A Tsirou,T Esch,G Della Ricca,B Kreis,M Misiura,E 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Liu,E Di Marco,P Kumari,M Meyer,J Mousa,A Bodek,D D’Enterria,C You,K Ozdemir,A Fagot,R Breedon,S Petrushanko,P Dauncey,J Strait,T Eichhorn,N Bacchetta,T Huang,M Erdmann,J Hrubec,V Dutta,N Skatchkov,S Carrillo Moreno,O Surányi,C Rovelli,A Hinzmann,P Gunnellini,S Bahinipati,A Bhardwaj,D Rabady,D Taylor,B Chazin Quero,T Klijnsma,R Goldouzian,A Delgado,V Sordini,N Pastika,F Lagarde,S Obraztsov,M Sani,L Perrozzi,S Orfanelli,U Dosselli,D Rosenzweig,A Grohsjean,P Chang,C Cecchi,P Robmann,T Mitchell,M Krammer,S Freed,P Gras,C Vernieri,E Boos,G Anagnostou,N Daci,C Richardson,L Borgonovi,M Wayne,J Hauk,A Beschi,N Krasnikov,Y Ivanov,G Zito,J Sturdy,M Misheva,A Carnes,B Hashemi,C Roland,J Strologas,V Jha,P Paolucci,H Van Haevermaet,R Kinnunen,A Yagil,V Khristenko,A Escalante Del Valle,I Mikulec,J Tuominiemi,S Narayanan,F Vazquez Valencia,K Wichmann,A Harb,A Pfeiffer,A Saddique,S Wang,H Siikonen,G Fedi,A Aleksandrov,M Walker,S Albergo,N Tyurin,F Couderc,R Mankel,P Wittich,D Roy,L Viliani,N Tosi,J 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Baidali,D Smith,H Qiu,T Dreyer,L Litov,E Fontanesi,L Wang,D Rathjens,V Karjavine,M Planer,F Rezaei Hosseinabadi,B Kiani,A Rose,G Landsberg,S Wasserbaech,J Goh,D Cussans,V Hagopian,O Kukral,K Sung,S Thüer,S Gadrat,W Lohmann,G Perrin,S My,H Wei,C West,A Pashenkov,M Tosi,V Popov,B Ille,M Merschmeyer,P Govoni,M Komm,N Kellams,D Del Re,M Zientek,C Tully,A Perloff,A Stepennov,D Majumder,J Fulcher,M Wolf,V Oreshkin,E Yazgan,A Dasgupta,D Barney,M Aldaya Martin,G Walia,R Bi,M Peruzzi,A Askew,D Gonzalez,N Postiau,M Vidal Marono,B Bilki,A Vartak,M Selvaggi,M Schröder,S Zahid,E Torassa,B Stieger,L Moroni,L Fanò,P Tan,A Byszuk,H Lee,E Sexton-Kennedy,V Ciulli,M Seidel,M Hadley,A Apyan,J Rander,I Antropov,A Godshalk,R Kamalieddin,D Krücker,G Grenier,M Bianco,C Uribe Estrada,V Chekhovsky,N Eminizer,A Sobol,F Moortgat,M Akbiyik,D Krofcheck,S Lo Meo,H Mei,V Sharma,D Lontkovskyi,A Gozzelino,A Cocoros,G Rauco,E De La Cruz-Burelo,J De Clercq,M Cremonesi,P Siddireddy,K Jung,K Doroba,M Derdzinski,A 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Bornheim,G Selvaggi,J Pekkanen,J Hauser,V Candelise,A Bermúdez Martínez,S Ganjour,D Sperka,P Lecoq,M Giffels,D Menasce,S Dugad,Alberto Sánchez Hernández ,V R Tavolaro ,B Işıldak ,B L Winer ,M C Fouz ,F Özok ,C A Bernardes ,F L Navarria ,D J A Cockerill ,S V Gleyzer ,S K Pflitsch ,C Işik ,A Çelik ,Kin Ho Lo ,M Calderón De La Barca Sánchez ,Joaquin Emilo Siado ,I González Caballero ,D Horváth ,Y R Joshi ,M Ramírez-García ,E M Gregores ,F Siklér ,J W Gary ,É Chapon ,M Lipiński ,E Eşkut ,E A De Wolf ,В Качанов ,H Castilla‐Valdez ,M J Costa ,H D Yoo ,K S Lee ,G L Pinna Angioni ,Y D Oh ,B R Yates ,Z L Trócsányi ,C H Jiang ,J B Singh ,F R Cavallo ,F M Pitters ,J R Komaragiri ,F Nessi‐Tedaldi ,Fábio Lúcio Alves ,J A Coughlan ,B Akgün ,L J Sanchez Rosas ,J E Cole ,V Veszprémi ,S B Beri ,G Y Jeng ,Rajdeep Mohan Chatterjee ,J M Hernández ,M A Harrendorf ,M Csanád ,R M Harris ,J S Wood ,G Gómez ,A Rýd ,S B Oh ,E Clément ,E M Da Costa ,Feng Liu ,C H Shepherd‐Themistocleous ,M T Lucchini ,G 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A Shah ,S M Etesami ,A C Marini ,S Czellár ,J A Brochero Cifuentes ,J Königsberg ,A W Jung ,S Çerçi ,Sanjeev Kumar ,M N Yusli ,R R Betts ,S S Chhibra ,S W Lee ,R Démina ,M M Baarmand ,Humberto Antonio Salazar Ibarguen ,H S Kim ,Thomas Müller ,Y Yang ,J N Butler ,M Grünewald ,Mirena Ivova Paneva ,I C Park ,G Hamel De Monchenault ,G N Kim ,H B Newman ,P H Chen ,V Rodŕıguez Bouza ,M W Arenton ,S C Eno ,S Özkorucuklu ,R D Field ,S I Cooper ,D Blöch ,R Reyes-Almanza ,T H Doan ,M R Adams ,V J Smith ,G I Veres ,D A Hangal ,Peter Hansen ,A García-Bellido ,C Tuvé ,M N Bakirci ,M V Nemallapudi ,Stefan Michael Heindl ,J Molnár ,C F Gonźalez Herńandez ,C E N Niemeyer ,A T Meneguzzo ,B W Allen ,C Peña ,R A Manzoni ,D H Miller ,J L Dulemba ,Merve Nazlım Ağaras ,Jae Hoon Lim ,M Déjardin ,F A Triantis ,A C Mignerey ,P J Fernández Manteca ,W A Khan ,J R Patterson ,P K Rout ,H S Chen ,P C Tiwari ,G R Snow ,P K Behera ,I Dumanoğlu ,I O Atakisi ,John Michael Marraffino ,J B Sauvan ,S Argirò ,Yuan Li ,T Á Vámi ,E A Yetkin ,S Perriès ,D H Kim ,D M Raymond ,I J Cabrillo ,T J Kim ,D R Claes ,J P Chou ,E J Tonelli Manganote ,Alberto Orso Maria Iorio ,S Dubé ,J L Faure ,E W Vaandering ,Yu‐Wei Chang ,I A Cali ,K Höepfner ,D H Zhu ,P Maksimović ,J Malclès ,K F Johnson ,J G Acosta ,C Ávila ,O Buchmüller ,V Brigljević ,R G Kellogg ,Deepak Kumar Sahoo ,M I Nagy ,L Felď ,A A Bin Anuar ,T Maënpaä ,P Adžić ,D M Newbold ,S R Wagner ,U K Yang ,S Sánchez Cruz ,J A Merlin ,J Królikowski ,Н Голубев ,A Rácz ,J K Heikkilä ,I S Zorbakir ,M T Meinhard ,H R Hoorani ,J R Vlimant ,P Martínez Ruiz Del Arbol ,O Long ,S C Tonwar ,K Buńkowski ,Y F Liu ,А Спиридонов ,Gian Michele Innocenti ,K F Chen ,J J Brooke ,Mara Senghi Soares ,S K Park ,A G Delannoy ,A V Gritsan ,Rocky Bala Garg ,R K Dewanjee ,J H Kim ,J A Murillo Quijada ,W J Spalding ,S V Rusakov ,G M Dallavalle ,M Schmitt ,M Correa Martins ,Guillelmo Gomez Ceballos ,M E Dinardo ,Sergio F Novaes ,А Калинин ,T Y Ling ,J M Hogan ,Michael Benjamin Andrews ,S Swain ,Z Shi ,R Y Zhu ,P T Cox ,Maria Florencia Canelli ,S A Wiederkehr ,I R Tomalin ,A H Ball ,F M Stober ,В Сулимов ,W T Ford ,Hannsjoerg Artur Weber ,B Ujvári ,D C Son ,G B Cerati ,M B Tonjes ,L K Saini ,C C Peng ,Z S Demiroglu ,J Fernández Menéndez ,D M Morse ,P G Mercadante ,Lloyd Stanley Durkin ,A Calderón ,M A Wadud ,A Çakır ,Z A Ibrahim ,J Andreä ,A Polatöz ,Benjamin Charles Radburn-Smith ,B E Cox ,C Hajdú ,G M Chen ,P Milenović ,S Y Hoh ,S Đurić ,C Martínez Rivero ,G M Bilei ,H J Simonis ,R M Brown ,U G Tok ,M M Obertino ,M J Kortelainen

doi:10.1103/physrevlett.122.152001

Abstract

The modification of jet shapes in Pb-Pb collisions, relative to those in pp collisions, is studied for jets associated with an isolated photon. The data were collected with the CMS detector at the LHC at a nucleon-nucleon center-of-mass energy of 5.02TeV. Jet shapes are constructed from charged particles with track transverse momenta (p_{T}) above 1 GeV/c in annuli around the axes of jets with p_{T}^{jet}>30 GeV/c associated with an isolated photon with p_{T}^{γ}>60 GeV/c. The jet shape distributions are consistent between peripheral Pb-Pb and pp collisions, but are modified for more central Pb-Pb collisions. In these central Pb-Pb events, a larger fraction of the jet momentum is observed at larger distances from the jet axis compared to pp, reflecting the interaction between the partonic medium created in heavy ion collisions and the traversing partons.

Highlights

The modification of jet shapes in Pb-Pb collisions, relative to those in pp collisions, is studied for jets associated with an isolated photon
To better understand the dynamics of the quark-gluon plasma (QGP), it is important to explore the mechanisms by which the partons lose energy to the medium, whether by radiation, scattering off its pointlike constituents, or by some other processes [8,9,10,11,12]
This Letter reports the first measurement of the differential jet shape for jets associated with an isolated photon

Summary

The differential jet shape ρðrÞ is defined as

; ð1Þ where δr 1⁄4 rb − ra is the width of the annulus of inner and outer radii ra and rb with respect to the jet axis, respectively, the jet ptTrk is the with pjTet, pT of tracpksffiffifffiaffiffiffilffilffiiffinffiffiffigffiffiffiwffiffiffiffiiffitffihffiffiffiiffinffiffiffiffieffiffiaffifficffiffihffiffiffiaffiffiffinffiffinffiffiuffiffiffilffiuffiffisffiffi and r 1⁄4 ðηjet − ηtrkÞ2 þ ðφjet − φtrkÞ2 of is the distance between the track and the jet axis in pseudorapidity (η) and azimuthal angle (φ) plane. (ii) The jet shapes obtained after the first step are corrected to the ones that use true charged particles from the signal PYTHIA event This step accounts for the correlations between the reconstructed jet and tracks from the UE and is applied for Pb-Pb data only. No significant depletion is seen in central collisions for intermediate r, as was observed in the aforementioned inclusive jet shape and leading jet shape results This could be because of tagging the jet sample with isolated photons, which increases the quark jet fraction, and because of the lower pjTet threshold, which increases the fraction of less collimated jets (including those with a larger relative energy loss). The modifications demonstrate that for hard scatterings that predominantly produce quarks with similar momentum distributions in pp and Pb-Pb collisions, as identified by the photon tag, the jet momentum is distributed at greater radial distance in Pb-Pb collisions

This significant redistribution of energy observed in central

ATLAS fication

CMS in pp

Findings

Modifications of Jet Fragmentation in PbPb Collisions