Measurement of jet fragmentation into charged particles in pp and PbPb collisions at sqrt(s[NN])= 2.76 TeV

Serguei Chatrchyan,Vardan Khachatryan,A.M. Sirunyan,Armen Tumasyan,Wolfgang Adam,Thomas Bergauer,Marko Dragicevic,Janos Erö,Christian Fabjan,M. Fried,R. Frühwirth,Vasile Mihai Ghete,Josef Hammer,Natascha Hörmann,Josef Hrubec,Manfred Jeitler,Wolfgang Kiesenhofer,Valentin Knünz,Manfred Krammer,Dietrich Liko,Ivan Mikulec,M. Pernicka,Babak Rahbaran,Christine Rohringer,Herbert Rohringer,Robert Schöfbeck,Josef Strauss,Anton Taurok,P. Wagner,Wolfgang Waltenberger,G. Walzel,E. Widl,C-E Wulz,V. Mossolov,N Shumeiko,J. Suarez Gonzalez,S. Bansal,Tom Cornelis,E. A. De Wolf,Xavier Janssen,Sten Luyckx,T. Maes,Luca Mucibello,Silvia Ochesanu,B. Roland,Romain Rougny,Michele Selvaggi,Zlatka Staykova,H. Van Haevermaet,P. Van Mechelen,N. Van Remortel,A. Van Spilbeeck,Freya Blekman,Stijn Blyweert,J. D’Hondt,R. Gonzalez Suarez,A. Kalogeropoulos,M. Maes,Annik Olbrechts,W. Van Doninck,P. Van Mulders,G. P. Van Onsem,Ilaria Villella,O. Charaf,Barbara Clerbaux,G. De Lentdecker,Vincent Dero,Tomas Hreus,Alexandre Léonard,P. E. Marage,T. Reis,Laurent Thomas,C. Vander Velde,Pascal Vanlaer,Jing Wang,Volker Adler,Kelly Beernaert,Anna Cimmino,Silvia Costantini,Guillaume Garcia,M. Grunewald,B. Klein,Jérémie Lellouch,Andrey Marinov,Joseph Mccartin,A. A. Ocampo Rios,D. Ryckbosch,N. Strobbe,Filip Thyssen,Michael Tytgat,Lukas Vanelderen,P. Verwilligen,Sinead Walsh,E. Yazgan,N. Zaganidis,Suzan Basegmez,Giacomo Bruno,R. Castello,A. Caudron,Ludivine Ceard,Christophe Delaere,T. du Pree,Denis Favart,L. Forthomme,Andrea Giammanco,Jonathan Hollar,Vincent Lemaitre,Junhui Liao,Otilia Militaru,Claude Nuttens,Davide Pagano,Lucia Perrini,Arnaud Pin,Krzysztof Piotrzkowski,Nicolas Schul,J. M. Vizan Garcia,Nikita Beliy,Thierry Caebergs,Evelyne Daubie,G. H. Hammad,G.A. Alves,M. Correa Martins,D. De Jesus Damiao,T. Martins,M.-E. Pol,M. H. G. Souza,W. L. Aldá,W. Carvalho,Analu Custódio,E. M. Da Costa,C. De Oliveira Martins,S. Fonseca De Souza,D. Matos Figueiredo,L. Mundim,Helio Nogima,V. Oguri,W. L. Prado Da Silva,A. Santoro,L. Soares Jorge,A Sznajder,C. A. Bernardes,Flavia De Almeida Dias,T. R. Fernandez Perez Tomei,E. M. Gregores,C. Lagana,Franciole Da Cunha Marinho,P. G. Mercadante,S. F. Novaes,Sandra S. Padula,Vladimir Genchev,Plamen Iaydjiev,S Piperov,M. Rodozov,Stefka Stoykova,G. Sultanov,Vanio Tcholakov,R. Trayanov,Mariana Vutova,A. Dimitrov,R. Hadjiiska,V. Kozhuharov,Leander Litov,B. Pavlov,P. Petkov,J. G. Bian,G. Chen,H. S. Chen,Chun-Hua Jiang,D. Liang,Song Liang,X. Meng,Junquan Tao,X. Wang,Z. Wang,H. Xiao,Ming Xu,J Zang,Z. Zhang,C. Asawatangtrakuldee,Y. Ban,S. Guo,Y. Guo,Wenzhao Li,S. Liu,Y. Mao,S. J. Qian,H. Teng,Sean-Jiun Wang,B. Zhu,W. Zou,C. GomezAvila,J. P. Gomez,B. Gomez Moreno,A. F. Osorio Oliveros,J. C. Sanabria,N. Godinovic,D. Lelas,Roko Plestina,Dunja Polic,Ivica Puljak,Z. Antunovic,M. Kovac,V. Brigljevic,S. Duric,K. Kadija,Jelena Luetić,Srećko Morović,A. Attikis,M. Galanti,G. Mavromanolakis,J. Mousa,C. Nicolaou,F. Ptochos,P. A. Razis,M. Finger,Yasser Assran,S. Elgammal,A. Ellithi Kamel,S. Khalil,M. A. Mahmoud,A. Radi,M. Kadastik,Mait Müntel,M. Raidal,Liis Rebane,A. Tiko,V. Azzolini,Paula Eerola,Giacomo Fedi,M. Voutilainen,Jaakko Härkönen,A. Heikkinen,V. Karimäki,Ritva Kinnunen,Matti J Kortelainen,Tapio Lampén,Kati Lassila-Perini,Sami Lehti,Tomas Lindén,Panja-Riina Luukka,Teppo Mäenpää,T. Peltola,Eija Tuominen,Jorma Tuominiemi,Esa Tuovinen,Donatella Ungaro,Lauri Wendland,Kukka Banzuzi,Arja Korpela,Tuure Tuuva,Marc Besancon,Somnath Choudhury,M. Dejardin,D. Denegri,B. Fabbro,J.L. Faure,F. Ferri,S Ganjour,A. Givernaud,P. Gras,P. Jarry,E. Locci,J. Malcles,Laurent Millischer,Aruna Nayak,J. Rander,A. Rosowsky,I. Shreyber,M. Titov,F. Beaudette,Lamia Benhabib,L. Bianchini,M.Bluj,Clementine Broutin,P. Busson,C. Charlot,Nadir Daci,Torsten Dahms,L. Dobrzynski,Maurice Haguenauer,P. Miné,Camelia Mironov,Matthew Nguyen,C. Ochando,P. Paganini,D. Sabes,R. Salerno,Yves Sirois,C. Veelken,A. Zabi,J.-L. Agram,J. Andrea,D. Bloch,David Bodin,J. M. Brom,Marco Cardaci,E. C. Chabert,C. Collard,Cristina Ferro,J.C Fontaine,D. Gelé,U Goerlach,Pierre Juillot,A.-C. Le Bihan,P. Van Hove,Farida Fassi,Damien Mercier,S. Beauceron,Nicolas Beaupere,O. Bondu,G. Boudoul,H. Brun,Julien Chasserat,D. Contardo,P. Depasse,H. El Mamouni,J. Fay,S. Gascon,Maxime Gouzevitch,B. Ille,T. Kurca,M. Lethuillier,L. Mirabito,S Perries,V. Sordini,Silvano Tosi,Yohann Tschudi,Patrice Verdier,Sébastien Viret,G. Anagnostou,Sarah Beranek,L. Feld,N. Heracleous,O. Hindrichs,Ruediger Jussen,K. Klein,Jennifer Merz,Andrey Ostapchuk,A. Perieanu,Frank Raupach,Jan Sammet,S. Schael,Daniel Sprenger,H. A. Weber,Bruno Wittmer,Metin Ata,Julien Caudron,D. Duchardt,M. Erdmann,R. Fischer,Thomas Hebbeker,C. Heidemann,K. Hoepfner,Dennis Klingebiel,P. Kreuzer,Joschka Lingemann,C. Magass,M. Merschmeyer,Arnd Meyer,Mark Olschewski,Paul Papacz,Holger Pieta,Hans Reithler,S. A. Schmitz,L. Sonnenschein,J. Steggemann,D. Teyssier,M. Weber,Michael Bontenackels,V. Cherepanov,M. Davids,Heiko Geenen,Matthias Geisler,W. Haj Ahmad,Felix Hoehle,Bastian Kargoll,T Kress,Yvonne Kuessel,A. Linn,A. Nowack,Lars Perchalla,O. Pooth,Jörg Rennefeld,Philip Sauerland,A. Stahl,M. Aldaya Martin,J. K. Behr,U. Behrens,Matthias Bergholz,A. Bethani,K Borras,Armin Burgmeier,A Çakir,L. Calligaris,A. J. Campbell,Elena Castro,F. Costanza,Dirk Dammann,G. Eckerlin,D Eckstein,D. J. Fischer,Gero Flucke,A Geiser,I. Glushkov,P. Gunnellini,Shiraz Habib,J. Hauk,Gregor Hellwig,M Kasemann,Panagiotis Katsas,C Kleinwort,Hannelies Kluge,A. Knutsson,E. Kuznetsova,W. Lange,B. Lutz,R. Mankel,Ihar Marfin,Markus Marienfeld,I. A. Melzer-Pellmann,A. B. Meyer,J. Mnich,A. Mussgiller,Jan Olzem,Hanno Perrey,Alexey Petrukhin,D. Pitzl,A. Raspereza,P. M. Ribeiro Cipriano,C. Riedl,Michele Rosin,Niladri Sen,A. Spiridonov,Matthias Stein,R. Walsh,C. Wissing,Christian Autermann,V. Blobel,Sergei Bobrovskyi,Jula Draeger,Holger Enderle,Joachim Erfle,Ulla Gebbert,T. Hermanns,R. S. Höing,Kolja Kaschube,Gordon Kaussen,H. Kirschenmann,R. Klanner,J. C. Lange,Benedikt Mura,Friederike Nowak,Niklas Pietsch,D. Rathjens,C. Sander,Hannes Schettler,P. Schleper,Eike Schlieckau,A. Schmidt,Torben Schum,M. Seidel,H. Stadie,J. Thomsen,C. Barth,Joram Berger,T. Chwalek,W. De Boer,Alexis Descroix,A. Dierlamm,Michael Feindt,Christoph Hackstein,F. Hartmann,Michael Heinrich,Hauke Held,K. H. Hoffmann,Simon Honc,J. R. Komaragiri,Daniel Martschei,S. Mueller,Martin Niegel,Oliver Oberst,Andreas Oehler,Jochen Ott,G. Quast,Klaus Rabbertz,Fedor Ratnikov,Natalia Ratnikova,Armin Scheurer,Frank-Peter Schilling,Gregory Schott,H. J. Simonis,F. M. Stober,Daniel Troendle,R. Ulrich,S. Wayand,T. Weiler,Manuel Zeise,G. Daskalakis,T. Geralis,Stilianos Kesisoglou,A. Kyriakis,D. Loukas,Ioannis Manolakos,A. Markou,Christos Markou,Charalampos Mavrommatis,Eleni Ntomari,L. Gouskos,T. J. Mertzimekis,A D Panagiotou,N. Saoulidou,I. Evangelou,P. Kokkas,N. Manthos,I. Papadopoulos,Vaios Patras,Gyorgy Bencze,D. 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Measurement of jet fragmentation into charged particles in pp and PbPb collisions at sqrt(s[NN])= 2.76 TeV

2012

Jet fragmentation in pp and PbPb collisions at a centre-of-mass energy of 2.76 TeV per nucleon pair was studied using data collected with the CMS detector at the LHC. Fragmentation functions are constructed using charged-particle tracks with transverse momenta pt > 4 GeV for dijet events with a leading jet of pt > 100 GeV. The fragmentation functions in PbPb events are compared to those in pp data as a function of collision centrality, as well as dijet-pt imbalance. Special emphasis is placed on the most central PbPb events including dijets with unbalanced momentum, indicative of energy loss of the hard scattered parent partons. The fragmentation patterns for both the leading and subleading jets in PbPb collisions agree with those seen in pp data at 2.76 TeV. The results provide evidence that, despite the large parton energy loss observed in PbPb collisions, the high-pt component of the fragmentation function evaluated with respect to the reconstructed jet momentum is not strongly modified in comparison to jet fragmentation in vacuum.

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