Event-by-event fluctuations of the mean trans- verse momentum of charged particles produced in pp colli- sions at √s = 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at √sNN = 2.76 TeV are studied as a function of the charged- particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emis- sion are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral Pb–Pb data exhibit a sim- ilar multiplicity dependence as that observed in pp. In central Pb–Pb, the results deviate from this trend, featuring a signif- icant reduction of the fluctuation strength. The results in Pb– Pb are in qualitative agreement with previous measurements in Au–Au at lower collision energies and with expectations from models that incorporate collective phenomena.

Event-by-event mean p_T fluctuations in pp and Pb–Pb collisions at the LHC

ARNALDI, Roberta;BALA, RENU;BEOLE', Stefania;BERZANO, DARIO CARLO DOMENICO;L. Bianchi;BOTTA, Elena;BRUNA, ELENA;BUFALINO, STEFANIA;CORRALES MORALES, YASSER;FERRETTI, Alessandro;GAGLIARDI, Martino;GALLIO, Mauro;INNOCENTI, GIAN MICHELE;LATTUCA, ALESSANDRA;MASERA, Massimo;MILANO, LEONARDO;PUCCIO, MAXIMILIANO;RAMELLO, Luciano;RIVETTI, Angelo;RUSSO, RICCARDO;SCOMPARIN, ENRICO;VALLERO, Sara;VERCELLIN, Ermanno;
2014-01-01

Abstract

Event-by-event fluctuations of the mean trans- verse momentum of charged particles produced in pp colli- sions at √s = 0.9, 2.76 and 7 TeV, and Pb–Pb collisions at √sNN = 2.76 TeV are studied as a function of the charged- particle multiplicity using the ALICE detector at the LHC. Dynamical fluctuations indicative of correlated particle emis- sion are observed in all systems. The results in pp collisions show little dependence on collision energy. The Monte Carlo event generators PYTHIA and PHOJET are in qualitative agreement with the data. Peripheral Pb–Pb data exhibit a sim- ilar multiplicity dependence as that observed in pp. In central Pb–Pb, the results deviate from this trend, featuring a signif- icant reduction of the fluctuation strength. The results in Pb– Pb are in qualitative agreement with previous measurements in Au–Au at lower collision energies and with expectations from models that incorporate collective phenomena.
2014
74
3077
3077
mean pT fluctuation; PP COLLISIONS; Pb-Pb collisions
B. Abelev;J. Adam;D. Adamová;M. M. Aggarwal;G. Aglieri Rinella;M. Agnello;A. Agostinelli;N. Agrawal;Z. Ahammed;N. Ahmad;I. Ahmed;S. U. Ahn;S. A. Ahn;I. Aimo;S. Aiola;M. Ajaz;A. Akindinov;S. N. Alam;D. Aleksandrov;B. Alessandro;D. Alexandre;A. Alici;A. Alkin;J. Alme;T. Alt;S. Altinpinar;I. Altsybeev;C. Alves Garcia Prado;C. Andrei;A. Andronic;V. Anguelov;J. Anielski;T. Antičić;F. Antinori;P. Antonioli;L. Aphecetche;H. Appelshäuser;S. Arcelli;N. Armesto;R. Arnaldi;T. Aronsson;I. C. Arsene;M. Arslandok;A. Augustinus;R. Averbeck;T. C. Awes;M. D. Azmi;M. Bach;A. Badalà;Y. W. Baek;S. Bagnasco;R. Bailhache;R. Bala;A. Baldisseri;F. Baltasar Dos Santos Pedrosa;R. C. Baral;R. Barbera;F. Barile;G. G. Barnaföldi;L. S. Barnby;V. Barret;J. Bartke;M. Basile;N. Bastid;S. Basu;B. Bathen;G. Batigne;A. Batista Camejo;B. Batyunya;P. C. Batzing;C. Baumann;I. G. Bearden;H. Beck;C. Bedda;N. K. Behera;I. Belikov;F. Bellini;R. Bellwied;E. Belmont-Moreno;R. Belmont;V. Belyaev;G. Bencedi;S. Beole;I. Berceanu;A. Bercuci;Y. Berdnikov;D. Berenyi;M. E. Berger;R. A. Bertens;D. Berzano;L. Betev;A. Bhasin;I. R. Bhat;A. K. Bhati;B. Bhattacharjee;J. Bhom;L. Bianchi;N. Bianchi;C. Bianchin;J. Bielčík;J. Bielčíková;A. Bilandzic;S. Bjelogrlic;F. Blanco;D. Blau;C. Blume;F. Bock;A. Bogdanov;H. Bøggild;M. Bogolyubsky;F. V. Böhmer;L. Boldizsár;M. Bombara;J. Book;H. Borel;A. Borissov;M. Borri;F. Bossú;M. Botje;E. Botta;S. Böttger;P. Braun-Munzinger;M. Bregant;T. Breitner;T. A. Broker;T. A. Browning;M. Broz;E. Bruna;G. E. Bruno;D. Budnikov;H. Buesching;S. Bufalino;P. Buncic;O. Busch;Z. Buthelezi;D. Caffarri;X. Cai;H. Caines;L. Calero Diaz;A. Caliva;E. Calvo Villar;P. Camerini;F. Carena;W. Carena;J. Castillo Castellanos;E. A. R. Casula;V. Catanescu;C. Cavicchioli;C. Ceballos Sanchez;J. Cepila;P. Cerello;B. Chang;S. Chapeland;J. L. Charvet;S. Chattopadhyay;S. Chattopadhyay;V. Chelnokov;M. Cherney;C. Cheshkov;B. Cheynis;V. Chibante Barroso;D. D. Chinellato;P. Chochula;M. Chojnacki;S. Choudhury;P. Christakoglou;C. H. Christensen;P. Christiansen;T. Chujo;S. U. Chung;C. Cicalo;L. Cifarelli;F. Cindolo;J. Cleymans;F. Colamaria;D. Colella;A. Collu;M. Colocci;G. Conesa Balbastre;Z. Conesa del Valle;M. E. Connors;J. G. Contreras;T. M. Cormier;Y. Corrales Morales;P. Cortese;I. Cortés Maldonado;M. R. Cosentino;F. Costa;P. Crochet;R. Cruz Albino;E. Cuautle;L. Cunqueiro;A. Dainese;R. Dang;A. Danu;D. Das;I. Das;K. Das;S. Das;A. Dash;S. Dash;S. De;H. Delagrange;A. Deloff;E. Dénes;G. D’Erasmo;A. De Caro;G. de Cataldo;J. de Cuveland;A. De Falco;D. De Gruttola;N. De Marco;S. De Pasquale;R. de Rooij;M. A. Diaz Corchero;T. Dietel;P. Dillenseger;R. Divià;D. Di Bari;S. Di Liberto;A. Di Mauro;P. Di Nezza;Ø. Djuvsland;A. Dobrin;T. Dobrowolski;D. Domenicis Gimenez;B. Dönigus;O. Dordic;S. Dørheim;A. K. Dubey;A. Dubla;L. Ducroux;P. Dupieux;A. K. Dutta Majumdar;T. E. Hilden;R. J. Ehlers;D. Elia;H. Engel;B. Erazmus;H. A. Erdal;D. Eschweiler;B. Espagnon;M. Esposito;M. Estienne;S. Esumi;D. Evans;S. Evdokimov;D. Fabris;J. Faivre;D. Falchieri;A. Fantoni;M. Fasel;D. Fehlker;L. Feldkamp;D. Felea;A. Feliciello;G. Feofilov;J. Ferencei;A. Fernández Téllez;E. G. Ferreiro;A. Ferretti;A. Festanti;J. Figiel;M. A. S. Figueredo;S. Filchagin;D. Finogeev;F. M. Fionda;E. M. Fiore;E. Floratos;M. Floris;S. Foertsch;P. Foka;S. Fokin;E. Fragiacomo;A. Francescon;U. Frankenfeld;U. Fuchs;C. Furget;A. Furs;M. Fusco Girard;J. J. Gaardhøje;M. Gagliardi;A. M. Gago;M. Gallio;D. R. Gangadharan;P. Ganoti;C. Gao;C. Garabatos;E. Garcia-Solis;C. Gargiulo;I. Garishvili;J. Gerhard;M. Germain;A. Gheata;M. Gheata;B. Ghidini;P. Ghosh;S. K. Ghosh;P. Gianotti;P. Giubellino;E. Gladysz-Dziadus;P. Glässel;A. Gomez Ramirez;P. González-Zamora;S. Gorbunov;L. Görlich;S. Gotovac;L. K. Graczykowski;A. Grelli;A. Grigoras;C. Grigoras;V. Grigoriev;A. Grigoryan;S. Grigoryan;B. Grinyov;N. Grion;J. F. Grosse-Oetringhaus;J.-Y. Grossiord;R. Grosso;F. Guber;R. Guernane;B. Guerzoni;M. Guilbaud;K. Gulbrandsen;H. Gulkanyan;M. Gumbo;T. Gunji;A. Gupta;R. Gupta;K. H. Khan;R. Haake;Ø. Haaland;C. Hadjidakis;M. Haiduc;H. Hamagaki;G. Hamar;L. D. Hanratty;A. Hansen;J. W. Harris;H. Hartmann;A. Harton;D. Hatzifotiadou;S. Hayashi;S. T. Heckel;M. Heide;H. Helstrup;A. Herghelegiu;G. Herrera Corral;B. A. Hess;K. F. Hetland;B. Hippolyte;J. Hladky;P. Hristov;M. Huang;T. J. Humanic;N. Hussain;T. Hussain;D. Hutter;D. S. Hwang;R. Ilkaev;I. Ilkiv;M. Inaba;G. M. Innocenti;C. Ionita;M. Ippolitov;M. Irfan;M. Ivanov;V. Ivanov;A. Jachołkowski;P. M. Jacobs;C. Jahnke;H. J. Jang;M. A. Janik;P. H. S. Y. Jayarathna;C. Jena;S. Jena;R. T. Jimenez Bustamante;P. G. Jones;H. Jung;A. Jusko;V. Kadyshevskiy;P. Kalinak;A. Kalweit;J. Kamin;J. H. Kang;V. Kaplin;S. Kar;A. Karasu Uysal;O. Karavichev;T. Karavicheva;E. Karpechev;U. Kebschull;R. Keidel;D. L. D. Keijdener;M. Keil SVN;M. M. Khan;P. Khan;S. A. Khan;A. Khanzadeev;Y. Kharlov;B. Kileng;B. Kim;D. W. Kim;D. J. Kim;J. S. Kim;M. Kim;M. Kim;S. Kim;T. Kim;S. Kirsch;I. Kisel;S. Kiselev;A. Kisiel;G. Kiss;J. L. Klay;J. Klein;C. Klein-Bösing;A. Kluge;M. L. Knichel;A. G. Knospe;C. Kobdaj;M. Kofarago;M. K. Köhler;T. Kollegger;A. Kolojvari;V. Kondratiev;N. Kondratyeva;A. Konevskikh;V. Kovalenko;M. Kowalski;S. Kox;G. Koyithatta Meethaleveedu;J. Kral;I. Králik;A. Kravčáková;M. Krelina;M. Kretz;M. Krivda;F. Krizek;E. Kryshen;M. Krzewicki;V. Kučera;Y. Kucheriaev;T. Kugathasan;C. Kuhn;P. G. Kuijer;I. Kulakov;J. Kumar;P. Kurashvili;A. Kurepin;A. B. Kurepin;A. Kuryakin;S. Kushpil;M. J. Kweon;Y. Kwon;P. Ladron de Guevara;C. Lagana Fernandes;I. Lakomov;R. Langoy;C. Lara;A. Lardeux;A. Lattuca;S. L. La Pointe;P. La Rocca;R. Lea;L. Leardini;G. R. Lee;I. Legrand;J. Lehnert;R. C. Lemmon;V. Lenti;E. Leogrande;M. Leoncino;I. León Monzón;P. Lévai;S. Li;J. Lien;R. Lietava;S. Lindal;V. Lindenstruth;C. Lippmann;M. A. Lisa;H. M. Ljunggren;D. F. Lodato;P. I. Loenne;V. R. Loggins;V. Loginov;D. Lohner;C. Loizides;X. Lopez;E. López Torres;X.-G. Lu;P. Luettig;M. Lunardon;G. Luparello;R. Ma;A. Maevskaya;M. Mager;D. P. Mahapatra;S. M. Mahmood;A. Maire;R. D. Majka;M. Malaev;I. Maldonado Cervantes;L. Malinina;D. Mal’Kevich;P. Malzacher;A. Mamonov;L. Manceau;V. Manko;F. Manso;V. Manzari;M. Marchisone;J. Mareš;G. V. Margagliotti;A. Margotti;A. Marín;C. Markert;M. Marquard;I. Martashvili;N. A. Martin;P. Martinengo;M. I. Martínez;G. Martínez García;J. Martin Blanco;Y. Martynov;A. Mas;S. Masciocchi;M. Masera;A. Masoni;L. Massacrier;A. Mastroserio;A. Matyja;C. Mayer;J. Mazer;M. A. Mazzoni;D. Mcdonald;F. Meddi;A. Menchaca-Rocha;E. Meninno;J. Mercado Pérez;M. Meres;Y. Miake;K. Mikhaylov;L. Milano;J. Milosevic;A. Mischke;A. N. Mishra;D. Miśkowiec;J. Mitra;C. M. Mitu;J. Mlynarz;N. Mohammadi;B. Mohanty;L. Molnar;L. Montaño Zetina;E. Montes;M. Morando;D. A. Moreira De Godoy;S. Moretto;A. Morreale;A. Morsch;V. Muccifora;E. Mudnic;D. Mühlheim;S. Muhuri;M. Mukherjee;H. Müller;M. G. Munhoz;S. Murray;L. Musa;J. Musinsky;B. K. Nandi;R. Nania;E. Nappi;C. Nattrass;K. Nayak;T. K. Nayak;S. Nazarenko;A. Nedosekin;M. Nicassio;M. Niculescu;J. Niedziela;B. S. Nielsen;S. Nikolaev;S. Nikulin;V. Nikulin;B. S. Nilsen;F. Noferini;P. Nomokonov;G. Nooren;J. Norman;A. Nyanin;J. Nystrand;H. Oeschler;S. Oh;S. K. Oh;A. Okatan;L. Olah;J. Oleniacz;A. C. Oliveira Da Silva;J. Onderwaater;C. Oppedisano;A. Ortiz Velasquez;A. Oskarsson;J. Otwinowski;K. Oyama;M. Ozdemir;P. Sahoo;Y. Pachmayer;M. Pachr;P. Pagano;G. Paić;C. Pajares;S. K. Pal;A. Palmeri;D. Pant;V. Papikyan;G. S. Pappalardo;P. Pareek;W. J. Park;S. Parmar;A. Passfeld;D. I. Patalakha;V. Paticchio;B. Paul;T. Pawlak;T. Peitzmann;H. Pereira Da Costa;E. Pereira De Oliveira Filho;D. Peresunko;C. E. Pérez Lara;A. Pesci;V. Peskov;Y. Pestov;V. Petráček;M. Petran;M. Petris;M. Petrovici;C. Petta;S. Piano;M. Pikna;P. Pillot;O. Pinazza;L. Pinsky;D. B. Piyarathna;M. Płoskoń;M. Planinic;J. Pluta;S. Pochybova;P. L. M. Podesta-Lerma;M. G. Poghosyan;E. H. O. Pohjoisaho;B. Polichtchouk;N. Poljak;A. Pop;S. Porteboeuf-Houssais;J. Porter;B. Potukuchi;S. K. Prasad;R. Preghenella;F. Prino;C. A. Pruneau;I. Pshenichnov;M. Puccio;G. Puddu;P. Pujahari;V. Punin;J. Putschke;H. Qvigstad;A. Rachevski;S. Raha;S. Rajput;J. Rak;A. Rakotozafindrabe;L. Ramello;R. Raniwala;S. Raniwala;S. S. Räsänen;B. T. Rascanu;D. Rathee;A. W. Rauf;V. Razazi;K. F. Read;J. S. Real;K. Redlich;R. J. Reed;A. Rehman;P. Reichelt;M. Reicher;F. Reidt;R. Renfordt;A. R. Reolon;A. Reshetin;F. Rettig;J.-P. Revol;K. Reygers;V. Riabov;R. A. Ricci;T. Richert;M. Richter;P. Riedler;W. Riegler;F. Riggi;A. Rivetti;E. Rocco;M. Rodríguez Cahuantzi;A. Rodriguez Manso;K. Røed;E. Rogochaya;S. Rohni;D. Rohr;D. Röhrich;R. Romita;F. Ronchetti;L. Ronflette;P. Rosnet;A. Rossi;F. Roukoutakis;A. Roy;C. Roy;P. Roy;A. J. Rubio Montero;R. Rui;R. Russo;E. Ryabinkin;Y. Ryabov;A. Rybicki;S. Sadovsky;K. Šafařík;B. Sahlmuller;R. Sahoo;P. K. Sahu;J. Saini;S. Sakai;C. A. Salgado;J. Salzwedel;S. Sambyal;V. Samsonov;X. Sanchez Castro;F. J. Sánchez Rodríguez;L. Šándor;A. Sandoval;M. Sano;G. Santagati;D. Sarkar;E. Scapparone;F. Scarlassara;R. P. Scharenberg;C. Schiaua;R. Schicker;C. Schmidt;H. R. Schmidt;S. Schuchmann;J. Schukraft;M. Schulc;T. Schuster;Y. Schutz;K. Schwarz;K. Schweda;G. Scioli;E. Scomparin;R. Scott;G. Segato;J. E. Seger;Y. Sekiguchi;I. Selyuzhenkov;K. Senosi;J. Seo;E. Serradilla;A. Sevcenco;A. Shabetai;G. Shabratova;R. Shahoyan;A. Shangaraev;A. Sharma;N. Sharma;S. Sharma;K. Shigaki;K. Shtejer;Y. Sibiriak;S. Siddhanta;T. Siemiarczuk;D. Silvermyr;C. Silvestre;G. Simatovic;R. Singaraju;R. Singh;S. Singha;V. Singhal;B. C. Sinha;T. Sinha;B. Sitar;M. Sitta;T. B. Skaali;K. Skjerdal;M. Slupecki;N. Smirnov;R. J. M. Snellings;C. Søgaard;R. Soltz;J. Song;M. Song;F. Soramel;S. Sorensen;M. Spacek;E. Spiriti;I. Sputowska;M. Spyropoulou-Stassinaki;B. K. Srivastava;J. Stachel;I. Stan;G. Stefanek;M. Steinpreis;E. Stenlund;G. Steyn;J. H. Stiller;D. Stocco;M. Stolpovskiy;P. Strmen;A. A. P. Suaide;T. Sugitate;C. Suire;M. Suleymanov;R. Sultanov;M. Šumbera;T. J. M. Symons;A. Szabo;A. Szanto de Toledo;I. Szarka;A. Szczepankiewicz;M. Szymanski;J. Takahashi;M. A. Tangaro;J. D. Tapia Takaki;A. Tarantola Peloni;A. Tarazona Martinez;M. Tariq;M. G. Tarzila;A. Tauro;G. Tejeda Muñoz;A. Telesca;K. Terasaki;C. Terrevoli;J. Thäder;D. Thomas;R. Tieulent;A. R. Timmins;A. Toia;V. Trubnikov;W. H. Trzaska;T. Tsuji;A. Tumkin;R. Turrisi;T. S. Tveter;K. Ullaland;A. Uras;G. L. Usai;M. Vajzer;M. Vala;L. Valencia Palomo;S. Vallero;P. Vande Vyvre;J. Van Der Maarel;J. W. Van Hoorne;M. van Leeuwen;A. Vargas;M. Vargyas;R. Varma;M. Vasileiou;A. Vasiliev;V. Vechernin;M. Veldhoen;A. Velure;M. Venaruzzo;E. Vercellin;S. Vergara Limón;R. Vernet;M. Verweij;L. Vickovic;G. Viesti;J. Viinikainen;Z. Vilakazi;O. Villalobos Baillie;A. Vinogradov;L. Vinogradov;Y. Vinogradov;T. Virgili;V. Vislavicius;Y. P. Viyogi;A. Vodopyanov;M. A. Völkl;K. Voloshin;S. A. Voloshin;G. Volpe;B. von Haller;I. Vorobyev;D. Vranic;J. Vrláková;B. Vulpescu;A. Vyushin;B. Wagner;J. Wagner;V. Wagner;M. Wang;Y. Wang;D. Watanabe;M. Weber;S. G. Weber;J. P. Wessels;U. Westerhoff;J. Wiechula;J. Wikne;M. Wilde;G. Wilk;J. Wilkinson;M. C. S. Williams;B. Windelband;M. Winn;C. G. Yaldo;Y. Yamaguchi;H. Yang;P. Yang;S. Yang;S. Yano;S. Yasnopolskiy;J. Yi;Z. Yin;I.-K. Yoo;I. Yushmanov;V. Zaccolo;C. Zach;A. Zaman;C. Zampolli;S. Zaporozhets;A. Zarochentsev;P. Závada;N. Zaviyalov;H. Zbroszczyk;I. S. Zgura;M. Zhalov;H. Zhang;X. Zhang;Y. Zhang;C. Zhao;N. Zhigareva;D. Zhou;F. Zhou;Y. Zhou;Zhou Zhuo;H. Zhu;J. Zhu;X. Zhu;A. Zichichi;A. Zimmermann;M. B. Zimmermann;G. Zinovjev;Y. Zoccarato;M. Zyzak
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