Jet and underlying event properties as a function of charged-particle multiplicity in proton–proton collisions at sqrt(s)= 7 TeV
Articolo
Data di Pubblicazione:
2013
Abstract:
Characteristics of multi-particle production in
proton-proton collisions at √s = 7 TeV are studied as
a function of the charged-particle multiplicity, Nch. The
produced particles are separated into two classes: those
belonging to jets and those belonging to the underlying
event. Charged particles are measured with pseudorapidity
|η| < 2.4 and transverse momentum pT > 0.25 GeV/c.
Jets are reconstructed from charged-particles only and required
to have pT > 5 GeV/c. The distributions of jet pT,
average pT of charged particles belonging to the underlying
event or to jets, jet rates, and jet shapes are presented
as functions of Nch and compared to the predictions of the
PYTHIA and HERWIG event generators. Predictions without
multi-parton interactions fail completely to describe the
Nch-dependence observed in the data. For increasing Nch,
PYTHIA systematically predicts higher jet rates and harder
pT spectra than seen in the data, whereas HERWIG shows
the opposite trends. At the highest multiplicity, the data–
model agreement is worse for most observables, indicating
the need for further tuning and/or new model ingredients.
Tipologia CRIS:
03A-Articolo su Rivista
Elenco autori:
S. Chatrchyan;V. Khachatryan;A. M. Sirunyan;A. Tumasyan;W. Adam;T. Bergauer;M. Dragicevic;J. Erö;C. Fabjan;M. Friedl;R. Frühwirth;V. M. Ghete;N. Hörmann;J. Hrubec;M. Jeitler;W. Kiesenhofer;V. Knünz;M. Krammer;I. Krätschmer;D. Liko;I. Mikulec;D. Rabady;B. Rahbaran;C. Rohringer;H. Rohringer;R. Schöfbeck;J. Strauss;A. Taurok;W. Treberer-Treberspurg;W. Waltenberger;C.-E. Wulz;V. Mossolov;N. Shumeiko;J. Suarez Gonzalez;S. Alderweireldt;M. Bansal;S. Bansal;T. Cornelis;E. A. Wolf;X. Janssen;A. Knutsson;S. Luyckx;L. Mucibello;S. Ochesanu;B. Roland;R. Rougny;Z. Staykova;H. Haevermaet;P. Mechelen;N. Remortel;A. Spilbeeck;F. Blekman;S. Blyweert;J. D’Hondt;A. Kalogeropoulos;J. Keaveney;S. Lowette;M. Maes;A. Olbrechts;S. Tavernier;W. Doninck;P. Mulders;G. P. Onsem;I. Villella;C. Caillol;B. Clerbaux;G. Lentdecker;L. Favart;A. P. R. Gay;T. Hreus;A. Léonard;P. E. Marage;A. Mohammadi;L. Perniè;T. Reis;T. Seva;L. Thomas;C. Vander Velde;P. Vanlaer;J. Wang;V. Adler;K. Beernaert;L. Benucci;A. Cimmino;S. Costantini;S. Dildick;G. Garcia;B. Klein;J. Lellouch;A. Marinov;J. Mccartin;A. A. Ocampo Rios;D. Ryckbosch;M. Sigamani;N. Strobbe;F. Thyssen;M. Tytgat;S. Walsh;E. Yazgan;N. Zaganidis;S. Basegmez;C. Beluffi;G. Bruno;R. Castello;A. Caudron;L. Ceard;G. G. Silveira;C. Delaere;T. du Pree;D. Favart;L. Forthomme;A. Giammanco;J. Hollar;P. Jez;V. Lemaitre;J. Liao;O. Militaru;C. Nuttens;D. Pagano;A. Pin;K. Piotrzkowski;A. Popov;M. Selvaggi;M. Vidal Marono;J. M. Vizan Garcia;N. Beliy;T. Caebergs;E. Daubie;G. H. Hammad;G. A. Alves;M. Correa Martins Junior;T. Martins;M. E. Pol;M. H. G. Souza;W. L. Aldá Júnior;W. Carvalho;J. Chinellato;A. Custódio;E. M. Costa;D. Jesus Damiao;C. Oliveira Martins;S. Fonseca De Souza;H. Malbouisson;M. Malek;D. Matos Figueiredo;L. Mundim;H. Nogima;W. L. Prado Da Silva;A. Santoro;A. Sznajder;E. J. Tonelli Manganote;A. Vilela Pereira;C. A. Bernardes;F. A. Dias;T. R. Fernandez Perez Tomei;E. M. Gregores;C. Lagana;P. G. Mercadante;S. F. Novaes;Sandra S. Padula;V. Genchev;P. Iaydjiev;S. Piperov;M. Rodozov;G. Sultanov;M. Vutova;A. Dimitrov;R. Hadjiiska;V. Kozhuharov;L. Litov;B. Pavlov;P. Petkov;J. G. Bian;G. M. Chen;H. S. Chen;C. H. Jiang;D. Liang;S. Liang;X. Meng;J. Tao;X. Wang;Z. Wang;C. Asawatangtrakuldee;Y. Ban;Y. Guo;Q. Li;W. Li;S. Liu;Y. Mao;S. J. Qian;D. Wang;L. Zhang;W. Zou;C. Avila;C. A. Carrillo Montoya;L. F. Chaparro Sierra;J. P. Gomez;B. Gomez Moreno;J. C. Sanabria;N. Godinovic;D. Lelas;R. Plestina;D. Polic;I. Puljak;Z. Antunovic;M. Kovac;V. Brigljevic;K. Kadija;J. Luetic;D. Mekterovic;S. Morovic;L. Tikvica;A. Attikis;G. Mavromanolakis;J. Mousa;C. Nicolaou;F. Ptochos;P. A. Razis;M. Finger;M. Finger;A. A. Abdelalim;Y. Assran;S. Elgammal;A. Ellithi Kamel;M. A. Mahmoud;A. Radi;M. Kadastik;M. Müntel;M. Murumaa;M. Raidal;L. Rebane;A. Tiko;P. Eerola;G. Fedi;M. Voutilainen;J. Härkönen;V. Karimäki;R. Kinnunen;M. J. Kortelainen;T. Lampén;K. Lassila-Perini;S. Lehti;T. Lindén;P. Luukka;T. Mäenpää;T. Peltola;E. Tuominen;J. Tuominiemi;E. Tuovinen;L. Wendland;T. Tuuva;M. Besancon;F. Couderc;M. Dejardin;D. Denegri;B. Fabbro;J. L. Faure;F. Ferri;S. Ganjour;A. Givernaud;P. Gras;G. Hamel de Monchenault;P. Jarry;E. Locci;J. Malcles;L. Millischer;A. Nayak;J. Rander;A. Rosowsky;M. Titov;S. Baffioni;F. Beaudette;L. Benhabib;M. Bluj;P. Busson;C. Charlot;N. Daci;T. Dahms;M. Dalchenko;L. Dobrzynski;A. Florent;R. Granier de Cassagnac;M. Haguenauer;P. Miné;C. Mironov;I. N. Naranjo;M. Nguyen;C. Ochando;P. Paganini;D. Sabes;R. Salerno;Y. Sirois;C. Veelken;A. Zabi;J.-L. Agram;J. Andrea;D. Bloch;J.-M. Brom;E. C. Chabert;C. Collard;E. Conte;F. Drouhin;J.-C. Fonta
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