Charged particle production in proton-proton collisions is studied with the LHCb detector at a centre-of-mass energy of root s = 7 TeV in different intervals of pseudorapidity eta. Charged particles are reconstructed close to the interaction region in the vertex detector, which provides high reconstruction efficiency in the eta ranges -2.5 < eta < -2.0 and 2.0 < eta < 4.5. The data were taken with a minimum bias trigger, only requiring one or more reconstructed tracks in the vertex detector. By selecting an event sample with at least one track with a transverse momentum greater than 1 GeV/c a hard QCD subsample is investigated. Several event generators are compared with the data; none are able to describe fully the multiplicity distributions or the charged particle density distribution as a function of eta. In general, the models underestimate charged particle production.
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Data di pubblicazione: | 2012 | |
Titolo: | Measurement of charged particle multiplicities in pp collisions at root s=7 TeV in the forward region | |
Autori: | R. Aaij;C. A. Beteta;B. Adeva;M. Adinolfi;C. Adrover;A. Affolder;Z. Ajaltouni;J. Albrecht;F. Alessio;M. Alexander;G. Alkhazov;P. A. Cartelle;A. A. Alves;S. Amato;Y. Amhis;J. Anderson;R. B. Appleby;O. A. Gutierrez;F. Archilli;L. Arrabito;A. Artamonov;M. Artuso;E. Aslanides;G. Auriemma;S. Bachmann;J. J. Back;D. S. Bailey;V. Balagura;W. Baldini;R. J. Barlow;C. Barschel;S. Barsuk;W. Barter;A. Bates;C. Bauer;T. Bauer;A. Bay;I. Bediaga;S. Belogurov;K. Belous;I. Belyaev;E. Ben-Haim;M. Benayoun;G. Bencivenni;S. Benson;J. Benton;R. Bernet;M. O. Bettler;M. v. Beuzekom;A. Bien;S. Bifani;T. Bird;A. Bizzeti;P. M. Bjornstad;T. Blake;F. Blanc;C. Blanks;J. Blouw;S. Blusk;A. Bobrov;V. Bocci;A. Bondar;N. Bondar;W. Bonivento;S. Borghi;A. Borgia;T. J. V.;C. Bozzi;T. Brambach;J. v. den;J. Bressieux;D. Brett;M. Britsch;T. Britton;N. H. Brook;H. Brown;A. Buechler-Germann;I. Burducea;A. Bursche;J. Buytaert;S. Cadeddu;O. Callot;M. Calvi;M. C. Gomez;A. Camboni;P. Campana;A. Carbone;G. Carboni;R. Cardinale;A. Cardini;L. Carson;K. C. Akiba;G. Casse;M. Cattaneo;C. Cauet;M. Charles;P. Charpentier;N. Chiapolini;K. Ciba;X. C. Vidal;G. Ciezarek;P. E. L.;M. Clemencic;H. V. Cliff;J. Closier;C. Coca;V. Coco;J. Cogan;P. Collins;A. Comerma-Montells;F. Constantin;G. Conti;A. Contu;A. Cook;M. Coombes;G. Corti;G. A. Cowan;R. Currie;B. D'Almagne;C. D'Ambrosio;P. David;P. N. Y.;I. D. Bonis;S. D. Capua;M. D. Cian;F. D. Lorenzi;J. M. De;L. D. Paula;P. D. Simone;D. Decamp;M. Deckenhoff;H. Degaudenzi;M. Deissenroth;L. D. Buono;C. Deplano;D. Derkach;O. Deschamps;F. Dettori;J. Dickens;H. Dijkstra;P. D. Batista;F. D. Bonal;S. Donleavy;F. Dordei;A. D. Suarez;D. Dossett;A. Dovbnya;F. Dupertuis;R. Dzhelyadin;A. Dziurda;S. Easo;U. Egede;V. Egorychev;S. Eidelman;D. V. Eijk;F. Eisele;S. Eisenhardt;R. Ekelhof;L. Eklund;C. Elsasser;D. Elsby;D. E. Pereira;L. Esteve;A. Falabella;E. Fanchini;C. Faerber;G. Fardell;C. Farinelli;S. Farry;V. Fave;V. F. Albor;M. Ferro-Luzzi;S. Filippov;C. Fitzpatrick;M. Fontana;F. Fontanelli;R. Forty;M. Frank;C. Frei;M. Frosini;S. Furcas;A. G. Torreira;D. Galli;M. Gandelman;P. Gandini;Y. Gao;J. C. Garnier;J. Garofoli;J. G. Tico;L. Garrido;D. Gascon;C. Gaspar;N. Gauvin;M. Gersabeck;T. Gershon;P. Ghez;V. Gibson;V. V. Gligorov;C. Gobel;D. Golubkov;A. Golutvin;A. Gomes;H. Gordon;M. G. Gandara;R. G. Diaz;L. A. G.;E. Grauges;G. Graziani;A. Grecu;E. Greening;S. Gregson;B. Gui;E. Gushchin;Y. Guz;T. Gys;G. Haefeli;C. Haen;S. C. Haines;T. Hampson;S. Hansmann-Menzemer;R. Harji;N. Harnew;J. Harrison;P. F. Harrison;J. He;V. Heijne;K. Hennessy;P. Henrard;J. A. H.;E. v. Herwijnen;E. Hicks;K. Holubyev;P. Hopchev;W. Hulsbergen;P. Hunt;T. Huse;R. S. Huston;D. Hutchcroft;D. Hynds;V. Iakovenko;P. Ilten;J. Imong;R. Jacobsson;A. Jaeger;M. J. Hussein;E. Jans;F. Jansen;P. Jaton;B. Jean-Marie;F. Jing;M. John;D. Johnson;C. R. Jones;B. Jost;M. Kaballo;S. Kandybei;M. Karacson;T. M. Karbach;J. Keaveney;I. R. Kenyon;U. Kerzel;T. Ketel;A. Keune;B. Khanji;Y. M. Kim;M. Knecht;P. Koppenburg;A. Kozlinskiy;L. Kravchuk;K. Kreplin;M. Kreps;G. Krocker;P. Krokovny;F. Kruse;K. Kruzelecki;M. Kucharczyk;T. Kvaratskheliya;V. N. La;D. Lacarrere;G. Lafferty;A. Lai;D. Lambert;R. W. Lambert;E. Lanciotti;G. Lanfranchi;C. Langenbruch;T. Latham;C. Lazzeroni;R. L. Gac;J. v. Leerdam;J. P. Lees;R. Lefevre;A. Leflat;J. Lefrancois;O. Leroy;T. Lesiak;L. Li;L. L. Gioi;M. Lieng;M. Liles;R. Lindner;C. Linn;B. Liu;G. Liu;J. H. Lopes;E. L. Asamar;N. Lopez-March;H. Lu;J. Luisier;A. M. Raighne;F. Machefert;I. V. Machikhiliyan;F. Maciuc;O. Maev;J. Magnin;S. Malde;R. M. D.;G. Manca;G. Mancinelli;N. Mangiafave;U. Marconi;R. Maerki;J. Marks;G. Martellotti;A. Martens;L. Martin;A. M. Sanchez;D. M. Santos;A. Massafferri;Z. Mathe;C. Matteuzzi;M. Matveev;E. Maurice;B. Maynard;A. Mazurov;G. McGregor;R. McNulty;C. Mclean;M. Meissner;M. Merk;J. Merkel;R. Messi;S. Miglioranzi;D. A. Milanes;M. N. Minard;J. M. Rodriguez;S. Monteil;D. Moran;P. Morawski;R. Mountain;I. Mous;F. Muheim;K. Mueller;R. Muresan;B. Muryn;B. Muster;M. Musy;J. Mylroie-Smith;P. Naik;T. Nakada;R. Nandakumar;I. Nasteva;M. Nedos;M. Needham;N. Neufeld;C. Nguyen-Mau;M. Nicol;V. Niess;N. Nikitin;A. Nomerotski;A. Novoselov;A. Oblakowska-Mucha;V. Obraztsov;S. Oggero;S. Ogilvy;O. Okhrimenko;R. Oldeman;M. Orlandea;J. M. O.;P. Owen;K. Pal;J. Palacios;A. Palano;M. Palutan;J. Panman;A. Papanestis;M. Pappagallo;C. Parkes;C. J. Parkinson;G. Passaleva;G. D. Patel;M. Patel;S. K. Paterson;G. N. Patrick;C. Patrignani;C. Pavel-Nicorescu;A. P. Alvarez;A. Pellegrino;G. Penso;M. P. Altarelli;S. Perazzini;D. L. Perego;E. P. Trigo;A. P. C.;P. Perret;M. Perrin-Terrin;G. Pessina;A. Petrella;A. Petrolini;A. Phan;E. P. Olloqui;B. P. Valls;B. Pietrzyk;T. Pilar;D. Pinci;R. Plackett;S. Playfer;M. P. Casasus;G. Polok;A. Poluektov;E. Polycarpo;D. Popov;B. Popovici;C. Potterat;A. Powell;T. d. Pree;J. Prisciandaro;V. Pugatch;A. P. Navarro;W. Qian;J. H. Rademacker;B. Rakotomiaramanana;M. S. Rangel;I. Raniuk;G. Raven;S. Redford;M. M. Reid;A. C. dos;S. Ricciardi;K. Rinnert;D. A. R.;P. Robbe;E. Rodrigues;F. Rodrigues;P. R. Perez;G. J. Rogers;S. Roiser;V. Romanovsky;M. Rosello;J. Rouvinet;T. Ruf;H. Ruiz;G. Sabatino;J. J. S.;N. Sagidova;P. Sail;B. Saitta;C. Salzmann;M. Sannino;R. Santacesaria;C. S. Rios;R. Santinelli;E. Santovetti;M. Sapunov;A. Sarti;C. Satriano;A. Satta;M. Savrie;D. Savrina;P. Schaack;M. Schiller;S. Schleich;M. Schlupp;M. Schmelling;B. Schmidt;O. Schneider;A. Schopper;M. H. Schune;R. Schwemmer;B. Sciascia;A. Sciubba;M. Seco;A. Semennikov;K. Senderowska;I. Sepp;N. Serra;J. Serrano;P. Seyfert;B. Shao;M. Shapkin;I. Shapoval;P. Shatalov;Y. Shcheglov;T. Shears;L. Shekhtman;O. Shevchenko;V. Shevchenko;A. Shires;R. S. Coutinho;T. Skwarnicki;A. C. Smith;N. A. Smith;E. Smith;K. Sobczak;F. J. P.;A. Solomin;F. Soomro;B. S. De;B. Spaan;A. Sparkes;P. Spradlin;F. Stagni;S. Stahl;O. Steinkamp;S. Stoica;S. Stone;B. Storaci;M. Straticiuc;U. Straumann;V. K. Subbiah;S. Swientek;M. Szczekowski;P. Szczypka;T. Szumlak;S. T'Jampens;E. Teodorescu;F. Teubert;C. Thomas;E. Thomas;J. v. Tilburg;V. Tisserand;M. Tobin;S. Topp-Joergensen;N. Torr;E. Tournefier;M. T. Tran;A. Tsaregorodtsev;N. Tuning;M. U. Garcia;A. Ukleja;P. Urquijo;U. Uwer;V. Vagnoni;G. Valenti;R. V. Gomez;P. V. Regueiro;S. Vecchi;J. J. Velthuis;M. Veltri;B. Viaud;I. Videau;X. Vilasis-Cardona;J. Visniakov;A. Vollhardt;D. Volyanskyy;D. Voong;A. Vorobyev;H. Voss;S. Wandernoth;J. Wang;D. R. Ward;N. K. Watson;A. D. Webber;D. Websdale;M. Whitehead;D. Wiedner;L. Wiggers;G. Wilkinson;M. P. Williams;M. Williams;F. F. Wilson;J. Wishahi;M. Witek;W. Witzeling;S. A. Wotton;K. Wyllie;Y. Xie;F. Xing;Z. Xing;Z. Yang;R. Young;O. Yushchenko;M. Zavertyaev;F. Zhang;L. Zhang;W. C. Zhang;Y. Zhang;A. Zhelezov;L. Zhong;E. Zverev;A. Zvyagin | |
Rivista: | THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS | |
Parole Chiave: | DECAY | |
Abstract: | Charged particle production in proton-proton collisions is studied with the LHCb detector at a centre-of-mass energy of root s = 7 TeV in different intervals of pseudorapidity eta. Charged particles are reconstructed close to the interaction region in the vertex detector, which provides high reconstruction efficiency in the eta ranges -2.5 < eta < -2.0 and 2.0 < eta < 4.5. The data were taken with a minimum bias trigger, only requiring one or more reconstructed tracks in the vertex detector. By selecting an event sample with at least one track with a transverse momentum greater than 1 GeV/c a hard QCD subsample is investigated. Several event generators are compared with the data; none are able to describe fully the multiplicity distributions or the charged particle density distribution as a function of eta. In general, the models underestimate charged particle production. | |
Digital Object Identifier (DOI): | 10.1140/epjc/s10052-012-1947-8 | |
Handle: | http://hdl.handle.net/11392/1893384 | |
Appare nelle tipologie: | 03.1 Articolo su rivista |