The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for anti-p over p, anti-Lambda over Lambda, anti-Xi+ over Xi− and anti-Omega+ over Omega- in pp collisions at √s = 0.9, 2.76 and 7 TeV, measured with the ALICE detector at the LHC, are reported. Within the experimental uncertainties and ranges covered by our measurement, these ratios are independent of rapidity, transverse momentum and multiplicity for all measured energies. The results are compared to expectations from event generators, such as PYTHIA and HIJING/B, that are used to model the particle production in pp collisions. The energy dependence of anti-p/p, anti-Lambda/Lambda, antiXi+/Xi- and anti-Omega+/Omega- , reaching values compatible with unity for √s = 7 TeV, complement the earlier anti-p/p measurement of ALICE. These dependencies can be described by exchanges with the Regge-trajectory intercept of alpha_J ≈ 0.5, which are suppressed with increasing rapidity interval Delta_y. Any significant contribution of an exchange not suppressed at large Delat_y (reached at LHC energies) is disfavoured
Mid-rapidity anti-baryon to baryon ratios in pp collisions at sqrt(s) = 0.9, 2.76 and 7 TeV measured by ALICE / E. Abbas;B. Abelev;J. Adam;D. Adamová;A. M. Adare;M. M. Aggarwal;G. Aglieri Rinella;M. Agnello;A. G. Agocs;A. Agostinelli;Z. Ahammed;N. Ahmad;A. Ahmad Masoodi;I. Ahmed;S. A. Ahn;S. U. Ahn;I. Aimo;M. Ajaz;A. Akindinov;D. Aleksandrov;B. Alessandro;A. Alici;A. Alkin;E. Almaráz Aviña;J. Alme;T. Alt;V. Altini;S. Altinpinar;I. Altsybeev;C. Andrei;A. Andronic;V. Anguelov;J. Anielski;C. Anson;T. Antičić;F. Antinori;P. Antonioli;L. Aphecetche;H. Appelshäuser;N. Arbor;S. Arcelli;A. Arend;N. Armesto;R. Arnaldi;T. Aronsson;I. C. Arsene;M. Arslandok;A. Asryan;A. Augustinus;R. Averbeck;T. C. Awes;J. Äystö;M. D. Azmi;M. Bach;A. Badalà;Y. W. Baek;R. Bailhache;R. Bala;A. Baldisseri;F. Baltasar Dos Santos Pedrosa;J. Bán;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;B. Batyunya;P. C. Batzing;C. Baumann;I. G. Bearden;H. Beck;N. K. Behera;I. Belikov;F. Bellini;R. Bellwied;E. Belmont-Moreno;G. Bencedi;S. Beole;I. Berceanu;A. Bercuci;Y. Berdnikov;D. Berenyi;A. A. E. Bergognon;R. A. Bertens;D. Berzano;L. Betev;A. Bhasin;A. K. Bhati;J. Bhom;N. Bianchi;L. Bianchi;C. Bianchin;J. Bielčík;J. Bielčíková;A. Bilandzic;S. Bjelogrlic;F. Blanco;F. Blanco;D. Blau;C. Blume;M. Boccioli;S. Böttger;A. Bogdanov;H. Bøggild;M. Bogolyubsky;L. Boldizsár;M. Bombara;J. Book;H. Borel;A. Borissov;F. Bossú;M. Botje;E. Botta;E. Braidot;P. Braun-Munzinger;M. Bregant;T. Breitner;T. A. Broker;T. A. Browning;M. Broz;R. Brun;E. Bruna;G. E. Bruno;D. Budnikov;H. Buesching;S. Bufalino;P. Buncic;O. Busch;Z. Buthelezi;D. Caffarri;X. Cai;H. Caines;E. Calvo Villar;P. Camerini;V. Canoa Roman;G. Cara Romeo;F. Carena;W. Carena;N. Carlin Filho;F. Carminati;A. Casanova Díaz;J. Castillo Castellanos;J. F. Castillo Hernandez;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;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;G. Conesa Balbastre;Z. Conesa del Valle;M. E. Connors;G. Contin;J. G. Contreras;T. M. Cormier;Y. Corrales Morales;P. Cortese;I. Cortés Maldonado;M. R. Cosentino;F. Costa;M. E. Cotallo;E. Crescio;P. Crochet;E. Cruz Alaniz;R. Cruz Albino;E. Cuautle;L. Cunqueiro;A. Dainese;R. Dang;A. Danu;K. Das;S. Das;D. Das;I. Das;S. Dash;A. Dash;S. De;G. O. V. Barros;A. Caro;G. Cataldo;J. Cuveland;A. Falco;D. Gruttola;H. Delagrange;A. Deloff;N. Marco;E. Dénes;S. Pasquale;A. Deppman;G. D Erasmo;R. Rooij;M. A. Diaz Corchero;D. Bari;T. Dietel;C. Giglio;S. Liberto;A. Mauro;P. Nezza;R. Divià;Ø. Djuvsland;A. Dobrin;T. Dobrowolski;B. Dönigus;O. Dordic;O. Driga;A. K. Dubey;A. Dubla;L. Ducroux;P. Dupieux;A. K. Dutta Majumdar;D. Elia;D. Emschermann;H. Engel;B. Erazmus;H. A. Erdal;D. Eschweiler;B. Espagnon;M. Estienne;S. Esumi;D. Evans;S. Evdokimov;G. Eyyubova;D. Fabris;J. Faivre;D. Falchieri;A. Fantoni;M. Fasel;D. Fehlker;L. Feldkamp;D. Felea;A. Feliciello;B. Fenton-Olsen;G. Feofilov;A. Fernández Téllez;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;M. Fusco Girard;J. J. Gaardhøje;M. Gagliardi;A. Gago;M. Gallio;D. R. Gangadharan;P. Ganoti;C. Garabatos;E. Garcia-Solis;C. Gargiulo;I. Garishvili;J. Gerhard;M. Germain;C. Geuna;A. Gheata;M. Gheata;B. Ghidini;P. Ghosh;P. Gianotti;M. R. Girard;P. Giubellino;E. Gladysz-Dziadus;P. Glässel;R. Gomez;E. G. Ferreiro;L. H. González-Trueba;P. González-Zamora;S. Gorbunov;A. Goswami;S. Gotovac;L. K. Graczykowski;R. Grajcarek;A. Grelli;C. Grigoras;A. Grigoras;V. Grigoriev;S. Grigoryan;A. Grigoryan;B. Grinyov;N. Grion;P. Gros;J. F. Grosse-Oetringhaus;J.-Y. Grossiord;R. Grosso;F. Guber;R. Guernane;B. Guerzoni;M. Guilbaud;K. Gulbrandsen;H. Gulkanyan;T. Gunji;A. Gupta;R. Gupta;R. Haake;Ø. Haaland;C. Hadjidakis;M. Haiduc;H. Hamagaki;G. Hamar;B. H. Han;L. D. Hanratty;A. Hansen;Z. Harmanová-Tóthová;J. W. Harris;M. Hartig;A. Harton;D. Hatzifotiadou;S. Hayashi;A. Hayrapetyan;S. T. Heckel;M. Heide;H. Helstrup;A. Herghelegiu;G. Herrera Corral;N. Herrmann;B. A. Hess;K. F. Hetland;B. Hicks;B. Hippolyte;Y. Hori;P. Hristov;I. Hřivnáčová;M. Huang;T. J. Humanic;D. S. Hwang;R. Ichou;R. Ilkaev;I. Ilkiv;M. Inaba;E. Incani;P. G. Innocenti;G. M. Innocenti;M. Ippolitov;M. Irfan;C. Ivan;M. Ivanov;A. Ivanov;V. Ivanov;O. Ivanytskyi;A. Jachołkowski;P. M. Jacobs;C. Jahnke;H. J. Jang;M. A. Janik;P. H. S. Y. Jayarathna;S. Jena;D. M. Jha;R. T. Jimenez Bustamante;P. G. Jones;H. Jung;A. Jusko;A. B. Kaidalov;S. Kalcher;P. Kaliňák;T. Kalliokoski;A. Kalweit;J. H. Kang;V. Kaplin;S. Kar;A. Karasu Uysal;O. Karavichev;T. Karavicheva;E. Karpechev;A. Kazantsev;U. Kebschull;R. Keidel;B. Ketzer;P. Khan;K. H. Khan;S. A. Khan;M. M. Khan;A. Khanzadeev;Y. Kharlov;B. Kileng;D. W. Kim;T. Kim;M. Kim;M. Kim;S. Kim;B. Kim;J. S. Kim;J. H. Kim;D. J. Kim;S. Kirsch;I. Kisel;S. Kiselev;A. Kisiel;J. L. Klay;J. Klein;C. Klein-Bösing;M. Kliemant;A. Kluge;M. L. Knichel;A. G. Knospe;M. K. Köhler;T. Kollegger;A. Kolojvari;M. Kompaniets;V. Kondratiev;N. Kondratyeva;A. Konevskikh;V. Kovalenko;M. Kowalski;S. Kox;G. Koyithatta Meethaleveedu;J. Kral;I. Králik;F. Kramer;A. Kravčáková;M. Krelina;M. Kretz;M. Krivda;F. Krizek;M. Krus;E. Kryshen;M. Krzewicki;V. Kucera;Y. Kucheriaev;T. Kugathasan;C. Kuhn;P. G. Kuijer;I. Kulakov;J. Kumar;P. Kurashvili;A. Kurepin;A. B. Kurepin;A. Kuryakin;S. Kushpil;V. Kushpil;H. Kvaerno;M. J. Kweon;Y. Kwon;P. Ladrón de Guevara;I. Lakomov;R. Langoy;S. L. Pointe;C. Lara;A. Lardeux;P. Rocca;R. Lea;M. Lechman;S. C. Lee;G. R. Lee;I. Legrand;J. Lehnert;R. C. Lemmon;M. Lenhardt;V. Lenti;H. León;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;K. K. Loo;X. Lopez;E. López Torres;G. Løvhøiden;X.-G. Lu;P. Luettig;M. Lunardon;J. Luo;G. Luparello;C. Luzzi;R. Ma;K. Ma;D. M. Madagodahettige-Don;A. Maevskaya;M. Mager;D. P. Mahapatra;A. Maire;M. Malaev;I. Maldonado Cervantes;L. Malinina;D. Mal’Kevich;P. Malzacher;A. Mamonov;L. Manceau;L. Mangotra;V. Manko;F. Manso;V. Manzari;Y. Mao;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;Y. Martynov;A. Mas;S. Masciocchi;M. Masera;A. Masoni;L. Massacrier;A. Mastroserio;A. Matyja;C. Mayer;J. Mazer;M. A. Mazzoni;F. Meddi;A. Menchaca-Rocha;J. Mercado Pérez;M. Meres;Y. Miake;K. Mikhaylov;L. Milano;J. Milosevic;A. Mischke;A. N. Mishra;D. Miśkowiec;C. Mitu;S. Mizuno;J. Mlynarz;B. Mohanty;L. Molnar;L. Montaño Zetina;M. Monteno;E. Montes;T. Moon;M. Morando;D. A. Moreira De Godoy;S. Moretto;A. Morreale;A. Morsch;V. Muccifora;E. Mudnic;S. Muhuri;M. Mukherjee;H. Müller;M. G. Munhoz;S. Murray;L. Musa;J. Musinsky;B. K. Nandi;R. Nania;E. Nappi;C. Nattrass;T. K. Nayak;S. Nazarenko;A. Nedosekin;M. Nicassio;M. Niculescu;B. S. Nielsen;T. Niida;S. Nikolaev;V. Nikolic;S. Nikulin;V. Nikulin;B. S. Nilsen;M. S. Nilsson;F. Noferini;P. Nomokonov;G. Nooren;A. Nyanin;A. Nyatha;C. Nygaard;J. Nystrand;A. Ochirov;H. Oeschler;S. K. Oh;S. Oh;J. Oleniacz;A. C. Oliveira Da Silva;J. Onderwaater;C. Oppedisano;A. Ortiz Velasquez;A. Oskarsson;P. Ostrowski;J. Otwinowski;K. Oyama;K. Ozawa;Y. Pachmayer;M. Pachr;F. Padilla;P. Pagano;G. Paić;F. Painke;C. Pajares;S. K. Pal;A. Palaha;A. Palmeri;V. Papikyan;G. S. Pappalardo;W. J. Park;A. Passfeld;D. I. Patalakha;V. Paticchio;B. Paul;A. Pavlinov;T. Pawlak;T. Peitzmann;H. Pereira Da Costa;E. Pereira De Oliveira Filho;D. Peresunko;C. E. Pérez Lara;D. Perrino;W. Peryt;A. Pesci;Y. Pestov;V. Petráček;M. Petran;M. Petris;P. Petrov;M. Petrovici;C. Petta;S. Piano;M. Pikna;P. Pillot;O. Pinazza;L. Pinsky;N. Pitz;D. B. Piyarathna;M. Planinic;M. Płoskoń;J. Pluta;T. Pocheptsov;S. Pochybova;P. L. M. Podesta-Lerma;M. G. Poghosyan;K. Polák;B. Polichtchouk;N. Poljak;A. Pop;S. Porteboeuf-Houssais;V. Pospíšil;B. Potukuchi;S. K. Prasad;R. Preghenella;F. Prino;C. A. Pruneau;I. Pshenichnov;G. Puddu;V. Punin;M. Putiš;J. Putschke;H. Qvigstad;A. Rachevski;A. Rademakers;T. S. Räihä;J. Rak;A. Rakotozafindrabe;L. Ramello;S. Raniwala;R. Raniwala;S. S. Räsänen;B. T. Rascanu;D. Rathee;W. Rauch;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;L. Riccati;R. A. Ricci;T. Richert;M. Richter;P. Riedler;W. Riegler;F. Riggi;M. Rodríguez Cahuantzi;A. Rodriguez Manso;K. Røed;E. Rogochaya;D. Rohr;D. Röhrich;R. Romita;F. Ronchetti;P. Rosnet;S. Rossegger;A. Rossi;C. Roy;P. Roy;A. J. Rubio Montero;R. Rui;R. Russo;E. Ryabinkin;A. Rybicki;S. Sadovsky;K. Šafařík;R. Sahoo;P. K. Sahu;J. Saini;H. Sakaguchi;S. Sakai;D. Sakata;C. A. Salgado;J. Salzwedel;S. Sambyal;V. Samsonov;X. Sanchez Castro;L. Šándor;A. Sandoval;M. Sano;G. Santagati;R. Santoro;J. Sarkamo;D. Sarkar;E. Scapparone;F. Scarlassara;R. P. Scharenberg;C. Schiaua;R. Schicker;H. R. Schmidt;C. Schmidt;S. Schuchmann;J. Schukraft;T. Schuster;Y. Schutz;K. Schwarz;K. Schweda;G. Scioli;E. Scomparin;P. A. Scott;R. Scott;G. Segato;I. Selyuzhenkov;S. Senyukov;J. Seo;S. Serci;E. Serradilla;A. Sevcenco;A. Shabetai;G. Shabratova;R. Shahoyan;S. Sharma;N. Sharma;S. Rohni;K. Shigaki;K. Shtejer;Y. Sibiriak;E. Sicking;S. Siddhanta;T. Siemiarczuk;D. Silvermyr;C. Silvestre;G. Simatovic;G. Simonetti;R. Singaraju;R. Singh;S. Singha;V. Singhal;T. Sinha;B. C. Sinha;B. Sitar;M. Sitta;T. B. Skaali;K. Skjerdal;R. Smakal;N. Smirnov;R. J. M. Snellings;C. Søgaard;R. Soltz;J. Song;M. Song;C. Soos;F. Soramel;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;M. A. Subieta Vásquez;T. Sugitate;C. Suire;M. Suleymanov;R. Sultanov;M. Šumbera;T. Susa;T. J. M. Symons;A. Szanto de Toledo;I. Szarka;A. Szczepankiewicz;M. Szymański;J. Takahashi;M. A. Tangaro;J. D. Tapia Takaki;A. Tarantola Peloni;A. Tarazona Martinez;A. Tauro;G. Tejeda Muñoz;A. Telesca;A. Ter Minasyan;C. Terrevoli;J. Thäder;D. Thomas;R. Tieulent;A. R. Timmins;D. Tlusty;A. Toia;H. Torii;L. Toscano;V. Trubnikov;D. Truesdale;W. H. Trzaska;T. Tsuji;A. Tumkin;R. Turrisi;T. S. Tveter;J. Ulery;K. Ullaland;J. Ulrich;A. Uras;G. M. Urciuoli;G. L. Usai;M. Vajzer;M. Vala;L. Valencia Palomo;S. Vallero;P. Vande Vyvre;J. W. Hoorne;M. Leeuwen;L. Vannucci;A. Vargas;R. Varma;M. Vasileiou;A. Vasiliev;V. Vechernin;M. Veldhoen;M. Venaruzzo;E. Vercellin;S. Vergara;R. Vernet;M. Verweij;L. Vickovic;G. Viesti;J. Viinikainen;Z. Vilakazi;O. Villalobos Baillie;Y. Vinogradov;A. Vinogradov;L. Vinogradov;T. Virgili;Y. P. Viyogi;A. Vodopyanov;M. A. Völkl;K. Voloshin;S. Voloshin;G. Volpe;B. Haller;I. Vorobyev;D. Vranic;J. Vrláková;B. Vulpescu;A. Vyushin;B. Wagner;V. Wagner;R. Wan;Y. Wang;Y. Wang;M. Wang;K. Watanabe;M. Weber;J. P. Wessels;U. Westerhoff;J. Wiechula;J. Wikne;M. Wilde;G. Wilk;M. C. S. Williams;B. Windelband;M. Winn;C. G. Yaldo;Y. Yamaguchi;P. Yang;H. Yang;S. Yang;S. Yasnopolskiy;J. Yi;Z. Yin;I.-K. Yoo;J. Yoon;W. Yu;X. Yuan;I. Yushmanov;V. Zaccolo;C. Zach;C. Zampolli;S. Zaporozhets;A. Zarochentsev;P. Závada;N. Zaviyalov;H. Zbroszczyk;P. Zelnicek;I. S. Zgura;M. Zhalov;H. Zhang;Y. Zhang;X. Zhang;Y. Zhou;D. Zhou;F. Zhou;J. Zhu;H. Zhu;J. Zhu;X. Zhu;A. Zichichi;A. Zimmermann;G. Zinovjev;Y. Zoccarato;M. Zynovyev;M. Zyzak. - In: THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS. - ISSN 1434-6044. - STAMPA. - 73:7(2013), pp. 2496.1-2496.22. [10.1140/epjc/s10052-013-2496-5]
Mid-rapidity anti-baryon to baryon ratios in pp collisions at sqrt(s) = 0.9, 2.76 and 7 TeV measured by ALICE
AGOSTINELLI, ANDREA;ALICI, ANDREA;ARCELLI, SILVIA;BASILE, MAURIZIO;BELLINI, FRANCESCA;CIFARELLI, LUISA;FALCHIERI, DAVIDE;GUERZONI, BARBARA;SCIOLI, GILDA;
2013
Abstract
The ratios of yields of anti-baryons to baryons probes the mechanisms of baryon-number transport. Results for anti-p over p, anti-Lambda over Lambda, anti-Xi+ over Xi− and anti-Omega+ over Omega- in pp collisions at √s = 0.9, 2.76 and 7 TeV, measured with the ALICE detector at the LHC, are reported. Within the experimental uncertainties and ranges covered by our measurement, these ratios are independent of rapidity, transverse momentum and multiplicity for all measured energies. The results are compared to expectations from event generators, such as PYTHIA and HIJING/B, that are used to model the particle production in pp collisions. The energy dependence of anti-p/p, anti-Lambda/Lambda, antiXi+/Xi- and anti-Omega+/Omega- , reaching values compatible with unity for √s = 7 TeV, complement the earlier anti-p/p measurement of ALICE. These dependencies can be described by exchanges with the Regge-trajectory intercept of alpha_J ≈ 0.5, which are suppressed with increasing rapidity interval Delta_y. Any significant contribution of an exchange not suppressed at large Delat_y (reached at LHC energies) is disfavouredI documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
