Charmonium and e + e − pair photoproduction at mid-rapidity in ultra-peripheral Pb–Pb collisions at $\sqrt{s_{\mathrm{NN}}} = 2.76\ \mbox{TeV}$
Articolo
Data di Pubblicazione:
2013
Abstract:
The ALICE Collaboration at the LHC has mea- sured the J/ψ and ψ′ photoproduction at mid-rapidity in ultra-peripheral Pb–Pb collisions at √sNN = 2.76 TeV.
The charmonium is identified via its leptonic decay for
events where the hadronic activity is required to be mini-
mal. The analysis is based on an event sample correspond-
ing to an integrated luminosity of about 23 μb−1. The
cross section for coherent and incoherent J/ψ production
in the rapidity interval −0.9 < y < 0.9, are dσcoh/dy = J/ψ
2.38+0.34(sta+sys) mb and dσinc /dy = 0.98+0.19(sta + −0.24 J/ψ −0.17
sys) mb, respectively. The results are compared to theoret- ical models for J/ψ production and the coherent cross sec- tion is found to be in good agreement with those models in- corporating moderate nuclear gluon shadowing at Bjorken- x around 10−3, such as EPS09 parametrization. In addition the cross section for the process γ γ → e+e− has been mea- sured and found to be in agreement with models implement- ing QED at leading order.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
charmonium; PAIR PRODUCTION; mid-rapidity Pb-Pb collisions
Elenco autori:
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;D. Alexandre;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;L. Bianchi;N. 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;W. Carena;F. 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;I. Das;S. Das;D. 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;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;M. Gheata;A. Gheata;B. Ghidini;P. Ghosh;P. Gianotti;P. Giubellino;E. Gl
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