Directed Flow of Charged Particles at Midrapidity Relative to the Spectator Plane in Pb-Pb Collisions at sqrt(sNN) = 2.76 TeV
Articolo
Data di Pubblicazione:
2013
Abstract:
The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at 2:76 TeV relative to the collision symmetry plane defined by the spectator nucleons. A negative slope of the rapidity-odd directed flow component with approximately 3 times smaller magnitude than found at the highest RHIC energy is observed. This suggests a smaller longitudinal tilt of the initial system and disfavors the strong fireball rotation predicted for the LHC energies. The rapidity-even directed flow component is measured for the first time with spectators and found to be independent of pseudorapidity with a sign change at transverse momenta pT between 1.2 and 1:7 GeV=c. Combined with the observation of a vanishing rapidity-even pT shift along the spectator deflection this is strong evidence for dipolelike initial density fluctuations in the overlap zone of the nuclei. Similar trends in the rapidity-even directed flow and the estimate from two-particle correlations at midrapidity, which is larger by about a factor of 40, indicate a weak correlation between fluctuating participant and spectator symmetry planes. These observations open new possibilities for investigation of the initial conditions in heavy-ion collisions with spectator nucleons.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
direct flow
Elenco autori:
B. Abelev;J. Adam;D. Adamová;A. Adare;M. Aggarwal;G. Aglieri Rinella;M. Agnello;A. Agocs;A. Agostinelli;Z. Ahammed;N. Ahmad;A. Ahmad Masoodi;I. Ahmed;S. Ahn;S. Ahn;I. Aimo;M. Ajaz;A. Akindinov;D. Aleksandrov;B. Alessandro;D. Alexandre;A. Alici;A. Alkin;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. Arsene;M. Arslandok;A. Asryan;A. Augustinus;R. Averbeck;T. Awes;J. Äystö;M. Azmi;M. Bach;A. Badalà;Y. Baek;R. Bailhache;R. Bala;A. Baldisseri;F. Baltasar Dos Santos Pedrosa;J. Bán;R. Baral;R. Barbera;F. Barile;G. Barnaföldi;L. Barnby;V. Barret;J. Bartke;M. Basile;N. Bastid;S. Basu;B. Bathen;G. Batigne;B. Batyunya;P. Batzing;C. Baumann;I. Bearden;H. Beck;N. Behera;I. Belikov;F. Bellini;R. Bellwied;E. Belmont-Moreno;G. Bencedi;S. Beole;I. Berceanu;A. Bercuci;Y. Berdnikov;D. Berenyi;A. Bergognon;R. Bertens;D. Berzano;L. Betev;A. Bhasin;A. 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;F. Bock;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. Broker;T. Browning;M. Broz;R. Brun;E. Bruna;G. Bruno;D. Budnikov;H. Buesching;S. Bufalino;P. Buncic;O. Busch;Z. Buthelezi;D. Caffarri;X. Cai;H. Caines;A. Caliva;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. Castillo Hernandez;E. Casula;V. Catanescu;C. Cavicchioli;C. Ceballos Sanchez;J. Cepila;P. Cerello;B. Chang;S. Chapeland;J. Charvet;S. Chattopadhyay;S. Chattopadhyay;M. Cherney;C. Cheshkov;B. Cheynis;V. Chibante Barroso;D. Chinellato;P. Chochula;M. Chojnacki;S. Choudhury;P. Christakoglou;C. Christensen;P. Christiansen;T. Chujo;S. Chung;C. Cicalo;L. Cifarelli;F. Cindolo;J. Cleymans;F. Colamaria;D. Colella;A. Collu;G. Conesa Balbastre;Z. Conesa del Valle;M. Connors;G. Contin;J. Contreras;T. Cormier;Y. Corrales Morales;P. Cortese;I. Cortés Maldonado;M. Cosentino;F. Costa;M. Cotallo;E. Crescio;P. Crochet;E. Cruz Alaniz;R. Cruz Albino;E. Cuautle;L. Cunqueiro;T. Czopowicz;A. Dainese;R. Dang;A. Danu;D. Das;I. Das;S. Das;K. Das;A. Dash;S. Dash;S. De;G. de Barros;A. De Caro;G. de Cataldo;J. de Cuveland;A. De Falco;D. De Gruttola;H. Delagrange;A. Deloff;N. De Marco;E. Dénes;S. De Pasquale;A. Deppman;G. D’Erasmo;R. de Rooij;M. Diaz Corchero;D. Di Bari;T. Dietel;C. Di Giglio;S. Di Liberto;A. Di Mauro;P. Di Nezza;R. Divià;Ø. Djuvsland;A. Dobrin;T. Dobrowolski;B. Dönigus;O. Dordic;A. Dubey;A. Dubla;L. Ducroux;P. Dupieux;A. Dutta Majumdar;D. Elia;B. Elwood;D. Emschermann;H. Engel;B. Erazmus;H. 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. Figueredo;S. Filchagin;D. Finogeev;F. Fionda;E. 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. Gaardhøje;M. Gagliardi;A. Gago;M. Gallio;D. Gangadharan;P. Ganoti;C. Garabatos;E. Garcia-Solis;C. Gargiulo;I. Garishvili;J. Gerhard;M. Germain;A. Gheata;M. Gheata;B. Ghidini;P. Ghosh;P. Gianotti;P. Giubellino;E. Gladysz-Dziadus;P. Glässel;L. Goerlich;R. Gomez;E. Ferreiro;P. González-Zamora;S. Gor
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