1. Directed flow of charged particles at midrapidity relative to the spectator plane in Pb-Pb collisions at √(s(NN))=2.76 TeV.
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Abelev B, Adam J, Adamová D, Adare AM, Aggarwal MM, Aglieri Rinella G, Agnello M, Agocs AG, Agostinelli A, Ahammed Z, Ahmad N, Ahmad Masoodi A, Ahmed I, Ahn SA, Ahn SU, Aimo I, Ajaz M, Akindinov A, Aleksandrov D, Alessandro B, Alexandre D, Alici A, Alkin A, Alme J, Alt T, Altini V, Altinpinar S, Altsybeev I, Andrei C, Andronic A, Anguelov V, Anielski J, Anson C, Antičić T, Antinori F, Antonioli P, Aphecetche L, Appelshäuser H, Arbor N, Arcelli S, Arend A, Armesto N, Arnaldi R, Aronsson T, Arsene IC, Arslandok M, Asryan A, Augustinus A, Averbeck R, Awes TC, Äystö J, Azmi MD, Bach M, Badalà A, Baek YW, Bailhache R, Bala R, Baldisseri A, Baltasar Dos Santos Pedrosa F, Bán J, Baral RC, Barbera R, Barile F, Barnaföldi GG, Barnby LS, Barret V, Bartke J, Basile M, Bastid N, Basu S, Bathen B, Batigne G, Batyunya B, Batzing PC, Baumann C, Bearden IG, Beck H, Behera NK, Belikov I, Bellini F, Bellwied R, Belmont-Moreno E, Bencedi G, Beole S, Berceanu I, Bercuci A, Berdnikov Y, Berenyi D, Bergognon AA, Bertens RA, Berzano D, Betev L, Bhasin A, Bhati AK, Bhom J, Bianchi L, Bianchi N, Bianchin C, Bielčík J, Bielčíková J, Bilandzic A, Bjelogrlic S, Blanco F, Blanco F, Blau D, Blume C, Boccioli M, Bock F, Böttger S, Bogdanov A, Bøggild H, Bogolyubsky M, Boldizsár L, Bombara M, Book J, Borel H, Borissov A, Bossú F, Botje M, Botta E, Braidot E, Braun-Munzinger P, Bregant M, Breitner T, Broker TA, Browning TA, Broz M, Brun R, Bruna E, Bruno GE, Budnikov D, Buesching H, Bufalino S, Buncic P, Busch O, Buthelezi Z, Caffarri D, Cai X, Caines H, Caliva A, Calvo Villar E, Camerini P, Canoa Roman V, Cara Romeo G, Carena F, Carena W, Carlin Filho N, Carminati F, Casanova Díaz A, Castillo Castellanos J, Castillo Hernandez JF, Casula EA, Catanescu V, Cavicchioli C, Ceballos Sanchez C, Cepila J, Cerello P, Chang B, Chapeland S, Charvet JL, Chattopadhyay S, Chattopadhyay S, Cherney M, Cheshkov C, Cheynis B, Chibante Barroso V, Chinellato DD, Chochula P, Chojnacki M, Choudhury S, Christakoglou P, Christensen CH, Christiansen P, Chujo T, Chung SU, Cicalo C, Cifarelli L, Cindolo F, Cleymans J, Colamaria F, Colella D, Collu A, Conesa Balbastre G, Conesa del Valle Z, Connors ME, Contin G, Contreras JG, Cormier TM, Corrales Morales Y, Cortese P, Cortés Maldonado I, Cosentino MR, Costa F, Cotallo ME, Crescio E, Crochet P, Cruz Alaniz E, Cruz Albino R, Cuautle E, Cunqueiro L, Czopowicz TR, Dainese A, Dang R, Danu A, Das D, Das I, Das S, Das K, Dash A, Dash S, De S, de Barros GO, De Caro A, de Cataldo G, de Cuveland J, De Falco A, De Gruttola D, Delagrange H, Deloff A, De Marco N, Dénes E, De Pasquale S, Deppman A, D'Erasmo G, de Rooij R, Diaz Corchero MA, Di Bari D, Dietel T, Di Giglio C, Di Liberto S, Di Mauro A, Di Nezza P, Divià R, Djuvsland Ø, Dobrin A, Dobrowolski T, Dönigus B, Dordic O, Dubey AK, Dubla A, Ducroux L, Dupieux P, Dutta Majumdar AK, Elia D, Elwood BG, Emschermann D, Engel H, Erazmus B, Erdal HA, Eschweiler D, Espagnon B, Estienne M, Esumi S, Evans D, Evdokimov S, Eyyubova G, Fabris D, Faivre J, Falchieri D, Fantoni A, Fasel M, Fehlker D, Feldkamp L, Felea D, Feliciello A, Fenton-Olsen B, Feofilov G, Fernández Téllez A, Ferretti A, Festanti A, Figiel J, Figueredo MA, Filchagin S, Finogeev D, Fionda FM, Fiore EM, Floratos E, Floris M, Foertsch S, Foka P, Fokin S, Fragiacomo E, Francescon A, Frankenfeld U, Fuchs U, Furget C, Fusco Girard M, Gaardhøje JJ, Gagliardi M, Gago A, Gallio M, Gangadharan DR, Ganoti P, Garabatos C, Garcia-Solis E, Gargiulo C, Garishvili I, Gerhard J, Germain M, Gheata A, Gheata M, Ghidini B, Ghosh P, Gianotti P, Giubellino P, Gladysz-Dziadus E, Glässel P, Goerlich L, Gomez R, Ferreiro EG, González-Zamora P, Gorbunov S, Goswami A, Gotovac S, Graczykowski LK, Grajcarek R, Grelli A, Grigoras A, Grigoras C, Grigoriev V, Grigoryan A, Grigoryan S, Grinyov B, Grion N, Gros P, Grosse-Oetringhaus JF, Grossiord JY, Grosso R, Guber F, Guernane R, Guerzoni B, Guilbaud M, Gulbrandsen K, Gulkanyan H, Gunji T, Gupta A, 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- Abstract
The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at √(s(NN))=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 p(T) between 1.2 and 1.7 GeV/c. Combined with the observation of a vanishing rapidity-even p(T) 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.
- Published
- 2013
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