Directed Flow of Charged Particles at Midrapidity Relative to the Spectator Plane in Pb-Pb Collisions at sqrt[s_{NN}]=2.76 TeV.

Summary, in English

The directed flow of charged particles at midrapidity is measured in Pb-Pb collisions at sqrt[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.

• Author: 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; 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 Aystö; 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; 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 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; 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 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; Peter 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; T R Czopowicz; A Dainese; R Dang; A Danu; D Das; I Das; S Das; K Das; A Dash; S Dash; S De; G O V 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 A Diaz Corchero; D Di Bari; T Dietel; C Di Giglio; S Di Liberto; A Di Mauro; P Di Nezza; R Divià; O Djuvsland; Alexandru Dobrin; T Dobrowolski; B Dönigus; O Dordic; A K Dubey; A Dubla; L Ducroux; P Dupieux; A K Dutta Majumdar; D Elia; B G Elwood; 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; A Gheata; M Gheata; B Ghidini; P Ghosh; P Gianotti; P Giubellino; E Gladysz-Dziadus; P Glässel; L Goerlich; R Gomez; E G Ferreiro; P González-Zamora; S Gorbunov; A Goswami; S Gotovac; L K Graczykowski; R Grajcarek; A Grelli; A Grigoras; C Grigoras; V Grigoriev; A Grigoryan; S Grigoryan; B Grinyov; N Grion; Philippe 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; O Haaland; C Hadjidakis; M Haiduc; H Hamagaki; G Hamar; B H Han; L D Hanratty; A Hansen; J W Harris; 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; C Ionita; M Ippolitov; M Irfan; V Ivanov; M Ivanov; A 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; M M Khan; P Khan; K H Khan; S A Khan; A Khanzadeev; Y Kharlov; B Kileng; J S Kim; B Kim; T Kim; D J Kim; S Kim; M Kim; D W Kim; J H Kim; M Kim; S Kirsch; I Kisel; S Kiselev; A Kisiel; G Kiss; 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; C Lagana Fernandes; I Lakomov; R Langoy; S L La Pointe; C Lara; A Lardeux; P La Rocca; R Lea; M Lechman; G R Lee; S C 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; Martin 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; M Marchisone; J Mareš; G V Margagliotti; A Margotti; A Marín; C Markert; M Marquard; I Martashvili; N A Martin; J Martin Blanco; 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; R Mazumder; 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; 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; M Nasar; C Nattrass; T K Nayak; S Nazarenko; A Nedosekin; M Nicassio; M Niculescu; B S Nielsen; S Nikolaev; V Nikolic; V Nikulin; S 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; L Olah; J Oleniacz; A C Oliveira Da Silva; J Onderwaater; C Oppedisano; Antonio Ortiz Velasquez; Anders 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; J Putschke; H Qvigstad; A Rachevski; A Rademakers; 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; Tuva Richert; M Richter; P Riedler; W Riegler; F Riggi; A Rivetti; M Rodríguez Cahuantzi; A Rodriguez Manso; K Røed; E Rogochaya; D Rohr; D Röhrich; R Romita; F Ronchetti; P Rosnet; S Rossegger; A Rossi; P Roy; C Roy; A J Rubio Montero; R Rui; R Russo; E Ryabinkin; A Rybicki; S Sadovsky; K Safařík; 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 Sándor; A Sandoval; M Sano; G Santagati; R Santoro; D Sarkar; E Scapparone; F Scarlassara; R P Scharenberg; C Schiaua; R Schicker; C Schmidt; H R Schmidt; S Schuchmann; J Schukraft; M Schulc; 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; N Sharma; S Sharma; S Rohni; K Shigaki; K Shtejer; Y Sibiriak; 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; Carsten Sogaard; R Soltz; J Song; M Song; C Soos; F Soramel; M Spacek; I Sputowska; M Spyropoulou-Stassinaki; B K Srivastava; J Stachel; I Stan; G Stefanek; M Steinpreis; Evert 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 Sumbera; 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 Van Hoorne; M van 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 von Haller; I Vorobyev; D Vranic; J Vrláková; B Vulpescu; A Vyushin; B Wagner; V Wagner; J Wagner; Y Wang; M Wang; Y Wang; D Watanabe; K Watanabe; M Weber; J P Wessels; U Westerhoff; J Wiechula; D Wielanek; J Wikne; M Wilde; G Wilk; J Wilkinson; M C S Williams; M Winn; B Windelband; C Xiang; C G Yaldo; Y Yamaguchi; H Yang; S Yang; P Yang; S Yano; S Yasnopolskiy; J Yi; Z Yin; I-K Yoo; J Yoon; 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; Y Zhang; X Zhang; F Zhang; H Zhang; Y Zhou; F Zhou; D Zhou; H Zhu; X Zhu; J Zhu; J Zhu; A Zichichi; A Zimmermann; G Zinovjev; Y Zoccarato; M Zynovyev; M Zyzak
• Department/s: Particle and nuclear physics
• Publishing year: 2013
• Language: English
• Publication/Series: Physical Review Letters
• Volume: 111
• Issue: 23
• Full text: - 515 kB; Download statistics
• Links: http://dx.doi.org/10.1103/PhysRevLett.111.232302
• Document type: Journal article
• Publisher: American Physical Society
• Topic: Subatomic Physics
• Status: Published
• ISBN/ISSN/Other: ISSN: 1079-7114