1. Charged-particle multiplicity density at midrapidity in central Pb-Pb collisions at sqrt[S(NN)] = 2.76 TeV.
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Aamodt K, Abelev B, Quintana AA, Adamová D, Adare AM, Aggarwal MM, Rinella GA, Agocs AG, Salazar SA, Ahammed Z, Masoodi AA, Ahmad N, Ahn SU, Akindinov A, Aleksandrov D, Alessandro B, Molina RA, Alici A, Alkin A, Aviña EA, Alt T, Altini V, Altinpinar S, Altsybeev I, Andrei C, Andronic A, Anguelov V, 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, Asryan A, Augustinus A, Averbeck R, Awes TC, Aystö J, Azmi MD, Bach M, Badalà A, Baek YW, Bagnasco S, Bailhache R, Bala R, Ferroli RB, Baldisseri A, Baldit A, Pedrosa FB, Bán J, Barbera R, Barile F, Barnaföldi GG, Barnby LS, Barret V, Bartke J, Basile M, Bastid N, Bathen B, Batigne G, Batyunya B, Baumann C, Bearden IG, Beck H, Belikov I, Bellini F, Bellwied R, Belmont-Moreno E, Beole S, Berceanu I, Bercuci A, Berdermann E, Berdnikov Y, Bergmann C, Betev L, Bhasin A, Bhati AK, Bianchi L, Bianchi N, Bianchin C, Bielčík J, Bielčíková J, Bilandzic A, Biolcati E, Blanc A, Blanco F, Blanco F, Blau D, Blume C, Boccioli M, Bock N, Bogdanov A, Bøggild H, Bogolyubsky M, Boldizsár L, Bombara M, Bombonati C, Book J, Borel H, Borissov A, Bortolin C, Bose S, Bossú F, Botje M, Böttger S, Boyer B, Braun-Munzinger P, Bravina L, Bregant M, Breitner T, Broz M, Brun R, Bruna E, Bruno GE, Budnikov D, Buesching H, Bugaiev K, Busch O, Buthelezi Z, Caffarri D, Cai X, Caines H, Villar EC, Camerini P, Roman VC, Romeo GC, Carena F, Carena W, Carminati F, Díaz AC, Caselle M, Castellanos JC, Catanescu V, Cavicchioli C, Cepila J, Cerello P, Chang B, Chapeland S, Charvet JL, Chattopadhyay S, Chattopadhyay S, Cherney M, Cheshkov C, Cheynis B, Chiavassa E, Barroso VC, Chinellato DD, Chochula P, Chojnacki M, Christakoglou P, Christensen CH, Christiansen P, Chujo T, Cicalo C, Cifarelli L, Cindolo F, Cleymans J, Coccetti F, Coffin JP, Coli S, Balbastre GC, Del Valle ZC, Constantin P, Contin G, Contreras JG, Cormier TM, Morales YC, Maldonado IC, Cortese P, Cosentino MR, Costa F, Cotallo ME, Crescio E, Crochet P, Cuautle E, Cunqueiro L, Erasmo GD, Dainese A, Dalsgaard HH, Danu A, Das D, Das I, Das K, Dash A, Dash S, De S, Moregula Ade A, de Barros GO, De Caro A, de Cataldo G, de Cuveland J, De Falco A, De Gruttola D, De Marco N, De Pasquale S, De Remigis R, de Rooij R, Debski PR, Sanchez Edel C, Delagrange H, Mercado YD, Dellacasa G, Deloff A, Demanov V, Dénes E, Deppman A, Di Bari D, Di Giglio C, Di Liberto S, Di Mauro A, Di Nezza P, Dietel T, Divià R, Djuvsland Ø, Dobrin A, Dobrowolski T, Domínguez I, Dönigus B, Dordic O, Driga O, Dubey AK, Dubuisson J, Ducroux L, Dupieux P, Majumdar AK, Majumdar MR, Elia D, Emschermann D, Engel H, Erdal HA, Espagnon B, Estienne M, Esumi S, Evans D, Evrard S, Eyyubova G, Fabjan CW, Fabris D, Faivre J, Falchieri D, Fantoni A, Fasel M, Fearick R, Fedunov A, Fehlker D, Fekete V, Felea D, Feofilov G, Téllez AF, Ferretti A, Ferretti R, Figiel J, Figueredo MA, Filchagin S, Fini R, Finogeev D, Fionda FM, Fiore EM, Floris M, Foertsch S, Foka P, Fokin S, Fragiacomo E, Fragkiadakis M, Frankenfeld U, Fuchs U, Furano F, Furget C, Girard MF, Gaardhøje JJ, Gadrat S, Gagliardi M, Gago A, Gallio M, Gangadharan DR, Ganoti P, Ganti MS, Garabatos C, Garcia-Solis E, Garishvili I, Gemme R, Gerhard J, Germain M, Geuna C, Gheata A, Gheata M, Ghidini B, Ghosh P, Gianotti P, Girard MR, Giraudo G, Giubellino P, Gladysz-Dziadus E, Glässel P, Gomez R, Ferreiro EG, Santos HG, González-Trueba LH, González-Zamora P, Gorbunov S, Gotovac S, Grabski V, 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, Gutierrez CG, Guerzoni B, Gulbrandsen K, Gunji T, Gupta A, Gupta R, Gutbrod H, Haaland Ø, Hadjidakis C, Haiduc M, Hamagaki H, Hamar G, Harris JW, Hartig M, Hasch D, Hasegan D, Hatzifotiadou D, Hayrapetyan A, Heide M, Heinz M, Helstrup H, Herghelegiu A, Hernández C, Corral GH, Herrmann N, Hetland KF, Hicks B, Hille PT, Hippolyte B, Horaguchi T, Hori Y, Hristov P, Hřivnáčová I, Huang M, Huber S, Humanic TJ, Hwang DS, Ichou R, Ilkaev R, Ilkiv I, Inaba M, Incani E, Innocenti GM, Innocenti PG, Ippolitov M, Irfan M, Ivan C, Ivanov A, Ivanov M, Ivanov V, Jachołkowski A, Jacobs PM, Jancurová L, Jangal S, Janik R, Jena S, Jirden L, Jones GT, Jones PG, Jovanović P, Jung H, Jung W, Jusko A, Kalcher S, Kaliňák P, Kalisky M, Kalliokoski T, Kalweit A, Kamermans R, Kanaki K, Kang E, Kang JH, Kaplin V, Karavichev O, Karavicheva T, Karpechev E, Kazantsev A, Kebschull U, Keidel R, Khan MM, Khan SA, Khanzadeev A, Kharlov Y, Kileng B, Kim DJ, Kim DS, Kim DW, Kim HN, Kim JH, Kim JS, Kim M, Kim M, Kim S, Kim SH, Kirsch S, Kisel I, Kiselev S, Kisiel A, Klay JL, Klein J, Klein-Bösing C, Kliemant M, Klovning A, Kluge A, Knichel ML, Koch K, Köhler MK, Kolevatov R, Kolojvari A, Kondratiev V, Kondratyeva N, Konevskih A, Kornaś E, Don CK, Kour R, Kowalski M, Kox S, Meethaleveedu GK, Kozlov K, Kral J, Králik I, Kramer F, Kraus I, Krawutschke T, Kretz M, Krivda M, Krizek F, Krumbhorn D, Krus M, Kryshen E, Krzewicki M, Kucheriaev Y, Kuhn C, Kuijer PG, Kurashvili P, Kurepin A, Kurepin AB, Kuryakin A, Kushpil S, Kushpil V, Kweon MJ, Kwon Y, La Rocca P, de Guevara PL, Lafage V, Lara C, Lardeux A, Larsen DT, Lazzeroni C, Le Bornec Y, Lea R, Lee KS, Lee SC, Lefèvre F, Lehnert J, Leistam L, Lenhardt M, Lenti V, Monzón IL, Vargas HL, Lévai P, Li X, Lien J, Lietava R, Lindal S, Lindenstruth V, Lippmann C, Lisa MA, Liu L, Loenne PI, Loggins VR, Loginov V, Lohn S, Loizides C, Loo KK, Lopez X, Noriega ML, Torres EL, Løvhøiden G, Lu XG, Luettig P, Lunardon M, Luparello G, Luquin L, Luzzi C, Ma K, Ma R, Madagodahettige-Don DM, Maevskaya A, Mager M, Mahapatra DP, Maire A, Mal'Kevich D, Malaev M, Cervantes IM, Malinina L, Malzacher P, Mamonov A, Manceau L, Mangotra L, Manko V, Manso F, Manzari V, Mao Y, Mareš J, Margagliotti GV, Margotti A, Marín A, Markert C, Martashvili I, Martinengo P, 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- Abstract
The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair √ S NN = 2.76 TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section, the pseudorapidity density of primary charged particles at midrapidity is 1584 ± 4(stat) ± 76(syst), which corresponds to 8.3 ± 0.4(syst) per participating nucleon pair. This represents an increase of about a factor 1.9 relative to pp collisions at similar collision energies, and about a factor 2.2 to central Au-Au collisions at √ S NN = 2.76 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.
- Published
- 2010
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