Charged-Particle Multiplicity Density At Midrapidity In Central Pb-Pb Collisions At Root S(Nn)=2.76 Tev
ALICE collaboration,K. Aamodt,B. Abelev,A. Abrahantes Quintana,D. Adamová,A. M. Adare,M. M. Aggarwal,G. Aglieri Rinella,A. G. Agocs,S. Aguilar Salazar, Z. Ahammed,A. Ahmad Masoodi,N. Ahmad,S. U. Ahn,A. Akindinov,D. Aleksandrov, B. Alessandro,R. Alfaro Molina,A. Alici,A. Alkin,E. Almaráz Aviña,T. Alt,V. Altini,S. Altinpinar,I. Altsybeev,C. Andrei, A. Augustinus,V. Anguelov,C. Anson, T. Antivcić,F. Antinori, P. Antonioli, L. Aphecetche,H. Appelshäuser,N. Arbor, S. Arcelli,A. Arend,N. Armesto,R. Arnaldi, T. Aronsson,I. C. Arsene,A. Asryan, A. Augustinus, R. Averbeck, T. C. Awes,J. Äystö,M. D. Azmi,M. Bach,A. Badalà,Y. W. Baek,S. Bagnasco,R. Bailhache,R. Bala,R. Baldini Ferroli, A. Baldisseri,A. Baldit,F. Baltasar Dos Santos Pedrosa,J. Bán,R. Barbera,F. Barile,G. G. Barnaföldi,L. S. Barnby,V. Barret,J. Bartke,M. Basile,N. Bastid,B. Bathen,G. Batigne,B. Batyunya,C. Baumann,I. G. Bearden,H. Beck,I. Belikov,F. Bellini,R. Bellwied,E. Belmont-Moreno,S. Beole,I. Berceanu,A. Bogdanov,E. Berdermann,Y. Berdnikov,C. Bergmann, L. Betev,A. Bhasin, A. K. Bhati,L. Bianchi,N. Bianchi,C. Bianchin, J. Bielvcík, J. Bielvciková,A. Bilandzic,E. Biolcati,A. Blanc,F. Blanco,D. Blau,C. Blume,M. Boccioli,N. Bock,A. Bogdanov,H. Boggild,M. Bogolyubsky,L. Boldizsár,M. Bombara,C. Bombonati,J. Book,H. Borel,A. Borissov,C. Bortolin,S. Bose,F. Bossú, M. Botje,S. Böttger,B. Boyer, P. Braun-Munzinger,L. Bravina,M. Bregant,T. Breitner,M. Broz,R. Brun,E. Bruna,G. E. Bruno,D. Budnikov,H. Buesching, K. Bugaiev, O. Busch,Z. Buthelezi,D. Caffarri,X. Cai,H. Caines,E. Calvo Villar,P. Camerini,V. Canoa Roman,G. Cara Romeo,F. Carena,W. Carena,F. Carminati,A. Casanova Diaz,M. Caselle,J. Castillo Castellanos,V. Catanescu,C. Cavicchioli, J. Cepila,P. Cerello,B. Chang,S. Chapeland,J. L. Charvet,S. Chattopadhyay, M. Cherney,C. Cheshkov,B. Cheynis, E. Chiavassa,V. Chibante Barroso,D. D. Chinellato, P. Chochula,M. Chojnacki,P. Christakoglou,C. H. Christensen,P. Christiansen,T. Chujo,C. Cicalo, L. 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PHYSICAL REVIEW LETTERS（2010）
引用 371|浏览204
摘要
The first measurement of the charged-particle multiplicity density at midrapidity in Pb-Pb collisions at a center-of-mass energy per nucleon pair root 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 root s(NN) = 0.2 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.
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关键词
charged particles,cross section,centre of mass
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