The first measurement of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at a centre-of-mass energy per nucleon pair sqrt(sNN) = 2.76 TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section the pseudo-rapidity density of primary charged particles at mid-rapidity is 1584 +- 4 (stat) +- 76 (sys.), which corresponds to 8.3 +- 0.4 (sys.) 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 sqrt(sNN) = 0.2 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.

Charged-Particle Multiplicity Density at Midrapidity in Central Pb-Pb Collisions at sqrt[s_{NN}]=2.76  TeV

BEOLE', Stefania;BIANCHI, LIVIO;BIOLCATI, EMANUELE;CORRALES MORALES, YASSER;FERRETTI, Alessandro;GAGLIARDI, Martino;GALLIO, Mauro;INNOCENTI, GIAN MICHELE;LUPARELLO, GRAZIA;MASERA, Massimo;MILANO, LEONARDO;ORTONA, GIACOMO;POGHOSYAN, MARTIN;SICILIANO, MELINDA;VERCELLIN, Ermanno;
2010-01-01

Abstract

The first measurement of the charged-particle multiplicity density at mid-rapidity in Pb-Pb collisions at a centre-of-mass energy per nucleon pair sqrt(sNN) = 2.76 TeV is presented. For an event sample corresponding to the most central 5% of the hadronic cross section the pseudo-rapidity density of primary charged particles at mid-rapidity is 1584 +- 4 (stat) +- 76 (sys.), which corresponds to 8.3 +- 0.4 (sys.) 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 sqrt(sNN) = 0.2 TeV. This measurement provides the first experimental constraint for models of nucleus-nucleus collisions at LHC energies.
2010
105
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K. Aamodt;B. Abelev;A. Abrahantes Quintana;D. Adamová;A. Adare;M. Aggarwal;G. Aglieri Rinella;A. Agocs;S. Aguilar Salazar;Z. Ahammed;A. Ahmad Masoodi;N. Ahmad;S. 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. Andronic;V. Anguelov;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;A. Asryan;A. Augustinus;R. Averbeck;T. Awes;J. Äystö;M. Azmi;M. Bach;A. Badalà;Y. 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. Barnaföldi;L. Barnby;V. Barret;J. Bartke;M. Basile;N. Bastid;B. Bathen;G. Batigne;B. Batyunya;C. Baumann;I. Bearden;H. Beck;I. Belikov;F. Bellini;R. Bellwied;E. Belmont-Moreno;S. Beole;I. Berceanu;A. Bercuci;E. Berdermann;Y. Berdnikov;C. Bergmann;L. Betev;A. Bhasin;A. Bhati;L. Bianchi;N. Bianchi;C. Bianchin;J. Bielčík;J. Bielčíková;A. Bilandzic;E. Biolcati;A. Blanc;F. Blanco;F. Blanco;D. Blau;C. Blume;M. Boccioli;N. Bock;A. Bogdanov;H. Bøggild;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. 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 Díaz;M. Caselle;J. Castillo Castellanos;V. Catanescu;C. Cavicchioli;J. Cepila;P. Cerello;B. Chang;S. Chapeland;J. Charvet;S. Chattopadhyay;S. Chattopadhyay;M. Cherney;C. Cheshkov;B. Cheynis;E. Chiavassa;V. Chibante Barroso;D. Chinellato;P. Chochula;M. Chojnacki;P. Christakoglou;C. Christensen;P. Christiansen;T. Chujo;C. Cicalo;L. Cifarelli;F. Cindolo;J. Cleymans;F. Coccetti;J.-P. Coffin;S. Coli;G. Conesa Balbastre;Z. 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