Transverse-momentum and pseudorapidity distributions of charged hadrons in pp collisions at $\sqrt{s} = 0.9 $ and 2.36 TeV

V Khachatryan,D Gigi,L Sala,G Barbagli,S Korjenevski,J Rander,J B Singh,M Hoch,H B Rhee,S Kwan,V Tancini,G R Snow,V Smirnov,M Kazana,E Friis,T Bose,M Djordjevic,A Pozdnyakov,M Marionneau,J Muelmenstaedt,G Organtini,S Gascon,M Pesaresi,J.-L Agram,P Arce,D M Newbold,M Pernicka,L Lusito,G Walzel,F Moortgat,G Dellacasa,M Mannelli,K Sudhakar,A Campbell,A Solano,J Eugster,Y Pakhotin,N Neumeister,B A Barnett,S Bolognesi,S My,J Strauss,M Tytgat,T Christiansen,D Piccolo,S Sharma,V Gaultney,J Conway,D H Miller,A Tricomi,J Varela,Z Wan,C Battilana,C Rogan,J Cuevas,I Katkov,E Vlasov,J Jones,S Maruyama,S Cittolin,I Fisk,R Stringer,Y Zheng,W Haj Ahmad,W H Smith,J P Cumalat,O Kaya,G Gomez Ceballos,P Gupta,A Scheurer,W D Zeuner,B Ille,D Kovalskyi,A Bornheim,A Cimmino,C N Nguyen,D Treille,C Farrell,J Butt,R Wolf,L Antonelli,E Cortina Gil,G Hu,D Acosta,P Capiluppi,R Stone,F Ambroglini,V Zhukova,M Klute,L Levchuk,I Belotelov,B Diamond,N Amapane,T Peiffer,E A Chen,S Braibant-Giacomelli,F A Dias,S Ventura,D Puigh,L Borrello,K W Bell,S Carrillo Moreno,S Tosi,A Perrotta,J Keller,S Hänsel,M Demarteau,A Montanari,J Speck,D Hits,I R Tomalin,P Negri,J St John,P Sauerland,J Gutleber,N Leonardo,A Panagiotou,A.-C Le Bihan,J C Sanabria,E A Albayrak,A Soha,J Berryhill,C Eskew,C Hartl,L A T Bauerdick,E Brownson,C Charlot,G Masetti,M Stein,J Yelton,A Kamenev,D Daeuwel,A Aranyi,P Avery,R Hirosky,A Ledovskoy,C Florez,D Lopes Pegna,L N Vergili,P Baillon,D Dutta,F L Navarria,P Baringer,V Oguri,A Sznajder,L Lloret Iglesias,D Giordano,S Vanini,V Genchev,T Dahms,D Barge,J Steggemann,J G Shiu,M E Dinardo,Y Roh,T Tabarelli De Fatis,S Hagopian,B De La Cruz,M Narain,S Naumann-Emme,K F Johnson,J Maes,T Adams,S Nahn,W Bertl,Z Gecse,S Troitsky,A Skuja,G Hall,P Kalavase,S Honc,D Colling,E Berry,M Albrow,S W Lin,M Della Negra,P Lecomte,E Tuominen,S Gennai,M Balazs,G Safronov,V Kozhuharov,A Lucaroni,S Somalwar,A York,Y Hsiung,J Gilmore,M Mooney,M Vergili,D Del Re,P Torre,T Boccali,G Grégoire,C Dragoiu,Q Ingram,A Dierlamm,C Delaere,R Covarelli,W Bender,K Lelas,A Tsirou,I Vorobiev,M De Mattia,G S F Stephans,P Suggisetti,I Lazzizzera,A Kubik,I Vila,A Stahl,D Creanza,R Volpe,I Evangelou,J.-C Fontaine,M Zeyrek,J Tuominiemi,R Vidal,M Simon,S M Silva Do Amaral,L Dudko,D Renker,J Asaadi,N Krasnikov,S W Li,D H Kim,C Newman-Holmes,G Petrucciani,S Semenov,J Olson,S Sekmen,J Babb,P Shukla,V Karjavin,C Mironov,J Frangenheim,H Park,F Glege,S Rahatlou,F Yumiceva,M Jindal,A Singovsky,K Hatakeyama,A Besson,H Gamsizkan,L Perchalla,E Luiggi Lopez,S Dugad,R D’Alessandro,A Holzner,C Loizides,A Volodko,T Hebbeker,F Blekman,J S Werner,P Cole,J Haas,J Seixas,M Sasseville,K Ranjan,A Petrilli,I C Park,F Santanastasio,U Behrens,K Burkett,G Bagliesi,Z Demir,Y Musienko,V Kaftanov,C H Shepherd-Themistocleous,M Cepeda,S Das,S Paoletti,P Miné,B C Sheny,A Tapper,G De Lentdecker,S Girgis,G M Chen,V Roinishvili,R Chierici,H Pieta,A Beretvas,V Litvine,J Russ,H Geenen,R Frühwirth,G Majumder,P Fabbricatore,B Curé,D 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doi:10.1007/jhep02(2010)041

Abstract

Measurements of inclusive charged-hadron transverse-momentum and pseudorapidity distributions are presented for proton-proton collisions at sqrt(s) = 0.9 and 2.36 TeV. The data were collected with the CMS detector during the LHC commissioning in December 2009. For non-single-diffractive interactions, the average charged-hadron transverse momentum is measured to be 0.46 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 0.9 TeV and 0.50 +/- 0.01 (stat.) +/- 0.01 (syst.) GeV/c at 2.36 TeV, for pseudorapidities between -2.4 and +2.4. At these energies, the measured pseudorapidity densities in the central region, dN(charged)/d(eta) for |eta| < 0.5, are 3.48 +/- 0.02 (stat.) +/- 0.13 (syst.) and 4.47 +/- 0.04 (stat.) +/- 0.16 (syst.), respectively. The results at 0.9 TeV are in agreement with previous measurements and confirm the expectation of near equal hadron production in p-pbar and pp collisions. The results at 2.36 TeV represent the highest-energy measurements at a particle collider to date.

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