Charged particle multiplicities in pp interactions at √s = 0.9, 2.36, and 7TeV


Khachatryan V., Sirunyan A. M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., ...Daha Fazla

Journal of High Energy Physics, cilt.2011, sa.1, 2011 (SCI-Expanded) identifier identifier identifier

  • Yayın Türü: Makale / Tam Makale
  • Cilt numarası: 2011 Sayı: 1
  • Basım Tarihi: 2011
  • Doi Numarası: 10.1007/jhep01(2011)079
  • Dergi Adı: Journal of High Energy Physics
  • Derginin Tarandığı İndeksler: Science Citation Index Expanded (SCI-EXPANDED), Scopus
  • Anahtar Kelimeler: Hadron-Hadron Scattering, PROTON-ANTIPROTON COLLISIONS, TRANSVERSE-MOMENTUM, MULTIPARTICLE PRODUCTION, NUCLEUS-NUCLEUS, MINIMUM-BIAS, DISTRIBUTIONS, DEPENDENCE, ENERGY, EVENTS, MODEL
  • İstanbul Üniversitesi Adresli: Evet

Özet

Measurements of primary charged hadron multiplicity distributions are presented for non-single-diffractive events in proton-proton collisions at centre-of-mass energies of √s = 0.9, 2.36, and 7TeV, in five pseudorapidity ranges from |η| < 0.5 to |η| < 2.4. The data were collected with the minimum-bias trigger of the CMS experiment during the LHC commissioning runs in 2009 and the 7TeV run in 2010. The multiplicity distribution at √s = 0.9 TeV is in agreement with previous measurements. At higher energies the increase of the mean multiplicity with √s is underestimated by most event generators. The average transverse momentum as a function of the multiplicity is also presented. The measurement of higher-order moments of the multiplicity distribution confirms the violation of Koba-Nielsen-Olesen scaling that has been observed at lower energies.