The production of π+ ,π− ,K+ ,K− , p, and anti-p at mid-rapidity has been measured in p-p collisions at √s = 900 GeV with the ALICE detector. Particle identification is performed using the specific energy loss in the inner tracking silicon detector and the time projection chamber. In addition, time-of-flight information is used to identify hadrons at higher momenta. Finally, the distinctive kink topology of the weak decay of charged kaons is used for an alternative measurement of the kaon transverse momentum (pt) spectra. Since these various particle identification tools give the best separation capabilities over different momentum ranges, the results are combined to extract spectra from pt = 100 MeV/c to 2.5 GeV/c. The measured spectra are further compared with QCD-inspired models which yield a poor description. The total yields and the mean pt are compared with previous measurements, and the trends as a function of collision energy are discussed.

Production of pions, kaons and protons in pp collisions at √(s)= 900 GeV with ALICE at the LHC

BOSISIO, LUCIANO;BREGANT, MARCO;CAMERINI, Paolo;CATTARUZZA, ENRICO;CONTIN, GIACOMO;FRAGIACOMO, ENRICO;GROSSO, Raffaele;MARGAGLIOTTI, GIACOMO;PIANO, STEFANO;RASHEVSKAYA, IRINA;RUI, RINALDO;VACCHI, Andrea;VENARUZZO, MASSIMO;
2011-01-01

Abstract

The production of π+ ,π− ,K+ ,K− , p, and anti-p at mid-rapidity has been measured in p-p collisions at √s = 900 GeV with the ALICE detector. Particle identification is performed using the specific energy loss in the inner tracking silicon detector and the time projection chamber. In addition, time-of-flight information is used to identify hadrons at higher momenta. Finally, the distinctive kink topology of the weak decay of charged kaons is used for an alternative measurement of the kaon transverse momentum (pt) spectra. Since these various particle identification tools give the best separation capabilities over different momentum ranges, the results are combined to extract spectra from pt = 100 MeV/c to 2.5 GeV/c. The measured spectra are further compared with QCD-inspired models which yield a poor description. The total yields and the mean pt are compared with previous measurements, and the trends as a function of collision energy are discussed.
File in questo prodotto:
Non ci sono file associati a questo prodotto.
Pubblicazioni consigliate

I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.

Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2348313
 Avviso

Registrazione in corso di verifica.
La registrazione di questo prodotto non è ancora stata validata in ArTS.

Citazioni
  • ???jsp.display-item.citation.pmc??? ND
  • Scopus 261
  • ???jsp.display-item.citation.isi??? 213
social impact