Production of pions, kaons and protons in pp collisions√s = 900 gev with Alice at the lhc

The CMS collaboration

Research output: Contribution to journalArticle

170 Citations (Scopus)

Abstract

The production of π+, π-, K+, K-, p, and p at mid-rapidity has been measured in proton-proton 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.

Original languageEnglish
Article number1655
Pages (from-to)1-22
Number of pages22
JournalEuropean Physical Journal C
Volume71
Issue number6
DOIs
StatePublished - 2011

Fingerprint

kaons
Momentum
Protons
pions
protons
Hadrons
momentum
Silicon detectors
collisions
detectors
transverse momentum
hadrons
Energy dissipation
topology
quantum chromodynamics
energy dissipation
chambers
projection
Topology
Detectors

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • Engineering (miscellaneous)

Cite this

Production of pions, kaons and protons in pp collisions√s = 900 gev with Alice at the lhc. / The CMS collaboration.

In: European Physical Journal C, Vol. 71, No. 6, 1655, 2011, p. 1-22.

Research output: Contribution to journalArticle

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abstract = "The production of π+, π-, K+, K-, p, and p at mid-rapidity has been measured in proton-proton 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.",
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AU - Aamodt, K.

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AU - Abrahantes Quintana, A.

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AU - Andrei, C.

AU - Andronic, A.

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AU - Antonioli, P.

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AU - Aronsson, T.

AU - Arsene, I. C.

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AU - Augustinus, A.

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AU - Cherney, Michael G.

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N2 - The production of π+, π-, K+, K-, p, and p at mid-rapidity has been measured in proton-proton 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.

AB - The production of π+, π-, K+, K-, p, and p at mid-rapidity has been measured in proton-proton 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.

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