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

The ALICE Collaboration; Aamodt, K.; Abel, N.; Abeysekara, U.; Quintana, A. Abrahantes; Alme, Johan; Helstrup, Håvard
Peer reviewed, Journal article
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URI
https://hdl.handle.net/1956/5257
Date
2011-06-15
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  • Department of Physics and Technology [1327]
Original version
European Physical Journal C: Particles and Fields 71(6): 1655   https://doi.org/10.1140/epjc/s10052-011-1655-9
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 (p t) spectra. Since these various particle identification tools give the best separation capabilities over different momentum ranges, the results are combined to extract spectra from p t=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 p t are compared with previous measurements, and the trends as a function of collision energy are discussed.
Description
There are approximately 900 authors. Only a few of them have been given author entries in addition to the Collaboration.
Publisher
Springer
Copyright
©The Author(s) 2011

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