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

Collaboration Alice , K Aamodt , N Abel , U Abeysekara , A Abrahantes , Tomasz Traczyk

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.
Author Collaboration Alice
Collaboration Alice,,
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, K Aamodt - [Universitetet i Oslo]
K Aamodt,,
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, N Abel - [Universitat Heidelberg]
N Abel,,
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, U Abeysekara - [Creighton University]
U Abeysekara,,
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, A Abrahantes
A Abrahantes,,
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, Tomasz Traczyk (FEIT / AK)
Tomasz Traczyk,,
- The Institute of Control and Computation Engineering
Total number of authors1036
Journal seriesThe European Physical Journal C - Particles and Fields, ISSN 1434-6044, [1434-6052], (A 30 pkt)
Issue year2011
Vol71
No1655
Pages1-22
Publication size in sheets1.05
DOIDOI:10.1140/epjc/s10052-011-1655-9
URL http://www.springerlink.com/content/u382l66nhx64v4g5/fulltext.pdf
Languageen angielski
Score (nominal)30
Score sourcejournalList
Publication indicators Scopus Citations = 180; WoS Impact Factor: 2013 = 5.436 (2) - 2013=4.018 (5)
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