Abstract
The measurement of primary pi ^{pm }, K^{pm }, p and {overline{{p}}} production at mid-rapidity (|y| < 0.5) in proton–proton collisions at sqrt{s}= 7 TeV performed with a large ion collider experiment at the large hadron collider (LHC) is reported. Particle identification is performed using the specific ionisation energy-loss and time-of-flight information, the ring-imaging Cherenkov technique and the kink-topology identification of weak decays of charged kaons. Transverse momentum spectra are measured from 0.1 up to 3 GeV/c for pions, from 0.2 up to 6 GeV/c for kaons and from 0.3 up to 6 GeV/c for protons. The measured spectra and particle ratios are compared with quantum chromodynamics-inspired models, tuned to reproduce also the earlier measurements performed at the LHC. Furthermore, the integrated particle yields and ratios as well as the average transverse momenta are compared with results at lower collision energies.
Highlights
Particle identification is performed using the specific ionisation energy-loss and time-of-flight information, the ringimaging Cherenkov technique and the kink-topology identification of weak decays of charged kaons
Kaons and protons are identified over a wide momentum range by combining the information extracted from the specific ionisation energy loss measured in the inner tracking system (ITS) [11] and in the time projection chamber (TPC) [12], the time of flight measured in the time-of-flight (TOF) detector [13], the Cherenkov radiation measured in the high-momentum particle identification detector (HMPID) [14] and the kink-topology identification of in pthreotwone–akprdoetocanycsoollfiscihoanrsgeadt √kaso=ns.9S0i0mGileaVr maneads2u.r7e6mTeneVts are reported in [15,16,17] and are included, together with lower energy data [18,19,20,21,22,23,24], in the discussion of the evolution of particle production with collision energy
The mid-rapidity (|y| < 0.5) transverse momentum spectra of π + + π −, K + + K − and p + p obtained with the five analysis techniques discussed in Sect. 2, normalised to the number of inelastic collisions NINEL, are reported in the top panel of Fig. 12
Summary
Particle identification is performed using the specific ionisation energy-loss and time-of-flight information, the ringimaging Cherenkov technique and the kink-topology identification of weak decays of charged kaons. Kaons and protons are identified over a wide momentum range by combining the information extracted from the specific ionisation energy loss (dE/dx) measured in the inner tracking system (ITS) [11] and in the time projection chamber (TPC) [12], the time of flight measured in the time-of-flight (TOF) detector [13], the Cherenkov radiation measured in the high-momentum particle identification detector (HMPID) [14] and the kink-topology identification of in pthreotwone–akprdoetocanycsoollfiscihoanrsgeadt √kaso=ns.9S0i0mGileaVr maneads2u.r7e6mTeneVts are reported in [15,16,17] and are included, together with lower energy data [18,19,20,21,22,23,24], in the discussion of the evolution of particle production with collision energy.
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