2 Search Results

The measurement of primary π^±, K^±, p and $$\bar{p}$$ 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 aremore » compared with quantum chromodynamics-inspired models, tuned to reproduce also the earlier measurements performed at the LHC. Lastly, the integrated particle yields and ratios as well as the average transverse momenta are compared with results at lower collision energies.« less

We present here the first statistically meaningful results from two-$${K}_{s}^{0}$$ interferometry in heavy-ion collisions at $$\sqrt{{s}_{\mathit{NN}}}=200$$ GeV. A model that takes the effect of the strong interaction into account has been used to fit the measured correlation function. The effects of single and coupled channels were explored. At the mean transverse mass $${\langle}{m}_{T}{\rangle}=1.07$$ GeV, we obtain the values $$R=4.09\pm{}0.46(\mathrm{stat})\pm{}0.31(\mathrm{sys})$$ fm and $${\lambda}=0.92\pm{}0.23(\mathrm{stat})\pm{}0.13(\mathrm{sys})$$, where $$R$$ and λ are the invariant radius and chaoticity parameters, respectively. The results are qualitatively consistent with $${m}_{T}$$ systematics established with pions in a scenario characterized by a strong collective flow.