Although transverse-mass scaling of femtoscopic radii is found to hold to a good approximation in heavy-ion collision experiments, it is seen to fail for high-energy proton-proton collisions. It is ...shown that if invariant radius parameters are plotted versus the transverse velocity instead, scaling with the transverse velocity is seen in s = 7 TeV proton-proton experiments. A simple semi-classical model is shown to qualitatively reproduce this transverse velocity scaling.
The feasibility of using π K S 0 femtoscopy to experimentally study the K 0 * ( 700 ) resonance is considered. The K 0 * ( 700 ) resonance is challenging to study due to its broad width and proximity ...in mass to the K * ( 892 ) , both of which predominantly decay via the πK channel. One of the main interests in the K 0 * ( 700 ) is that it is considered a candidate for a tetraquark state. It is proposed to use two-particle femtoscopic methods with π K S 0 pairs produced in proton-proton and heavy ion collisions assuming a strong final-state interaction between them due to elastic scattering and/or via the K 0 * ( 700 ) resonance. Calculations of π K S 0 correlation functions are made to estimate the strength of these final-state interactions and to see if this signal can be adequately separated from the K * ( 892 ) background. A possible signature of diquark versus tetraquark behavior of the K 0 * ( 700 ) final-state interaction is also discussed.
With studies of heavy ion and pp physics already under way at the LHC, it is necessary to consider how hadronic rescattering will affect the observed results from experiments. Through the use of a ...simple relativistic kinematics-based hadron rescattering model we show that the hadron rescattering phase can obscure some signals for radial flow in pp collisions at LHC energies. It is shown that the hadron rescattering model does not distort pseudorapidity distributions for pp collisions at , 7, 10 and 14 TeV, but does effect two-boson Hanbury-Brown Twiss (HBT) observables. We also compare HBT results from the model with recent measurements of ππ HBT in 0.9 TeV pp collisions. We show that there is very good agreement between the rescattering model and experiment in terms of multiplicity dependence of 1D HBT radii. There is also considerable agreement between the two on the kT dependence of 1D HBT radii. Predictions are also made for 1D and 3D identical pion and kaon correlation functions from pp collisions using the rescattering model for , 7, 10 and 14 TeV. These correlation functions are binned by multiplicity and kT, both separately and together. Fits to these correlation functions indicate that any kT signal of radial flow in pp collisions would be largely obscured by rescattering in the post-hadronization phase.
Comparisons of predictions from two simple event generators followed by a rescattering model are made with pion interferometry data from the STAR experiment. The systematics with impact parameter, ...pair momentum and azimuthal angle are presented and a general agreement with all main trends in the data is demonstrated; however, the experimentally observed approach of the three radius values toward a common value at the highest pair momenta is not found for the model values. In addition, an analysis of source times as derived from the interferometry analysis is presented and a quantitative estimate of the model freeze-out duration times is presented.
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