Speaker
Description
Multidimensional and one-dimensional Bose–Einstein correlations (BEC) are measured in proton–proton collisions at $\sqrt s$ 8 TeV with the ATLAS detector at the LHC. The BEC are the correlations between two identical bosons (a consequence of the symmetry of identical bosons wave function). In particle physics, through a detailed study of the two-particle Bose-Einstein correlations, one can determine the spatial and temporal characteristics of the boson source that make it possible to analyze the characteristics of the hadronization region and allow the determination of the size and shape of the source, which particles are emitted from. The studies of the dependence of BEC on the particle multiplicity $n_{sel}$ are of particular interest, because they help in the understanding the multiparticle production mechanisms. The correlation functions are extracted in terms of different components of the relative momentum of the pair, in order to investigate the extension of the emission source in different directions. Correlation radii $R$ and chaoticity parameter $\lambda$ are determined for different regions of charged-particle multiplicity using a double-ratio technique and exponential parametrization of the correlation function $C_{2}$. The results are presented for different intervals of particle multiplicity $n_{sel}$ of the collision. The radii of the source increase with increasing multiplicity and chaoticity parameter decreases with increasing multiplicitywhich is consistent with the theory.
