Speaker
Description
Exploring correlations between photon pairs is a challenging frontier in the field of femtoscopic measurements. Unlike hadrons, direct photons escape the hot and dense medium without final-state interactions, carrying pristine information from the earliest moments of the collision. Therefore, they offer a unique possibility to probe the initial space-time dynamics of the system. Additionally, due to the nature of photon correlations, it can be used to estimate the average number of direct photons in high-multiplicity events at the low $p_{T}$ region.
The HADES experiment, part of the FAIR/GSI facility, specialises in dielectron ($e^\pm$) measurements in collisions at beam energies of 1–2 A GeV, allowing for the detection of photons via the conversion method. The experiment’s electromagnetic calorimeter extends its capabilities to real photon detection, paving the way for photon-photon femtoscopy within this energy regime.
Preliminary results for Ag+Ag collision data at $\sqrt{s_{NN}} = 2.55$ GeV will be presented.
