Speaker
Description
Abstract:
Neutral pions and photons play a crucial role in the LHCb physics program since they are used in a variety of physics analyses. These particles are not electrically charged and therefore cannot be detected by the tracking system. Instead, their energy and position can only be measured by the electromagnetic calorimeter sub-detector (ECAL).
During Run I and Run II, energy and position measurements were taken by analyzing the energy deposits in a 3x3 cluster centered on the ECAL cell with the maximum energy deposition. However, ongoing studies are exploring the optimal cluster shape to use for the current Run III period.
Considering that LHCb will be operating at 5 times more luminosity in Run III, there will be more occupancy in the detector, resulting in more frequent overlaps between 3x3 clusters and a higher pile-up effect from external particles hitting the detector cells. This will lead to a loss in resolution for both position and energy measurements.
To address this, using smaller cluster shapes, such as 2x2 or SwissCross, can reduce those effects resulting in better measurement resolution. It's worth noticing that reducing the cluster size is a valid solution since the Molière radius of electromagnetic showers in the ECAL is smaller than one cell size, so one cell can contain all the energy from a particle.
The upcoming presentation will cover resolution studies for different cluster shapes under Run III conditions, as well as energy and position corrections that can enhance the overall measurement resolution.
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