L1 calorimeter trigger upgrade: tau performance

After the first long shutdown, the LHC will restart and it will achieve a center-of-mass energy of the collisions of about 13 TeV, an expected instantaneous luminosity larger than $10^{34} cm^{-2} s^{-1}$ and an average number of pile-up (PU) interactions of about 40. The trigger architecture will undergo a full upgrade in order to maintain and improve the trigger performance under these new conditions. It will allow to keep the trigger rate under control and to avoid at the same time a significant increase in trigger thresholds that would have a negative impact on the physics. The expected performance of the trigger upgrade algorithm on the selection of tau leptons decaying into hadrons is shown here.