Speaker
Description
The LHC accelerator is running at unprecedented high instantaneous
luminosities, allowing the experiments to collect a vast amount of
data. However this ashonishing performance comes with a
larger-than-designed number of interactions per crossing of proton
bunches (pile-up). During 2017 values up to 60 interactions per bunch
crossing were routinely achieved and capped by the ability of
experiments to cope with such large occupancy. In the future an
upgraded LHC accelerator (HL-LHC) is expected to routinely provide
even larger instantaneous luminosities, with up to 200 interactions
per bunch crossing. Disentangling the information from a single
interesting proton-proton collision to the others happening in the
same bunch crossing is of critical importance to retain high accuracy
in physics measurements, and it is commonly referred to as pile-up
suppression. In this talk I will review the main challenges and needs
for pileup suppression at the LHC, mostly focusing on the ATLAS and
CMS experiments; I will highlight the techniques used so far and what
is planned in order to cope with the even larger pile-up expected at
the HL-LHC.
