The challenge of EtMiss reconstruction at ATLAS

by João Gentil (LIP)

Thursday 2 May 2013, 11:30 → 12:30 UTC

LIP _ Lisbon

In this seminar an overview of the reconstruction of the missing transverse energy (EtMiss) in ATLAS is made. The EtMiss is considered the most sensitive quantity for searches of dark matter and is also important in several SM processes (with neutrinos). A strong effort has been put in place to keep in control all objects (that we define and associate to elementary particles) appearing in a physics event. The EtMiss includes all these objects plus one more coming from soft hadronic interactions needed to have a complete picture of an event. The EtMiss can be easily faked and its resolution degraded by several experimental aspects e.g. pileup, detector defects, dependence of bunch crossing. Without a complete and correct addressing of these issues besides the resulting poorer EtMiss reconstruction it will have a direct impact on physics measurements. The increase in energy and pileup for the next run of the LHC in 2015 will require a continued attention to the EtMiss reconstruction and its performance.

Slides seminarLIP_02May2012.pdf