Abstract: Masahiro Kuze

Higgs studies at the LHeC


The Large Hadron-electron Collider (LHeC) is a proposed upgrade program of the LHC, in which, by the default design, an electron beam of 60 GeV from a racetrack-shaped Energy Recovery Linac collides with the 7 TeV LHC proton beam (or the 2.76 TeV lead-ion beam). The baseline luminosity is 10^33 cm^-2s^-1 in ep mode, with studies going on to achieve 10^34 cm^-2s^-1. This new lepton-hadron collider, with much enhanced center-of-mass energy compared to HERA, will bring a variety of physics opportunities that are complementary to LHC physics. Among them, the Higgs studies are particularly interesting. Thanks to cleaner experimental conditions (no pile-up and final state) and due to the lower multi-jet QCD backgrounds compared to pp, the LHeC allows for a clear signal observation in H to bb mode and thus a precision Hbb coupling measurement, which is deemed very challenging at the LHC. With the high luminosity option, rarer channels such as the tau and charm final states are in reach too, and even more ambitious studies such as a search for non-standard Higgs coupling to vector bosons can be considered. A summary of the studies pursued so far will be presented.