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Higgs & Top at LHeC
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Description
CERN - Tokyo - Liverpool - Johannesburg - Beijing - Hamburg
Higgs part:
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Satoshi tried charge cut (Q_e = beam electron charge) for invisible decay search.
All of PHP W^+ background was removed by this cut, but W^+je events were not
(since the positron from W^+ escapes in beam pipe). As a result sensitivity
slightly improved from 5.92 to 5.26%. Uta commented maybe we should use
another significance measure (Z) rather than simple S/sqrt(B) (i.e. S/sqrt(S+2B)).
Uta reported from the LHeC conveners' meeting that we should also study
double-energy LHC (HE-LHC) scenario, where Ep=14TeV, and FCC-eh (Ep=50TeV).
For that, LHeC-motivated PDF (LHAPDF) would be suitable (larger
kinematic range).
Chen asked if anyone is looking at H to gamgam or tautau or WW. Uta commented H->tau tau may be promising but is also challenging. Gamma-gamma and WW are more suitable for LHC.
Uta commented that file-sharing system are being tested at Liverpool
in order to share sources/scripts/cards and even MC events between
different institutes (without relying on CERN computer accounts).
Kechen orally reported that he is also interested in BSM/SUSY physics
at ep collider.
We encourage him to contact the conveners, George and Monica.
Top part:
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Orhan reported updates on top FCNC coupling measurement at gamma-P collider.
* presented a comparison of the cross sections for both EPA and LASER photon process,
gamma p —> W+ j at LHeC and FCC-ep based gamma p collisions
* discussed cut efficiency plot, signal significance plot, and invariant mass distributions for three jets
* discussed luminosity case for gamma p collisions,
since ERL+Ring type have been accepted for ep collision in the recent meetings
* have a plan to present a comparison between EPA process (gamma* p -> e-W+j) and
the photon exchange process (including t q gamma vertex)
in the electron proton collisions, e-p -> e-W+j for LHeC and FCC-ep
with detector simulation.
Uta comment on site considerations:
At the Rome FCC workshop, Charlie Cook made a first site study of an interaction of an ERL and the 100 km proton ring,
and Max showed it in his summary talk:
https://indico.cern.ch/event/438866/contributions/1085066/attachments/1258651/1859171/ehsumRome.pdf
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