Higgs & Top at LHeC

Monday 26 Sept 2016, 11:00 → 13:00 Europe/Zurich

CERN

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

11:00 → 11:10 Update on invisible decay study

Speaker: Satoshi Kawaguchi (Tokyo Institute of Technology (JP))

September_26th.pdf

11:10 → 11:20 Hbb coupling measurement

Speaker: Masahiro Tanaka (Tokyo Institute of Technology (JP))

11:20 → 11:30 Hbb and Hcc using jet lifetime probabilities

Speaker: Uta Klein (University of Liverpool (GB))

11:30 → 11:40 H to phiphi to 4b

Speaker: Mr Chen Zhang (Peking University)

11:40 → 11:50 Single top analysis

Speaker: Xifeng Ruan (University of the Witwatersrand (ZA))

11:50 → 12:00 Status of Wits Studies

Speaker: Mukesh Kumar (University of the Witwatersrand (ZA))

12:00 → 12:10 FCNC top-Higgs couplings

Speaker: hao sun (DaLian University of Technology)

12:10 → 12:20 Probing Top Quark FCNC in gamma p Collisions

Speakers: Orhan CAKIR (Ankara University), Orhan Cakir (University of Ankara (TR)), Orhan Cakir (University of Ankara), Orhan Cakir (University of Ankara (TR)), Prof. Orhan Cakir (Ankara University (TR))

TOPFCNC_EPPPGP_V5.pdf