Summary of the gg Working Group
Convenors: Albert De Roeck,
Michael Krämer,
Maria Krawczyk,
Steve Maxfield,
Stefan Söldner-Rembold
2nd Workshop of Extended ECFA/DESY Study
Krakow
September 2001
Intermediate meetings:
13 December 2001, DESY-Zeuthen
-Technical questions related to a gg collider option at TESLA.
17 December 2001, CERN
- gg physics meeting
For details visit http://www-clued0.fnal.gov/~soldner/lcgg.html
St.Malo Apr 2002 1
St. Malo meeting: Retain format of Krakow:
• gg physics topics discussed in Higgs, SUSY,etc. Working groups.
• gg session devoted to special topics (backgrounds, tools etc.)
Photon Collider technical aspects ( joint session)
V. Telnov A Code for the simulation of luminosities and QED
backgounds at photon colliders
W. Da Silva On the luminosity measurement
K. Mönig Backgrounds and interaction region simulation
A. De Roeck gg backgrounds in SIMDET
gg physics session
G. Moortgat-Pick POWER
M. Krawczyk / M. Krämer Higher order corrections for gg -> bb-bar
F. Krauss Status of the APACIC Monte Carlo:
gg physics and how to match NLO with parton showers
F. Zarnecki Detailed Higgs -> WW and -> bb simulation
A. Finch b tagging in gg -> quarks at the Photon Linear Collider
D. Asner Discussion on the physics at LINX
St.Malo Apr 2002 2
Talks Given in Other Working Groups
Higgs
A.Rosca gg -> H -> bbbar
S.Soldner-Rembold gg -> Higgs -> bbbar
(given by M.Kraemer)
D.Asner Progress on gg -> h* -> hh
SUSY
D. Asner Recent progress on gamma gamma -> charginos
Electroweak and Alternatives
Ilya Ginzburg Anomalous TGB Interactions in e g -> W u and gg ->WW.
(leptonic W decay)+ Search for optimal event selection cuts in
e g -> W u
Generators
T. Ohl CIRCE Version 2.0: Beam Spectra for Simulating
Linear Collider and Photon Collider Physics
St.Malo Apr 2002 3
Talks at the CERN meeting 17 December 2001:
• CLICHE study D. Schulte
• Linx project M. Velasco
• Luminosity Spectra V. Telnov
• CIRCE 2.0 T. Ohl
• QCD I L. Motyka
• QCD II N. Timneanu
• Higgs Physics at a gg collider D. Asner
• Higgs-> gg and WW M. Velasco
• Higgs mass and width determination M. Schmitt
• Higgs Heavy E. Asakawa
• Higgs Heavy M. Muehlleitner
• Study of SM Higgs Boson Production at the Photon Collider at TESLA
P. Niezurawski
• Various potentials of 2HDM and the potential of Photon Collide resolve them
M. Krawzyk or P. Osland
• Anomalous TGC in gg> WW I. Bozovic
• Review of the Zeuthen meeting K. Moenig
• gg Spectra F. Zarnecki
http://www-clued0.fnal.gov/~soldner/lcgg.html
St.Malo Apr 2002 4
gg Tools
• Luminosity spectra:
» PHOCOL spectra V.Telnov
» CIRCE programme T. Ohr
» CompAZ parameterisation F. Zarnecki
• APACIC++/AMEGIC++ for gg
F.Krauss
• New LO parton parameterisation for real g
CJKL (M. Krawczyk)
St.Malo Apr 2002 5
• b-tagging
– (Alex Finch)
• bb background NLO for SM light Higgs
– (SS-R,, A. Rosca)
• bb background LO for SM light Higgs (overlapping events)
– (Piotr Niezurawski)
St.Malo Apr 2002 6
Summary
•Important tools available:
•PHOCOL V. Telnov
•CIRCE T. Ohl
•CompAZ A.F. Zarnecki
Progress in detailed simulations
•Heavy Quark Final State
•b-tagging
•Realistic estimation of background to light Higgs search
•LO →NLO for gg →bb(g)
(rescaled LO works OK (Stefan Soldner-Rembold))
•New parton parameterisation for real g
(improved treatment for heavy quarks à la ACOT)
- However: problem in describing existing gg→bb data
•Heavy Boson Final State
•Sensitivity to interference effects in gg→WW and gg→h→WW
•Other gg collider studies (US)
St.Malo Apr 2002 7