Speaker
Prof.
Maria Krawczyk
(Institute of Theoretical Physics, Warsaw University)
Description
Measurement of the heavy neutral MSSM Higgs bosons H and A at the Photon Collider is
considered for the parameter range corresponding to the so-called "LHC wedge". The
main background for the measured process, gamma+gamma->A,H->b+bbar, is due to the
direct heavy-quark production, gamma+gamma->Q+Qbar. Here assumptions and results of
two analyses which take into account NLO QCD corrections to the heavy-quark
production are compared [Phys.Lett. B508 (2001) 311, and hep-ph/0507006]. It is shown
that different approaches to NLO corrections (full resummation of Sudakov and
non-Sudakov logarithms versus resummation of non-Sudakov logarithms up to 4-loop
order) and jet definitions (Sterman-Weinberg vs. JADE) lead to comparable results for
direct heavy-quark production cross sections. The most significant difference is due
to condition for minimal polar angle of quarks in 3-jet events.
Author
Prof.
Maria Krawczyk
(Institute of Theoretical Physics, Warsaw University)
Co-authors
Prof.
Michael Spira
(PSI)
Dr
Piotr NIezurawski
(Warsaw U.)
