This page is always under development !
And not always up to date :-)
Ta strona poswiecona jest mojej dzialalnosci naukowej
Dzialalnosc dydaktyczna omowiona jest na
osobnej stronie
See also my dedicated
public talks and presentations page.
What I am working on...
Previous analysis (completed)
For more information and links have a look at:
EUDET pixel telescope
For more results see also:
public talks and presentations.
Contact Interaction analysis of ZEUS 1994-2007 data
Preliminary results
based on 1994-2005 data were submitted to ICHEP'2006.
More details can be found on the
CI analysis page
(ZEUS members only)
Photon Collider beam simulation with CAIN
For more results see also:
public talks and presentations.
Higgs studies at Photon Collider
Production of the Higgs boson at the Photon Collider at
ILC is studied for the SM and MSSM Higgs bosons.
For light SM higgs and MSSM higgs decay to b-quarks is
considered. For heavy SM higgs (above 160 GeV) we consider
decays to WW and ZZ. Simulation of signal and background processes
takes into account higher order corrections, realistic luminosity
spectra and detector effects. Expected precision of the higgs
two-photon-width measurement is estimated. For heavy SM higgs large
interference effects are expected in the WW decay channel. By
reconstructing WW and ZZ final states not only the h->gamma+gamma
partial width but also the relative phase of the scattering amplitude
can be measured. Measurement of the angular distributions for secondary
WW and ZZ decays can be used to study CP properties of the Higgs boson.
Published results:
For more results see also:
public talks and presentations.
Contact Interaction analysis of ZEUS 1994-2000 data
Analysis completed.
ZEUS Collaboration paper
"Search for contact interactions, large extra dimensions and
finite quark radius in ep collisions at HERA" ,
DESY-03-218, Phys.Lett. B591 (2004) 23-41
[hep-ex/0401009]
New physics at THERA
Results contributed to the
THERA appendix of the
TESLA TDR .
The sensitivity of THERA to different contact interaction models
has been studied in detail.
For models conserving parity, scales up to about 18 TeV can be
probed at THERA, extending considerably beyond the existing bounds.
Significant improvement of existing limits is also expected for models
with large extra dimensions.
Effective Plank mass scales up to about 2.8 TeV can be probed.
THERA will be the best machine to study leptoquark properties,
for leptoquark masses up to about 1 TeV.
It will be sensitive to the leptoquark Yukawa couplings down to ~0.01.
You can find more details in:
More about physics at THERA:
Leptoquark Searches at TESLA
Results contributed to the TESLA Technical Design Report
(TDR).
Measurement of the Yukawa couplings of the first-generation leptoquarks
has been studied for e+e- collisions at TESLA, at sqrt(s)=800 GeV.
By combining measurements from different production and decay channels,
determination of Yukawa couplings with precision on the few per-cent level
is possible.
TESLA will be sensitive to very small leptoquark Yukawa couplings
not accessible at LHC, down to ~0.05 e.
Distinction between left-handed and right-handed Yukawa
couplings is feasible even for leptoquark masses very close to the
pair-production kinematic limit.
You can find more details in:
More about e+e- physics at TESLA:
Leptoquark Searches at Future Colliders
Leptoquark searches are considered for future experiments at HERA,
Tevatron, LHC, TESLA and THERA.
Expected exclusion limits from direct leptoquark searches
(leptoquark pair production and single leptoquark production)
are compared with indirect limits expected from the contact interaction
analysis.
Strongest limits on the leptoquark masses and couplings are
expected from high luminosity LHC data.
If the leptoquark signal suggested by the existing data is detected at LHC,
with mass below 1 TeV, TESLA will be an ideal place to study leptoquark
properties, provided that the leptoquark Yukawa coupling is not too small.
You can find more details in:
Global Leptoquark Analysis
Using data from HERA, LEP and the Tevatron,
as well as from low energy
experiments I try to constrain the Yukawa couplings
for scalar and vector leptoquarks
in the Buchmuller-Ruckl-Wyler effective model.
Some leptoquark models are found to describe the existing experimental data
much better than the Standard Model.
Assuming that a real leptoquark signal is observed,
calculated is an allowed region in the lambda-M plane.
The leptoquark signal is mostly resulting from the new data
on the atomic parity violation in cesium,
but is also supported by recent LEP2 measurements,
unitarity violation in the CKM matrix
and HERA high-Q2 results.
You can find more details in:
Global Contact Interaction Analysis
Using data from HERA, LEP and the Tevatron,
as well as from low energy
experiments I try to constrain the scale of possible electron-quark
contact interactions. For specific models mass scale limits
range up to about 18 TeV. Using the contact interaction
framework, I extract limits on possible "new physics" effects at HERA,
LEP (TESLA) and the Tevatron.
You can find more details in:
Analysis of ZEUS data 1994-97
I was involved in the measurement of the High-x/High-Q²
NC and CC DIS cross-sections, and in the search for
the Lepto-quark production and Contact Interactions.
Have a look at:
I was also involved in search for diffractive CC DIS events.
You can have a look at: