Physics at a photon collider Page: 3 of 3
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Figure 4. Diagrams contributing to fermion pair
production (y} - ff) in NCQFT.
- das11ed-a ./2=o
Figure 5. ey - ey scattering at fee = 500 GeV
a) Differential cross-section d-/dq for the SM
(dashed line) and for ANC = 500 GeV (a - y -
r/2). The expected statistical uncertainties are
also shown. b) Ratio of the differential cross-
sections d-/d cos O for NCQFT and for the SM.
limit from e+e- scattering is ANC > 142 GeV at
95% confidence level .
A theoretical analysis has been performed of
the processes yy - ff and ey - ey for Lee =
500 fb-1. A transverse momentum greater than
10 GeV and a polar angle in the range 100 <
O < 1700 has been required for the final state
In Fig. 5 the NCQFT effects on the angular
distributions of the final state photons in ey - ey
scattering are shown. The parameters a and y are
related to the Maxwell field tensor . Significant
deviations from the SM can be observed.
Studies of various Higgs scenarios show that a
Photon Collider has a unique potential for Higgs
boson physics over a wide range of masses and
model parameters. Excellent b-tagging and good
energy resolution are very important for the Pho-
ton Collider to suppress background. The ey op-
tion of the Photon Collider is complementary to
the e+e- Linear Collider in discovering effects
from Non-Commutative Field Theories. Many
other topics which can be studied at a Photon
Collider (e.g. SUSY, Leptoquarks, QCD) had to
be omitted in this short summary.
1. J. Gronberg, these proceedings.
2. ECFA/DESY Photon Collider Working
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3. G. Jikia, S. Sbldner-Rembold, Nucl. Inst. and
Meth. A472 (2001) 133; Nucl. Phys. Proc.
Suppl. 82 (2000) 373 (ABS 812).
4. P. Niezurawski, A.F. Zarnecki and M.
Krawczyk, hep-ph/0208234 (ABS 665).
5. P. Niezurawski, A.F. Zarnecki and M.
Krawczyk, hep-ph/0207294 (ABS 155).
6. M. Mihlleitner et al., Phys. Lett. B508 (2001)
311; D. Asner et al., hep-ph/0110320.
7. E. Asakawa, hep-ph/0101234.
8. D. Asner et al., hep-ph/0208219.
9. S. Godfrey, M. Doncheski, hep-ph/0111147;
Phys. Rev. D65 (2002) 015005 (ABS 625).
10. OPAL Physics Note PN500 (ABS 889).
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Soldner-Rembold, Stefan. Physics at a photon collider, article, September 30, 2002; Batavia, Illinois. (digital.library.unt.edu/ark:/67531/metadc742520/m1/3/: accessed January 23, 2019), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.