TY  - GEN
TI  - Simulation Studies for Measuring the Soft-Photon Spectrum with the ALICE 3 Forward Conversion Tracker
Y1  - 2025///
N2  - The soft-photon puzzle has been an open problem in high energy particle physics for many years
now. Experiments have been performed in the past to try to measure the soft-photon spectrum of
inelastic m ? n scattering processes. Some measured an excess of a factor 4?8 in terms of the internal
bremsstrahlung spectrum predicted by Low?s theorem, but others measured no excess at all. This
work presents for the first time a full Monte Carlo simulation with generated internal bremsstrahlung
photons predicted by Low?s theorem propagated through the detector setup of ALICE 3. One of the
goals of the proposed ALICE 3 experiment is to measure the soft-photon spectrum with the use of
the Forward Conversion Tracker through the tracking of e+e? conversion pairs in a separate dipole
magnetic field. Through dedicated studies of the (spatial) origin of the various sources of background,
cuts and vetoes are implemented to minimize its impact on the measurement. These studies show
a significance of 5?10 in the regime of 0.5 < kT < 7.5 MeV/c for the case where the excess is 4
times the predicted internal bremsstrahlung spectrum. A conical modification of the beam pipe is
suggested to reduce the material budget in front of the FCT and as such the kinematic regime where
the significance exceeds 5 is extended to 0.5 < kT < 10 MeV/c for the case where the excess is 4 times
the predicted internal bremsstrahlung spectrum. In this thesis the theory, previous measurements and
the performance of the proposed Forward Conversion Tracker will be discussed.
KW  - ALICE 3
KW  -  Low's theorem
KW  -  soft-photon puzzle
KW  -  Forward Conversion Tracker
KW  -  FCT
CY  - Heidelberg
A1  - van Veen, Casper Arie
UR  - https://archiv.ub.uni-heidelberg.de/volltextserver/36824/
AV  - public
ID  - heidok36824
ER  -