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Detection of a hypercharge axion in ATLAS: a Monte-Carlo simulation of a pseudo-scalar particle (hypercharge axion) with electroweak interactions for the ATLAS detector in the large hadron collider at CERN
AUTHOR
Elfgren, Erik
DATE
2000-12-18
DEPARTMENT
-
SUMMARY First, the theoretical context and the motivations for this study are
discussed. In short, the hypercharge axion is introduced to explain the
dominance of matter over antimatter in the universe and the existence of
large-scale magnetic fields.
Second, the phenomenological properties are analyzed and the distinguishing
marks are underlined. These are basically the off-axis products of photons
and Z^0s with an invariant mass equal to that of the axion.
Third, the simulation is carried out with two photons producing the axion
which decays into Z^0s and photons. The event simulation is run through the
simulator ATLFAST of ATLAS (A Toroidal Large Hadron Collider ApparatuS) at
CERN.
Finally, the characteristics of the axion decay are analyzed and the criteria
for detection are presented. A study of the background is also included.
The result is that for certain values of the axion mass and the mass scale
(both in the order of a TeV), the hypercharge axion could be detected in
ATLAS.
This Master of Science thesis treats the hypercharge axion, which is a
hypothetical pseudo-scalar particle with electroweak interactions.
ISSN 1402-1617 / ISRN LTU-EX--00/334--SE / NR 2000:334
