Diphotons from Diaxions

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Diphotons from Diaxions

Type: Master thesis
Title: Diphotons from Diaxions
Author: Sokolenko, Anastasiia
Issue Date: 2016-06-21
Keywords: 750 GeV diphoton excess
axion-like particle
high energy phenomenology
Abstract: At the end of 2015 two collaborations ATLAS and CMS reported the diphoton excess at the invariant mass 750 GeV. In this work we consider the extension of the Standard Model where this peak can be explained. This model involves a heavy scalar particle and a light scalar particle (axion) that come from the Peccei-Quinn symmetry breaking. Using different experimental data we find the allowed parameter space of the model. We study the possibility to search for the light axion of this model at the intensity frontier experiments and show that, unfortunately, SHiP and NA62 experiments will not be sensitive to the model. At the end we show that this model of 750 GeV excess can be falsified at √(s) = 13 TeV LHC run. We make quantitative predictions for new decay channels involving gauge bosons and one photon plus missing energy.
Supervisor: Boyarsky, Alexey
Faculty: Faculty of Science
Department: Physics (Master)
Specialisation: Theoretical Physics
ECTS Credits: 8
Handle: http://hdl.handle.net/1887/40516

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