Mr
Caspar Hasner
(Technical University Munich)
27/09/2018, 16:00
Particle Phenomenology
The annihilation cross section of TeV scale dark matter particles
$\chi^0$ with electroweak charges into photons is affected by large quantum
corrections due to Sudakov logarithms and the Sommerfeld effect.
We calculate the semi-inclusive photon energy spectrum in
$\chi^0\chi^0\to \gamma+X$ in the vicinity of the maximal photon
energy $E_\gamma = m_\chi$ with NLL' accuracy in an...
Jonas Wittbrodt
(DESY)
27/09/2018, 16:17
Particle Phenomenology
Since the LHC has not provided us with any hints towards new physics, it is ever more interesting to constrain BSM theories from purely theoretical considerations. Requiring that the electroweak vacuum in any BSM model is at least metastable, can lead to stringent constraints on the parameter space of the model. Many popular extensions of the SM, such as supersymmetry, feature greatly extended...
Dr
Christoph Borschensky
(Eberhard Karls Universität Tübingen)
27/09/2018, 16:34
Particle Phenomenology
Dark matter (DM) makes up around 25% of the matter-energy content of our universe today. However, no evidence for a DM particle has been found so far. Supersymmetry adds an ideal candidate, a Weakly Interacting Massive Particle. To avoid its large parameter space with many parameters being unrelated to DM, such as in the Minimal Supersymmetric Standard Model (MSSM), simplified DM models...
Sebastian Schenk
(Heidelberg University)
27/09/2018, 16:54
Particle Phenomenology
Calculations of multiparticle scattering amplitudes in scalar field theories at high multiplicities exhibit an extremely rapid growth with increasing number of final state particles. This either indicates an end of perturbative behaviour, or possibly even a breakdown of the theory itself. With the discovery of a scalar Higgs boson this has also turned into a problem of the Standard Model.
To...
Mr
Maximilian Ruhdorfer
(Technical University of Munich)
27/09/2018, 17:12
Particle Phenomenology
Non-minimal composite Higgs (CH) models, with additional Goldstone bosons (GB) beside the Higgs, do not only present a solution to the hierarchy problem but could also shed light on the dark matter (DM) puzzle. A realization of this scenario was presented in (arXiv:1707.07685): The symmmetry breaking structure is $SO(7)/SO(6)$ and the DM is a complex GB, stabilized by an exact $U(1)_{\rm DM}$....
