153 research outputs found
CP violation in bilinear R-parity violation and its consequences for the early universe
Supersymmetric models with bilinear R-parity violation (BRpV) provide a
framework for neutrino masses and mixing angles to explain neutrino oscillation
data. We consider CP violation within the new physical phases in BRpV and
discuss their effect on the generation of neutrino masses and the decays of the
lightest supersymmetric particle (LSP), being a light neutralino with mass
GeV, at next-to-leading order. The decays affect the lepton and via
sphaleron transitions the baryon asymmetry in the early universe. For a rather
light LSP, asymmetries generated before the electroweak phase transition via
e.g. the Affleck-Dine mechanism are reduced up to two orders of magnitude, but
are still present. On the other hand, the decays of a light LSP themselves can
account for the generation of a lepton and baryon asymmetry, the latter in
accordance to the observation in our universe, since the smallness of the BRpV
parameters allows for an out-of-equilibrium decay and sufficiently large CP
violation is possible consistent with experimental bounds from the
non-observation of electric dipole-moments.Comment: 26 pages, 13 figure
Hunting scalar partners of the Higgs boson at the LHC
Composite Higgs models with a fermionic ultraviolet completion predict in
general additional pseudo Nambu Goldstone bosons beside the Higgs multiplet. In
this contribution we discuss their LHC signatures and present first bounds in
simplified models which can also be applied to generic models like multi-Higgs
models. We then demonstrate how these can be combined taking a concrete model
based on the SU(5)/SO(5) coset as an example. We use this to show how a proper
combination of different channels can lead to an improved bound compared to a
single channel analysis.Comment: Contribution to the Corfu Summer Institute 2022 "School and Workshops
on Elementary Particle Physics and Gravity
- …