The sensitivity of direct searches for heavy neutral leptons (HNLs) in accelerator-based experiments depends strongly on the particles properties. Commonly used benchmark scenarios are important to ensure comparability and consistency between experimental searches, reinterpretations, and sensitivity studies for different facilities.
In models where the HNLs are primarily produced and decay...
I will discuss the prospects for LHCb to detect light scalars that decay into a pair of displaced kaons, based on JHEP 01 (2020) 115 (arXiv:1910.05225). It is important to note that the Kaon final state is acting as an illustrative example, and depending on the specific scalar mass other decay channels are within LHCb range (e.g. pions, D-mesons).
We describe recently suggested new approach to calculate hadronic branching ratio of a 1-GeV mass scale scalar coupled to the Standard Model particles via Higgs portal. The approach is based on application of the Generalised Distribution Amplitude. The required matrix element is the quark energy momentum tensor between vacuum and S-wave state of a pion pair. It is extracted from experimental...
Collider detectable heavy neutrinos predicted by type I seesaw models are generically expected to be pseudo-Dirac pairs of two almost mass degenerate Majorana neutrinos. The tiny mass splitting is not only directly related to the masses of the light neutrinos but also leads to heavy neutrino-antineutrino oscillations. The observation of such oscillations would allow to quantify the amount of...
Minimal Flavor Violation (MFV) offers an appealing framework for exploring physics beyond the Standard Model. Interestingly, within the MFV framework, a new colorless field that transforms non-trivially under a global SU(3)3 quark flavor group can naturally be stable. Such a new field is thus a promising dark matter candidate, provided it is electrically neutral. We extend the MFV framework...
We revise the production of hypothetical new physics particles in the GeV range via their mixing with neutral mesons — a channel that is important for various extensions of the Standard Model. To do this, we implement the sub-processes of the production via the string fragmentation and decays of heavier mesons in pythia8 and study how the overall flux and kinematic distributions depend on...
