### Conveners

#### Lightning talks and "Kos"

- James Catmore (University of Oslo (NO))
- Eirik Gramstad (University of Oslo (NO))

### Description

All students at all stages are warmly invited to show their work in a 5 minute “lightning talk” at an informal evening session on Friday. Slides are welcome (5 slides maximum) or if you prefer to use the board or just speech, this is fine as well.

If you use the board, we will project it onto the screen via a camera.

I would like to present my master thesis project, where I study the phenomenology of a supersymmetric model with sneutrino as the NLSP. I look at the tri-lepton signature, two hadronic taus and one lepton (electron or muon), which in my model comes mostly from slepton-sneutrino production. The aim is to improve detectability of this signal using machine learning instead of traditional...

In this talk we will have a brief look at the two decay modes $B^0_s \rightarrow J/\psi \phi$ and $B^0_s \rightarrow\psi(2S)\phi$ and the measurement of the corresponding ratio. To guarantee identical topologies between the two decays we have chosen to only look at the $\psi(2S)\rightarrow \mu^+\mu^-$ and $J/\psi \rightarrow \mu^+\mu^{-}$ modes. A quick look at the peaking backgrounds $B^0_s...

Structure formation in the cold dark matter scenario predicts a large number of small-scale intragalactic dark halos. The existence of these objects has not yet been verified. Can they be detected through gravitational microlensing?

I would like to sketch some of the features of the method for calculating scattering amplitudes presented by Cachazo, He and Yuan. I will give a brief overview of the complex analysis method to make the integrals more manageable. Lastly, I will also provide an example of how to apply the diagrammatic representation of the integrals to calculate the CHY diagrams.

Recent tension between two cutting edge neutrino oscillation experiments has sparked the idea of environmentally-induced decoherence. This effect alters the oscillation probability, depending on how far the neutrino travels. This search is focused on probing decoherence using the IceCube neutrino observatory, by measuring theta23 for neutrinos which have travelled different distances through...

The top quark is the most massive particle in the Standard Model and the precise measurement of it mass could be the key to unveil new physics. The aim of the analysis is to reduce the uncertainty of the measurement by avoiding the modelling of the hadronic decay of the W from the top events. By using the di-lepton channel and, in particular, 5 leptonic observables sensible to the top quark...

Currently, the method for identifying particles in the ATLAS experiment relies on Likelihood estimates constructed from MC simulations. These are good and efficient, but the method has a few shortcomings compared to using ML algorithms. I will present our work so far in using BDTs to classify electrons, some preliminary results, and some of our future hopes and dreams.