wow… you’re so not gonna believe this, but I am actually at work at 6h30…
why?! good question!
well… I had a friend (the guy that offered me the job in Paris) visiting Troels’ place (btw. Troels is not here!) for one night, passing through from Les Houches to Marseille…
and his train is leaving at 6h40 this morning!
and since Troels’ floor boards are quite loud… here I am!
this is gonna be so productive ;-)
Yesterday has been my second game for the Pepperonies team in the CERN football league… well to be honest, it should have been… I guess due to the heavy rain, the other team (P&G) didn’t show up.. so we won with an amazing 3-0 this time… better than the last game we drew 1-1 against GoZ0 last time… btw. I scored the one goal saving the point… yeeha!
I am back at particle physics’ heaven: CERN!
Driving down a friend’s car, sleeping at Troels’ and the carholder’s places and doing “some” work at CERN… mainly personal meetings to get started with my new work!
Had a nice view of the moon and venus out of Troels’ window last night…
Finally one of my birthday presents made it up the wall (right in the middle of the sleeping/working room)… well okay it has been there for some days now, but I only managed to express my happyness using this blog now!
It was pain in the a to actually get hold of the poster since it’s only sold in the states and the international support sort of doesn’t exist…
anyhow… isn’t it beautiful?!
IT’S DONE!
“Electron Identification with the TRT
and the
W Boson Mass Measurement at ATLAS”
Thesis submitted for the degree of Candidatus Scientiarum in Physics by Sascha Mehlhase
Abstract
This thesis covers two physics analyses for the ATLAS experiment at CERN.
The first one, describing the mapping and optimisation of the electron identification in the TRT subdetector system, introduces new methods utilising the, so far unused, dE/dx information, carried in the time-over-threshold variable, as well as possible ways of combining this with the current algorithms. Based only on real data, its results will also be of use as input for a tuning of the Monte Carlo simulation of the system. Introducing a probability based approach for particle identification the overall pion rejection factor reaches value from 25 to 70. Especially at low energies an improvement, compared to the current method, of up to 300% is reached.
In the second analysis the systematic error in the W boson mass measurement, due to the theoretical description of real photons emitted by the final states in leptonic decays, is characterised. By observing the effect on parameters used for the mass measurement for successive theory improvements (orders in QED), the overall systematic error has been estimated to be about 8 MeV (5 MeV) for electrons (muons).
