Yeeha… 5mins ago I finally recieved my contract!
Now the work that already started a week (or four) ago is official!
I am a member of the old and honourable DESY community…
and I’ll be working on the top of physics… or top-physics ;-)
For all non-physicists: it’s just another particle that you don’t know (and care) about ;-)
Well… let’s roll!
Here we go… its my first day as a payed employee at DESY-Zeuthen!
In some way also the first day of my PhD time here.
I got a desk with a view on “Lake Zeuthen”… but this might change after a some time…
and of course I am thinking about rearranging the desks in my office anyway (as always in new offices)…
Well now I got to work…
btw the map shows my location (also on Google-Maps)… I’ll post some pictures later on!
Cheers
After treading water for a too long time, I finally made up my mind and came to a decision concerning my (near) future! I guess it probably was the hardest I ever had to take.
Not to put you on the rack for too long…
its not Copenhagen,
its not Paris,
its not Freiburg,
its BERLIN!
Right! I’m gonna stay in Berlin for (at least) the next three years! It was a tough decision and took a while to be made.
Anyway… now I’m gonna do my Ph.D. at Humboldt-University of Berlin and DESY Deutsches Elektronen-Synchrotron in Zeuthen.
It will be about top-quark physics and data-quality monitoring using the higher-level-trigger of ATLAS.
And since this is not enough!
I’m also moving, since we already cancelled our old apartment, due to the fact that I would end up in Freiburg according to the original plan.
The new apartment, located in Berlin-Friedrichshain, will of course be opened with a little house-warming party… I’ll give more details!
I’m the master… yeah, right!
Last Friday (February 23rd) I got my “Master of Science (Physics)” degree at the Niels-Bohr-Institute in Copenhagen.
After now in total 5,5 years of physics studies I am finally done…
Now it’s time for the next step… a PhD in physics!
With a request from the Niels-Bohr-Institute (Copenhagen) and offers from Sacley (Paris), DESY-Zeuthen (Berlin) and the University of Freiburg, I got quite a selection… actually quite too big!
I’ll post my new address when I got it… so be expectant!
For now I am facing some troubles that I have to cope with first…
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).
