Typ
Konferenz-Proceedings
Gebiet
ATLAS
Autor
P. Bechtle, K. Desch, M. Uhlenbrock, P. Wienemann
Titel
EPS-HEP 2009 Proceedings: Extracting SUSY parameters from LHC measurements using Fittino
Datum
2009-09
Reportnummer
PoS(EPS-HEP 2009)256
Kurzfassung
With the start of the LHC, low-energy Supersymmetry can be probed over the largest part of the theoretically motivated parameter space. We investigate how well the parameters of the MSSM as well as of constrained models such as minimal Supergravity and Gauge Mediated SUSY breaking can be determined already from existing low-energy measurements such as (g−2)μ, rates of rare B- and K-meson decays and cosmological constraints as well as the dark matter density in the Universe. We then study the parameter precision as a function of the integrated luminosity ranging from 1 fb^−1 to 300 fb^−1 at the LHC. We also study the impact of a future linear collider to achieve precision measurements. The theoretical predictions are provided by the codes combined in the MasterCode and SPheno packages. Special emphasis is given to a careful evaluation of the stability of a global χ^2 parameter estimation technique encoded in the Fittino package. This technique is based on the simulated annealing algorithm for global function minimization with error determination from repeated Monte Carlo experiments ("toy fits"). The method is augmented by an efficient scan of the χ^2 hyper-surface in the multi-dimensional parameter space using a Markov-Chain-Monte-Carlo approach.
Link
http://pos.sissa.it/archive/conferences/084/256/EPS-HEP%202009_256.pdf