Feasibility study for a full hadrondic reconstruction of Bs0 mesons with the upgraded ALICE detector

Abstract

This thesis summarizes a simulation study on the feasibility to reconstruct the Bs0 meson in proton-proton collisions at 14 TeV with the ALICE detector after the upgrade planned in 2018-2019. The decay used for this reconstruction is Bs0 -> Ds+Ds- ->φπ+φπ- ->K+K-π+π-. This is a fully hadronic decay, a decay without leptons, which means that all final particles are detectable in the ALICE experiment.

Reconstructing the Bs0 meson in proton-proton collisions would provide a reference frame for the investigation of the properties of the Quark-Gluon Plasma using the beauty quark as a probe. The Quark Gluon Plasma is a highly energetic state of matter, in which the universe is believed to have existed the first microseconds after the Big Bang.

The conclusion of this study is that it would be recommendable to cut out the low-momentum candidates and the ones with a small distance to the decay vertex of the particle for the reconstruction in order to study the Bs0 meson through this decay. The rarity and the detectable fraction of the investigated decay combined make that there will not be a sufficient amount of results for reconstruction. Two alternatives are suggested: Using a trigger for decays including a high-energy electron and an alternative reconstruction possibility using a semi-hadronic decay of Ds mesons.