000001033 001__ 1033
000001033 005__ 20180716112035.0
000001033 037__ $$aBELLE2-POSTER-CONF-2018-005
000001033 041__ $$aeng
000001033 100__ $$aFrancesco Tenchini
000001033 245__ $$aDecay Chain Reconstruction in Belle II
000001033 260__ $$aCHEP 2018$$c2018-07-09
000001033 300__ $$a1
000001033 520__ $$aThe Belle II detector will begin its data taking phase in 2018. Featuring a state of the art vertex detector with innovative pixel sensors, it will record collisions of e+e- beams from the SuperKEKB accelerator which is slated to provide luminosities 40x higher than KEKB.  This large amount of data will come at the price of an increased beam background, as well as an operating point providing a lowered Lorentz boost when compared to Belle. This leads to new challenges for analysts seeking to perform precision measurements, as increasingly precise vertex position reconstruction and background rejection power is needed to take advantage of the unprecedented statistics provided. I will discuss the decay reconstruction techniques available to make such measurements possible.  I will present an approach to particle decay reconstruction based on the global fit of the full decay chain, implemented using a Kalman filter. Unlike traditional reconstruction workflows where vertices are individually reconstructed, this technique (first used in BaBar [arXiv:physics/0503191]) is able to fit underconstrained vertices by exploiting well resolved elements elsewhere in the decay chain; this is especially well suited to the treatment of processes with neutral decays. It simultaneously allows for more precise vertex position resolution (directly impacting e.g. time-dependent CP violation measurements), improved background rejection, and increased statistical power through the incorporation of a larger number of decay modes.
000001033 700__ $$aJo-Frederik Krohn
000001033 8560_ $$ffrancesco.tenchini@desy.de
000001033 8564_ $$uhttps://docs.belle2.org/record/1033/files/BELLE2-POSTER-CONF-2018-005.pdf