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KVI - Center for Advanced Radiation TechnologyOnderzoek en onderwijsNuclear and Hadron PhysicsResearch

PANDA/BESIII data processing and analysis

Contact person: Johan Messchendorp

The collisions of matter with antimatter at high energies are ideal probes to thoroughly study the formation and structure of subatomic matter. In particular, these collisions are exploited to address fundamental questions related to the strong force such as color confinement and the origin of the mass of visible matter.             The nuclear- and hadron physics group at KVI-CART is involved in on-going experiments using electron-positron collisions, BESIII, in Beijing, China, and in the design and planning of a future experiment, PANDA, with antiproton-proton collisions conducted at the FAIR facility near Frankfurt, Germany. The projects described here are connected to both physics programs and they are oriented towards the development and benchmarking of data processing tools in light of the “big data” challenges: fast data processing via smart algorithms and data-mining techniques to search for buried signals in a haystack of background. The projects require basic skills and interest in programming.

  1. Momentum reconstruction of charged tracks. The PANDA setup includes a particle tracking detector (STT) made of thin scintillation tubes (straws) placed inside a homogeneous magnetic field in the beam (z) direction. Charged particles emerging from the antiproton-proton reaction are bend in the x-y plane by the magnetic field and leave a “track” inside the STT detector. The information of this track is used to reconstruct the momentum of the charged particle. A pattern recognition algorithm based on graph morphology is presently under development by a joint effort of KVI-CART and JBI with the aim to identify these tracks at high processing speeds suited for in-situ operation. In this project, the student will be asked to optimize the reconstruction of the z-momentum of charged tracks.
  2. Efficiency studies of KS decays . The spectroscopy of bound states consisting of a charm-anticharm quark pair, known as charmonium, allows to study the confinement potential between quarks. These studies are carried out at the BESIII experiment in Beijing. Large amounts of data have been harvest in the past years. Our interest lies in measuring the properties of the ground state of charmonium via its strong decay into mesons composed of up, down, and strange quarks. One of these mesons is the long-lived “strange” meson, the KS. In this project, the student will determine the detection and reconstruction efficiency of the decay of the KS into two pions. This will be a crucial input to eventually determine the absolute decay rates of the ground-state of charmonium. The data and reconstruction framework are available for this project together with sufficient expertise in setting up the analysis code.
Laatst gewijzigd:23 maart 2016 10:35