An important goal of the future PANDA Experiment at FAIR (Darmstadt, Germany) is the investigation of the proton structure. Electromagnetic form factors parameterize the electric and magnetic structure of protons. In the time-like region electromagnetic proton form factors can be accessed experimentally through the annihilation processes ppbar→l+l− (l = e, μ), assuming that the interaction takes place through the exchange of one virtual photon. In frame of the PANDARoot software, which encompasses detector simulation and event reconstruction, the statistical precision at which the proton form factors will be determined at PANDA is estimated for both signal processes ppbar→l+l− (l = e, μ). The signal identification and the suppression of the main background process (ppbar → π+π−) is studied. Different methods have been used to generate and analyse the processes of interest. The results show that time-like electromagnetic proton form factors can be measured at PANDA with high statistical accuracy over a large kinematical region.
In this paper different propagation methods for the extraploation of tracks from the STT to the EMC are studied and a new, momentum and particle type dependent quality cut was introduced to improve the completness and the purity of charged candidates.
The design of straw tube detector modules developed for the PANDA Forward Tracker is
presented. One module consists of 32 straws with 10mm diameter, arranged in two staggered
layers, and has a very low material budget of only 8:8 x10^-4 X0. The overpressure of the working gas
mixture of 1 bar makes the module self-supporting and enables the use of lightweight and compact
support frames. Detection planes in the Forward Tracker consist of modules mounted closely,
without gaps, next to each other on a support frame. A module can be mounted and dismounted
from the frame without the need to remove the neighborig modules, enabling fast repairs. Technical
details of the detector design and the assembly procedure of the straw tubes and the straw modules
as well as results of performed tests of the modules are given.
The PANDA experiment, currently under construction at the Facility for Antiproton and Ion Research (FAIR) in Darmstadt, Germany, addresses fundamental questions in hadron and nuclear physics via interactions of antiprotons with nuclei. It will be installed at the High Energy Storage Ring (HESR), which will provide an antiproton beam with a momentum range of 1.5 - 15 GeV/c and enables a high average interaction rate on the fixed target of 2 x 10^7 events/s. The PANDA experiment adopts a continuous data acquisition and the expected data rate transmitted to a high-bandwidth computing network will be in the order of 200 GB/s. However, in order to select very rare physics processes, an indiscriminate hardware trigger does not suffice. Instead, an online software-based data selection system will be used to achieve a data reduction of a factor 100 - 1000. This demands a highly advanced online analysis due to the high interaction rate which has to deal also with overlapping event data. Scalability and parallelization of the reconstruction algorithms are therefore a particular focus in the development process. An simulation framework called PandaRoot is used to develop and evaluate different reconstruction algorithms for event building, tracking and particle identification as well as to further optimize the detector performance. An overview about PandaRoot and the requirements on the event reconstruction algorithms is presented and algorithms for the event time reconstruction currently under development are discussed.
The design of the Forward Tracker for the Forward Spectrometer of the PANDA experiment is described. The tracker consists of 6 tracking stations, each comprising 4 planar double layers of straw tube detectors, and has a total material budget of only 2% X 0 . Th e straws are made self-supporting by a 1 bar over-pressure of the working gas mixture (Ar/CO 2 ). This allows to use lightweight and compact rectangular support frames for the double layers and to split the frames into pairs of C-shaped half-frames for an easier installation on the beam line.