The PANDA (anti-Proton ANnihiliation at DArmstadt) experiment will be one
of the four flagship experiments at the new international accelerator complex
FAIR (Facility for Antiproton and Ion Research) in Darmstadt, Germany.
PANDA will address fundamental questions of hadron physics and quantum
chromodynamics using high-intensity cooled antiproton beams with momenta
between 1.5 and 15 GeV/c and a design luminosity of up to 2×10^32 cm−2 s−1.
Excellent particle identification (PID) is crucial to the success
of the PANDA physics program. Hadronic PID in the barrel region of the
target spectrometer will be performed by a fast and compact Cherenkov
counter using the detection of internally reflected Cherenkov light (DIRC)
technology. It is designed to cover the polar angle range from 22° to 140° and
will provide at least 3 standard deviations (s.d.) π/K separation up to
3.5 GeV/c, matching the expected upper limit of the final state kaon
momentum distribution from simulation.
This documents describes the technical design and the expected performance
of the PANDA Barrel DIRC detector. The design is based on the successful
BaBar DIRC with several key improvements.
The performance and system cost were optimized in detailed detector
simulations and validated with full system prototypes using particle
beams at GSI and CERN. The final design meets or exceeds the PID goal of
clean π/K separation with at least 3 s.d. over the entire phase space of charged
kaons in the Barrel DIRC.
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.
Submitted by d.khaneft on Tue, 10/05/2016 - 10:11.
The results of simulations for future measurements of electromagnetic form factors at \PANDA (FAIR) in frame of the PandaRoot software are reported. The statistical precision at which the proton form factors can be determined is estimated. The signal channel $\bar p p \to e^+ e^-$ is studied on the basis of two different but consistent procedures. The main background is identified in the $\bar p p \to \pi^+ \pi^-$ channel. The suppression of this background, the background versus signal efficiency, and the of the statistical errors on the extracted proton form factors have been also evaluated according to the two different procedures. The comparison with older predictions based on an old framework shows consistency of the results and a slightly better precision is achieved here in a large range of momentum transfer, assuming the nominal conditions of beam and detector performances.
Submitted by a.sanchez on Mon, 11/04/2016 - 10:53.
Nuclear systems with two units of strangeness are still poorly known despite their importance for many strong interaction phenomena.
Stored antiprotons beams in the GeV range represent an unparalleled factory for various hyperon-antihyperon pairs. Their
outstanding large production probability in antiproton collisions will open the floodgates for a series of new studies of systems
which contain two or even more units of strangeness. For the first time, high resolution
gamma-spectroscopy of doubly strange nuclei
will be performed, thus complementing measurements of ground state decays of double hypernuclei at J-PARC or possible decays
of particle unstable hypernuclei in heavy ion reactions. High resolution spectroscopy of multistrange Cascade-atoms are feasible and
even the production of
Omega-atoms will be within reach. The latter might open the door to the s=3 world in strangeness nuclear
physics, by the study of the hadronic
Omega-nucleus interaction. For the first time it will be possible to study the behaviour of anti-Cascade in
nuclear systems under well controlled conditions.