Physics Performance Report for PANDA: Strong Interaction Studies with Antiprotons

Source: arXiv


To study fundamental questions of hadron and nuclear physics in interactions of antiprotons with nucleons and nuclei, the universal PANDA detector will be built. Gluonic excitations, the physics of strange and charm quarks and nucleon structure studies will be performed with unprecedented accuracy thereby allowing high-precision tests of the strong interaction. The proposed PANDA detector is a state-of-the art internal target detector at the HESR at FAIR allowing the detection and identification of neutral and charged particles generated within the relevant angular and energy range. This report presents a summary of the physics accessible at PANDA and what performance can be expected. Comment: 216 pages

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    • "It also plans to study the πN → KKΞ reaction as well as Ω production [25] [26]. At the FAIR facility of GSI, the reaction ¯ pp → ¯ ΞΞ will be studied by the PANDA Collaboration [27]. Quite recently, also lattice QCD calculations of the baryon spectra, including those of Ξ and Ω baryons, have been reported, for example, in Refs. "
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    ABSTRACT: The $\bar{K} N \to K \Xi$ reaction is studied based on an effective Lagrangian approach that includes the hyperon $s$- and $u$-channel contributions as well as the phenomenological contact amplitude. The latter accounts for the rescattering term in the scattering equation and the possible short-range dynamics not included explicitly in the model. Existing data is well reproduced and three above-the-threshold resonances were found to be required to describe the data, namely, the $\Lambda(1890)$, $\Sigma(2030)$, and $\Sigma(2250)$. For the latter resonance we have assumed the spin-parity of $J^P=5/2^-$ and a mass of 2265~MeV. The $\Sigma(2030)$ resonance is critical to achieve a good reproduction of not only the measured total and differential cross sections, but also the recoil polarization asymmetry. More precise data are required before a more definitive statement can be made about the other two resonances, in particular, about the $\Sigma(2250)$ resonance that is introduced to describe a small bump structure observed in the total cross section of $K^- p \to K^+ \Xi^-$. Predictions for the target-recoil asymmetries of the $\bar{K} N \to K \Xi$ reaction are also presented.
    Preview · Article · Mar 2015 · Physical Review C
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    • "The aim is to study QCD phenomena in the non-perturbative regime and to unravel the origin of hadronic masses [2]. A multi-purpose detector for tracking, calorimetry and particle identification is presently being developed to investigate resonances in the charmonium mass region. "
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    ABSTRACT: For the investigation of the charmonium spectrum, yet undiscovered charm-meson states and glueballs, the PANDA detector will be employed at the future FAIR facility. PANDA will contain an electromagnetic calorimeter composed of PbWO4 (PWO) crystals that are cooled to -25°C and coupled to large-area avalanche photodiodes or vacuum phototriodes/-tetrodes. The photosensor signals are continuously digitized by sampling analog-to-digital converters (SADCs) and analyzed online in field programmable gate arrays (FPGAs) that are part of the digitizer module to detect hits and extract energy and time information. The online SADC-data processing algorithm was designed, optimized, and implemented in VHDL for a Xilinx FPGA. In order to estimate the performance of the SADC readout of cooled PWO crystals, several measurements with tagged photons in the energy range of 60 MeV-1.4 GeV were performed. The digital readout improves the energy resolution in particular at low photon energies and simultaneously provides a time resolution below 1 ns for an energy deposition above 80 MeV. The successful application of the online data-processing procedure is an essential step toward the development of a trigger-less readout concept of the data acquisition for the PANDA experiment.
    Preview · Article · Oct 2012 · IEEE Transactions on Nuclear Science
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    • "The detector, shown in figure 1, is divided into a forward spectrometer with a dipole magnet and a target spectrometer with a solenoid magnet [5]. The Cherenkov counters within the target spectrometer take care of the charged particle identification. "
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    ABSTRACT: Cooled antiproton beams of unprecedented intensities in the momentum range of 1.5-15 GeV/c will be used for the PANDA experiment at FAIR to perform high precision experiments in the charmed quark sector. The PANDA detector will investigate antiproton annihilations with beams in the momentum range of 1.5 GeV/c to 15 GeV/c on a fixed target. An almost 4π acceptance double spectrometer is divided in a forward spectrometer and a target spectrometer. The charged particle identification in the latter is performed by ring imaging Cherenkov counters employing the DIRC principle.
    Full-text · Article · Feb 2012 · Journal of Instrumentation
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