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    Parametrization of the $\bar PP$ Elastic Scattering Differential Cross Section Between 2 GeV/c $\leq P_{lab}\leq$ 16 GeV/c
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    Abstract:
    A parameterization of the $\bar pp$ differential elastic scattering cross section in the beam momentum range from 2 to 16 GeV/c is proposed. The parameterization well describes the existing data including the observed diffraction pattern at four-momentum transfer $|t|$ up to 1.5-2.0 GeV$^2$. It can be used for detailed calculations of the radiation load on the detectors being designed for the PANDA detector at the future FAIR facility in Darmstadt.
    Keywords:
    Parametrization (atmospheric modeling)
    Bar (unit)
    Scattering cross-section
    Section (typography)
    The differential scattering cross section measurements for selected energies between 2 and 19 eV have been re-analysed to obtain phaseshifts and associated errors which are consistent with the measurements. The phaseshifts obtained from different angular distribution measurements are shown to be consistent with each other within their associated errors and are also consistent with the best available phaseshifts determined by theory. These phaseshifts have also been used to determine total and momentum transfer cross sections which are compared with direct determinations of these quantities. The re-analysis of the differential cross section measurements does not reduce the uncertainty which at present exists in the total cross section at lower energies.
    Nuclear cross section
    Scattering cross-section
    Momentum transfer
    Electron scattering
    Citations (19)
    Based on reaction theory, we suggest a useful method for extracting total and partial reaction and capture (complete fusion) cross sections from the experimental elastic and quasi-elastic backscattering excitation functions taken at a single angle. We also propose a method to predict the differential reaction cross section from the observed elastic-scattering angular distribution.
    Scattering cross-section
    Nuclear cross section
    Excitation function
    Citations (10)
    The differential cross section for the reaction p(γ,ηp) has been measured from threshold to 1100 MeV photon laboratory energy. For the first time, the region of the S11(1535) resonance is fully covered in a photoproduction experiment and will allow a precise extraction of its parameters at the photon point. These high precision data together with the already measured beam asymmetry data will provide stringent constraints on the extraction of new couplings of baryon resonances to the η meson.
    Scattering cross-section
    Photon energy
    Beam energy