Elastic scattering of 5 GeV/<i>c</i>pions from<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mmultiscripts><mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:mrow><mml:mprescripts /><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow><mml:mrow /><mml:mrow /></mml:mmultiscripts></mml:mrow></mml:math>

DeMuth, D. M.; Chalmers, Joseph S.

doi:10.1103/physrevc.45.353

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The Hadronic Amplitude1

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1993

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“…In contrast, differential cross sections measured at k = 5 GeV/c [28] give a forward scattering amplitude about a factor of 2 too low when extrapolated to 0 = O'. As there are also problems to reproduce the forward part of this angular distribution by theoretical calculations [28,29], we believe that there is a normalization problem at least with part of these data. Total cross sections measured for energies above 40 GeV show a slight increase [30] with energy.…”

Section: The Hadronic Amplitudementioning

confidence: 95%

Phase shift analysis ofπ±−4He elastic scattering

Brinkmöller

Schaile

1993

Phys. Rev. C

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An energy-dependent phase shift analysis of 7r+-He elastic scattering data up to an energy T = 260 MeV was carried out. Using a careful treatment of Coulomb effects to describe the Coulomb nuclear interference we reexamined the constraints to the 7r-He forward scattering amplitude fo by dispersion relations. This allows a stringent consistency check of the data. A satisfactory description of the data could only be achieved assuming large error bars of the total cross section measurements and allowing normalization factors for the differential cross section data.PACS number(s): 25.80.Dj

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