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Proton-Proton Scattering
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Differential cross sections measurement for the p p --> d pi+ reaction at 850-MeV/c.

The GEM collaboration Betigeri, M. ; Bojowald, J. ; Budzanowski, A. ; et al.
Phys.Rev.C 63 (2001) 044011, 2001.
Inspire Record 551879 DOI 10.17182/hepdata.54884

The present data support a large anisotropy in accordance with phase shift predictions and in contrast to another recent experiment.

4 data tables
Table 1

Measured deuteron angular distribution in the c.m. system. The errors shown are statistical only and there is an additional 10 PCT systematic uncertainty on the overall normalisation.

Table 2

Legendre polynomial coefficients from a second order and fourth order fit.

Table 3

Total cross section from second order fit.

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Total and differential cross-sections of p + p ---> pi+ + d reactions down to 275-keV above threshold

The GEM collaboration Drochner, M. ; Ernst, J. ; Fortsch, S ; et al.
Phys.Rev.Lett. 77 (1996) 454-457, 1996.
Inspire Record 431032 DOI 10.17182/hepdata.19580

The p+p→π++d reaction is studied at excess energies between 0.275 and 3.86 MeV. Differential and total cross section were measured employing a magnetic spectrometer with nearly 4π acceptance in the center of mass system. The measured anisotropies between 0.008 and 0.29 indicate that the p wave is not negligible even so close to threshold. The data are compared to other data offering no evidence for charge symmetry breaking or time reversal violation. The s-wave and p-wave contributions at threshold are deduced.

1 data table
Table 1

The CONST is p-wave contribution to the cross section. The differential cross section is fitted usig the relations 4*pi*D(SIG)/D(OMEGA) = SIG + CONST*P2(COS(THETA)), where P2 denotes the Legendre polynomial.