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Electroproduction of pi0 on the proton near threshold

Welch, T.P. ; Karen, P.H. ; Mitchell, J.H. ; et al.

Phys.Rev.Lett. 69 (1992) 2761-2764, 1992.

Inspire Record 344040 DOI 10.17182/hepdata.19808

The electroproduction of π0 on the proton was measured from 0 to 2.5 MeV above threshold for virtual-photon 4-momenta of -0.05 and -0.1 (GeV/c)2. The sum of the lowest-order contributing multipoles, a0=‖E0+‖2-εL‖L0+‖2, was determined with a precision an order of magnitude better than previously possible. Our results for a0 are consistent with present calculations. Our extracted value for ‖L0+‖2 at the ‘‘photon point’’ is in agreement with recent predictions.

1 data table

Table 1

Joined statistics for two incident electron energy of 300 and 500 MeV.