Neutral-pion electroproduction on the proton near threshold
The double-differential coincidence cross section for the reaction {sup 1}H({ital e},{ital e}{prime}{ital p}){pi}{sup 0} has been measured at {ital Q}{sup 2}=0.1(GeV/{ital c}){sup 2} in a range in the invariant mass of 2--14 MeV above threshold. From the angular dependence of the data values of the...
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Veröffentlicht in: | Physical Review Letters 1995-05, Vol.74 (18), p.3561-3564 |
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Hauptverfasser: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | The double-differential coincidence cross section for the reaction {sup 1}H({ital e},{ital e}{prime}{ital p}){pi}{sup 0} has been measured at {ital Q}{sup 2}=0.1(GeV/{ital c}){sup 2} in a range in the invariant mass of 2--14 MeV above threshold. From the angular dependence of the data values of the pion {ital s}-wave multipoles {ital E}{sub 0+} and {ital L}{sub 0+} have been extracted. The results are compared to predictions from chiral perturbation theory and models based on an effective Lagrangian. None of the models is able to describe both the {ital E}{sub 0+} and the {ital L}{sub 0+} multipoles. |
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ISSN: | 0031-9007 1079-7114 |
DOI: | 10.1103/PhysRevLett.74.3561 |