Two neutral pion photoproduction off the proton between threshold and 800 MeV

Harter, F. and Ahrens, J. and Beck, R. and Krusche, B. and Metag, V. and Schmitz, M. and Stroher, H. and Walcher, T. and Wolf, M.. (1997) Two neutral pion photoproduction off the proton between threshold and 800 MeV. Physics letters. B, Vol. 401, H. 3-4. pp. 229-233.

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Official URL: http://edoc.unibas.ch/dok/A5261981

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The photoproduction of two neutral pions off the proton has been studied for incident photon energies between E-gamma = a 309 MeV (threshold) and 792 MeV with the TAPS photon spectrometer at the Mainz Microtron MAMI. Both 3 gamma- and 4 gamma-events have been analysed in order to deduce the total p(gamma, 2 pi(0))p cross section, The total cross section is less than 300 nb between threshold and similar or equal to 460 MeV, beyond which it starts to rise to a maximum value of about 11 mu b at around 750 MeV. For the highest energies it starts to decrease again, The 4 gamma-sample has been used to reconstruct 2 neutral pions from the above reaction channel by an invariant mass and a missing mass analysis, After reconstruction of the unobserved proton, a 2 has been obtained, which indicates that the decay chain includes the Delta(1232)-resonance as Dalitz-plot of m(pi 0 pi 0) vs. m(p pi 0)(2) an intermediate state.
Faculties and Departments:05 Faculty of Science > Departement Physik > Physik > Hadronenphysik (Krusche)
UniBasel Contributors:Krusche, Bernd
Item Type:Article, refereed
Article Subtype:Research Article
Note:Publication type according to Uni Basel Research Database: Journal article
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Last Modified:22 Mar 2012 14:26
Deposited On:22 Mar 2012 13:54

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