Photoproduction of Neutral Pions off Protons

The CBELSA/TAPS Collaboration: V. Crede , N. Sparks , A. Wilson , A.V. Anisovich , J.C.S. Bacelar , R. Bantes , O. Bartholomy , D. Bayadilov

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R. Beck Y.A. Beloglazov R. Castelijns H. Dutz D. Elsner R. Ewald F. Frommberger Chr. Funke R. Gregor A. Gridnev E. Gutz W. Hillert P. Hoffmeister I. Jaegle J. Junkersfeld H. Kalinowsky S. Kammer Frank Klein Friedrich Klein E. Klempt M. Kotulla B. Krusche H. Loehner I.V. Lopatin S. Lugert D. Menze T. Mertens J.G. Messchendorp V. Metag M. Nanova V.A. Nikonov D. Novinski R. Novotny M. Ostrick L.M. Pant H. van Pee M. Pfeiffer A. Roy A.V. Sarantsev S. Schadmand C. Schmidt H. Schmieden B. Schoch S. Shende V. Sokhoyan A. Suele V.V. Sumachev T. Szczepanek U. Thoma D. Trnka R. Varma D. Walther Ch. Wendel

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classification ⚛️ nucl-ex hep-exhep-ph

keywords gammaneutralphotoproductionpionsanalysisbeenbonn-gatchinacbelsa

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Photoproduction of neutral pions has been studied with the CBELSA/TAPS detector in the reaction $\gamma p\to p\pi^0$ for photon energies between 0.85 and 2.50 GeV. The $\pi^0$ mesons are observed in their dominant neutral decay mode: $\pi^0\to\gamma\gamma$. For the first time, the differential cross sections cover the very forward region, $\theta_{\rm c.m.}<60^\circ$. A partial-wave analysis of these data within the Bonn-Gatchina framework observes the high-mass resonances $G_{17}$(2190), $D_{13}$(2080), and $D_{15}$(2070).

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Photoproduction of Neutral Pions off Protons

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