High-statistics study of the reaction γp → p2π0
Creators
- Sokhoyan, V.1
- Pee, H. van1
- Bartholomy, O.1
- Beck, R.1
- Fuchs, M.1
- Funke, C.1
- Hoffmeister, P.1
- Horn, I.1
- Junkersfeld, J.1
- Kalinowsky, H.1
- Klempt, E.1
- Lang, M.1
- Metsch, B.1
- Piontek, D.1
- Schmidt, C.1
- Seifen, T.1
- Szczepanek, T.1
- Thiel, A.1
- Thoma, U.1
- Wendel, C.1
- Gutz, E.2, 1
- Crede, V.3
- Anisovich, A.V.4, 1
- Bayadilov, D.4, 1
- Nikonov, V.A.4, 1
- Novinsky, D.4, 1
- Sarantsev, A.V.4, 1
- Bacelar, J.C.S.5
- Castelijns, R.5
- Loehner, H.5
- Messchendorp, J.G.5
- Shende, S.5
- Bantes, B.6
- Dutz, H.6
- Elsner, D.6
- Ewald, R.6
- Frommberger, F.6
- Hillert, W.6
- Kammer, S.6
- Kleber, V.6
- Klein, Frank6
- Klein, Friedrich6
- Ostrick, M.6
- Schmieden, H.6
- Suele, A.6
- Beloglazov, Y.A.4
- Gridnev, A.B.4
- Lopatin, I.V.4
- Sumachev, V.V.4
- Gregor, R.2
- Lugert, S.2
- Metag, V.2
- Nanova, M.2
- Novotny, R.2
- Pfeiffer, M.2
- Trnka, D.2
- Jaegle, I.7
- Krusche, B.7
- Mertens, T.7
- Kotulla, M.7, 2
- Pant, L.8, 2
- Roy, A.8, 2
- Varma, R.8, 2
- Walther, D.6, 1
- Wilson, A.3, 1
- The CBELSA/TAPS Collaboration
- 1. Universitaet Bonn, Helmholtz-Institut fuer Strahlen- und Kernphysik, Bonn (Germany)
- 2. Universitaet Giessen, II. Physikalisches Institut, Giessen (Germany)
- 3. Florida State University, Department of Physics, Tallahassee (United States)
- 4. Petersburg Nuclear Physics Institute, Gatchina (Russian Federation)
- 5. Kernfysisch Versneller Instituut, Groningen (Netherlands)
- 6. Universitaet Bonn, Physikalisches Institut, Bonn (Germany)
- 7. Universitaet Basel, Institut fuer Physik, Basel (Switzerland)
- 8. BARC, Nucl. Phys. Div., Mumbai (India)
Description
The photoproduction of 2π 0 mesons off protons was studied with the Crystal Barrel/TAPS experiment at the electron accelerator ELSA in Bonn. The energy of photons produced in a radiator was tagged in the energy range from 600 MeV to 2.5 GeV. Differential and total cross sections and pπ 0 π 0 Dalitz plots are presented. Part of the data was taken with a diamond radiator producing linearly polarized photons, and beam asymmetries were derived. Properties of nucleon and Δ resonances contributing to the pπ 0 π 0 final state were determined within the Bonn-Gatchina (BnGa) partial-wave analysis. The data presented here allow us to determine branching ratios of nucleon and Δ resonances for their decays into pπ 0 π 0 via several intermediate states. Most prominent are decays proceeding via Δ(1232)π, N(1440)1/2+ π, N(1520)3/2- π, N(1680)5/2+ π, but also pf0(500), pf0(980), and pf2(1270) contribute to the reaction. (orig.)
Availability note (English)
Available from: http://dx.doi.org/10.1140/epja/i2015-15095-xAdditional details
Identifiers
Publishing Information
- Journal Title
- European Physical Journal. A
- Journal Volume
- 51
- Journal Issue
- 8
- Journal Page Range
- p. 1-29
- ISSN
- 1434-6001
INIS
- Country of Publication
- Germany
- Country of Input or Organization
- Germany
- INIS RN
- 46130827
- Subject category
- S72: PHYSICS OF ELEMENTARY PARTICLES AND FIELDS;
- Resource subtype / Literary indicator
- Numerical Data
- Descriptors DEI
- ANGULAR DISTRIBUTION; BRANCHING RATIO; DALITZ PLOT; DELTA-1232 BARYONS; EXCITATION FUNCTIONS; EXPERIMENTAL DATA; F0-980 MESONS; F2-1270 MESONS; GEV RANGE 01-10; HADRONIC PARTICLE DECAY; INTEGRAL CROSS SECTIONS; MEV RANGE 100-1000; PAIR PRODUCTION; PARTICLE WIDTHS; PHOTON-PROTON INTERACTIONS; PHOTOPRODUCTION; PIONS NEUTRAL; POLARIZATION-ASYMMETRY RATIO; POLARIZED BEAMS; PROTONS
- Descriptors DEC
- BARYONS; BASIC INTERACTIONS; BEAMS; BOSONS; CROSS SECTIONS; DATA; DECAY; DELTA BARYONS; DIAGRAMS; DIFFERENTIAL CROSS SECTIONS; DIMENSIONLESS NUMBERS; DISTRIBUTION; ELECTROMAGNETIC INTERACTIONS; ELEMENTARY PARTICLES; ENERGY RANGE; FERMIONS; FUNCTIONS; GEV RANGE; HADRONS; INFORMATION; INTERACTIONS; MESONS; MEV RANGE; N*BARYONS; NUCLEONS; NUMERICAL DATA; PARTICLE DECAY; PARTICLE INTERACTIONS; PARTICLE PRODUCTION; PARTICLE PROPERTIES; PHOTON-BARYON INTERACTIONS; PHOTON-HADRON INTERACTIONS; PHOTON-NUCLEON INTERACTIONS; PIONS; PSEUDOSCALAR MESONS; SCALAR MESONS; SCATTERPLOTS; TENSOR MESONS
Optional Information
- Collaborations
- The CBELSA/TAPS Collaboration