Helicity dependent cross sections for the photoproduction of π0π± pairs from quasi-free nucleons
Year: 2023
Type: article
Abstract: Photoproduction of π0π±-pairs from quasifree nucleons bound in the deuteron has been investigated to study the helicity dependence of this reaction. Measurements with a liquid deuterium target were used to extract the unpolarized cross sections for reactions on protons and neutrons. A deuterated, longitudinally polarized solid-butanol target, together with a circularly polarized photon beam, determined the double polarization observable E. From these results the spin-dependent cross sections σ1/2 and σ3/2, corresponding to the anti-parallel and parallel spin configurations of the beam photon and target nucleon, have been derived. The measurements were performed at the Mainz MAMI accelerator with tagged, circularly-polarized photon beams produced via bremsstrahlung from longitudinally polarized electron beams. The reaction products were detected with an almost 4π solid-angle covering calorimeter composed of the Crystal Ball and TAPS detectors, supplemented by plastic scintillation detectors for charged particle identification. The results are sensitive to sequential decays of nucleon resonances via intermediate states and also to the decay of nucleon resonances by emission of charged ρ mesons, and are compared to recent model results.
Source: Physics Letters B
Authors: D. Ghosal, V. Sokhoyan, A. Fix, S. Lutterer, S. Abt, P. Achenbach, F. Afzal, Z. Ahmed, J.R.M. Annand, M. Bashkanov, R. Beck, M. Biroth, N. Borisov, A. Braghieri, W.J. Briscoe, F. Cividini, C. Collicot, S. Costanza, A. Denig, M. Dieterle, A.S. Dolzhikov, E.J. Downie, P. Drexler, S. Fegan, S. Gardner, D.I. Glazier, I. Gorodnov, W. Gradl, M. Günther, D. Gurevich, L. Heijkenskjöld, D. Hornidge, G.M. Huber, N. Jermann, A. Käser, V.L. Kashevarov, M. Korolija, B. Krusche, A. Lazarev, K. Livingston, I.J.D. MacGregor, D.M. Manley, P.P. Martel, Ch. Meier, R. Miskimen, M. Mocanu, E. Mornacchi, C. Mullen, A. Neganov, A. Neiser, M. Ostrick, P. Otte, D. Paudyal, P. Pedroni, A. Powell, G. Reicherz, T. Rostomyan, K. Spieker, O. Steffen, I.I. Strakovsky, A. Thiel, M. Thiel, A. Thomas, M. Unverzagt, Yu.A. Usov, S. Wagner, N.K. Walford, D.P. Watts, D. Werthmüller, J. Wettig, L. Witthauer, M. Wolfes, N. Zachariou
Institutions: University of Basel, Johannes Gutenberg University Mainz, Tomsk Polytechnic University, University of Bonn, University of Regina, University of Glasgow, University of York, Joint Institute for Nuclear Research, Istituto Nazionale di Fisica Nucleare, Sezione di Pavia, George Washington University, Saint Mary's University, University of Pavia, P.N. Lebedev Physical Institute of the Russian Academy of Sciences, Kent State University, University of Liverpool
Language: English
Subfield: Nuclear and High Energy Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: diamond
Funders: National Science Foundation, U.S. Department of Energy, Deutsche Forschungsgemeinschaft, Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung, Russian Science Foundation, Office of Science, Seventh Framework Programme, Natural Sciences and Engineering Research Council of Canada, Science and Technology Facilities Council, Instituto Nazionale di Fisica Nucleare, Nuclear Physics
Awards: MEDIUM ENERGY NUCLEAR PHYSICS, G1228249363, G1861050445, G222768804, PRECISION STUDIES OF QCD AND ELECTRO-WEAK INTERACTIONS, Nuclear Physics Consolidated Grant 21-24 - University of York, Illuminating strongly interacting matter, INVESTIGATIONS OF BARYON SPECTROSCOPY VIA ELECTROMAGNETIC AND HADRONIC SCATTERING, G3795454412, G3895161700, Investigation of the Strong Interaction: Elementary Systems and Nuclei, G4663097347, Investigation of the Strong Interaction: Elementary Systems and Nuclei, Chaire De Recherche Du Canada En Environnement Et Bilan Énergétique., G5599649393, G628552264, DATA ANALYSIS CENTER FOR ELECTROMAGNETIC AND HADRONIC SCATTERING PROCESSES, Investigations of the Strong Interaction, Consolidated Grant, Illuminating strongly interacting matter, Investigations of the Strong Interaction, G722329170, G723336386, G7285675723, BARYON SPECTROSCOPY THROUGH PARTIAL-WAVE ANALYSIS AND MESON PHOTOPRODUCTION, Nuclear Physics Consolidated Grant, IRES -Experimental Nuclear Physics at the Mainz Microtron, Edinburgh Nuclear Physics Group Consolidated Grant Proposal, Hunt for Exotic Particles: Dibaryons, Collaborative Research: COSEE: Ocean Communities in Education And social Networks (COSEE-OCEAN)
OpenAlex ID: W4387955537