{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.132014.v1/t47","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2040546"}},{"@id":"https://doi.org/10.1140/epja/s10050-022-00760-4","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Dataset","author":{"@type":"Organization","name":"A2 Collaboration"},"creator":{"@type":"Organization","name":"A2 Collaboration"},"datePublished":"2022","description":"Helicity-dependent differential cross section on deuteron at Egamma= 936. MeV","distribution":[{"@type":"DataDownload","contentUrl":"https://www.hepdata.net/download/table/1348318/root","description":"ROOT file","encodingFormat":"https://root.cern"},{"@type":"DataDownload","contentUrl":"https://www.hepdata.net/download/table/1348318/yaml","description":"YAML file","encodingFormat":"https://yaml.org"},{"@type":"DataDownload","contentUrl":"https://www.hepdata.net/download/table/1348318/csv","description":"CSV file","encodingFormat":"text/csv"},{"@type":"DataDownload","contentUrl":"https://www.hepdata.net/download/table/1348318/yoda","description":"YODA file","encodingFormat":"https://yoda.hepforge.org"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2040546?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/132014"}],"inLanguage":"en","includedInDataCatalog":{"@id":"https://doi.org/10.17182/hepdata.132014.v1","@type":"DataCatalog","url":"https://www.hepdata.net/record/ins2040546?version=1"},"isPartOf":{"@id":"https://doi.org/10.17182/hepdata.132014.v1","@type":"Dataset","description":"A2 Collaboration at MAMI.\nThe helicity-dependent single $\\pi^0$ photoproduction cross section\non the deuteron and the angular dependence of the double\npolarisation observable E for the quasi-free single $\\pi^0$\nproduction off the proton and the neutron have been measured,\nfor the first time, from the threshold region up to the photon\nenergy 1.4 GeV. The experiment was performed at the tagged\nphoton facility of the MAMI accelerator and used a circularly\npolarised photon beam and longitudinally polarised deuteron target.\nThe reaction products were detected using the large acceptance\nCrystal Ball/TAPS calorimeter, which covered 97% of the full solid\nangle. Comparing the cross section from the deuteron with the sum\nof free nucleon cross sections provides a quantitative estimate of\nthe effects of the nuclear medium on pion production. In contrast,\ncomparison of the E helicity asymmetry data from quasi-free\nprotons off deuterium with data from a free proton target\nindicates that nuclear effects do not significantly affect this\nobservable. As a consequence, it is deduced that the helicity\nasymmetry E on a free neutron can be reliably extracted from\nmeasurements on a deuteron in quasi-free kinematics.\nMain sources of systematic uncertainties come from the target\npolarisation (10%) and from the unpolarised background\nsubtraction (from 2% up to 10%).","name":"Measurement of the helicity dependence for single $\\pi^{0}$ photoproduction from the deuteron","url":"https://www.hepdata.net/record/ins2040546?version=1"},"keywords":"$\\gamma d \\to \\pi^0$ B (B= pn or d), d$\\Delta\\sigma/d\\Omega$, Photoproduction, Polarization, Deuterium","name":"dcs_46","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/132225","version":1}