{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.140672.v2","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2660186"}},{"@id":"https://doi.org/10.1103/PhysRevC.108.055204","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"GlueX Collaboration"},"creator":{"@type":"Organization","name":"GlueX Collaboration"},"datePublished":"2023","description":"The GlueX experiment at Jefferson Lab studies photoproduction of mesons using linearly polarized $8.5\\,\\text{GeV}$ photons impinging on a hydrogen target which is contained within a detector with near-complete coverage for charged and neutral particles. We present measurements of spin-density matrix elements for the photoproduction of the vector meson $\\rho$(770). The statistical precision achieved exceeds that of previous experiments for polarized photoproduction in this energy range by orders of magnitude. We confirm a high degree of $s$-channel helicity conservation at small squared four-momentum transfer $t$ and are able to extract the $t$-dependence of natural and unnatural-parity exchange contributions to the production process in detail. We confirm the dominance of natural-parity exchange over the full $t$ range. We also find that helicity amplitudes in which the helicity of the incident photon and the photoproduced $\\rho(770)$ differ by two units are negligible for $-t<0.5\\,\\text{GeV}^{2}/c^{2}$.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.140672.v2/t1","@type":"Dataset","description":"Spin-density matrix elements for the photoproduction of $\\rho(770)$ in the helicity system. The first uncertainty is statistical, the second systematic....","name":"rho(770) Spin Density Matrix Elements"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2660186?version=2"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/140672"}],"inLanguage":"en","name":"Measurement of Spin-Density Matrix Elements in $\\rho(770)$ Production with a Linearly Polarized Photon Beam at $E_\\gamma = 8.2\\,-\\,8.8\\,\\text{GeV}$","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2660186?version=2","version":2}