{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.129292.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/2061074"}},{"@id":"https://doi.org/10.1103/PhysRevC.109.044912","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"PHENIX Collaboration"},"creator":{"@type":"Organization","name":"PHENIX Collaboration"},"datePublished":"2022","description":"BNL-RHIC. The measurement of the direct photon spectrum from Au$+$Au collisions at $\\sqrt{s_{NN}}$ = 200 GeV is presented by the PHENIX collaboration using the external photon conversion technique for 0\\%--93\\% central collisions in a transverse momentum ($p_T$) range of 0.8--10 GeV/$c$. An excess of direct photons, above prompt photon production from hard scattering processes, is observed for $p_T< 6$ GeV/$c$. nonprompt direct photons are measured by subtracting the prompt component, which is estimated as $N_{coll}$-scaled direct photons from p+p collisions at 200 GeV, from the direct photon spectrum. Results are obtained for $0.8<$p_T$<6.0$ GeV/$c$ and suggest that the spectrum has an increasing inverse slope from about 0.2 GeV/$c$ to around 0.4 GeV/$c$ with increasing $p_T$. This indicates a possible sensitivity of the measurement to photons from earlier stages of the evolution of the collision. In addition, like the direct photon production, the $p_T$-integrated nonprompt direct photon yields also follow a power law scaling behavior as a function of collision system size. The exponent, $\\alpha$, for the nonprompt component is found to be consistent with 1.1 with no apparent $p_T$ dependence.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.129292.v1/t1","@type":"Dataset","description":"Direct photon $R_{\\gamma}$, every 20% centrality","name":"Figure 12"},{"@id":"https://doi.org/10.17182/hepdata.129292.v1/t2","@type":"Dataset","description":"Direct photon $R_{\\gamma}$, every 10% centrality","name":"Figure 13"},{"@id":"https://doi.org/10.17182/hepdata.129292.v1/t3","@type":"Dataset","description":"Invariant yield of direct photons, every 10% centrality","name":"Figure 14"},{"@id":"https://doi.org/10.17182/hepdata.129292.v1/t4","@type":"Dataset","description":"Invariant yield of direct photons, every 20% centrality","name":"Figure 15"},{"@id":"https://doi.org/10.17182/hepdata.129292.v1/t5","@type":"Dataset","description":"Invariant yield of nonprompt photons, every 20% centrality","name":"Figure 16"},{"@id":"https://doi.org/10.17182/hepdata.129292.v1/t6","@type":"Dataset","description":"$T_{eff}$ vs charged particle multiplicity","name":"Figure 18"},{"@id":"https://doi.org/10.17182/hepdata.129292.v1/t7","@type":"Dataset","description":"Integrated direct photon yield of 1-5GeV vs charged particle multiplicity","name":"Figure 19"},{"@id":"https://doi.org/10.17182/hepdata.129292.v1/t8","@type":"Dataset","description":"Integrated nonprompt direct photon yield of different $p_T$ integration window vs charged particle multiplicity","name":"Figure 20"},{"@id":"https://doi.org/10.17182/hepdata.129292.v1/t9","@type":"Dataset","description":"Scaling factor $\\alpha$ vs charged particle multiplicity","name":"Figure 21"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins2061074?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/129292"}],"inLanguage":"en","name":"Nonprompt direct-photon production in Au$+$Au collisions at $\\sqrt{s_{_{NN}}}=200$ GeV","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins2061074?version=1","version":1}