{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.115140.v2","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1114155"}},{"@id":"https://doi.org/10.1103/PhysRevD.86.032013","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"BaBar Collaboration"},"creator":{"@type":"Organization","name":"BaBar Collaboration"},"datePublished":"2024","description":"A precise measurement of the cross section of the process $e^+e^- \\to \\pi^+\\pi^-(\\gamma)$ from threshold to an `energy of $3$ GeV is obtained with the initial-state radiation (ISR) method using $232$ fb$^{-1}$ of data collected with the BaBar detector at $e^+e^-$ center-of-mass energies near $10.6$ GeV. The ISR luminosity is determined from a study of the leptonic process $e^+e^-\\to\\mu^+\\mu^-(\\gamma)\\gamma_{\\rm ISR}$, which is found to agree with the next-to-leading-order QED prediction to within 1.1%. The cross section for the process $e^+e^-\\to\\pi^+\\pi^-(\\gamma)$ is obtained with a systematic uncertainty of 0.5% in the dominant $\\rho$ resonance region. The leading-order hadronic contribution to the muon magnetic anomaly calculated using the measured $\\pi\\pi$ cross section from threshold to $1.8$ GeV is $(514.1 \\pm 2.2({\\rm stat}) \\pm 3.1({\\rm syst}))\\times 10^{-10}$.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.115140.v2/t1","@type":"Dataset","description":"Bare cross-section $e^+e^-\\rightarrow\\pi^+\\pi^-(\\gamma)$ The cross section values (nb) for 337 CM energy intervals (GeV) from 0.3 to 3 GeV. The...","name":"Bare cross-section"},{"@id":"https://doi.org/10.17182/hepdata.115140.v2/t2","@type":"Dataset","description":"Bare cross-section $e^+e^-\\rightarrow\\pi^+\\pi^-(\\gamma)$ systematic uncertainties contributions and total systematic uncertainties, for 337 CM energy intervals (GeV), from 0.3 to 3...","name":"Bare cross-section systematic uncertainties"},{"@id":"https://doi.org/10.17182/hepdata.115140.v2/t3","@type":"Dataset","description":"Bare cross-section $e^+e^-\\rightarrow\\pi^+\\pi^-(\\gamma)$ statistical covariance matrix, for 337x337 CM energy intervals (GeV), from 0.3 to 3 GeV.","name":"Bare cross-section statistical covariance"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1114155?version=2"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/115140"}],"inLanguage":"en","name":"Precise Measurement of the $e^+ e^- \\to \\pi^+\\pi^- (\\gamma)$ Cross Section with the Initial-State Radiation Method at BABAR","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1114155?version=2","version":2}