{"@context":"http://schema.org","@id":"https://doi.org/10.17182/hepdata.73504.v1","@reverse":{"isBasedOn":[{"@type":"ScholarlyArticle","identifier":{"@type":"PropertyValue","propertyID":"URL","value":"https://inspirehep.net/literature/1357992"}},{"@id":"https://doi.org/10.1103/PhysRevC.92.024912","@type":"JournalArticle"}]},"@type":"Dataset","additionalType":"Collection","author":{"@type":"Organization","name":"STAR Collaboration"},"creator":{"@type":"Organization","name":"STAR Collaboration"},"datePublished":"2016","description":"BNL-RHIC.  We report on measurements of dielectron ($e^+e^-$) production in Au$+$Au collisions at a center-of-mass energy of 200 GeV per nucleon-nucleon pair using the STAR detector at RHIC. Systematic measurements of the dielectron yield as a function of transverse momentum ($p_{\\rm T}$) and collision centrality show an enhancement compared to a cocktail simulation of hadronic sources in the low invariant-mass region ($M_{ee}<$ 1 GeV/$c^2$). This enhancement cannot be reproduced by the $\\rho$-meson vacuum spectral function. In minimum-bias collisions, in the invariant-mass range of 0.30 $-$ 0.76 GeV/$c^2$, integrated over the full $p_{\\rm T}$ acceptance, the enhancement factor is 1.76 $\\pm$ 0.06 (stat.) $\\pm$ 0.26 (sys.) $\\pm$ 0.29 (cocktail). The enhancement factor exhibits weak centrality and $p_{\\rm T}$ dependence in STAR's accessible kinematic regions, while the excess yield in this invariant-mass region as a function of the number of participating nucleons follows a power-law shape with a power of 1.44 $\\pm$ 0.10. Models that assume an in-medium broadening of the $\\rho$ meson spectral function consistently describe the observed excess in these measurements. Additionally, we report on measurements of $\\omega$ and $\\phi$-meson production through their $e^+e^-$ decay channel. These measurements show good agreement with Tsallis Blast-Wave model predictions as well as, in the case of the $\\phi$-meson, results through its $K^+K^-$ decay channel. In the intermediate invariant-mass region (1.1$<M_{ee}<$ 3 GeV/$c^2$), we investigate the spectral shapes from different collision centralities. Physics implications for possible in-medium modification of charmed hadron production and other physics sources are discussed.","hasPart":[{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t1","@type":"Dataset","description":"Estimated electron purity vs. momentum in 200 GeV Au + Au collisions.","name":"Table 1"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t2","@type":"Dataset","description":"Acceptance correction factor for unlike-sign and like-sign pair difference from 200 GeV Au+Au minimum-bias collisions.","name":"Table 2"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t3","@type":"Dataset","description":"Ratio of the same-event like-sign to the mixed event unlike-sign distributions.","name":"Table 3"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t4","@type":"Dataset","description":"$e^+$ $e^-$ invariant mass pair distributions of signal pairs compared to the inclusive unlike sign and reconstructed background pairs in...","name":"Table 4"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t5","@type":"Dataset","description":"Signal-to-background ratios in minimum bias p+p and Au+Au collisions.","name":"Table 5"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t6","@type":"Dataset","description":"Signal-to-background ratios in central p+p and Au+Au collisions.","name":"Table 6"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t7","@type":"Dataset","description":"Invariant mass spectrum in the STAR acceptance ($p_T^e$ > 0.2 GeV/c, |$\\eta^e$| < 1, and |$y_{ee}$|) from SQRT($s_{NN}$) = 200...","name":"Table 7"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t8","@type":"Dataset","description":"Invariant mass spectrum in the STAR acceptance ($p_T^e$ > 0.2 GeV/c, |$\\eta^e$| < 1, and |$y_{ee}$|) from SQRT($s_{NN}$) = 200...","name":"Table 8"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t9","@type":"Dataset","description":"Invariant mass spectra from SQRT($s_{NN}$ = 200 GeV Au+Au minimum-bias collisions in pT range 0 - 5 GeV/c. The ratio...","name":"Table 9"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t10","@type":"Dataset","description":"Invariant mass spectra from SQRT($s_{NN}$ = 200 GeV Au+Au minimum-bias collisions in pT range 5 - 10 GeV/c. The ratio...","name":"Table 10"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t11","@type":"Dataset","description":"Invariant mass spectra from SQRT($s_{NN}$ = 200 GeV Au+Au minimum-bias collisions in pT range 1 - 1.5 GeV/c. The ratio...","name":"Table 11"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t12","@type":"Dataset","description":"Invariant mass spectra from SQRT($s_{NN}$ = 200 GeV Au+Au minimum-bias collisions in pT range 1.5 - 2 GeV/c. The ratio...","name":"Table 12"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t13","@type":"Dataset","description":"Invariant mass spectra from SQRT($s_{NN}$ = 200 GeV Au+Au minimum-bias collisions integrated. The ratio of dielectron yield over cocktail for...","name":"Table 13"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t14","@type":"Dataset","description":"The integrated dielectron yield as a function of pair pT in invariant mass range 0 - 0.15 GeV/c^2 compared with...","name":"Table 14"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t15","@type":"Dataset","description":"The integrated dielectron yield as a function of pair pT in invariant mass range 0.15 - 0.3 GeV/c^2 compared with...","name":"Table 15"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t16","@type":"Dataset","description":"The integrated dielectron yield as a function of pair pT in invariant mass range 0.3 - 0.76 GeV/c^2 compared with...","name":"Table 16"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t17","@type":"Dataset","description":"The integrated dielectron yield as a function of pair pT in invariant mass range 0.76 - 1.05 GeV/c^2 compared with...","name":"Table 17"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t18","@type":"Dataset","description":"The integrated dielectron yield as a function of pair pT in invariant mass range 1.05 - 1.8 GeV/c^2 compared with...","name":"Table 18"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t19","@type":"Dataset","description":"The integrated dielectron yield as a function of pair pT in invariant mass range 1.8 - 2.8 GeV/c^2 compared with...","name":"Table 19"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t20","@type":"Dataset","description":"The integrated dielectron yield as a function of pair pT in invariant mass range 2.8 to 3.5 GeV/c^2 compared with...","name":"Table 20"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t21","@type":"Dataset","description":"Invariant mass spectra from SQRT($s_{NN}$) = 200 GeV Au+Au collisions in different centralities. The ratio of dielectron yield over cocktail...","name":"Table 21"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t22","@type":"Dataset","description":"Invariant mass spectra from SQRT($s_{NN}$) = 200 GeV Au+Au collisions in different centralities. The ratio of dielectron yield over cocktail...","name":"Table 22"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t23","@type":"Dataset","description":"Invariant mass spectra from SQRT($s_{NN}$) = 200 GeV Au+Au collisions in different centralities. The ratio of dielectron yield over cocktail...","name":"Table 23"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t24","@type":"Dataset","description":"Invariant mass spectra from SQRT($s_{NN}$) = 200 GeV Au+Au collisions in different centralities. The ratio of dielectron yield over cocktail...","name":"Table 24"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t25","@type":"Dataset","description":"The integrated dielectron yield and ratio of dielectron yield over cocktail in different centralities for mass window 0 - 0.15...","name":"Table 25"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t26","@type":"Dataset","description":"The integrated dielectron yield and ratio of dielectron yield over cocktail in different centralities for mass window 0.15 - 0.3...","name":"Table 26"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t27","@type":"Dataset","description":"The integrated dielectron yield and ratio of dielectron yield over cocktail in different centralities for mass window 0.3 - 0.76...","name":"Table 27"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t28","@type":"Dataset","description":"The integrated dielectron yield and ratio of dielectron yield over cocktail in different centralities for mass window 0.76 - 1.05...","name":"Table 28"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t29","@type":"Dataset","description":"The integrated dielectron yield and ratio of dielectron yield over cocktail in different centralities for mass window 1.05 - 1.8...","name":"Table 29"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t30","@type":"Dataset","description":"The integrated dielectron yield and ratio of dielectron yield over cocktail in different centralities for mass window 1.8 - 2.8...","name":"Table 30"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t31","@type":"Dataset","description":"The integrated dielectron yield and ratio of dielectron yield over cocktail in different centralities for mass window 2.8 - 3.5...","name":"Table 31"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t32","@type":"Dataset","description":"Dielectron invariant mass spectra from minimum-bias.","name":"Table 32"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t33","@type":"Dataset","description":"Dielectron invariant mass spectra from the most central (0-10%) collisions that we are able to achieve most statistics at present.","name":"Table 33"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t34","@type":"Dataset","description":"The ratio of the Npart-scaled dielectron yield between minimum-bias and the most central collisions.","name":"Table 34"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t35","@type":"Dataset","description":"Mass spectrum of the excess (data - cocktail) in the low-mass region in Au+Au minimum-bias collisions compared to model calculations.","name":"Table 35"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t36","@type":"Dataset","description":"The yields scaled by Npart for the $\\rho$-like region with the cocktail subtracted.","name":"Table 36"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t37","@type":"Dataset","description":"The Omega-like region without cocktail subtraction as a function of Npart.","name":"Table 37"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t38","@type":"Dataset","description":"The Phi-like region without cocktail subtraction as a function of Npart.","name":"Table 38"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t39","@type":"Dataset","description":"Correlated charm contributions to the dielectron mass spectra for different assumptions of the correlation strength.","name":"Table 39"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t40","@type":"Dataset","description":"Slope parameters Teff versus invariant mass for dielectrons from charm hadron decays.","name":"Table 40"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t41","@type":"Dataset","description":"Omega meson invariant mass distribution from SQRT($s_{NN}$) = 200 GeV Au+Au minimum-bias collisions after subtraction of the combinatorial background using...","name":"Table 41"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t42","@type":"Dataset","description":"Phi meson invariant mass distribution from SQRT($s_{NN}$) = 200 GeV Au+Au minimum-bias collisions after subtraction of the combinatorial background using...","name":"Table 42"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t43","@type":"Dataset","description":"The widths and mass positions of the omega signal from data compared to the values from the PDG and the...","name":"Table 43"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t44","@type":"Dataset","description":"The widths and mass positions of the phi signal from data compared to the values from the PDG and the...","name":"Table 44"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t45","@type":"Dataset","description":"The efficiency and acceptance correction factor as function of pT for mid-rapidity omega and phi mesons.","name":"Table 45"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t46","@type":"Dataset","description":"The pT distributions of the omega meson invariant yields from SQRT($s_{NN}$) = 200 GeV Au+Au minimum-bias collisions.","name":"Table 46"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t47","@type":"Dataset","description":"The pT distributions of the phi meson invariant yields from SQRT($s_{NN}$) = 200 GeV Au+Au minimum-bias collisions.","name":"Table 47"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t48","@type":"Dataset","description":"Unlike-sign/like-sign pair acceptance difference correction factor with the PHENIX phi acceptance compared with the full acceptance.","name":"Table 48"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t49","@type":"Dataset","description":"Efficiency corrected invariant mass spectra calculated using the STAR data filtered with the PHENIX azimuthal angle acceptance. The data points...","name":"Table 49"},{"@id":"https://doi.org/10.17182/hepdata.73504.v1/t50","@type":"Dataset","description":"The same data points compared to theoretical model calculations of medium vector meson and QGP contributions.","name":"Table 50"}],"identifier":[{"@type":"PropertyValue","propertyID":"HEPDataRecord","value":"https://www.hepdata.net/record/ins1357992?version=1"},{"@type":"PropertyValue","propertyID":"HEPDataRecordAlt","value":"https://www.hepdata.net/record/73504"}],"inLanguage":"en","name":"Measurements of Dielectron Production in Au$+$Au Collisions at $\\sqrt{s_{\\rm NN}}$ = 200 GeV from the STAR Experiment","provider":{"@type":"Organization","name":"HEPData"},"publisher":{"@type":"Organization","name":"HEPData"},"url":"https://www.hepdata.net/record/ins1357992?version=1","version":1}