Aug 12 – 18, 2012
US/Eastern timezone

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Measurements of low-momentum thermal photons in Au+Au collisions with the PHENIX detector

Aug 16, 2012, 4:00 PM
Regency 1/3 and Ambassador

Regency 1/3 and Ambassador

Poster Electroweak probes Poster Session Reception


Benjamin Bannier


Photons are produced at all stages of a nuclear collision. Because of their extremely small interaction rate with the hadronic medium any information they carry about their production environment is accessible nearly undistorted in their final state. Photons are produced in hadronic decays, hard scatterings of initial state partrons, jet-photon conversions and from thermal radiation of the medium. At the lowest photon momenta hadronic decays and thermal production are the dominant sources. Any direct measurement of low-momentum photons is challenging in an electro-magnetic calorimeter due to large backgrounds and measurement uncertainties from hadron contamination in this energy regime. We will present a method for measuring real photons with external conversions with the PHENIX detector that allows measurements of these photons with improved systematic uncertainties.

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