Bonn 2020 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 56: Heavy-Ion Collisions and QCD Phases XII

HK 56.2: Talk

Friday, April 3, 2020, 11:30–11:45, J-HS F

Photon and neutral meson measurements with the conversion method in ALICE: Reducing the material budget uncertainty — •Stephan Stiefelmaier for the ALICE collaboration — Physikalisches Institut Heidelberg

One method to measure neutral mesons and direct photons in ALICE is to reconstruct electron-positron pairs from the conversion of photons in the detector material. This approach currently suffers from a 4% systematic uncertainty related to the knowledge of the material budget. A reduction of this uncertainty is key for establishing a signal of thermal direct photons at low pT (1 < pT < 3 GeV/c) and for discriminating between models describing direct-photon production in heavy-ion collisions. We have explored whether the material budget uncertainty can be reduced by calibrating the rest of the detector material using the TPC gas as a well understood reference.