The first measurements done in ALICE are based on the so-called 'cocktail' method, which is described in very big detail in the first publication listed above (inclusive analysis in pp@7 TeV). In 2013-2014 we have further developed a second method, based on the reconstruction of the photonic background with an invariant mass method. This is described in the HFE p-Pb note (attached here).

Photonic background: invariant mass fits

• Work done by Fabrizio Grosa (GSI summer student, 2014):
  Presentation, report
• Our old hint of a contribution from thermal radiation:
  my Talk at QM2011
• Tools for the analysis (Hd computers): /home/ceres/sma/alice/HFE/MassFits/

PHENIX literature on direct photons:

1. Centrality dependence of low-momentum direct-photon production in Au+Au collisions at sNN‾‾‾√=200 GeV
PHENIX Collaboration ( A. Adare ( Colorado U.) et al. ). May 15, 2014. 11 pp.
e-Print: arXiv:1405.3940 [nucl-ex] | PDF

2. Measurement of Direct Photons in Au+Au Collisions at sNN‾‾‾‾√=200 GeV
PHENIX Collaboration ( S. Afanasiev ( Dubna, JINR) et al. ). May 2012. 7 p p.
Published in Phys.Rev.Lett. 109 (2012) 152302
DOI: 10.1103/PhysRevLett.109.152302
e-Print: arXiv:1205.5759 [nucl-ex] | PDF

3. Observation of direct-photon collective flow in sNN‾‾‾‾√=200 GeV Au+Au collisions
PHENIX Collaboration ( A. Adare ( Colorado U.) et al. ). May 2011. 6 pp.
Published in Phys.Rev.Lett. 109 (2012) 122302
DOI: 10.1103/PhysRevLett.109.122302
e-Print: arXiv:1105.4126 [nucl-ex] | PDF

4. Detailed measurement of the e+e− pair continuum in p+p and Au+Au collisions at sNN‾‾‾‾√=200 GeV and implications for direct photon production
PHENIX Collaboration ( A. Adare ( Colorado U.) et al. ). Dec 2009. 56 pp.
Published in Phys.Rev. C81 (2010) 034911
DOI: 10.1103/PhysRevC.81.034911
e-Print: arXiv:0912.0244 [nucl-ex] | PDF

5. Enhanced production of direct photons in Au+Au collisions at sNN‾‾‾‾√=200 GeV and implications for the initial temperature
PHENIX Collaboration ( A. Adare ( Colorado U.) et al. ). Apr 2008. 6 pp.
Published in Phys.Rev.Lett. 104 (2010) 132301
DOI: 10.1103/PhysRevLett.104.132301
e-Print: arXiv:0804.4168 [nucl-ex] | PDF

-- SilviaMasciocchi - 22 March 2016