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Direct real photons in relativistic heavy ion collisions

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arxiv 1907.08893 v2 pith:QRFMMNLS submitted 2019-07-21 nucl-ex hep-exnucl-th

classification nucl-exhep-exnucl-th
keywords directphotonscollisionsheavyrealtheyrelativisticarguably
verification ladder T0 review T1 audit T2 compute T3 formal
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Direct real photons are arguably the most versatile tools to study relativistic heavy ion collisions. They are produced, by various mechanisms, during the entire space-time history of the strongly interacting system. Also, being colorless, most the time they escape without further interaction, ie they are penetrating probes. This makes them rich in information, but hard to decypher and interpret. This review presents the experimental and theoretical developments related to direct real photons since the 1970s, with a special emphasis on the recently emerged "direct photon puzzle", the simultaneous presence of large yields and strong azimuthal asymmetries of photons in heavy ion collisions, an observation that so far eluded full and coherent explanation.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Rotating synchrotron radiation: Photon emission from magnetized and rotating quark-gluon plasma

    hep-ph 2026-02 conditional novelty 6.0 of 10

    Rotation enhances synchrotron photon emission from negatively charged quarks in a magnetized QGP, producing a low-transverse-momentum v2 that can reduce the direct photon puzzle tension.

  2. Thermal dilepton production within conformal viscous Gubser flow

    hep-ph 2025-06 conditional novelty 5.0 of 10

    Thermal dilepton yields and effective temperatures are computed for conformal viscous Gubser flow, showing larger yields for lower q (larger systems) and higher effective temperatures for smaller systems.

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