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  1. AUG

    28

    Tuesday

    Nuclear Physics Seminar

    "Probe strong magnetic field in QGP with dielectrons from photon-photon interactions"

    Presented by Zhangbu Xu, BNL

    11 am, Small Seminar Room, Bldg. 510

    Tuesday, August 28, 2018, 11:00 am

    Hosted by: Rongrong Ma

    We presents first measurements of $e^+e^-$ pair production from light-light scattering in non-central heavy ion collisions. The excess yields peak distinctly at low transverse momentum with sqrt() between 40 to 60 MeV/c. The excess yields can be explained only when the photon-photon interactions are included in model calculations. However, the measured pT^2 distributions are significantly broader than model calculation and are different between Au+Au and U+U. Our measurements provide a possible experimental evidence of the existence of strong electromagnetic field. And I will discuss its possible impact on emerging phenomena in hadronic heavy-ion collisions, such as Chiral Magnetic Effect.

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