München 2019 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 34: Heavy-Ion Collisions and QCD Phases VI
HK 34.2: Talk
Wednesday, March 20, 2019, 14:30–14:45, HS 15
Photon-photon scattering in the resonance region at midrapidity at the LHC — •Rainer Schicker — Phys. Inst., Heidelberg
A study is presented to extend the measurements of photon-photon scattering in ultra-peripheral Pb-Pb collisions at the LHC into the diphoton mass range 0.4 < Wγγ < 5 GeV. The elementary photon-photon scattering cross section discussed in Ref.1 is extended to these low masses which include the pseudoscalar resonances η and η’. The main background to two-photon final states, arising from double π0 production with two of the four decay photons escaping detection, is examined, and possible kinematical conditions are discussed to suppress the background for such measurements at midrapidity. The residual background is subtracted by a sideband subtraction such that the signal-to-background ratio is larger than one (S/B > 1) in the considered range of diphoton masses.
Ref.1:
M. Klusek-Gawenda, P. Lebiedowicz, A. Szczurek,
Phys.Rev.C93 (2016) no.4, 044907.