# Probing initial- and final-state effects with $\mu^{+}\mu^{-}$ pairs produced from $\gamma\gamma$ scattering in PbPb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV with the CMS detector

- Institution: CERN
- Department: Conferences
- Speaker: Shuai Yang
- Year: 2020
- Language: English
- Source: [CERN](https://videos.cern.ch/record/3000482)
- Licence: [CERN](http://copyright.web.cern.ch)
- Who can watch: Teens profiles and older (sources give no ratings; placed by Invisible Network from the source's own words)

The CMS Collaboration reports on new differential measurements of $\gamma\gamma \rightarrow \mu^{+}\mu^{-}$ production in PbPb collisions at $\sqrt{s_{\rm NN}}$ = 5.02~TeV, using data collected during the 2018 LHC run with an integrated luminosity of 1.6~nb$^{-1}$. Photon-photon interactions have been observed in hadronic heavy-ion collisions by STAR and ALTAS experiments at very low transverse momentum ($p_T$) regions and the measured $p_T$ and azimuthal angular correlations of lepton pairs via $\gamma\gamma$ scattering in hadronic events exhibit significant broadening compared to that from vacuum production in ultra-peripheral events. There is still no consensus on the origin of the observed broadening, which is mainly from $p_T$ hardening of initial scattered photons as impact parameter decreases toward central hadronic collisions or final-state electromagnetic modifications of lepton pairs in presence of a QGP medium. In this talk, the azimuthal angular correlations and mass spectra of $\mu^{+}\mu^{-}$ pairs via $\gamma\gamma$ scattering will be presented as a function of centrality and rapidity. The centrality dependence of $\gamma\gamma \rightarrow \mu^{+}\mu^{-}$ production provides key insight to the origin of observed broadening for photon-photon produced lepton pairs in hadronic collisions while rapidity dependence constrains the relative contributions from leading order and high order photon-photon interactions to measured $\mu^+\mu^-$ pairs..

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## Lectures

1. [Probing initial- and final-state effects with $\mu^{+}\mu^{-}$ pairs produced from $\gamma\gamma$ scattering in PbPb collisions at $\sqrt{s_{\rm NN}}$ = 5.02 TeV with the CMS detector](https://invisiblenetwork.ai/learn/cern/3000482/e46d87810e00), 21 min (CERN's player)