Speaker
Ruchi Chudasama
(Tata Inst. of Fundamental Research (IN))
Description
Ultraperipheral lead-lead collisions at $\sqrt{s_{_{\mathrm{NN}}}} = 5.02$ TeV produce very large photon fluxes that provide the conditions to study photon-photon fusion processes in phase space regions inaccessible with proton-proton data. Measurements of light-by-light ( LbL) scattering and e+e- (Breit-Wheeler) production in ultraperipheral PbPb collisions with data collected during the 2015 and 2018 LHC runs at CMS will be presented, corresponding to integrated luminosities of about $0.4\,\textrm{nb}^{-1}$ and $1.6\,\textrm{nb}^{-1}$, respectively. The LbL study allows also to carry out competitive searches for axion-like particles (ALPs), decaying into a pair of photons, over the mass range $m_a $= 5--100 GeV.
| Submitted on behalf of a Collaboration? | Yes |
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Authors
CMS Collaboration
Ruchi Chudasama
(Tata Inst. of Fundamental Research (IN))
