Speaker
Description
Exclusive electron and muon pair production ($\gamma\gamma\to ee/\mu\mu$) is traditionally measured as an LHC standard candle to probe the enigmatic soft QCD physics of proton breakup. Until recently, exclusive tau-lepton pair production ($\gamma\gamma\to \tau\tau$) was overlooked at the LHC. However, its potential sensitivity to the mysterious tau anomalous magnetic moment ($g-2$) has triggered a renaissance of theoretical and experimental activity. Precision is limited by systematic uncertainties dominated by non-perturbative physics in background and signal: hadronic-jet identification, underlying event, pileup modelling, elastic and inelastic photon fluxes, proton breakup from dissociation and rescattering. This highlights the importance of designing measurements to constrain such soft QCD effects underpinning the novel LHC tau $g–2$ program. Based on Beresford, Clawson, Liu [PRD 110 (2024) 092016].
| Track | 4: Soft interactions, non-perturbative QCD |
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