Using ultraperipheral lead-lead collisions, a lepton-plus-tracks analysis could constrain the tau anomalous magnetic moment to -0.0080 < a_tau < 0.0046 at 68% CL, three times better than DELPHI.
Photon collider search strategy for sleptons and dark matter at the LHC
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abstract
We propose a search strategy using the LHC as a photon collider to open sensitivity to scalar lepton (slepton $\tilde{\ell}$) production with masses around 15 to 60 GeV above that of neutralino dark matter $\tilde{\chi}^0_1$. This region is favored by relic abundance and muon $(g-2)_\mu$ arguments. However, conventional searches are hindered by the irreducible diboson background. We overcome this obstruction by measuring initial state kinematics and the missing momentum four-vector in proton-tagged ultraperipheral collisions using forward detectors. We demonstrate sensitivity beyond LEP for slepton masses of up to 220 GeV for $ 15 \lesssim \Delta m(\tilde{\ell}, \tilde{\chi}^0_1) \lesssim 60$ GeV with 100 fb$^{-1}$ of 13 TeV proton collisions. We encourage the LHC collaborations to open this forward frontier for discovering new physics.
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New physics and tau $g-2$ using LHC heavy ion collisions
Using ultraperipheral lead-lead collisions, a lepton-plus-tracks analysis could constrain the tau anomalous magnetic moment to -0.0080 < a_tau < 0.0046 at 68% CL, three times better than DELPHI.