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- W2247336522 abstract "This Letter reports a measurement of the exclusive $gammagammarightarrow ell^+ell^- (ell=e, mu)$ cross-section in proton-proton collisions at a centre-of-mass energy of 7 TeV by the ATLAS experiment at the LHC, based on an integrated luminosity of $4.6$ fb$^{-1}$. For the electron or muon pairs satisfying exclusive selection criteria, a fit to the dilepton acoplanarity distribution is used to extract the fiducial cross-sections. The cross-section in the electron channel is determined to be $sigma_{gammagammarightarrow e^+e^-}^{mathrm{excl.}} = 0.428 pm 0.035 (mathrm{stat.}) pm 0.018 (mathrm{syst.})$ pb for a phase-space region with invariant mass of the electron pairs greater than 24 GeV, in which both electrons have transverse momentum $p_mathrm{T}>12$ GeV and pseudorapidity $|eta|<2.4$. For muon pairs with invariant mass greater than 20 GeV, muon transverse momentum $p_mathrm{T}>10$ GeV and pseudorapidity $|eta|<2.4$, the cross-section is determined to be $sigma_{gammagammarightarrow mu^+mu^- }^{mathrm{excl.}} = 0.628 pm 0.032 (mathrm{stat.}) pm 0.021 (mathrm{syst.})$ pb. When proton absorptive effects due to the finite size of the proton are taken into account in the theory calculation, the measured cross-sections are found to be consistent with the theory prediction." @default.
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