Exclusive γγ → μ + μ − production in proton-proton collisions at $ \sqrt {s} = {7} $ TeV
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Abstract
A measurement of the exclusive two-photon production of muon pairs in proton-proton collisions at s = 7 TeV, pp p + -p, is reported using data corresponding to an integrated luminosity of 40 pb -1 . For muon pairs with invariant mass greater than 11.5 GeV, transverse momentum p T () > 4 GeV and pseudorapidity |()| < 2.1, a fit to the dimuon p T ( + -) distribution results in a measured cross section of (p p + -p) = 3.38 +0.58 -0.55 (stat.) 0.16 (syst.) 0.14 (lumi.) pb, consistent with the theoretical prediction evaluated with the event generator Lpair. The ratio to the predicted cross section is 0.83 +0.14 -0.13 (stat.) 0.04 (syst.) 0.03 (lumi.). The characteristic distributions of the muon pairs produced via fusion, such as the muon acoplanarity, the muon pair invariant mass and transverse momentum agree with those from the theory.
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