Exclusive Photon-Photon Production of Muon Pairs in Proton-Proton Collisions at sqrt(s)=7 TeV.

摘要

A measurement of the exclusive two-photon production of muon pairs in proton-proton collisions at (radical)s = 7 TeV, pp (yields) p(mu)(sup +)(mu)(sup -)p, is reported using data corresponding to an integrated luminosity of 40 pb(sup -1). For muon pairs with invariant mass greater than 11.5 GeV, transverse momentum p(sub T)((mu)) > 4 GeV and pseudorapidity '(eta)((mu))' < 2.1, a fit to the dimuon p(sub T)((mu)(sup +)(mu)(sup -)) distribution results in a measured cross section of (sigma)(p (yields) p(mu)(sup +)(mu)(sup -)) = 3.38(sub -0.55)(sup +0.58)(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(sub -0.13)(sup +0.14)(stat.) (+-) 0.04(syst.) (+-) 0.03(lumi.). The characteristic distributions of the muon pairs produced via (gamma)(gamma) fusion, such as the muon acoplanarity, the muon pair invariant mass and transverse momentum agree with those from the theory.