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First measurement of the exclusive muon pair production at the LHC

Three CP3 members made a novel study at the LHC. For the first time, the measurement of exclusive production of muon pairs has been performed in very demanding conditions of high event pileup (i.e. multiple interactions in one beam crossing). This opens the way for an original and precise luminosity measurement, as well as for unique studies of the high energy photon interactions at the LHC.
By Nicolas Schul on June 28, 2011
Additional information:

The first measurement is reported of the exclusive two-photon production of muon pairs, pp -> p &mu+&mu- p, in proton proton collisions at 7 TeV for an integrated luminosity of 40 pb-1.

Pure QED two-photon lepton pair production at the LHC

For muon pairs with invariant mass above 11.5 GeV, and with pT(&mu) > 4 GeV and |&eta(&mu)|< 2.1, a fit to the pT(&mu&mu) distribution results in a measured partial cross-section of &sigma(pp -> p&mu&mu p) = 3.38+0.58 -0.55(stat.)+- 0.16(syst.)+- 0.14(lumi) pb. The ratio to the predicted value is 0.83+0.14-0.13(stat.)+-0.04(syst.). The statistical uncertainties are correlated with the single proton dissociation background, with values of the signal yield ratio between 0.64 and 1.03 contained within the 1 sigma region.

Reference url: http://cdsweb.cern.ch/record/1361388?ln=en

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