Fitting dilepton production data in pp collisions with a dipole form factor model yields Λ² = 0.465 ± 0.056 GeV² (rp = 1.002 ± 0.038 fm), showing sensitivity to proton radius at high masses and forward rapidities but not resolving the puzzle.
Exclusive photon-photon production of muon pairs 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 sqrt(s)= 7 TeV, pp to p mu^+ mu^- p, is reported using data corresponding to an integrated luminosity of 40 inverse picobarns. For muon pairs with invariant mass greater than 11.5 GeV, transverse momentum pT(mu) > 4 GeV and pseudorapidity |eta(mu)| < 2.1, a fit to the dimuon pt(mu^+ mu^-) distribution results in a measured cross section of sigma(pp to p mu^+ mu^- 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 photon-photon fusion, such as the muon acoplanarity, the muon pair invariant mass and transverse momentum agree with those from the theory.
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Sensitivity of the photon-induced processes to the proton radius
Fitting dilepton production data in pp collisions with a dipole form factor model yields Λ² = 0.465 ± 0.056 GeV² (rp = 1.002 ± 0.038 fm), showing sensitivity to proton radius at high masses and forward rapidities but not resolving the puzzle.