CMS-FWD-10-005

CMS-FWD-10-005 ; CERN-PH-EP-2011-187
Exclusive $\gamma\gamma \to \mu^{+}\mu^{-}$ production in proton-proton collisions at $\sqrt{s}$ = 7 TeV
CMS Collaboration
24 November 2011
J. High Energy Phys. 01 (2012) 052
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 pb $^{−1}$ . For muon pairs with invariant mass greater than 11.5 GeV, transverse momentum $p_{\mathrm{T}} (\mu) >$ 4 GeV and pseudorapidity $\| \eta(\mu) \| <$ 2.1, a fit to the dimuon $p_{\mathrm{T}} (\mu^+\mu^-)$ distribution results in a measured cross section of $\sigma ( \mathrm{ p \to p \mu^+ \mu^- p }) =$ 338 $^{+058}_{-055}$ (stat.) $\pm$ 0.16 (syst.) $\pm$ 0.14 (lumi.) pb, consistent with the theoretical prediction evaluated with the event generator Lpair. The ratio to the predicted cross section is 083 $^{+058}_{-013}$ (stat.) $\pm$ 0.04 (syst.) $\pm$ 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.
Links: e-print arXiv:1111.5536 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; Public twiki page ; HepData record ; CADI line (restricted) ;

Figures	CMS Publications