ATLAS CERN-LHC. Measurements of exclusive electron muon events in ATLAS at 8
TeV are used to estimate the exclusive cross section for W+W-, put limits on
anomolous quartic couplings (aQGCs), and limit the cross section for
diffractive Higgs production. The fiducial region is defined as
- |etaLepton| <2.5
- ptLepton >25 (second lepton >20 or >15 for Higgs study)
- exclusivity no other track associated with the electron/muon intersection with pt >0.5
The luminosity is 20.2 (0.4) 1/fb at 8 TeV. Calibration of exclusivity is
data based and e e and mu mu results agree with previous measurements.
The results are
- dimuons > 160 GeV/c2 ratio observed/elastic predicted 3.30 (0.22) (0.06)
- WW sigmaB emuX (gamma gamma) 6.9 (2.2) (1.4) pb consistent with expectation
- anomolous expect pt(emu) >120 expect 0.4 see 1, limits on dim 6 and 8
- Higgs selection expect 3 see 6, UL 95% 1.2 pb
