Searches for exclusively produced W boson pairs in the process pp(γγ)→pW+W-p and an exclusively produced Higgs boson in the process pp(gg)→pHp have been performed using eμ final states. These measurements use 20.2 fb-1 of pp collisions collected by the ATLAS experiment at a center-of-mass energy √s=8 TeV at the LHC. Exclusive production of W+W- consistent with the Standard Model prediction is found with 3.0σ significance. The exclusive W+W- production cross section is determined to be σ(γγ→W+W-→eμX) = 6.9 ± 2.2(stat) ±1.4(sys) fb, in agreement with the Standard Model prediction. Limits on anomalous quartic gauge couplings are set at 95% confidence level as -1.7×10-6 < aW0/Λ2 < 1.7×10−6 GeV−2 and −6.4×10−6 < aWC/Λ2 < 6.3× 0−6 GeV−2. A 95% confidence-level upper limit on the total production cross section for an exclusive Higgs boson is set to 1.2 pb.

Aaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., et al. (2016). Measurement of exclusive γγ → W+W− production and search for exclusive Higgs boson production in pp collisions at √s = 8 TeV using the ATLAS detector. PHYSICAL REVIEW D, 94(032011), 1-32 [10.1103/PhysRevD.94.032011].

Measurement of exclusive γγ → W+W− production and search for exclusive Higgs boson production in pp collisions at √s = 8 TeV using the ATLAS detector

F. Ceradini;B. Di Micco;R. Di Nardo;D. Orestano;F. Petrucci;D. Puddu;