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

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (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 - particles, fields, gravitation, and cosmology, D94(3), 032011. American Physical Society 10.1103/PhysRevD.94.032011

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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 e±μ 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-→e±μX)=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<a0W/Λ²<1.7×10⁻⁶ GeV⁻² and -6.4×10⁻⁶<aCW/Λ²<6.3×10⁻⁶ 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.

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