Search for heavy resonances decaying into WW in the $$e\nu \mu \nu $$ e ν μ ν final state in pp collisions at $$\sqrt{s}=13$$ s = 13 $$\,\text {TeV}$$ TeV with the ATLAS detector

Abstract

A search for neutral heavy resonances is performed in the W W → eνμν decay channel using pp collision data corresponding to an integrated luminosity of 36.1 fb −1 , collected at a centre-of-mass energy of 13 TeV by the ATLAS detector at the Large Hadron Collider. No evidence of such heavy resonances is found. In the search for production via the quark-antiquark annihilation or gluongluon fusion process, upper limits on σ X × B(X → W W ) as a function of the resonance mass are obtained in the mass range between 200 GeV and up to 5 TeV for various benchmark models: a Higgs-like scalar in different width scenarios, a two-Higgs-doublet model, a heavy vector triplet model, and a warped extra dimensions model. In the vector-boson fusion process, constraints are also obtained on these resonances, as well as on a Higgs boson in the Georgi-Machacek model and a heavy tensor particle coupling only to gauge bosons.

No strong CP violation up to the one-loop level in a two-Higgs-doublet model

“…We firstly consider the limits coming from the search for resonant Z 0 Z 0 pairs by both the ATLAS [19,20,21,22,23] and CMS [24,25,26] Collaborations. This is a good channel to look for the heavy CP-even scalar H, which may decay at tree level as H → Z 0 Z 0 .…”

“…observables arise from the matrix element effecting the trasitionK 0 → K 0 , called M21 . This with f B d = 0.1902 GeV, m B d = 5.280 GeV, B B d = 1.219, and η B d = 0.55.…”

Enhanced di-Higgs boson production in the complex Higgs singlet model

“…For the values of θ 2 allowed by Fig. 1, the direct searches, pp → h 2 ðh 3 Þ → W þ W − do not provide additional restrictions on V 21 [28,29].…”

Revisiting the high-scale validity of the type II seesaw model with novel LHC signature

“…The second most dominant process for the heavy neutral Higgs production at the LHC is through vector boson fusion (VBF). The ATLAS Collaboration searched the signal of heavy neutral Higgs boson through the production via VBF, followed by its decay into pair of vector bosons ðW þ W − Þ and they [55] put a 95% CL bound on σðVBF → HÞ × BRðH → W þ W − Þ pb-m H ðGeVÞ plane. We have checked that all our benchmark points are well within this experimental limit.…”