Measuring the ratio of HW W and HZZ couplings through W +W −H production

Abstract

For a generic Higgs boson, measuring the relative sign and magnitude of its couplings with the W and Z bosons is essential in determining its origin. Such a test is also indispensable for the 125-GeV Higgs boson. We propose that the ratio of the HW W and HZZ couplings λ W Z can be directly determined through the W + W − H production, where H denotes a generic Higgs boson, owing to the tree-level interference effect. While this is impractical at the LHC due to the limited sensitivity, it can be done at future e + e − colliders, such as a 500-GeV ILC with the beam polarization P (e − , e + ) = (−0.8, +0.3) in the jj ± bb and ± ± ∓ jj channels. The discovery potential of a general ratio and the power to discriminate it from the SM value are studied in detail. Combining the cross section of e + e − → W + W − H with the measurements of HZZ coupling at the HL-LHC, one can further improve the sensitivity of λ W Z .

Electric dipole moment of Hg199 atom from P , CPYanase1, Yoshinaga2, Higashiyama3 et al. 2019Phys. Rev. D342160View full textAdd to dashboardCite

“…where the isospin symmetry was used. The nucleon matrix elements are phenomenologically derived from the anomalous Ward identity [14,[69][70][71][116][117][118][119][120][121]. Using the latest QCD level inputs [122][123][124], we have p|ūiγ 5 u|p = 180, p|diγ 5 d|p = −170, N |siγ 5 s|N = −5.1, N |ciγ 5 c|N = −0.34, and αs 8π N |G a µν G µν a |N = 400 MeV (N = p, n), with about 30% of theoretical uncertainty [17].…”

Nickel Alloying Significantly Enhances the Power Density of Ruthenium‐Based Supercapacitors

“…Echoing the superior electrochemical properties highlighted in Figures 3 and 4A-B, the high capacitance at 120 Hz (1.31 mF cm À 2 ) outperforms devices fabricated by varied other methods, including vertically aligned graphene on cellulose fibers, [39] vertically aligned CNTs, [10] MXene, [27] and other carbonbased materials. [13,19,44] This result is likely due to the high surface area afforded by the NiRu nanostructures. From the calculated capacitance and resistance at 120 Hz, a very low RC time constant (τ RC ) of 0.31 ms was obtained.…”

H5±±h0 production via vector-boson fusion in the Georgi-Machacek model at hadron colliders

“…The physical Higgs components can be organized into a fiveplet (H ±± 5 , H ± 5 , H 0 5 ), a triplet (H ± 3 , H 0 3 ), and two singlets h 0 and H 0 of the custodial SU (2) V symmetry. These mass eigenstates are given by [7] H ±±…”

“…However, these couplings are absent in the doublet extensions (e.g., the two Higgs doublet model) and are stringently constrained in some other triplet models (e.g., the left-right symmetric model). Thus, a distinct signal of the GM model is the production of a doubly charged Higgs boson with subsequent decay to two same-sign weak gauge bosons at hadron colliders [5].…”

“…In Ref. [7] the custodial symmetry was discussed in the fiveplet Higgs production via vector-boson fusion (VBF) at the LHC. The fiveplet Higgs VBF production, pair production, and associated production with a vector boson at the LHC in the GM model at the QCD next-to-leading order (NLO) including parton shower matching have been studied in Ref.…”