Associated Production Evidence against Higgs Impostors and Anomalous Couplings

Abstract

There is still no proof that the new particle $X$ recently discovered by the ATLAS and CMS Collaborations indeed has spin zero and positive parity, as confidently expected. We show here that the energy dependence of associated $W/Z+X$ production would be much less for a $J^P=0^{+}$ boson with minimal couplings, such as the Higgs boson of the Standard Model, than for a spin-two particle with graviton-like couplings or a spin-zero boson with non-minimal couplings. The $W/Z+(X\to \bar{b}b)$ signal apparently observed by the CDF and D0 Collaborations can be used to predict the cross section for the same signal at the LHC that should be measured under the spin-two and different spin-zero hypotheses. The spin-two prediction exceeds by an order of magnitude the upper limits established by the ATLAS and CMS Collaborations, which are consistent with the minimal $0^{+}$ prediction, thereby providing {\it secunda facie} evidence against spin-two Higgs impostors. Similar analyses of energy dependences provide evidence against $0^{-}$ impostors, non-minimal scalar boson couplings, including the best LHC limits on dimension-six operators. Comparing the LHC vector boson fusion cross sections at 7 and 8 TeV in the centre of mass provides additional but weaker evidence in favour of the identification of the $X$ particle as a $J^P=0^{+}$ boson with minimal couplings.

15 pages, 7 figures

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• Higher dimensional operators and LHC Higgs data : the role of modified kinematics
• Effective field theory approach to LHC Higgs data
• Higgs characterisation via vector-boson fusion and associated production: NLO and parton-shower effects
• Modified Higgs Sectors and NLO Associated Production
• Higgs Physics: It ain't over till it's over
• Higher Order QCD predictions for Associated Higgs production with anomalous couplings to gauge bosons
• $ttH$ Anomalous Coupling in Double Higgs Production
• Implications of LHC data on 125GeV Higgs-like boson for the Standard Model and its various extensions
• NNLO QCD corrections to associated $WH$ production and $H\to b\bar{b}$ decay
• Exploring SMEFT in VH with Machine Learning
• New Observables for CP Violation in Higgs Decays
• Higgs form factors in Associated Production
• Gravity-mediated (or Composite) Dark Matter Confronts Astrophysical Data
• Probing CP-violating Higgs and gauge boson couplings in the Standard Model effective field theory
• Impact of gluon polarization on Higgs plus jet production at the LHC
• Jet substructure and probes of CP violation in Vh production
• Exploration of the Tensor Structure of the Higgs Boson Coupling to Weak Bosons in $e^{+}{e}^{-}$ Collisions
• Cornering a Hyper Higgs: Angular Kinematics for Boosted Higgs Bosons with Top Pairs
• Higgs Spin Determination in the WW channel and beyond
• Distinguishing CP-odd couplings of the Higgs boson to weak boson pairs
• Benchmarks for Higgs Effective Theory: Extended Higgs Sectors
• Three loop form factors of a massive spin-2 particle with nonuniversal coupling
• Perturbative Higgs CP violation, unitarity and phenomenology
• Constraints on models for the Higgs boson with exotic spin and parity in $\mathbf{VH}\to \mathbf{Vb}\bar{\mathbf{b}}$ final states
• On the compatibility of the diboson excess with a gg-initiated composite sector
• On the presentation of the LHC Higgs Results
• Constraining Higgs Properties in Associated Production