Testing the Scalar Triplet Solution to CDF's Fat $W$ Problem at the LHC

Abstract

The Type II Seesaw model remains a popular and viable explanation of neutrino masses and mixing angles. By hypothesizing the existence of a scalar that is a triplet under the weak gauge interaction, the model predicts strong correlations among neutrino oscillation parameters, signals at lepton flavor experiments, and collider observables at high energies. We investigate reports that the Type II Seesaw can naturally accommodate recent measurements by the CDF collaboration, which finds the mass of the $W$ boson to be significantly larger than allowed by electroweak precision data, while simultaneously evading constraints from direct searches. Experimental scrutiny of this parameter space in the Type II Seesaw has long been evaded since it is not characterized by ``golden channels'' at colliders but instead by cascade decays, moderate mass splittings, and many soft final states. In this work, we test this parameter space against publicly released measurements made at the Large Hadron Collider. By employing a newly developed tool chain combining MadGraph5\_aMC@NLO and Contur, we find that most of the favored space for this discrepancy is already excluded by measurements of Standard Model final states. We give suggestions for further exploration at Run III of the LHC, which is now underway.

arXiv comment8 pages (incl. refs.), 3 figures; minor clarifications, matches published version

References in corpus (56)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• FeynRules 2.0 - A complete toolbox for tree-level phenomenology
• Parton distributions for the LHC Run II
• UFO - The Universal FeynRules Output
• FeynRules - Feynman rules made easy
• Event Generation with Sherpa 2.2
• Tuning PYTHIA 8.1: the Monash 2013 Tune
• Automatic Generation of Tree Level Helicity Amplitudes
• Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations
• Distinguishing seesaw models at LHC with multi-lepton signals
• JaxoDraw: A graphical user interface for drawing Feynman diagrams. Version 2.0 release notes
• Robust Independent Validation of Experiment and Theory: Rivet version 3
• Neutrino Masses and the LHC: Testing Type II Seesaw
• Measurement of the $W$-boson mass in pp collisions at $\sqrt{s}=7$ TeV with the ATLAS detector
• Beyond S, T and U
• Single and Pair Production of Doubly Charged Higgs Bosons at Hadron Colliders
• Type II Seesaw at LHC: the Roadmap
• A search for a doubly-charged Higgs boson in pp collisions at sqrt(s) = 7 TeV
• Pair Production of Doubly-Charged Scalars: Neutrino Mass Constraints and Signals at the LHC
• Search for doubly charged Higgs boson production in multi-lepton final states with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Computing decay rates for new physics theories with FeynRules and MadGraph5/aMC@NLO
• Electroweak precision observables and Higgs-boson signal strengths in the Standard Model and beyond: present and future
• Vacuum Stability, Perturbativity, EWPD and Higgs-to-diphoton rate in Type II Seesaw Models
• HEPData: a repository for high energy physics data
• Measurement of the W boson mass
• Testability of Type I Seesaw at the CERN LHC: Revealing the Existence of the B-L Symmetry
• Electroweak Precision Fit and New Physics in light of $W$ Boson Mass
• Impact of the recent measurements of the top-quark and W-boson masses on electroweak precision fits
• Displaced vertex signatures of doubly charged scalars in the type-II seesaw and its left-right extensions
• Production of doubly charged scalars from the decay of singly charged scalars in the Higgs Triplet Model
• First constraint on the mass of doubly-charged Higgs bosons in the same-sign diboson decay scenario at the LHC
• Search for doubly charged scalar bosons decaying into same-sign $W$ boson pairs with the ATLAS detector
• Global analysis of electroweak data in the Standard Model
• Bounds on the mass of doubly-charged Higgs bosons in the same-sign diboson decay scenario
• Testing a Neutrino Mass Generation Mechanism at the Large Hadron Collider
• Majorana Higgses at colliders
• Revisiting Type-II see-saw: Present Limits and Future Prospects at LHC
• Making the small oblique parameters large
• Doubly Charged Higgs Boson Production at Hadron Colliders
• Search for doubly and singly charged Higgs bosons decaying into vector bosons in multi-lepton final states with the ATLAS detector using proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Constraining new physics with collider measurements of Standard Model signatures
• Low scale type II seesaw: Present constraints and prospects for displaced vertex searches
• Type-II Seesaw Triplet Scalar Effects on Neutrino Trident Scattering
• LHC Run-I constraint on the mass of doubly charged Higgs bosons in the same-sign diboson decay scenario
• Testing new physics models with global comparisons to collider measurements: the Contur toolkit
• W-boson mass in the triplet seesaw model
• Measurements of differential cross-sections in four-lepton events in 13 TeV proton-proton collisions with the ATLAS detector
• Towards deconstructing the simplest seesaw mechanism
• Probing Doubly and Singly Charged Higgs at $pp$ Collider HE-LHC
• Electroweak precision tests for triplet scalars
• Search for triboson $W^{\pm }{W}^{\pm }{W}^{\mp }$ production in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurements of $W^{+}{W}^{-}+\ge 1$jet production cross-sections in $pp$ collisions at $\sqrt{s}=13$TeV with the ATLAS detector
• Lower Limits on $\mu \to e\gamma$ from new Measurements on $U_{e3}$
• Tripling down on the $W$ boson mass
• Three-loop QCD corrections to the electroweak boson masses
• Discriminating the HTM and MLRSM models in collider studies via doubly charged Higgs boson pair production and the subsequent leptonic decays

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• Neutrino mass models at $\mu$TRISTAN
• The oblique parameters in the 2HDM with Vector-Like Quarks: Confronting $M_W$ CDF-II Anomaly
• Probing compressed mass spectra in the type-II seesaw model at the LHC
• Anatomy of the Real Higgs Triplet Model
• A twisted tale of the transverse-mass tail
• Precision Higgs Boson Probe of Type-II Seesaw Models
• Accommodating the CDF W-boson Mass Measurement in the Beautiful Mirror Model