CR012 $pp \to (W'/Z'/G' spin-1) \to WW, WZ, ZZ$
Diboson high-mass resonance (generic spin-1) Status REVIEWED VERIFIED High Code: NO Priority Medium
PDG / equivalent values
| Observable | Value | Year | Experiment / source | Provenance |
|---|---|---|---|---|
| HVT model B W' $ \to $ WZ observed resonance-mass lower limit | m(W') > 4.4 TeV 95% CL (lower_limit) | 2023 | CMS | source ↑ |
| HVT model B mass-degenerate V' $ \to $ VV observed resonance-mass lower limit | m(V') > 4.5 TeV for the mass-degenerate VV category 95% CL (lower_limit) | 2023 | CMS | source ↑ |
| HVT model B mass-degenerate V' $ \to $ VV+VH observed resonance-mass lower limit | m(V') > 4.8 TeV when VV and VH channels are combined 95% CL (lower_limit) | 2023 | CMS | source ↑ |
| HVT model B Z' $ \to $ WW observed excluded resonance-mass intervals | m(Z') excluded in 1.3-3.1 TeV and 3.3-3.5 TeV 95% CL (mass_exclusion_intervals) | 2023 | CMS | source ↑ |
Why this constrains the RS scan
Custodial and composite RS models generically contain electroweak KK vectors
whose longitudinal \(W/Z\) branching fractions can be large. The HVT model-B
benchmark is not an RS spectrum calculation, but it is a standard simplified
proxy for strongly coupled vector triplets and is the cleanest public
collider-language bridge for \(W'\) and \(Z'\) diboson searches.
For the RS scan, this is not the leading scale setter. The
internal quark-scan methodology note quotes
\(M_{KK}^{\min}(p50,g_{s*}=3)=47.26~\mathrm{TeV}\) for the low-energy
\(\Delta F=2\)-dominated scan
(
internal\_quark\_scan\_methodology\_extract.txt). A direct LHC
diboson reach of order \(4\)--\(5~\mathrm{TeV}\) is therefore a cross-check and
a handle on non-anarchic, custodial, or otherwise flavor-aligned RS variants,
rather than a competing bound for the default anarchic scan.What's changed since the original paper
Pappadopulo--Thamm--Torre--Wulzer, arXiv:1402.4431, introduced the HVT
framework used by ATLAS and CMS to translate \(VV\) and \(VH\) searches into a
small set of vector-resonance parameters. ATLAS arXiv:1506.00962 then made the
boosted all-hadronic \(WW/WZ/ZZ\) search a central LHC channel and recorded the
well-known 8 TeV \(WZ\)-region fluctuation. CMS arXiv:1705.09171 provided the
first combined \(VV/VH\) HVT interpretation across 8 and early 13 TeV searches.
The 13 TeV all-hadronic searches in ATLAS arXiv:1708.04445 and CMS
arXiv:1708.05379 moved the channel into the multi-TeV regime with boosted
boson-tagging.
The 2019 full-Run-2/partial-Run-2 updates, ATLAS arXiv:1906.08589 and CMS
arXiv:1906.05977, established the modern high-mass all-jets analyses. CMS
arXiv:2109.06055 added an independent semileptonic Run-2 channel for \(WW\),
\(WZ\), and \(WH\). The current all-jets CMS arXiv:2210.00043 result then used
the full Run-2 data set, machine-learning boson taggers, and simultaneous
\(VV/VH\) categories to give the strongest public HVT spin-1 statement used
above.
Validity and model dependence
These are direct-search limits, not model-independent limits on the RS
Kaluza--Klein scale. The HVT interpretation assumes a narrow resonance, a
specific relation between fermion and boson couplings, and production through
the light-quark or vector-boson initial states present in the experimental
templates. In a concrete RS model the mapping depends on the custodial gauge
group, fermion embeddings, brane kinetic terms, total width, and branching
fractions to \(t\bar t\), \(VH\), leptons, dijets, or invisible/exotic modes.
The distinction between \(V'\to VV\) and \(V'\to VV+VH\) is load-bearing for
CR012. A model with a large \(VH\) branching fraction can use the combined CMS
\(4.8~\mathrm{TeV}\) number; a diboson-only reinterpretation should instead use
the \(W'\to WZ\), \(Z'\to WW\), or \(V'\to VV\) rows and their corresponding
assumptions.
Code coverage in this repo
NO. Greps over
quarkConstraints/, qcd/,
flavorConstraints/, neutrinos/, yukawa/,
warpConfig/, solvers/, scanParams/, and
tests/ found no diboson, HVT, ATLAS/CMS search, HEPData likelihood, or
reinterpretation-tool implementation. The only adjacent matches are KK-scale
bookkeeping and low-energy flavor machinery: quarkConstraints/scan.py:359
maps \(\Lambda_{\rm IR}\) to \(M_{KK}\), quarkConstraints/scan.py:377
calls \(\Delta F=2\) constraints, quarkConstraints/deltaf2.py:320
documents tree-level KK-gluon-inspired \(\Delta F=2\) Wilsons, and
scanParams/scan.py:523 starts the unrelated \(\mu\to e\gamma\) LFV
filter. The only ``CMS'' grep hit is tests/test\_alpha\_s.py:89, a
RunDec QCD-running example, not a collider search.Implementation difficulty
HIGH. A faithful implementation needs either collaboration likelihood
material or an external reinterpretation chain such as CheckMATE, MadAnalysis5,
or SModelS, plus an RS spectrum/branching-ratio calculation. A single scalar
mass threshold would be misleading because the limit changes with width,
production mode, \(VV/VH\) branching fractions, and custodial embeddings.
Reason: A live CR012 constraint needs collider likelihoods or recast tools plus an RS spectrum, widths, production cross sections, and branching fractions; a scalar mass-threshold filter would not preserve the model assumptions behind the published limits.
Key references
PDG2025\_HeavyBosons\_Wprime\_WZ;
CMS2023\_B2G\_20\_009;
HEPData2022\_CMS\_B2G\_20\_009;
ATLAS2019\_Diboson139fb;
CMS2019\_B2G\_18\_002;
CMS2018\_Dijet\_B2G\_17\_001;
ATLAS2017\_Diboson36fb;
CMS2017\_BosonCombination;
ATLAS2015\_8TeVDiboson;
CMS2022\_Semileptonic\_B2G\_19\_002;
Pappadopulo2014\_HVT;
InternalQuarkScanMethodology\_RUNA\_47TeV.