Search for W$\gamma$ resonances in proton-proton collisions at $\sqrt{s} =$ 13 TeV using hadronic decays of Lorentz-boosted W bosons

The CMS collaboration
Phys.Lett.B 826 (2022) 136888, 2022.

Abstract (data abstract)
A search for $W\gamma$ resonances in the mass range between 0.7 and 6.0 TeV is presented. The $W$ boson is reconstructed via its hadronic decays, with the final-state products forming a single large-radius jet, owing to a high Lorentz boost of the $W$ boson. The search is based on proton-proton collision data at $\sqrt{s} = 13 ~\text{TeV}$, corresponding to an integrated luminosity of 137 $\text{fb}^{-1}$, collected with the CMS detector at the LHC in 2016--2018. The $W\gamma$ mass spectrum is parameterized with a smoothly falling background function and examined for the presence of resonance-like signals. No significant excess above the predicted background is observed. Model-specific upper limits at 95% confidence level on the product of the cross section and branching fraction to the $W\gamma$ channel are set. Limits for narrow resonances and for resonances with an intrinsic width equal to 5% of their mass, for spin-0 and spin-1 hypotheses, range between 0.17 fb at 6.0 TeV and 55 fb at 0.7 TeV. These are the most restrictive limits to date on the existence of such resonances. In specific narrow-resonance benchmark models, heavy scalar (vector) triplet resonances with masses between 0.75 (1.15) and 1.40 (1.36) TeV are excluded for a range of model parameters. Model-independent limits on the product of the cross section, signal acceptance, and branching fraction to the $W\gamma$ channel are set for minimum $W\gamma$ mass thresholds between 1.5 and 8.0 TeV.

  • Signal acceptance

    Data from Figure 3(a)

    10.17182/hepdata.106162.v2/t1

    Fitted 4th order polynomials to the signal acceptance for narrow and broad, scalar and vector Wgamma resonances. This quantity is...

  • Product of the signal efficiency and acceptance

    Data from Figure 3(b)

    10.17182/hepdata.106162.v2/t2

    Fitted 4th order polynomials to the product of the signal efficiency and acceptance for narrow and broad, scalar and vector...

  • W tagging efficiency

    Data from Figure 3(c)

    10.17182/hepdata.106162.v2/t3

    W tagging efficiency, averaged for different spin and width hypotheses. The Standard deviation shown below is the standard deviation between...

  • Wgamma invariant mass spectra

    Data from Figure 4

    10.17182/hepdata.106162.v2/t4

    Observed and expected (background-only fitted) invariant mass spectra of Wgamma events. The fitted function is ${ d N}/{ d m}...

  • Cross section limits for a narrow scalar Wgamma resonance

    Data from Figure 5(a)

    10.17182/hepdata.106162.v2/t5

    Expected and observed 95% CL upper limits on the product of the cross section and branching fraction for narrow scalar...

  • Cross section limits for a broad scalar Wgamma resonance

    Data from Figure 5(b)

    10.17182/hepdata.106162.v2/t6

    Expected and observed 95% CL upper limits on the product of the cross section and branching fraction for broad scalar...

  • Cross section limits for a narrow vector Wgamma resonance

    Data from Figure 5(c)

    10.17182/hepdata.106162.v2/t7

    Expected and observed 95% CL upper limits on the product of the cross section and branching fraction for narrow vector...

  • Cross section limits for a broad vector Wgamma resonance

    Data from Figure 5(d)

    10.17182/hepdata.106162.v2/t8

    Expected and observed 95% CL upper limits on the product of the cross section and branching fraction for broad vector...

  • Model-independent limits for a general Wgamma resonance

    Data from Figure 7(a)

    10.17182/hepdata.106162.v2/t9

    Expected and observed model-independent 95% CL upper limits on the product of the cross section, branching fraction and signal acceptance...

  • Model-independent limits for a general Jgamma resonance

    Data from Figure 7(b)

    10.17182/hepdata.106162.v2/t10

    Expected and observed model-independent 95% CL upper limits on the product of the cross section, branching fraction, signal acceptance and...

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