Search for W$\gamma$ resonances in proton-proton collisions at $\sqrt{s} =$ 13 TeV using hadronic decays of Lorentz-boosted W bosons
(2022) Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics — Vol. 826 (2022)
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- A search for <math altimg="si2.svg"><mi mathvariant="normal">W</mi><mi mathvariant="normal">γ</mi></math> 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 <math altimg="si1.svg"><msqrt><mrow><mi>s</mi></mrow></msqrt><mo linebreak="goodbreak" linebreakstyle="after">=</mo><mn>13</mn></math> TeV, corresponding to an integrated luminosity of 137 fb<sup loc="post">−1</sup>, collected with the CMS detector at the LHC in 2016–2018. The <math altimg="si2.svg"><mi mathvariant="normal">W</mi><mi mathvariant="normal">γ</mi></math> 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 <math altimg="si2.svg"><mi mathvariant="normal">W</mi><mi mathvariant="normal">γ</mi></math> 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 over a large range of probed masses. In specific heavy scalar (vector) triplet benchmark models, narrow 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 <math altimg="si2.svg"><mi mathvariant="normal">W</mi><mi mathvariant="normal">γ</mi></math> channel are set for minimum <math altimg="si2.svg"><mi mathvariant="normal">W</mi><mi mathvariant="normal">γ</mi></math> mass thresholds between 1.5 and 8.0 TeV.
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Bethani, A., Bruno, G., Bury, F., Caputo, C., David, P., Delaere, C., Donertas, I. S., Giammanco, A., Lemaitre, V., Mondal, K., Prisciandaro, J., Taliercio, A., Teklishyn, M., Vischia, P., Wertz, S., Wuyckens, S., CMS, & et al. (2022). Search for W$\gamma$ resonances in proton-proton collisions at $\sqrt{s} =$ 13 TeV using hadronic decays of Lorentz-boosted W bosons. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 826. https://doi.org/10.1016/j.physletb.2022.136888 (Original work published 2022)