Title: Search for Wγ resonances in proton-proton collisions at √s=13 TeV using hadronic decays of Lorentz-boosted W bosons

Journal Article · · Physics Letters. B
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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 TeV, corresponding to an integrated luminosity of 137 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.

Research Organization:
Fermi National Accelerator Laboratory (FNAL), Batavia, IL (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Contributing Organization:
The CMS Collaboration
Grant/Contract Number:
AC02-07CH11359
OSTI ID:
1831875
Report Number(s):
CERN-EP-2021-102; CMS-EXO-20-001; FERMILAB-PUB-21-413-CMS; arXiv:2106.10509; oai:inspirehep.net:1869502
Journal Information:
Physics Letters. B, Journal Name: Physics Letters. B Vol. 826; ISSN 0370-2693
Publisher:
ElsevierCopyright Statement
Country of Publication:
United States
Language:
English

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