5 research outputs found

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

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    A search for Wγ 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 s=13 TeV, corresponding to an integrated luminosity of 137 fb−1, collected with the CMS detector at the LHC in 2016–2018. The Wγ 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 Wγ 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 Wγ channel are set for minimum Wγ mass thresholds between 1.5 and 8.0 TeV

    NESTOR: a status report

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    NESTOR is an underwater neutrino astrophysics laboratory to be located in the international waters of the southwest of Greece. The first phase of this experiment is the construction and deployment of one hexagonal tower consisting of 168 optical modules, with effective area of 20000m(2) for E greater than or equal to TeV neutrinos. Over the past few years detailed studies of the site have been carried out while many tests have been performed. The current status of the preparation of the experiment and the future plans will be presented

    A measurement of the photonuclear interactions of 180 GeV muons in iron

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    The energy spectrum and the cross section of photonuclear interactions of 180 GeV muons in iron were measured at the CERN SPS using prototype modules of the ATLAS hadron calorimeter. The differential cross section (N-A/A)nudsigma/dnu for a union fractional energy loss nu = E-mu/E-mu was measured in the range 0.1 < nu < 1. The integrated cross section (N-A/A) integral(0.1)(1) nudsigma/dnu is (0.26 +/- 0.03(stat) +/- 0.03(syst)) . 10(-6) cm(2) g(-1) in agreement with the theoretical prediction of 0.267 . 10(-6) cm(2)g(-1). The best adjustment of the data to the theory is achieved for the value of sigma(gamma)N = (115 +/- 18(stat) +/- 15(syst))mub of the photon-nucleon cross section for photons with energies in the range from 18 to 180 GeV

    First flavor-tagged determination of bounds on mixing-induced CP violation in B-s(0)-> J/psi phi decays

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