395 research outputs found

    Open data from the first and second observing runs of Advanced LIGO and Advanced Virgo

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    Advanced LIGO and Advanced Virgo are monitoring the sky and collecting gravitational-wave strain data with sufficient sensitivity to detect signals routinely. In this paper we describe the data recorded by these instruments during their first and second observing runs. The main data products are gravitational-wave strain time series sampled at 16384 Hz. The datasets that include this strain measurement can be freely accessed through the Gravitational Wave Open Science Center at http://gw-openscience.org, together with data-quality information essential for the analysis of LIGO and Virgo data, documentation, tutorials, and supporting software

    First evidence for off-shell production of the Higgs boson and measurement of its width

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    The first evidence for off-shell Higgs production is reported in the final state with two Z bosons decaying into either four charged leptons (muons or electrons), or two charged leptons and two neutrinos, and a measurement of the Higgs boson width is performed. Results are based on data from the CMS experiment at the LHC at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of up to 140 fb‚ąí1^{-1}. The total rate of off-shell Higgs boson production beyond the Z boson pair production threshold, relative to its standard model expectation, is constrained to the interval [0.0061, 2.0] at 95% confidence level. The scenario with no off-shell production is excluded at 99.97% confidence level (3.6 standard deviations). The width of the Higgs boson is extracted as őďH\Gamma_{\mathrm{H}} = 3.2‚ąí1.7+2.4_{-1.7}^{+2.4} MeV, in agreement with the standard model expectation of 4.1 MeV. The data are also used to set new constraints on anomalous Higgs boson couplings to W and Z boson pairs