Search for a standard model-like higgs boson in the mass range between 70 and 110 GeV in the diphoton final state in proton-proton collisions at root s=8 and 13 TeV
The results of a search for a standard model-like Higgs boson in the mass range between 70 and 110 GeV decaying into two photons are presented. The analysis uses the data set collected with the CMS experiment in proton-proton collisions during the 2012 and 2016 LHC running periods. The data sampl...
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| 總結: | The results of a search for a standard model-like Higgs boson in the mass range between 70 and
110 GeV decaying into two photons are presented. The analysis uses the data set collected with the
CMS experiment in proton-proton collisions during the 2012 and 2016 LHC running periods. The data
sample corresponds to an integrated luminosity of 19.7 (35.9)fb−1 at √s = 8 (13) TeV. The expected and
observed 95% confidence level upper limits on the product of the cross section and branching fraction
into two photons are presented. The observed upper limit for the 2012 (2016) data set ranges from
129 (161) fb to 31 (26) fb. The statistical combination of the results from the analyses of the two data
sets in the common mass range between 80 and 110 GeV yields an upper limit on the product of the
cross section and branching fraction, normalized to that for a standard model-like Higgs boson, ranging
from 0.7 to 0.2, with two notable exceptions: one in the region around the Z boson peak, where the
limit rises to 1.1, which may be due to the presence of Drell–Yan dielectron production where electrons
could be misidentified as isolated photons, and a second due to an observed excess with respect to the
standard model prediction, which is maximal for a mass hypothesis of 95.3 GeV with a local (global)
significance of 2.8 (1.3) standard deviations. |
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