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|a Measurement of the W boson helicity fractions in the decays of top quark pairs to lepton + jets final states produced in pp collisions at √ s = 8 TeV
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|b Elsevier BV,
|c 2021-10-27T20:04:22Z.
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|z Get fulltext
|u https://hdl.handle.net/1721.1/134298
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|a © 2016 The Author The W boson helicity fractions from top quark decays in tt‾ events are measured using data from proton-proton collisions at a centre-of-mass energy of 8TeV. The data were collected in 2012 with the CMS detector at the LHC, corresponding to an integrated luminosity of 19.8fb−1. Events are reconstructed with either one muon or one electron, along with four jets in the final state, with two of the jets being identified as originating from b quarks. The measured helicity fractions from both channels are combined, yielding F0=0.681±0.012(stat)±0.023(syst), FL=0.323±0.008(stat)±0.014(syst), and FR=−0.004±0.005(stat)±0.014(syst) for the longitudinal, left-, and right-handed components of the helicity, respectively. These measurements of the W boson helicity fractions are the most accurate to date and they agree with the predictions from the standard model.
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|a Article
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|t 10.1016/J.PHYSLETB.2016.10.007
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|t Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
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