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What does the CMS measurement of W-polarization tell us about the underlying theory of the coupling of W-bosons to matter?

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Abstract

We discuss results of the CMS collaboration on the sensitivity of the LHC to W boson polarisation in the process pp → W ± + jet → e ±jet+ using the L P variable directly connected to θ ∗ angle of the outgoing lepton in the rest frame of the decaying W. We have shown that for a given L P , interference between different polarizations of the W- boson is not negligible, and needs to be taken into account when considering the differential cross-section with respect to L P . The L P variable suggested by CMS collaboration is highly suitable variable to study LHC sensitivity to g V , g A couplings of W -boson to fermions. We note that the experimental sensitivity to W-boson polarization which is much higher than that to (g V , g A ) parameter space can be turned around and used to identify deviations from the Standard Model as a signal for new physics at the LHC.

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Authors and Affiliations

  1. School of Physics & Astronomy, University of Southampton, Highfield, Southampton, SO17 1BJ, U.K.

    Alexander Belyaev & Douglas Ross

  2. Particle Physics Department, Rutherford Appleton Laboratory, Chilton, Didcot, Oxon, OX11 0QX, U.K.

    Alexander Belyaev

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  1. Alexander Belyaev
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  2. Douglas Ross
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Correspondence to Alexander Belyaev.

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Belyaev, A., Ross, D. What does the CMS measurement of W-polarization tell us about the underlying theory of the coupling of W-bosons to matter?. J. High Energ. Phys. 2013, 120 (2013). https://doi.org/10.1007/JHEP08(2013)120

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  • DOI: https://doi.org/10.1007/JHEP08(2013)120

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