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Measurement of top quark polarisation in t-channel single top quark production

The CMS collaboration
JHEP 1604 (2016) 073, 2016

Abstract (data abstract)
A first measurement of the top quark spin asymmetry, sensitive to the top quark polarisation, in t-channel single top quark production is presented. It is based on a sample of pp collisions at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 19.7 inverse-femtobarns. A high-purity sample of t-channel single top quark events with an isolated muon is selected. Signal and background components are estimated using a fit to data. A differential cross section measurement, corrected for detector effects, of an angular observable sensitive to the top quark polarisation is performed. The differential distribution is used to extract a top quark spin asymmetry of 0.26 +/- 0.03 (stat) +/- 0.10 (syst), which is compatible with a p-value of 4.6% with the standard model prediction of 0.44.

  • Table 1

    Data from Page 15 of preprint, figure 5 (left)

    10.17182/hepdata.38092.v1/t1

    The normalized differential cross section as a function of unfolded $\cos\theta_{\mu}^{*}$ for top quark.

  • Table 2

    Data from Page 15 of preprint, figure 5 (right)

    10.17182/hepdata.38092.v1/t2

    The normalized differential cross section as a function of unfolded $\cos\theta_{\mu}^{*}$ for top antiquark.

  • Table 3

    Data from Page 16 of preprint, figure 6

    10.17182/hepdata.38092.v1/t3

    The normalized differential cross section as a function of unfolded $\cos\theta_{\mu}^{*}$ for top quark and antiquark.

  • Table 4

    Data from Page 13 of preprint, equations 5-8

    10.17182/hepdata.38092.v1/t4

    The asymmetry $A_{\mu}$ extracted from the differential cross sections.

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