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

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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 8TeV corresponding to an integrated luminosity of 19.7 fb(-1). 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.

Autore Pugliese

Tutti gli autori

  • POMPILI A.;CALABRIA C.;CAPUTO C.;MINIELLO G.;CRISTELLA L.;ABBRESCIA M.;DE PALMA M.;RADOGNA R.;VENDITTI R.;MY S.;NUZZO S.V.

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Anno di pubblicazione

2016

ISSN

1029-8479

ISBN

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Numero di citazioni Wos

10

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Numero di citazioni Scopus

17

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