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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 8 TeV 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.
Fuente: Journal of High Energy Physics, Vol. 2016, Num. 4, Art. Num. 73
Editorial: Springer Verlag
Fecha de publicación: 01/04/2016
Nº de páginas: 42
Tipo de publicación: Artículo de Revista
DOI: 10.1007/JHEP04(2016)073
ISSN: 1126-6708,1029-8479
Url de la publicación: https://doi.org/10.1007/JHEP04(2016)073
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