Measurement of τ polarization in W→τν decays with the ATLAS detector in pp collisions at √s = 7 TeV
- Aad, G.
- et al., [Unknown]
- Bentvelsen, S.
- Berglund, E.
- Bobbink, G.J.
- Bos, K.
- Boterenbrood, H.
- Colijn, A.P.
- de Jong, P.
- de Nooij, L.
- Deviveiros, P.O.
- Doxiadis, A.D.
- Ferrari, P.
- Garitaonandia, H.
- Geerts, D.A.A.
- Gosselink, M.
- Hartjes, F.
- Hessey, N.P.
- Igonkina, O.
- Kayl, M.S.
- Klous, S.
- Kluit, P.
- Koffeman, E.
- Lee, H.
- Lenz, T.
- Linde, F.
- Luijckx, G.
- Massaro, G.
- Mechnich, J.
- Mussche, I.
- Ottersbach, J.P.
- Reichold, A.
- Rijpstra, M.
- Ruckstuhl, N.
- Ta, D.
- Tsiakiris, M.
- Turlay, E.
- van der Graaf, H.
- van der Kraaij, E.
- van der Leeuw, R.
- van der Poel, E.
- van Kesteren, Z.
- van Vulpen, I.
- Verkerke, W.
- Vermeulen, J.C.
- Vranjes Milosavljevic, M.
- Vreeswijk, M.
Publication date
January 2012
DOIAbstract
In this paper, a measurement of τ polarization in W→τν decays is presented. It is measured from the energies of the decay products in hadronic τ decays with a single final state charged particle. The data, corresponding to an integrated luminosity of 24 pb−1, were collected by the ATLAS experiment at the Large Hadron Collider in 2010. The measured value of the τ polarization is Pτ=−1.06 ± 0.04 (stat)+0.05−0.07 (syst) , in agreement with the Standard Model prediction, and is consistent with a physically allowed 95 % CL interval [−1,−0.91]. Measurements of τ polarization have not previously been made at hadron colliders
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