Measurement of the forward-backward asymmetry in $Z/\gamma^{\ast} \rightarrow \mu^{+}\mu^{-}$ decays and determination of the effective weak mixing angle
- Aaij, R.
- Amhis, Y.
- Barsuk, S.
- Borsato, M.
- Kochebina, O.
- Lefrançois, J.
- Li, Y.
- Machefert, F.
- Manca, G.
- Quagliani, R.
- Robbe, P.
- Schune, M-H.
- Teklishyn, M.
- Vallier, A.
- Viaud, B.
- Wormser, G.
- Beaucourt, L.
- Chefdeville, M.
- Decamp, D.
- Déléage, N.
- Ghez, P.
- Lees, J.P.
- Marchand, J.F.
- Minard, M.N.
- Pietrzyk, B.
- Qian, W.
- t'Jampens, S.
- Tisserand, V.
- Tournefier, E.
- Ajaltouni, Z.J.
- Baalouch, M.
- Cogneras, E.
- Deschamps, O.
- Rifai, I. El
- Gazzoni, G.
- Grabalosa Gándara, M.
- Henrard, Pierre
- Hoballah, M.
- Kozeiha, M.
- Lefèvre, R.
- Maratas, J.
- Monteil, S.
- Niess, V.
- Perret, P.
- Akar, S.
- Aslanides, E.
- Cogan, J.
- Bruyn, K. De
- Kanso, W.
- Legac, R.
- Leroy, O.
- Mancinelli, G.
- Martin, M.
- Mordà, A.
- Serrano, J.
- Tayduganov, A.
- Tsaregorodtsev, A.
DOIAbstract
See paper for full list of authors.International audienceThe forward-backward charge asymmetry for the process $q\bar{q} \rightarrow Z/\gamma^{\ast} \rightarrow \mu^{+}\mu^{-}$ is measured as a function of the invariant mass of the dimuon system. Measurements are performed using proton proton collision data collected with the LHCb detector at $\sqrt{s} = 7$ and 8\tev, corresponding to integrated luminosities of $1$fb$^{-1}$ and $2$fb$^{-1}$ respectively. Within the Standard Model the results constrain the effective electroweak mixing angle to be $$sin^{2}\theta_{W}^{eff} = 0.23142 \pm 0.00073 \pm 0.00052 \pm 0.00056 $$ where the first uncertainty is statistical, the second systematic and the third theoretical. This result is in agreement wi...
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