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T.Tsaregorodtsev, A.Tuning, N.Garcia, M. UbedaUkleja, A.Urquijo, P.Uwer, U.Vagnoni, V.Valenti, G.Vazquez Gomez, R.Vazquez Regueiro, P.Vecchi, S.Velthuis, J. J.Veltri, M.Vervink, K.Viaud, B.Videau, I.Vilasis-Cardona, X.Visniakov, J.Vollhardt, A.Voong, D.Vorobyev, A.Voss, H.Wacker, K.Wandernoth, S.Wang, J.Ward, D. R.Webber, A. D.Websdale, D.Whitehead, M.Wiedner, D.Wiggers, L.Wilkinson, G.Williams, M. P.Williams, M.Wilson, F. F.Wishahi, J.Witek, M.Witzeling, W.Wotton, S. A.Wyllie, K.Xie, Y.Xing, F.Xing, Z.Yang, Z.Young, R.Yushchenko, O.Zavertyaev, M.Zhang, F.Zhang, L.Zhang, W. C.Zhang, Y.Zhelezov, A.Zhong, L.Zverev, E.Zvyagin, A.2012-05-042012-05-042012-05-04201210.1016/j.physletb.2012.02.001https://infoscience.epfl.ch/handle/20.500.14299/79987WOS:000302111200007The first observation of the decay B-s(0) -> K*(0)(K) over bar*(0) is reported using 35 pb(-1) of data collected by LHCb in proton-proton collisions at a centre-of-mass energy of 7 TeV. A total of 49.8 +/- 7.5 B-s(0) -> (K+pi(-))(K-pi(+)) events are observed within +/- 50 MeV/c(2) of the B-s(0) mass and 746 MeV/c(2) < m(K pi) < 1046 MeV/c(2), mostly coming from a resonant B-s(0) -> K*(0)(K) over bar*(0) signal. The branching fraction and the CP-averaged K*(0) longitudinal polarization fraction are measured to B(B-s(0) -> K*(0)(K) over bar*(0)) = (2.81 +/- 0.46(stat.) +/- 0.45(syst.) +/- 0.34(f(s)/f(d))) x 10(-5) and f(L) = 0.31 +/- 0.12(stat.) +/- 0.04(syst.). (C) 2012 CERN. Published by Elsevier B.V. All rights reserved.Branching FractionsAmplitudestext::journal::journal article::research article