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E.Straticiuc, M.Straumann, U.Strokov, S.Sun, J.Sun, L.Swientek, K.Syropoulos, V.Szumlak, T.Szymanski, M.T'Jampens, S.Tang, Z.Tayduganov, A.Tekampe, T.Tellarini, G.Teubert, F.Thomas, E.van Tilburg, J.Tilley, M. J.Tisserand, V.Tobin, M.Tolk, S.Tomassetti, L.Tonelli, D.Tou, D. Y.Jadallah Aoude, R. TourinhoTournefier, E.Traill, M.Tran, M. T.Trisovic, A.Tsaregorodtsev, A.Tully, A.Tuning, N.Ukleja, A.Usachov, A.Ustyuzhanin, A.Uwer, U.Vacca, C.Vagner, A.Vagnoni, V.Valassi, A.Valat, S.Valenti, G.Vazquez Gomez, R.Vazquez Regueiro, P.Vecchi, S.van Veghel, M.Velthuis, J. J.Veltri, M.Veneziano, G.Venkateswaran, A.Verlage, T. A.Vernet, M.Vesterinen, M.Barbosa, J. V. VianaVieira, D.Vieites Diaz, M.Viemann, H.Vilasis-Cardona, X.Vitkovskiy, A.Vitti, M.Volkov, V.Vollhardt, A.Voneki, B.Vorobyev, A.Vorobyev, V.Voss, C.de Vries, J. A.Sierra, C. VazquezWaldi, R.Walsh, J.Wang, J.Wang, M.Wang, Y.Wang, Z.Ward, D. R.Wark, H. M.Watson, N. K.Websdale, D.Weiden, A.Weisser, C.Whitehead, M.Wicht, J.Wilkinson, G.Wilkinson, M.Williams, M. R. J.Williams, M.Williams, T.Wilson, F. F.Wimberley, J.Winn, M.Wishahi, J.Wislicki, W.Witek, M.Wormser, G.Wotton, S. A.Wyllie, K.Xiao, D.Xie, Y.Xu, A.Xu, M.Xu, Q.Xu, Z.Yang, Z.Yao, Y.Yin, H.Yu, J.Yuan, X.Yushchenko, O.Zarebski, K. A.Zavertyaev, M.Zhang, D.Zhang, L.Zhang, W. C.Zhang, Y.Zhelezov, A.Zheng, Y.Zhu, X.Zhukov, V.Zonneveld, J. B.Zucchelli, S.2018-12-132018-12-132018-12-132018-10-3110.1103/PhysRevD.98.072006https://infoscience.epfl.ch/handle/20.500.14299/152825WOS:000448924100001The first observation of the B-s(0) -> (D) over bar K-0 (+) K- decay is reported, together with the most precise branching fraction measurement of the mode B-0 -> (D) over bar K-0 (+) K- The results are obtained from an analysis of pp collision data corresponding to an integrated luminosity of 3.0 fb(-1). The data were collected with the LHCb detector at center-of-mass energies of 7 and 8 TeV, The branching fraction of the B-0 -> (D) over bar K-0 (+) K- decay is measured relative to that of the decay B-0 -> (D) over bar (0)pi (+) pi(-) to be B(B-0 -> (D) over bar K-0 (+) K-)/B(B-0 -> (D) over bar (0)pi (+) pi(-)) =(69 +/- 0.4 +/- 0.3)%, where the first uncertainty is statistical and the second is systematic. The measured branching fraction of the B-s(0) -> (D) over bar K-0 (+) K- decay mode relative to that of the corresponding B-0 decay is B(B-0 -> (D) over bar K-0 (+) K-)/B(B-0 -> (D) over bar K-0 (+) K-) = (93.0 +/- 809 +/- 6.9)%. Using the known branching fraction of B-0 -> (D) over bar (0)pi (+) pi(-), the values of B-0 -> (D) over bar K-0 (+) K- = (6.1 +/- 0.4 +/- 0.3 +/- 0.3) x 10(-5) and B(B-s(0) -> (D) over bar K-0 (+) K- = (5.7 +/- 0.5 +/- 0.4 +/- 0.5) x 10(-5) are obtained, where the third uncertainties arise from the branching fraction of the decay modes B-0 -> (D) over bar (0)pi (+) pi(-) and B-0 -> (D) over bar K-0 (+) K-, respectively.Astronomy & AstrophysicsPhysics, Particles & FieldsAstronomy & AstrophysicsPhysicsgammatooltext::journal::journal article::research article