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K.Websdale, D.Weiden, A.Weisser, C.Whitehead, M.Wilkinson, G.Wilkinson, M.Williams, I.Williams, M.Williams, M. R. J.Williams, T.Wilson, F. F.Winn, M.Wislicki, W.Witek, M.Wormser, G.Wotton, S. A.Wyllie, K.Xiao, D.Xie, Y.Xing, H.Xu, A.Xu, M.Xu, Q.Xu, Z.Yang, Z.Yao, Y.Yeomans, L. E.Yin, H.Yu, J.Yuan, X.Yushchenko, O.Zarebski, K. A.Zavertyaev, M.Zeng, M.Zhang, D.Zhang, L.Zhang, W. C.Zhang, Y.Zhelezov, A.Zheng, Y.Zhu, X.Zhukov, V.Zonneveld, J. B.Zucchelli, S.2019-07-312019-07-312019-07-312019-07-0510.1007/JHEP07(2019)032https://infoscience.epfl.ch/handle/20.500.14299/159472WOS:000475572300001The B0 K0K0 and B0 s K0K0 decays are studied using proton-proton collision data corresponding to an integrated luminosity of 3 fb. An untagged and timeintegrated amplitude analysis of B0 (s) (K+)(K) decays in two-body invariant mass regions of 150MeV/c2 around the K0 mass is performed. A stronger longitudinal polarisation fraction in the B0 K0K0 decay, fL = 0 : 724 0 : 051 (stat) 0 : 016 (syst), is observed as compared to fL = 0 : 240 0 : 031 (stat) 0 : 025 (syst) in the B0 s K0K0 decay. The ratio of branching fractions of the two decays is measured and used to determine B (B0 K0K0) = (8 : 0 0 : 9 (stat) 0 : 4 (syst)) x 10(-7).Physics, Particles & FieldsPhysicsb physicshadron-hadron scattering (experiments)polarizationtooltext::journal::journal article::research article