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P.Souza De Paula, B.Spaan, B.Spradlin, P.Sridharan, S.Stagni, F.Stahl, M.Stahl, S.Stefko, P.Stefkova, S.Steinkamp, O.Stemmle, S.Stenyakin, O.Stepanova, M.Stevens, H.Stone, S.Storaci, B.Stracka, S.Stramaglia, M. E.Straticiuc, M.Straumann, U.Sun, J.Sun, L.Swientek, K.Syropoulos, V.Szumlak, T.Szymanski, M.Tang, Z.Tayduganov, A.Tekampe, T.Tellarini, G.Teubert, F.Thomas, E.Tilley, M. J.Tisserand, V.T'Jampens, S.Tobin, M.Tolk, S.Tomassetti, L.Tonelli, D.Tourinho Jadallah Aoude, R.Tournefier, E.Traill, M.Tran, M. T.Tresch, M.Trisovic, A.Tsaregorodtsev, A.Tsopelas, P.Tully, A.Tuning, N.Ukleja, A.Usachov, A.Ustyuzhanin, A.Uwer, U.Vacca, C.Vagner, A.Vagnoni, V.Valassi, A.Valat, S.Valenti, G.van Beuzekom, M.van Herwijnen, E.van Tilburg, J.van Veghel, M.Vazquez Gomez, R.Vazquez Regueiro, P.Sierra, C. VazquezVecchi, S.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.Vitti, M.Volkov, V.Vollhardt, A.Voneki, B.Vorobyev, A.Vorobyev, V.Voropaev, N.Voss, C.Waldi, R.Walsh, J.Wang, J.Wang, M.Wang, Y.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.Williams, M. R. J.Williams, T.Wilson, F. F.Wimberley, J.Winn, M.Wishahi, J.Wislicki, W.Witek, M.Wormser, G.Wotton, S. A.Wyllie, K.Xie, Y.Xu, M.Xu, Q.Xu, Z.Yang, Z.Yao, Y.Yin, H.Yu, J.Yuan, X.Yushchenko, O.Zarebski, K. A.Zavertyaev, M.Zhang, L.Zhang, Y.Zhelezov, A.Zheng, Y.Zhu, X.Zhukov, V.Zonneveld, J. B.Zucchelli, S.2019-06-182019-06-182019-06-182019-03-2710.1007/JHEP03(2019)176https://infoscience.epfl.ch/handle/20.500.14299/158150WOS:000462976200003The branching fractions of the doubly Cabibbo-suppressed decays D+ ! K, D+ ! and D+ s ! are measured using the decays D+ ! K and D+ s ! K as normalisation channels. The measurements are performed using proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of 8TeV, corresponding to an integrated luminosity of 2.0 fb. The results are B (D+ ! K) B (D+ ! K) = (6 : 541 0 : 025 0 : 042) 10 B (D+ ! ) B (D+ ! K) = (5 : 231 0 : 009 0 : 023) 10 B (D+ s ! ) B (D+ s ! K) = (2 : 372 0 : 024 0 : 025) 10 where the uncertainties are statistical and systematic, respectively. These are the most precise measurements up to date.Physics, Particles & FieldsPhysicsbranching fractioncharm physicsflavor physicshadron-hadron scattering (experiments)tooltext::journal::journal article::research article