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E.Straticiuc, M.Straumann, U.Strokov, S.Sun, J.Sun, L.Sun, Y.Swientek, K.Szabelski, A.Szumlak, T.Szymanski, M.T'Jampens, S.Tang, Z.Tekampe, T.Tellarini, G.Teubert, F.Thomas, E.van Tilburg, J.Tilley, M. J.Tisserand, VTobin, M.Tolk, S.Tomassetti, L.Tonelli, D.Tou, D. Y.Jadallah Aoude, R. TourinhoTournefier, E.Traill, M.Tran, M. T.Trisovic, A.Tsaregorodtsev, A.Tuci, G.Tully, A.Tuning, N.Ukleja, A.Usachov, A.Ustyuzhanin, A.Uwer, U.Vagner, A.Vagnoni, V.Valassi, A.Valat, S.Valenti, G.Van Hecke, H.Van Hulse, C. B.Vasiliev, A.Gomez, R. VazquezVazquez Regueiro, P.Vecchi, S.van Veghel, M.Velthuis, J. J.Veltri, M.Venkateswaran, A.Vernet, M.Veronesi, M.Vesterinen, M.Barbosa, J. V. VianaVieira, D.Vieites Diaz, M.Viemann, H.Vilasis-Cardona, X.Vitkovskiy, A.Vitti, M.Volkov, V.Vollhardt, A.Vom Bruch, D.Voneki, B.Vorobyev, A.Vorobyev, V.Voropaev, N.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.Wilkinson, G.Wilkinson, M.Williams, IWilliams, M. R. J.Williams, M.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, VZonneveld, J. B.Zucchelli, S.2019-07-022019-07-022019-07-022019-06-1110.1103/PhysRevLett.122.232001https://infoscience.epfl.ch/handle/20.500.14299/158743WOS:000471988300003Using pp collision data corresponding to an integrated luminosity of 8.5 fb(-1) recorded by the LHCb experiment at center-of-mass energies of root s = 7, 8, and 13 TeV, the observation of an excited B-c(+) state in the B-c(+)pi(+)pi(-) invariant-mass spectrum is reported. The observed peak has a mass of 6841.2 +/- 0.6(stat) +/- 0.1(syst) +/- 0.8(B-c(+)) MeV/c(2), where the last uncertainty is due to the limited knowledge of the B-c(+) mass. It is consistent with expectations of the B-c*(2(3)S(1))(+) state reconstructed without the low-energy photon from the B-c*(1(3)S(1))(+) -> B-c(+)gamma decay following B-c*(2(3)S(1))(+) -> B-c*(1(3)S(1))(+)pi(+)pi(-). A second state is seen with a global (local) statistical significance of 2.2 sigma (3.2 sigma) and a mass of 6872.1 +/- 1.3(stat) +/- 0.1(syst) +/- 0.8(B-c(+)) MeV/c(2), and is consistent with the B-c(2(1)S(0))(+) state. These mass measurements are the most precise to date.Physics, MultidisciplinaryPhysicsb-c spectroscopydecaymesonstext::journal::journal article::research article