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H.Lefevre, R.Leflat, A.Legotin, S.Leroy, O.Lesiak, T.Leverington, B.Li, H.Li, L.Li, P.Li, X.Li, Y.Li, Z.Liang, X.Lin, T.Lindner, R.Lisovskyi, VLitvinov, R.Liu, G.Liu, H.Liu, S.Liu, X.Loi, A.Lomba Castro, J.Longstaff, ILopes, J. H.Loustau, G.Lovell, G. H.Lu, Y.Lucchesi, D.Luchuk, S.Martinez, M. LucioLukashenko, VLuo, Y.Lupato, A.Luppi, E.Lupton, O.Lusiani, A.Lyu, X.Ma, L.Maccolini, S.Machefert, F.Maciuc, F.Macko, VMackowiak, P.Maddrell-Mander, S.Madejczyk, O.Mohan, L. R. MadhanMaev, O.Maevskiy, A.MaisuzenkoMajewski, M. W.Malczewski, J. J.Malde, S.Malecki, B.Malinin, A.Maltsev, T.Malygina, H.Manca, G.Mancinelli, G.Manera Escalero, R.Manuzzi, D.Marangotto, D.Maratas, J.Marchand, J. F.Marconi, U.Mariani, S.Benito, C. MarinMarinangeli, M.Marino, P.Marks, J.Marshall, P. J.Martellotti, G.Martinazzoli, L.Martinelli, M.Martinez Santos, D.Martinez Vidal, F.Massafferri, A.Materok, M.Matev, R.Mathad, A.Mathe, Z.Matiunin, VMatteuzzi, C.Mattioli, K. 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J.Ursov, E.Usachov, A.Ustyuzhanin, A.Uwer, U.Vagner, A.Vagnoni, V.Valassi, A.Valenti, G.Valls Canudas, N.van Beuzekom, M.Van Dijk, M.Van Hecke, H.van Herwijnen, E.Van Hulse, C. B.van Veghel, M.Vazquez Gomez, R.Vazquez Regueiro, P.Sierra, C. VazquezVecchi, S.Velthuis, J. J.Veltri, M.Venkateswaran, A.Veronesi, M.Vesterinen, M.Vieira, D.Diaz, M. VieitesViemann, H.Vilasis-Cardona, X.Figueras, E. VilellaVincent, P.Vitali, G.Vollhardt, A.Vom Bruch, D.Vorobyev, A.Vorobyev, V.Voropaev, N.Waldi, R.Walsh, J.Wang, C.Wang, J.Wang, M.Wang, R.Wang, Y.Wang, Z.Wark, H. M.Watson, N. K.Weber, S. G.Websdale, D.Weisser, C.Westhenry, B. D. C.White, D. J.Whitehead, M.Wiedner, D.Wilkinson, G.Wilkinson, M.Williams, IWilliams, M.Williams, M. R. J.Wilson, F. F.Wislicki, W.Witek, M.Witola, L.Wormser, G.Wotton, S. A.Wu, H.Wyllie, K.Xiang, Z.Xiao, D.Xie, Y.Xing, H.Xu, A.Xu, J.Xu, L.Xu, M.Xu, Q.Xu, Z.Yang, D.Yang, Y.Yang, Z.Yao, Y.Yeomans, L. E.Yin, H.Yu, J.Yuan, X.Yushchenko, O.Zaffaroni, E.Zarebski, K. A.Zavertyaev, M.Zdybal, M.Zenaiev, O.Zeng, M.Zhang, D.Zhang, L.Zhang, S.Zhang, Y.Zhelezov, A.Zheng, Y.Zhou, X.Zhou, Y.Zhu, X.Zhukov, VZonneveld, J. B.Zucchelli, S.Zuliani, D.Zunica, G.2021-05-082021-05-082021-05-082021-04-1010.1016/j.physletb.2021.136172https://infoscience.epfl.ch/handle/20.500.14299/177981WOS:000632729200049The Lambda(0)(b) -> Lambda+cK+K-pi(-) decay is observed for the first time using a data sample of proton-proton collisions at centre-of-mass energies of root s = 7 and 8 TeV collected by the LHCb detector, corresponding to an integrated luminosity of 3fb(-1). The ratio of branching fractions between the Lambda(0)(b) -> Lambda K-+(c)+ K-pi(-) and the Lambda(0)(b) -> Lambda D-+(c)s(-) decays is measured to beB(Lambda(0)(b) -> Lambda+cK+K-pi(-))/B(Lambda(0)(b) -> Lambda D-+(c)s(-)) = (9.26 +/- 0.29 +/- 0.46 +/- 0.26) x 10(-2),where the first uncertainty is statistical, the second systematic and the third is due to the knowledge of the D-s(-) -> K+K-pi(-) branching fraction. No structure on the invariant mass distribution of the Lambda K-+(c)+ system is found, consistent with no open-charm pentaquark signature. (c) 2021 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/).Astronomy & AstrophysicsPhysics, NuclearPhysics, Particles & FieldsPhysicstext::journal::journal article::research article