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oai:recercat.cat:2445/1318342025-11-21T05:46:59Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc Camboni, Alessandro author Comerma Montells, Albert author Garrido Beltrán, Lluís author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author López Asamar, Elias author Picatoste Olloqui, Eduardo author Potterat, Cédric author Ruiz, Hugo (Ruiz Pérez) author Vázquez Gómez, Ricard author Abellan Beteta, Carlos author Calvo Gómez, Míriam author Vilasis-Cardona, Xavier author Domingo Bonal, Francesc author LHCb Collaboration author 2019-04-08T13:45:05Z 2019-04-08T13:45:05Z 2013-05-01 2019-04-08T13:45:05Z Using proton-proton collision data collected by the LHCb experiment at √ s = 7     TeV , corresponding to an integrated luminosity of 1.0     fb − 1 , the ratio of branching fractions of the B 0 → D * − π + π − π + decay relative to the B 0 → D * − π + decay is measured to be B ( B 0 → D * − π + π − π + ) B ( B 0 → D * − π + ) = 2.64 ± 0.04 ( stat ) ± 0.13 ( syst ) . The Cabibbo-suppressed decay B 0 → D * − K + π − π + is observed for the first time, and the measured ratio of branching fractions is B ( B 0 → D * − K + π − π + ) B ( B 0 → D * − π + π − π + ) = ( 6.47 ± 0.37 ( stat ) ± 0.35 ( syst ) ) × 10 − 2 . A search for orbital excitations of charm mesons contributing to the B 0 → D * − π + π − π + final state is also performed, and the first observation of the B 0 → ¯¯¯ D 1 ( 2420 ) 0 π + π − decay is reported with the ratio of branching fractions B ( B 0 → ( ¯¯¯ D 1 ( 2420 ) 0 → D * − π + ) π − π + ) B ( B 0 → D * − π + π − π + ) = ( 2.04 ± 0.42 ( stat ) ± 0.22 ( syst ) ) × 10 − 2 , where the numerator represents a product of the branching fractions B ( B 0 → ¯¯¯ D 1 ( 2420 ) 0 π − π + ) and B ( ¯¯¯ D 1 ( 2420 ) 0 → D * − π + ) . Física de partícules Experiments Particle physics Experiments Study of B0→D*-π+π-π+ and B0→D*-K+π-π+ decays