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oai:recercat.cat:2445/1622972025-12-05T16:48:19Zcom_2072_1057col_2072_478823col_2072_478904col_2072_478917

00925njm 22002777a 4500 dc LHCb Collaboration author Alfonso Albero, Alejandro author Calvo Gómez, Míriam author Camboni, Alessandro author Coquereau, Samuel author Garrido Beltrán, Lluís author Gascón Fora, David author Gironella Gironell, Pere author Graciani Díaz, Ricardo author Graugés Pous, Eugeni author Vilasis-Cardona, Xavier author Marin Benito, Carla author 2020-05-25T13:23:07Z 2020-05-25T13:23:07Z 2019-05-06 2020-05-25T13:23:07Z An amplitude analysis of B0 → (π+π−)(K+π−) decays is performed in the two-body invariant mass regions 300 < m(π+π−) < 1100 MeV/c2, accounting for the ρ0, ω, f0(500), f0(980) and f0(1370) resonances, and 750 < m(K+π−) < 1200 MeV/c2, which is dominated by the K*(892)0 meson. The analysis uses 3 fb−1 of proton-proton collision data collected by the LHCb experiment at centre-of-mass energies of 7 and 8 TeV. The CP averages and asymmetries are measured for the magnitudes and phase differences of the con- tributing amplitudes. The CP-averaged longitudinal polarisation fractions of the vector-vector modes are found to be f~0ρK∗ = 0.164 ± 0.015 ± 0.022 and f~0ωK∗ = 0.68 ± 0.17 ± 0.16, and their CP asymmetries, A0ρK∗ = −0.62 ± 0.09 ± 0.09 and A0ωK∗ = −0.13 ± 0.27 ± 0.13, where the first uncertainty is statistical and the second systematic. Hadrons Polarització (Física nuclear) Física de partícules Experiments Hadrons Polarization (Nuclear physics) Particle physics Experiments Study of the B 0 → ρ(770)°K * (892) 0 decay with an amplitude analysis of B 0 → (π + π − )(K + π − ) decays