Study of the B0 → ρ(770)°K*(892)0 decay with an amplitude analysis of B0 → (π+π−)(K+π−) decays

Robert Appleby, Silvia Borghi, Christopher Burr, Stefano De Capua, Deepanwita Dutta, Evelina Gersabeck, Marco Gersabeck, Lucia Grillo, Martha Hilton, George Lafferty, Andrew Mcnab, Christopher Parkes, Gediminas Sarpis, Mark Williams, The LHCb Collaboration

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    Abstract

    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, ωf0(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∗f~ρK∗0 = 0.164 ± 0.015 ± 0.022 and f~0ωK∗f~ωK∗0 = 0.68 ± 0.17 ± 0.16, and their CP asymmetries, A0ρK∗AρK∗0 = −0.62 ± 0.09 ± 0.09 and A0ωK∗AωK∗0 = −0.13 ± 0.27 ± 0.13, where the first uncertainty is statistical and the second systematic.

    Original languageEnglish
    JournalThe Journal of High Energy Physics
    Volume2019
    Issue number26
    Early online date6 May 2019
    DOIs
    Publication statusPublished - May 2019

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