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

By R. Aaij, C. Abellan Beteta, B. Adeva, M. Adinolfi, C. Aidala, Z. Ajaltouni, S. Akar, P. Albicocco, J. Albrecht, Federico Alessio and 489 more. Journal of High Energy Physics, 2018

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A bstractAn 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˜ρK*0$$ {\tilde{f}}_{\rho {K}^{*}}^0 $$ = 0.164 ± 0.015 ± 0.022 and f˜ωK*0$$ {\tilde{f}}_{\omega {K}^{*}}^0 $$ = 0.68 ± 0.17 ± 0.16, and their CP asymmetries, AρK*0$$ {\mathcal{A}}_{\rho {K}^{*}}^0 $$ = −0.62 ± 0.09 ± 0.09 and AωK*0$$ {\mathcal{A}}_{\omega {K}^{*}}^0 $$ = −0.13 ± 0.27 ± 0.13, where the first uncertainty is statistical and the second systematic.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/62496222373d36e7e250e2db72d9389ba4cea5f3