New measurements of B⁺_c decays into single charm final states

2026/08/04 by LHCb collaboration, R. Aaij, A. S. W. Abdelmotteleb +1132
Physics and Astronomy · #hep-ex

paper · pdf

All figures and tables, along with any supplementary material and additional information, are available at https://lhcb-glance.cern.ch/alcm/public/analysis/full-details/1627

arxiv created 2026/08/04 · arxiv updated 2026/08/05

Abstract

Using proton-proton collision data corresponding to an integrated luminosity of 9 \textrmfb^-1 collected by the LHCb experiment, searches are performed for B⁺_c mesons decaying to a charm and a charmless meson pair. Five products of branching fraction, \cal B(B⁺_c → DX), and fragmentation ratio f_c/f_u are reported, R_{D⁺ K^*0} = ( 1.42 ± 0.23 ± 0.07 ± 0.11 ) × 10^-6,
R_{D^*0 K⁺} = (1.46 ± 0.30 ± 0.11 ± 0.05 ) × 10^-6,
R_{D⁺s ϕ} = ( 4.0± 1.3 ± 0.2 ± 0.5) × 10^-7 ,
R_{D⁰ K⁺} = ( 9.7 ± 1.0 ± 0.4 ± 0.3 ) × 10^-7,
R_{D⁰ π⁺} < 1.4 × 10^-7 at 95% CL. In each case, the first uncertainty is statistical, the second is systematic and the third includes external uncertainties. The first result is a first observation, the second and third exhibit clear evidence and the fourth improves the precision of previous measurements by a factor two. Additionally, the CP asymmetry in B⁺_c → D⁰ K⁺ decays is measured and found to be compatible with zero.

Citations

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