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arXiv · 2306.12635

The $b$ quark fragmentation fractions at LHCb and meson decays with heavy quark spectators

C. O. Dib·C. S. Kim·N. A. Neill
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Abstract

We study the current estimates of $B_c\to B_s \pi$ to extract the fragmentation fraction $f_c/f_s$ at the LHCb. A rather robust estimate of $Br(B_c\to B_s \pi)$ based on factorization and lattice results for the form factor gives $f_c/f_s \sim 0.056$ with a $16\%$ error. We also revisit the extraction of $f_s/f_d$ using $B\to D\pi$ instead of the theoretical cleaner but more suppressed channel $B\to DK$. We also find a tension on the predictions of $Br(B_c\to J/\psi \pi)$ and $Br(B_c\to B_s\pi)$ considering the measurements of these modes at LHCb, and find that, within a $23\%$ uncertainty, only the lower end of the current prediction range $Br(B_c\to J/\psi)\sim 0.4\% - 1.7\%$ would be consistent with the LHCb measurements.

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C. O. Dib, C. S. Kim, N. A. Neill. 2023-06-22. The $b$ quark fragmentation fractions at LHCb and meson decays with heavy quark spectators. https://doi.org/10.1140/epjc%2Fs10052-023-11974-1

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