An experimentalist’s guide to the semileptonic bottom to charm branching fractions

Abstract

This work summarizes the current status of the measured semileptonic branching fractions B 0,+ → X c µν. The sum of exclusive measurements is compared with the inclusive determination, accounting for isospin extrapolation. Further derived quantities are computed, taking into account different explanations for the unmeasured components of the total branching fraction. These quantities focus on the charge breakdown of the final states, and are designed for use as inputs or comparisons in future experimental measurements.Licensed under CC-BY-NC-SA-4.0.

Measurement of b hadron fractions in 13 TeV pp collisions

“…The χ 2 =ndof is 0.63, in agreement with a flat spectrum. The measurement is consistent with the prediction and places some constraints on the D ÃÃ content of semileptonic B decays [11].…”

“…The H c decay modes used and their branching fractions are given in Table II. The ratio of D þ to D 0 meson production in the sum of semileptonicB 0 and B − decays, f þ =f 0 , is used to check the analysis method. This result can be related to models of the hadronic final states in B − andB 0 semileptonic decays [11].…”

“…Assuming f u equals f d , Ref. [11] estimates the fraction of D þ μ with respect to D 0 μ modes in the sum of B − andB 0 decays as 0.387 AE 0.012 AE 0.026. The first uncertainty comes from the uncertainties on known measurements.…”