Measurement of the Average $\phi$ Multiplicity in $B$ Meson Decay

TL;DR

This paper reports a precise measurement of the average number of $$ mesons produced in $B$ meson decays, using data from the BaBar detector at the PEP-II collider.

Contribution

It provides the most accurate measurement to date of $$ meson multiplicity in $B$ decays, improving precision over previous results.

Findings

Measured $$ multiplicity in $B$ decays as (3.41 ± 0.06 ± 0.12)%

Used 17.6 fb^{-1} of data at the $$ resonance

Reconstructed $$ in the $K^+K^-$ decay mode

Abstract

We present a measurement of the average multiplicity of $\phi$ mesons in $B^0$, $\kern 0.18em\bar{\kern -0.18em B}{}^0$ and $B^\pm$ meson decays. Using $17.6 fb^{-1}$ of data taken at the $\Upsilon{(4S)}\xspace$ resonance by the {\slshape B\kern-0.1em{\smaller A}\kern-0.1em B\kern-0.1em{\smaller A\kern-0.2em R}} detector at the PEP-II $e^+e^-\xspace$ storage ring at the Stanford Linear Accelerator Center, we reconstruct $\phi$ mesons in the $K^+K^-$ decay mode and measure ${\cal{B}}(B\to \phi X) = (3.41\pm0.06\pm0.12)%$. This is significantly more precise than any previous measurement.