Systematic uncertainties

Source	Contribution to
	$c\tau(B^-)$ ($\mu$m)	$c\tau(\bar{B}^0)$ ($\mu$m)	$\tau(B^-)/\tau(\bar{B}^0)$
Prompt charm background
prompt charm fraction ($f_c$)	$^{+3.7}_{-1.9}$	$^{+5.7}_{-3.7}$	$^{+0.006}_{-0.007}$
prompt charm shape (${\cal F}_c$)	$\pm2.6$	$\pm5.2$	$\pm0.007$
Bottom background
Bottom background fraction ($f_b$)	$^{+0.3}_{-0.9}$	$^{+0.7}_{-1.5}$	$^{+0.001}_{-0.002}$
Bottom background shape (${\cal F}_b$)	$\pm2.6$	$\pm1.4$	$\pm0.002$
Sample composition
$D^{**}$ fraction ($f^{**}$)	$^{+2.5}_{-0.6}$	$^{+6.5}_{-10.1}$	$^{+0.032}_{-0.018}$
$D^{**}$ composition ($P_V$)	$^{+0.7}_{-1.4}$	$^{+11.0}_{-8.6}$	$^{+0.023}_{-0.031}$
$\pi_s^+$ reconstruction	$^{+0.1}_{-0.6}$	$^{+0.8}_{-0.0}$	$^{+0.000}_{-0.004}$
Missing momentum correction
$p_T(B)$ spectrum	$\pm6.1$	$\pm5.3$	-
$B$ decay model	$\pm1.0$	$\pm1.3$	-
Electron cuts	$\pm2.0$	$\pm1.4$	-
Signal fraction ( $f_{\mbox{\small sig}}$)	$\pm2.4$	$\pm0.9$	$\pm0.003$
Resolution scale factor	$\pm3.6$	$\pm1.9$	$\pm0.003$
Decay length cut	$^{+0.0}_{-1.8}$	$^{+0.0}_{-2.2}$	$^{+0.001}_{-0.000}$
Combinatorial background shape	$\pm0.7$	$\pm0.1$	$\pm0.002$
Detector alignment	$\pm2.0$	$\pm2.0$	-
Total	$^{+10.0}_{-9.4}$	$^{+16.3}_{-16.3}$	$^{+0.041}_{-0.039}$