${{\mathit B}}$ $\rightarrow$ ${{\mathit X}_{{{c}}}}{{\mathit \ell}}{{\mathit \nu}}$ LEPTON MOMENTUM MOMENTS

R$_{1}$ ($\langle{}E_{l}\rangle{}_{E_{l}>1.5 GeV}$)

INSPIRE   JSON  (beta) PDGID:
S049AEL
VALUE DOCUMENT ID TECN  COMMENT
$\bf{ 1.7797 \pm0.0018}$ OUR AVERAGE  Error includes scale factor of 1.8.  See the ideogram below.
$1.7743$ $\pm0.0019$ $\pm0.0014$ 1
AUBERT,B
2004A
 BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$1.7792$ $\pm0.0021$ $\pm0.0027$ 2
MAHMOOD
2004
CLEO ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$1.7810$ $\pm0.0007$ $\pm0.0009$ 3
MAHMOOD
2003
CLE2 ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
1  The leptons are required to have E$_{l}$ $>$ 1.5 GeV in the B rest frame. The result with E$_{l}$ $>$ 0.6 GeV is also given.
2  Uses E$_{e}$ $>$ 1.5 GeV and also reports moments with other minimum minimum E$_{e}$ conditions, as low as E$_{e}$ $>$ 0.6 GeV.
3  The leptons are required to have E$_{l}>$1.5 GeV in the B rest frame.

           R$_{1}$ ($\langle{}E_{l}\rangle{}_{E_{l}>1.5 GeV}$)
References