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

R$_{2}$ ($\langle{}E{}^{2}_{l}−\bar E{}^{2}_{l}\rangle{}_{E_{l}>1.5 GeV}$)

INSPIRE   JSON  (beta) PDGID:
S049EL2
VALUE ($ 10^{-3} $ GeV${}^{2}$) DOCUMENT ID TECN  COMMENT
$\bf{ 30.8 \pm0.8}$ OUR AVERAGE
$30.3$ $\pm0.9$ $\pm0.5$ 1
AUBERT,B
2004A
 BABR ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
$31.6$ $\pm0.8$ $\pm1.0$ 2
MAHMOOD
2004
CLEO ${{\mathit e}^{+}}$ ${{\mathit e}^{-}}$ $\rightarrow$ ${{\mathit \Upsilon}{(4S)}}$
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.
References