- #1
Safinaz
- 258
- 8
Hi all,
I'd like to ask about " the vacuum saturation approximation " in a calculation as the decay width of ##
B \to l \nu ## [hep-ph/0306037v2] equ. 1 till equ. 4, that why
## < 0 | \bar{u} \gamma_\mu b | B > ~ and ~ < 0 | \bar{u} b | B > = 0 ## ? and for ##
[ \bar{l} \gamma^\mu (1-\gamma_5) \nu ] ## why didn't say:
## < l^- \bar{ \nu} | \bar{l} \gamma^\mu (1-\gamma_5) \nu | 0 >## ?
Bests.
I'd like to ask about " the vacuum saturation approximation " in a calculation as the decay width of ##
B \to l \nu ## [hep-ph/0306037v2] equ. 1 till equ. 4, that why
## < 0 | \bar{u} \gamma_\mu b | B > ~ and ~ < 0 | \bar{u} b | B > = 0 ## ? and for ##
[ \bar{l} \gamma^\mu (1-\gamma_5) \nu ] ## why didn't say:
## < l^- \bar{ \nu} | \bar{l} \gamma^\mu (1-\gamma_5) \nu | 0 >## ?
Bests.