Hi Xing,
this is expected, because setting $LimitTo4 = False is used to prevent
the reduction.
With the default value of $LimitTo4 you get fully correct reduction for B1
SetOptions[B0, BReduce -> True]
B1[pp, m1^2, m2^2] // Simplify
-((-A0[m1^2] + A0[m2^2] + (m1^2 - m2^2 + pp) B0[pp, m1^2, m2^2])/(
2 pp))
which agrees with the literature (Eq. B.6 in arXiv:hep-ph/0212259v2)
Likewise for B11
SetOptions[B0, BReduce -> True]
B11[pp, m1^2, m2^2] // Simplify
Cheers,
Vladyslav
Am 23.09.2015 um 22:06 schrieb Xing:
> Hi Vladyslav,
> It seems that B1 and B11 don't reduce once I set $LimitTo4 = False.
>
> Best,
> Xing
>
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