Hi there, upon realizing that Christian's denominator below is (q1-q2)^2*q2^2, and that q10+q21=(q1^2+q1\cdot q2)/q10, it is actually easy to verify that his result and Do Hoang Son's agree, upon further setting rho=0 in the numerator in Christian's result. So normal should see that in this limit, after a bit massage? Herzliche Gruesse aus Harvard, Dirk Christian Bauer wrote:
Hi!
On Wed, 20 Oct 1999, Do Hoang Son wrote:
coeff(series(OneLoop3Pt(3,0,0,q10,q20,q21,m1,m2,m3),eps,3),eps,-1); !!!
This result if be simplified by simplify() of Maple gives -1/4*I*Pi(q10+q20) as expected
Hm... I get
3 2 3 2 2 3 2 2 - 1/12 (3 I q10 q20 - 3 I q10 q21 - 3 I q10 q20 + 3 I q10 q21 q20
4 2 4 5 2 3 - 3 I q10 q20 + 2 q10 rho q21 + 3 I q10 q21 + 3 I q20 - 6 I q21 q20
2 4 2 / - 4 q20 rho q21 + 3 I q20 q21 ) Pi / ( /
2 2 2 2 2 (-2 q20 q10 - q21 + q10 + q20 ) (-q21 + q20 ))
!?
Bye, Christian
-- / Coding on PowerPC and proud of it \/ http://www.uni-mainz.de/~bauec002/