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FeynCalc / feyncalc

Mathematica package for algebraic calculations in elementary particle physics.
https://feyncalc.github.io
GNU General Public License v3.0
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Equation of Motion #5

Closed mescia closed 8 years ago

mescia commented 8 years ago

The instruction DiracSimplify[ Spinor[p1, m1].(DiracSlash[p2]).DiracMatrix[7].Spinor[p2, m2]] produces the following worng result -(m2_Spinor[Momentum[p1], m1, 1] . Spinor[Momentum[p2], m2, 1])/2 - m2_Spinor[Momentum[p1], m1, 1] . DiracGamma[5] . Spinor[Momentum[p2], m2, 1] 1/2 is missing. FeynCal v8.2 produces the right result. I am using mathemetica 9, linux or windows. thanks.

vsht commented 8 years ago

Thanks for the bug report. The issue was a wrong definition of DiracGamma[6] and DiracGamma[7] in Anti5. Since I usually prefer to write out the chiral projectors explicitly as 1/2 +- 1/2 GA[5], this bug somehow never occured to me.

It is now fixed also in the stable branch, just rerun the automatic installer and overwrite the existing installation.