FeynCalc manual (development version)

FCLoopAddMissingHigherOrdersWarning

FCLoopAddMissingHigherOrdersWarning[expr, ep, fun] determines the highest ep-power $n$ in the given expression and adds a warning flag of order $\textrm{ep}^n+1$. This is meant to prevent incorrect results stemming insufficient high expansions of expr in ep

See also

Overview, FCFeynmanParametrize, FCFeynmanPrepare.

Examples

FCLoopAddMissingHigherOrdersWarning[1/ep^2 cc1 + 1/ep cc2, ep, epHelp]

$$\frac{\text{cc1}}{\text{ep}^2}+\frac{\text{cc2}}{\text{ep}}+(1+i) \;\text{epHelp}$$

FCLoopAddMissingHigherOrdersWarning[cc1, ep, epHelp]

$$\text{cc1}+(1+i) \;\text{ep} \;\text{epHelp}$$

FCLoopAddMissingHigherOrdersWarning[cc1, ep, epHelp, Complex -> False]

$$\text{cc1}+\text{ep} \;\text{epHelp}$$

FCLoopAddMissingHigherOrdersWarning[cc1, ep, epHelp, Names -> False]

$$\text{cc1}+(1+i) \;\text{ep} \;\text{epHelp}$$

FCLoopAddMissingHigherOrdersWarning[GLI[topo1, {1, 1, 1, 1, 1}] -> cc1/ep^2 + cc2/ep + cc3 , ep, epHelp]

$$G^{\text{topo1}}(1,1,1,1,1)\to \frac{\text{cc1}}{\text{ep}^2}+\frac{\text{cc2}}{\text{ep}}+\text{cc3}+(1+i) \;\text{ep} \;\text{epHelp}(\text{topo1X11111})$$