Particle ID

The following table lists the which_pieces of McMule as well as the corresponding PID. For example, when calculating the process \(\mu^+\to e^+\nu\bar\nu e^+e^-\), the measurement function may receive up to seven arguments that can be mapped to particles as follows:

FUNCTION QUANT(Q1,Q2,Q3,Q4,Q5,Q6,Q7)
real(kind=prec) :: q1(4) ! incoming muon+
real(kind=prec) :: q2(4) ! outgoing electron+
real(kind=prec) :: q3(4) ! outgoing neutrino, averaged over
real(kind=prec) :: q4(4) ! outgoing neutrino, averaged over
real(kind=prec) :: q5(4) ! outgoing electron-
real(kind=prec) :: q6(4) ! outgoing electron+
real(kind=prec) :: q7(4) ! outgoing optional photon

pol1 = (/ 0., 0., -0.85, 0. /) ! set incoming muon polarisation
...
END FUNCTION

Additionally to the particle mapping, we see that neutrinos are averaged over as indicated by \(\big[\bar\nu_\mu\nu_e\big]\). We can further tell that the first initial state particle is polarised since the P-column lists a 1.

`which_piece`	P?	\(p_1\)		\(p_2\)		\(p_3\)	\(p_4\)	\(p_5\)	\(p_6\)	\(p_7\)
`m2enn0`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(\big[\bar{\nu}_e\nu_\mu\big]\)
`m2ennF`	1
`m2ennFF`	1
`m2ennNF`	1
`m2ennR`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(\big[\bar{\nu}_e\nu_\mu\big]\)		\(\gamma\)
`m2ennRF`	1
`m2enng0`	1
`m2enngV`	1
`m2enngC`	1
`m2ennRR`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(\big[\bar{\nu}_e\nu_\mu\big]\)		\(\gamma\)	\(\gamma\)
`m2enngR`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(\big[\bar{\nu}_e\nu_\mu\big]\)		\(\gamma\)	\(\gamma\)
`m2ennee0`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(\big[\bar{\nu}_e\nu_\tau\big]\)		\(e^+\)	\(e^-\)
`m2enneeV`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(\big[\bar{\nu}_e\nu_\tau\big]\)		\(e^+\)	\(e^-\)
`m2enneeC`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(\big[\bar{\nu}_\mu\nu_e\big]\)		\(e^+\)	\(e^-\)
`m2enneeA`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(\big[\bar{\nu}_e\nu_\tau\big]\)		\(e^+\)	\(e^-\)
`m2enneeR`	1	\(\mu^+\)	\(\to\)	\(e^+\)		\(\big[\nu_\mu\bar{\nu}_e\big]\)		\(e^-\)	\(e^+\)	\(\gamma\)
`t2mnnee0`	1	\(\tau^-\)	\(\to\)	\(\mu^-\)		\(\big[\bar{\nu}_e\nu_\tau\big]\)		\(e^+\)	\(e^-\)
`t2mnneeV`	1	\(\tau^-\)	\(\to\)	\(\mu^-\)		\(\big[\bar{\nu}_e\nu_\tau\big]\)		\(e^+\)	\(e^-\)
`t2mnneeC`	1	\(\tau^-\)	\(\to\)	\(\mu^-\)		\(\big[\bar{\nu}_\tau\nu_\mu\big]\)		\(e^+\)	\(e^-\)
`t2mnneeA`	1	\(\tau^-\)	\(\to\)	\(\mu^-\)		\(\big[\bar{\nu}_e\nu_\tau\big]\)		\(e^+\)	\(e^-\)
`t2mnneeR`	1	\(\tau^+\)	\(\to\)	\(\mu^+\)		\(\big[\nu_\tau\bar{\nu}_e\big]\)		\(e^-\)	\(e^+\)	\(\gamma\)
`m2ej0`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(j\)
`m2ejF`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(j\)
`m2ejR`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(j\)	\(\gamma\)
`m2ejg0`	1	\(\mu^-\)	\(\to\)	\(e^-\)		\(j\)	\(\gamma\)
`em2em0`	0	\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)
`em2emV`	0
`em2emC`	0
`em2emFEE`	0
`em2emFEM`	0
`em2emFMM`	0
`em2emA`	0
`em2emFFEEEE`	0
`em2emFFMMMM`	0
`em2emFFMIXDz`	0
`em2emAA`	0
`em2emAFEE`	0
`em2emAFEM`	0
`em2emAFMM`	0
`em2emNFEE`	0
`em2emNFEM`	0
`em2emNFMM`	0
`em2emREE`	0	\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)	\(\gamma\)
`em2emREM`	0
`em2emRMM`	0
`em2emRFEEEE`	0
`em2emRFMIXD`	0
`em2emRFMMMM`	0
`em2emAREE`	0
`em2emAREM`	0
`em2emARMM`	0
`em2emRREEEE`	0	\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)	\(\gamma\)	\(\gamma\)
`em2emRRMIXD`	0
`em2emRRMMMM`	0
`emZem0X`	0	\(e^-\)		\(\mu^+\)	\(\to\)	\(e^-\)	\(\mu^+\)
`emZemFX`	0
`emZemRX`	0
`mp2mp0`	0	\(\mu^-\)		\(p\)	\(\to\)	\(\mu^-\)	\(p\)
`mp2mpF`	0
`mp2mpA`	0
`mp2mpFF`	0
`mp2mpAA`	0
`mp2mpAF`	0
`mp2mpNF`	0
`mp2mpR`	0	\(\mu^-\)		\(p\)	\(\to\)	\(\mu^-\)	\(p\)	\(\gamma\)
`mp2mpRF`	0
`mp2mpAR`	0
`mp2mpRR`	0	\(\mu^-\)		\(p\)	\(\to\)	\(\mu^-\)	\(p\)	\(\gamma\)	\(\gamma\)
`ee2mm0`	2	\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)
`ee2mmF`	0
`ee2mmFFEEEE`	0
`ee2mmR`	0	\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)	\(\gamma\)
`ee2mmRFEEEE`	0	\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)	\(\gamma\)
`ee2mmRREEEE`	0	\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)	\(\gamma\)	\(\gamma\)
`ee2mmA`	0	\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)
`ee2mmAA`	2
`ee2mmNFEE`	2
`ee2mmAFEE`	0
`ee2mmAREE`	0	\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)	\(\gamma\)
`eeZmm0`	2	\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)
`eeZmm0X`	2
`eeZmmFX`	0
`eeZmmAX`	0
`eeZmmRX`	0	\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)	\(\gamma\)
`ee2ee0`	0	\(e^-\)		\(e^-\)	\(\to\)	\(e^-\)	\(e^-\)
`ee2eeA`	0
`ee2eeF`	0
`ee2eeFF`	0
`ee2eeAA`	0
`ee2eeAF`	0
`ee2eeNF`	0
`ee2eeR`	0	\(e^-\)		\(e^-\)	\(\to\)	\(e^-\)	\(e^-\)	\(\gamma\)
`ee2eeRF`	0
`ee2eeAR`	0
`ee2eeRR`	0	\(e^-\)		\(e^-\)	\(\to\)	\(e^-\)	\(e^-\)	\(\gamma\)	\(\gamma\)
`eb2eb0`	0	\(e^-\)		\(e^+\)	\(\to\)	\(e^-\)	\(e^+\)
`eb2ebF`	0
`eb2ebFF`	0
`eb2ebR`	0	\(e^-\)		\(e^+\)	\(\to\)	\(e^-\)	\(e^+\)	\(\gamma\)
`eb2ebRF`	0	\(e^-\)		\(e^+\)	\(\to\)	\(e^-\)	\(e^+\)	\(\gamma\)
`eb2ebRR`	0	\(e^-\)		\(e^+\)	\(\to\)	\(e^-\)	\(e^+\)	\(\gamma\)	\(\gamma\)
`ee2nn0`	0	\(e^-\)		\(e^+\)	\(\to\)	\(\nu\)	\(\nu\)
`ee2nnF`	0
`ee2nnS`	0
`ee2nnSS`	0
`ee2nnCC`	0
`ee2nnR`	0	\(e^-\)		\(e^+\)	\(\to\)	\(\nu\)	\(\nu\)	\(\gamma\)
`ee2nnRF`	0	\(e^-\)		\(e^+\)	\(\to\)	\(\nu\)	\(\nu\)	\(\gamma\)