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?	\(p_1\)		\(p_2\)		\(p_3\)	\(p_4\)	\(p_5\)	\(p_6\)
`m2enn0`	1	\(\mu^+\)	\(\to\)	\(e^+\)
`m2ennF`	1
`m2ennFFz`	1
`m2ennFF`	1
`m2ennLL`	1
`m2ennNF`	1
`m2ej0`	1	\(\mu^+\)	\(\to\)	\(e^+\)		\(j\)
`m2ejF`	1	\(\mu^+\)	\(\to\)	\(e^+\)		\(j\)
`m2ejg0`	1	\(\mu^+\)	\(\to\)	\(e^+\)		\(j\)	\(\gamma\)
`m2enng0`	1	\(\mu^+\)	\(\to\)	\(e^+\)		\(\gamma\)
`m2enngF`	1
`m2enngV`	1
`m2enngC`	1
`m2ennee0`	1	\(\mu^+\)	\(\to\)	\(e^+\)		\(e^-\)	\(e^+\)
`m2enneeV`	1
`m2enneeA`	1
`m2enneeC`	1
`t2mnnee0`	1	\(\tau^+\)	\(\to\)	\(\mu^+\)		\(e^-\)	\(e^+\)
`t2mnneeV`	1
`t2mnneeA`	1
`t2mnneeC`	1
`em2em0`		\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)
`em2emV`
`em2emC`
`em2emREM`		\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)	\(\gamma\)
`em2emREM15`
`em2emREM35`
`em2emREMco`
`em2emFFEEEE`		\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)
`em2emFFEEEEz`
`em2emFFMMMM`
`em2emFFMIXDz`
`em2emFF31z`
`em2emFF22z`
`em2emFF13z`
`em2emFFz`
`em2emRFMIXD`		\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)	\(\gamma\)
`em2emRFMIXD15`
`em2emRF3115`
`em2emRF2215`
`em2emRF1315`
`em2emRFMIXD35`
`em2emRF3135`
`em2emRF2235`
`em2emRF1335`
`em2emRFMIXDco`
`em2emRRMIXD`		\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)	\(\gamma\)	\(\gamma\)
`em2emRRMIXD1516`
`em2emRR311516`
`em2emRR221516`
`em2emRR131516`
`em2emRRMIXD3536`
`em2emRR313536`
`em2emRR223536`
`em2emRR133536`
`em2emRRMIXDc`
`emZem0X`		\(e^-\)		\(\mu^+\)	\(\to\)	\(e^-\)	\(\mu^+\)
`em2emA`		\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)
`em2emAA`		\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)
`em2emAREM`		\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)	\(\gamma\)
`em2emNFEEHYP`		\(e^-\)		\(\mu^-\)	\(\to\)	\(e^-\)	\(\mu^-\)
`em2emNFMMHYP`
`em2emNFEMHYP`
`em2emNFHYP`
`em2emNFEEDISP`
`em2emNFMMDISP`
`em2emNFEMDISP`
`em2emNFDISP`
`em2emNFEMCT`
`mp2mp0`		\(\mu^-\)		\(p\)	\(\to\)	\(\mu^-\)	\(p\)
`mp2mp0nuc`
`mp2mpFMP`
`mp2mpRMP`		\(\mu^-\)		\(p\)	\(\to\)	\(\mu^-\)	\(p\)	\(y\)
`mp2mpRMP15`
`mp2mpRMP35`
`mp2mpRMPco`
`mp2mpFF`		\(\mu^-\)		\(p\)	\(\to\)	\(\mu^-\)	\(p\)
`mp2mpA`
`mp2mpAA`
`mp2mpNF`
`ms2ms0`		\(\mu^-\)		\(12c\)	\(\to\)	\(\mu^-\)	\(12c\)
`ms2msFF`		\(\mu^-\)		\(s\)	\(\to\)	\(\mu^-\)	\(s\)
`ms2msA`
`ms2msAA`
`ee2tt0`	4	\(e^-\)		\(e^+\)	\(\to\)	\(\tau^-\)	\(\tau^+\)
`ee2ttA`		\(e^-\)		\(e^+\)	\(\to\)	\(\tau^-\)	\(\tau^+\)
`ee2mm0`	2	\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)
`eeZmm0`	2
`eeZmm0X`	2
`ee2mmFEE`
`ee2mmFEM`
`ee2mmFMM`
`ee2mmREM`		\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)	\(\gamma\)
`ee2mmFFz`		\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)
`ee2mmFFEEEE`
`ee2mmFFMIXDz`
`ee2mmFFMMMM`
`ee2mmRFMIXD`		\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)	\(\gamma\)
`ee2mmRF31`
`ee2mmRF22`
`ee2mmRF13`
`ee2mmRRMIXD`		\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)	\(\gamma\)	\(\gamma\)
`ee2mmRR31`
`ee2mmRR22`
`ee2mmRR13`
`ee2mmA`		\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)
`eeZmmAX`
`ee2mmAA`	2
`ee2mmAREM`		\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)	\(\gamma\)
`ee2mmNFEEHYP`	2	\(e^-\)		\(e^+\)	\(\to\)	\(\mu^-\)	\(\mu^+\)
`ee2mmNFMMHYP`
`ee2mmNFEEDISP`
`ee2mmNFEMDISP`
`ee2mmNFMMDISP`
`ee2mmNFDISP`
`ee2uu0`		\(e^-\)		\(e^+\)	\(\to\)	\(pi^-\)	\(pi^+\)
`ee2uuFFEEEE`
`ee2uuNFEE`
`ee2uuFEU1`
`ee2uuFEU2`
`ee2nn0`		\(e^+\)		\(e^-\)	\(\to\)	\(\nu\)	\(\nu\)
`ee2nnF`
`ee2nnS`
`ee2nnSS`
`ee2nnCC`
`ee2nnRF`		\(e^+\)		\(e^-\)	\(\to\)	\(\nu\)	\(\nu\)	\(\gamma\)
`ee2ggFF`		\(e^-\)		\(e^+\)	\(\to\)	\(\gamma\)	\(\gamma\)
`ee2ggNFHYP`
`ee2ggNFDISP`
`ee2ggLBL0`
`ee2ggRLBL`		\(e^-\)		\(e^+\)	\(\to\)	\(\gamma\)	\(\gamma\)	\(\gamma\)
`eg2eg0`		\(e^-\)		\(\gamma\)	\(\to\)	\(e^-\)	\(\gamma\)
`eg2egNFDISP`		\(e^-\)		\(\gamma\)	\(\to\)	\(e^-\)	\(\gamma\)
`ee2ee0`		\(e^-\)		\(e^-\)	\(\to\)	\(e^-\)	\(e^-\)
`ee2eeA`
`ee2eeFF`
`ee2eeFFdz`
`ee2eeAA`
`ee2eeNFHYP`
`ee2eeNFTRHYP`
`ee2eeNFBXHYP`
`ee2eeNFDISP`
`ee2eeNFTRDISP`
`ee2eeNFBXDISP`