基本的にはMG5_aMC_v2_6_0以下のディレクトリで作成したファイルの中に入っているCardsというディレクトリの中に入っているdatファイルをいじれば良い。例えば限定的な領域での散乱断面積を見るためには、mYやmXの範囲(scan:[])をいじる。
以下では、DMsimp_s_spin1 model（FeynRulesの利用を参照)を使用したp p > xd xd~ jというプロセスを計算するとき、mediatorとダークマターの質量を変えて計算した例を紹介する。
$ cd MG5_aMC_v2_6_0 $ ./bin/mg5_aMC MG5_aMC>import model DMsimp_s_spin1 MG5_aMC>generate p p > xd xd~ j MG5_aMC>output MG5_aMC>launch
何か出たら一回[Enter key]を押すと
Do you want to edit a card (press enter to bypass editing)?
/------------------------------------------------------------\
| 1. param : param_card.dat |
| 2. run : run_card.dat |
| 3. madanalysis5_parton : madanalysis5_parton_card.dat |
\------------------------------------------------------------/
you can also
- enter the path to a valid card or banner.
- use the 'set' command to modify a parameter directly.
The set option works only for param_card and run_card.
Type 'help set' for more information on this command.
- call an external program (ASperGE/MadWidth/...).
Type 'help' for the list of available command
[0, done, 1, param, 2, run, 3, madanalysis5_parton, enter path][90s to answer]
>とでるので[1]を押すとparam_card.datが開くので日本語が書いてある部分を編集する。
GNU nano 2.0.9 File: /data/asai/IntensiveCourses/MG5_aMC_v2_6_0/PROC_DMsimp_s_spin1_1/Cards/param_card.dat
######################################################################
## PARAM_CARD AUTOMATICALY GENERATED BY MG5 FOLLOWING UFO MODEL ####
######################################################################
## ##
## Width set on Auto will be computed following the information ##
## present in the decay.py files of the model. ##
## See arXiv:1402.1178 for more details. ##
## ##
######################################################################
###################################
## INFORMATION FOR CKMBLOCK
###################################
Block ckmblock
1 2.277360e-01 # cabi
###################################
## INFORMATION FOR DMINPUTS
###################################
Block dminputs
1 0.000000e+00 # gVXc
2 1.000000e+00 # gVXd
3 0.000000e+00 # gAXd
4 2.500000e-01 # gVd11
5 2.500000e-01 # gVu11
6 2.500000e-01 # gVd22
7 2.500000e-01 # gVu22
8 2.500000e-01 # gVd33
9 2.500000e-01 # gVu33
10 0.000000e+00 # gVl11
11 0.000000e+00 # gVl22
12 0.000000e+00 # gVl33
13 0.000000e+00 # gAd11
14 0.000000e+00 # gAu11
15 0.000000e+00 # gAd22
16 0.000000e+00 # gAu22
17 0.000000e+00 # gAd33
18 0.000000e+00 # gAu33
19 0.000000e+00 # gAl11
20 0.000000e+00 # gAl22
21 0.000000e+00 # gAl33
22 0.000000e+00 # gnu11
23 0.000000e+00 # gnu22
24 0.000000e+00 # gnu33
25 0.000000e+00 # gVu31
26 0.000000e+00 # gAu31
27 0.000000e+00 # gVd31
28 0.000000e+00 # gAd31
29 0.000000e+00 # gVh
###################################
## INFORMATION FOR LOOP
###################################
Block loop
1 9.118800e+01 # MU_R
###################################
## INFORMATION FOR MASS
###################################
Block mass
6 1.720000e+02 # MT
15 1.777000e+00 # MTA
23 9.118760e+01 # MZ
25 1.250000e+02 # MH
5000001 scan:[200+200*i for i in range(0,10)] #1.000000e+03 # MY1 #200-2000[GeV]までscan
5000511 1.000000e+01 # MXr
5000512 1.000000e+01 # MXc
5000521 scan:[10+10*i for i in range(0,10)] #1.000000e+01 # MXd #10-100[GeV]までscan
## Dependent parameters, given by model restrictions.
## Those values should be edited following the
## analytical expression. MG5 ignores those values
## but they are important for interfacing the output of MG5
## to external program such as Pythia.
1 0.000000 # d : 0.0
2 0.000000 # u : 0.0
3 0.000000 # s : 0.0
4 0.000000 # c : 0.0
5 0.000000 # b : 0.0
11 0.000000 # e- : 0.0
12 0.000000 # ve : 0.0
13 0.000000 # mu- : 0.0
14 0.000000 # vm : 0.0
16 0.000000 # vt : 0.0
21 0.000000 # g : 0.0
22 0.000000 # a : 0.0
24 79.824360 # w+ : cmath.sqrt(MZ__exp__2/2. + cmath.sqrt(MZ__exp__4/4. - (aEW*cmath.pi*MZ__exp__2)/(Gf*sqrt__2)))
9000002 91.187600 # ghz : MZ
9000003 79.824360 # ghwp : MW
9000004 79.824360 # ghwm : MW
###################################
## INFORMATION FOR SMINPUTS
###################################
Block sminputs
1 1.279000e+02 # aEWM1
2 1.166370e-05 # Gf
3 1.184000e-01 # aS
###################################
## INFORMATION FOR YUKAWA
###################################
Block yukawa
6 1.720000e+02 # ymt
15 1.777000e+00 # ymtau
###################################
## INFORMATION FOR DECAY
###################################
DECAY 6 1.508336e+00 # WT
DECAY 23 2.495200e+00 # WZ
DECAY 24 2.085000e+00 # WW
DECAY 25 4.070000e-03 # WH
DECAY 5000001 auto #1.000000e+01 # WY1 #widthの補正項を自動にするとより厳密に崩壊を再現できるらしい（？）
## Dependent parameters, given by model restrictions.
## Those values should be edited following the
## analytical expression. MG5 ignores those values
## but they are important for interfacing the output of MG5
## to external program such as Pythia.
DECAY 1 0.000000 # d : 0.0
DECAY 2 0.000000 # u : 0.0
DECAY 3 0.000000 # s : 0.0
DECAY 4 0.000000 # c : 0.0
DECAY 5 0.000000 # b : 0.0
DECAY 11 0.000000 # e- : 0.0
DECAY 12 0.000000 # ve : 0.0
DECAY 13 0.000000 # mu- : 0.0
DECAY 14 0.000000 # vm : 0.0
DECAY 15 0.000000 # ta- : 0.0
DECAY 16 0.000000 # vt : 0.0
DECAY 21 0.000000 # g : 0.0
DECAY 22 0.000000 # a : 0.0
DECAY 5000511 0.000000 # xr : 0.0
DECAY 5000512 0.000000 # xc : 0.0
DECAY 5000521 0.000000 # xd : 0.0
DECAY 9000002 2.495200 # ghz : WZ
DECAY 9000003 2.085000 # ghwp : WW
DECAY 9000004 2.085000 # ghwm : WW
#===========================================================
# QUANTUM NUMBERS OF NEW STATE(S) (NON SM PDG CODE)
#===========================================================
Block QNUMBERS 5000511 # xr
1 0 # 3 times electric charge
2 1 # number of spin states (2S+1)
3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
4 0 # Particle/Antiparticle distinction (0=own anti)
Block QNUMBERS 5000512 # xc
1 0 # 3 times electric charge
2 1 # number of spin states (2S+1)
3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
4 1 # Particle/Antiparticle distinction (0=own anti)
Block QNUMBERS 5000521 # xd
1 0 # 3 times electric charge
2 2 # number of spin states (2S+1)
3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
4 1 # Particle/Antiparticle distinction (0=own anti)
Block QNUMBERS 5000001 # y1
1 0 # 3 times electric charge
2 3 # number of spin states (2S+1)
3 1 # colour rep (1: singlet, 3: triplet, 8: octet)
4 0 # Particle/Antiparticle distinction (0=own anti)編集し終わったら[Ctrl+x]、[Y]、[Enter key]で終了。また[Enter key]を押すとプログラムが実行される。