Changes between Version 1 and Version 2 of MadOniaManual
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- Mar 20, 2012, 4:29:57 PM (13 years ago)
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MadOniaManual
v1 v2 1 1 2 2 3 == Manual: section on [ :../../view/Software/MadOnia:MadOnia] ==3 == Manual: section on [wiki:MadOnia MadOnia] == 4 4 5 5 MadOnia is a module that is deeply integrated in MadGraph/MadEvent. It can be seen as a specific implemented Model. For this reason, the procedure that you need to follow to generate a new quarkonium production process and then quarkonium events is very similar to the standard MG/ME procedure. In the description below, points where the syntax is specific to quarkonium production have been highlighted. For the rest, the reader is invited to have a look to the MadGraph help page. 6 6 7 === <a name="How_to_use_the_code"></a>How to use the code ===7 === [=#How_to_use_the_code] How to use the code === 8 8 9 9 Just like the other processes that are tractable in MG/ME, you can decide to generate a new quarkonium prcocess and/or quarkonium events via one of the MG/ME clusters, or you can download the full or process-dependent code and run it on your computer. The inputs that should be entered for a new analysis have the same format in both cases. 10 ==== <a name="Edit_the_proc_card_dat_and_gener"></a>Generate a new process ====10 ==== [=#Edit_the_proc_card_dat_and_gener] Generate a new process ==== 11 11 12 12 You need to edit the file '''proc_card.dat:''' 13 13 * Enter the name of the process using the following format: 14 14 15 {{{pp>jcc~[3P12to445] 15 {{{ 16 pp>jcc~[3P12to445] 16 17 }}} 17 18 18 This corresponds to the production of a %$\chi_{c2}$% (PID=445) via an intermediate state with %$\normalsize 2S+1=3$%, %$\normalsize L=P$%, %$\normalsize J=2$%, %$\normalsize c=1$%, i.e. a spin-1, P-wave, color-singlet intermediate state. As another example:19 This corresponds to the production of a $\chi_{c2}$ (PID=445) via an intermediate state with $\normalsize 2S+1=3$, $\normalsize L=P$, $\normalsize J=2$, $\normalsize c=1$, i.e. a spin-1, P-wave, color-singlet intermediate state. As another example: 19 20 20 {{{pp>jbb~[1S01to551] 21 {{{ 22 pp>jbb~[1S01to551] 21 23 }}} 22 24 23 corresponds to the production of an %$\normalsize \eta_b$% via a color-singlet transition. For color-octet tranistion, the color index should be set to 8. If you have in mind to pass the events through Pythia for the showering and hadronization, you must be careful with the PI number of the state. Indeed, pythia uses a special label that contains the information on the color. For example, the PI number that should be used for the production of a J/psi via a color-octet transition is 9900443; 24 {{{pp>jcc~[3S18to9900443]}}} 25 corresponds to the production of an $\normalsize \eta_b$ via a color-singlet transition. For color-octet tranistion, the color index should be set to 8. If you have in mind to pass the events through Pythia for the showering and hadronization, you must be careful with the PI number of the state. Indeed, pythia uses a special label that contains the information on the color. For example, the PI number that should be used for the production of a J/psi via a color-octet transition is 9900443; 26 {{{ 27 pp>jcc~[3S18to9900443] 28 }}} 25 29 26 30 '''Also, pay attention:''' … … 28 32 the heavy-quark pair must be placed in that order, and at the end! For example, 29 33 30 {{{pp>jc~c[3P18to443] 34 {{{ 35 pp>jc~c[3P18to443] 31 36 }}} 32 37 33 38 or 34 39 35 {{{pp>cc~[3P18to443]j 40 {{{ 41 pp>cc~[3P18to443]j 36 42 }}} 37 43 … … 47 53 ==== Generate parton-level events ==== 48 54 49 You need to edit the usual files. If you edit the file param_card.dat, you will see that in addition to the sm parameters, you have a block called LDME. The parameters in this block correspond to the long distance matrix elements, expressed in the BBL normalization (see hep-ph/9407339). You can specify the value of the LDME's for each transition. The transition %$\normalsize n$%is indicated at the end of the line as a comment. For example, the line55 You need to edit the usual files. If you edit the file param_card.dat, you will see that in addition to the sm parameters, you have a block called LDME. The parameters in this block correspond to the long distance matrix elements, expressed in the BBL normalization (see hep-ph/9407339). You can specify the value of the LDME's for each transition. The transition $\normalsize n$ is indicated at the end of the line as a comment. For example, the line 50 56 51 57 {{{ … … 57 63 58 64 59 Note that only one LDME parameter is assigned to each transition %$^{2S+1}L_J^{[c]}$%. For example, for all the following processes65 Note that only one LDME parameter is assigned to each transition $^{2S+1}L_J^{[c]}$. For example, for all the following processes 60 66 61 || pp >j cc~[3S18to443] || color-octet %$\normalsize J/\psi$%production ||62 || pp > jcc~[3S18to10441] || color-octet %$\normalsize \chi_{c0}$%production ||63 || pp > jbb~[3S18to100553] || color-octet %$\normalsize \Upsilon(2S)$%production ||67 || pp >j cc~[3S18to443] || color-octet $\normalsize J/\psi$ production || 68 || pp > jcc~[3S18to10441] || color-octet $\normalsize \chi_{c0}$ production || 69 || pp > jbb~[3S18to100553] || color-octet $\normalsize \Upsilon(2S)$ production || 64 70 65 71 the same LDME parameter will be used in the param_card.dat. … … 96 102 97 103 104
