Changes between Initial Version and Version 1 of QuarkoniumProd


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Timestamp:
03/20/12 16:18:37 (8 years ago)
Author:
trac
Comment:

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  • QuarkoniumProd

    v1 v1  
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     3== Quarkonium MadGraph ==
     4
     5
     6
     7=== People ===
     8   1. Pierre Artoisenet
     9   1. Fabio Maltoni
     10   1. Tim Stelzer
     11
     12=== Aim of the project ===
     13Build an event generator for quarkonium physics.
     14
     15=== Tools ===
     16   * Madgraph/MadEvent v4 and StandAlone
     17
     18=== Work ===
     19We have identified two phases:
     20
     21   1. Add to MadGraph the possibility of generating pairs of heavy quarks (same or different flavors) with given quantum numbers, of spin, total angular momentum, color:  %$^{2S+1}L_J[1,8]$%,  for %$L=0,1$%.
     22   1. Interface it to MadEvent for event generation.
     23 
     24==== Physics results and papers writeup ====
     25
     26The paper phase 1 is out!
     27[http://arxiv.org/abs/0712.2770 MadOnia paper]
     28
     29
     30=== Preliminary code ===
     31The code phase 1 is done. The quarkonium amplitude generator has been interfaced with a basic phase space generator to produce cross sections and distributions.
     32The code is available under request.
     33In order to generate heavy quarkonium cross sections, you must:
     34
     35  '''1. Copy  the directory Template into my_proc'''
     36
     37  '''2. Edit the proc_card.dat in my_proc/Card/proc_card.dat.'''
     38
     39       You have to enter the parton-level process
     40
     41       IMPORTANT: THE HEAVY QQ bar PAIR MUST BE PLACED AT THE END OF THE LINE DEFINING THE PROCESS !!
     42
     43       The quantum numbers of the QQ bar pair are written in squared brackets using the spectroscopic notation
     44
     45       [(2S+1)LJC] with S=spin, L=orbital momentum, J= total momentum, C=color
     46
     47       For example, type gg>gcc~[3S11] if you want to consider gg > g + charmonium with S=1, L=0 J=1, c=1
     48       (J/psi production via a color-singlet transition)
     49
     50       see also an example of proc_card.dat in the Template.
     51
     52  '''3. go into my_proc/bin and type "./newprocess"'''
     53
     54  '''4. Fill in the two input files my_proc/Cards/param_card.dat and my_proc/Cards/run_card.dat'''
     55
     56  '''5. go to my_proc/SubProcesses/P???'''
     57
     58       P??? is a specific process that you have requested in the proc_card.dat.
     59
     60  '''6.  type "make"  and then  ./cross_section''' 
     61       
     62       the PT and rapidity distributions of the quarkonium state are written in the file histogram.dat
     63
     64
     65Remarks:
     66
     67   * We use the BBL normalization for the long distance matrix elements.
     68
     69
     70=== MadOnia version II ===
     71
     72
     7311/2008: Phase 2 is done! MG_ME is been upgraded with the MadOnia implementation. Production of quarkonium unweighted events has been successfully tested.
     74
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     76
     77-- Main.PierreArtoisenet - 25 Nov 2008
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