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pegasus:showering [16/06/2020 12:45] – lipatovpegasus:showering [26/02/2025 10:53] (current) – [Table] lipatov
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 To perform simulation of TMD parton showers and/or hadronization one  To perform simulation of TMD parton showers and/or hadronization one 
-have to process the PEGASUS output in [[https://arxiv.org/abs/hep-ph/0609017|Les Houches Event format]] (''*.lhe'') with  Monte-Carlo event generator [[https://cascade.hepforge.org|CASCADE]].+has to process the PEGASUS output in [[https://arxiv.org/abs/hep-ph/0609017|Les Houches Event format]] (''*.lhe'') with  Monte-Carlo event generator [[https://cascade.hepforge.org|CASCADE]].
 In the collinear factorization scenario, one can use a conventional showering program as implemented into the [[http://home.thep.lu.se/Pythia|PYTHIA 8.2]].  In the collinear factorization scenario, one can use a conventional showering program as implemented into the [[http://home.thep.lu.se/Pythia|PYTHIA 8.2]]. 
  
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 **to reconstruct the TMD initial state parton showers, the TMD gluon density from CCFM or PB families should be chosen.** **to reconstruct the TMD initial state parton showers, the TMD gluon density from CCFM or PB families should be chosen.**
  
-To produce an [[https://arxiv.org/abs/hep-ph/0609017|Les Houches Event]] file with PEGASUS please follow the [[pegasus:manual|manual]]. Shortly,+To produce a [[https://arxiv.org/abs/hep-ph/0609017|Les Houches Event]] file with PEGASUS please follow the [[pegasus:manual|manual]]. Shortly,
 one should choose the process by double-clicking, limit the phase space in order to record only necessary events, and check the //"Generate Les Houches Event file"// box in the lower left corner. One then starts the calculation with the //Start// button (or //F5//). The produced ''*.lhe'' file will be created in the PEGASUS folder one should choose the process by double-clicking, limit the phase space in order to record only necessary events, and check the //"Generate Les Houches Event file"// box in the lower left corner. One then starts the calculation with the //Start// button (or //F5//). The produced ''*.lhe'' file will be created in the PEGASUS folder
 and is ready to use with the [[https://cascade.hepforge.org|CASCADE]]. and is ready to use with the [[https://cascade.hepforge.org|CASCADE]].
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 Other parameters define, in particular, whether you turn the fragmentation and showers on or off. You can set them as you need. Importantly, one has to set the ''IGLU'' parameter corresponding to the TMD gluon density, used in the ''*.lhe'' file calculation. The TMD number can be found in the ''*.lhe'' file, it corresponds to the [[https://tmdlib.hepforge.org/doxy/html/pdfsets.html|TMDLib numbering scheme]]. PEGASUS uses the following of them (see [[pegasus:overview|Overview]]). The ''ICCF'' parameter should be defined according to the used TMD gluon distribution. Other parameters define, in particular, whether you turn the fragmentation and showers on or off. You can set them as you need. Importantly, one has to set the ''IGLU'' parameter corresponding to the TMD gluon density, used in the ''*.lhe'' file calculation. The TMD number can be found in the ''*.lhe'' file, it corresponds to the [[https://tmdlib.hepforge.org/doxy/html/pdfsets.html|TMDLib numbering scheme]]. PEGASUS uses the following of them (see [[pegasus:overview|Overview]]). The ''ICCF'' parameter should be defined according to the used TMD gluon distribution.
  
-^ PEGASUS      ^  CASCADE/TMDLib      ^  IGLU      ^  ICCF  ^ +^ PEGASUS               ^  CASCADE/TMDLib             ^  IGLU    ^  ICCF  ^ 
-| A0 (CCFM)  |  ccfm-setA0  |  101010  | 1 | +| LLM'2024 (CCFM)       |  LLM-2024                   | 101501   | 1      | 
-| B0 (CCFM)  |  ccfm-setB0  |  101020  | 1 | +| LLM'2022 (CCFM)       |  LLM-2022                   |  101601  | 1      | 
-| JH'2013 set 1 (CCFM)  |  ccfm-JH-2013-set1  |  101201  | 1 | +| A0 (CCFM)             |  ccfm-setA0                 |  101010  | 1      | 
-| JH'2013 set 2 (CCFM)  |  ccfm-JH-2013-set2  |  101301  | 1 |  +| B0 (CCFM)             |  ccfm-setB0                 |  101020  | 1      | 
-| PB NLO set 1  |  PB-NLO-HERAI+II-2018-set1  |  102100  | 2 | +| JH'2013 set 1 (CCFM)  |  ccfm-JH-2013-set1          |  101201  | 1      | 
-| PB NLO set 2  |  PB-NLO-HERAI+II-2018-set2  |  102200  | 2 | +| JH'2013 set 2 (CCFM)  |  ccfm-JH-2013-set2          |  101301  | 1      | 
 +| PB NLO set 1          |  PB-NLO-HERAI+II-2018-set1  |  102100  | 2      | 
 +| PB NLO set 2          |  PB-NLO-HERAI+II-2018-set2  |  102200  | 2      |
  
-The path to the LHE file to be processes is defined by ''CLHE''. +The path to the ''*.lhe'' file to be processes is defined by ''CLHE''. 
  
 NOTE: NOTE:
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 </code> </code>
  
-The produced [[https://www.sciencedirect.com/science/article/pii/S0010465500001892?via%3Dihub | HepMC]] file can be then processed to form necessary cross sections. Note that the weighted events from PEGASUS are normalized by CASCADE, so one should multiply the weights by the total cross section during processing. The total cross section can be found in the CASCADE output or in the LHE file.+The produced [[https://www.sciencedirect.com/science/article/pii/S0010465500001892?via%3Dihub | HepMC]] file can be then processed to form necessary cross sections. Note that the weighted events from PEGASUS are normalized by CASCADE, so one should multiply the weights by the total cross section during processing. The total cross section can be found in the CASCADE output or in the ''*.lhe'' file.
  
-In the collinear factorization scenario, we successfully tested the compatibility of +In the collinear QCD factorization scenario, we successfully tested the compatibility of 
-generated LHE file with [[http://home.thep.lu.se/Pythia|PYTHIA 8.2]].  +generated ''*.lhe'' file with [[http://home.thep.lu.se/Pythia|PYTHIA 8.2]].  
-One can use the following page as a guide to link LHE-file with PYTHIA.+One can use the [[http://home.thep.lu.se/~torbjorn/pythia82html/Welcome.html|following page]] as a guide to link ''*.lhe'' file with [[http://home.thep.lu.se/Pythia|PYTHIA 8.2]].
pegasus/showering.1592311540.txt.gz · Last modified: by lipatov