about iseed on run_card.dat
Dear Madgraph Team,
I created a process with 600k events using Madgraph. I generate 1200 different events, 500 for each event. For example, I run a script from run_t8_001_e1 to run_t8_001_e60, which generates 3000 events with 60 different root files, and then use the hadd command to combine them. Then, I run another script where I define different directories, which generates events from run_t8_001_e61 to run_t8_001_e120. By continuing in this way, I created 600k events. Although the run names and directories were different in each script, I noticed an anomaly when checking the number of events and cross-section values for each execution.
For example, for the first 500 event generation process (run_t8_001_e1), the cross-section value is 7.71 and the number of events is 350. When I run the second script, and for the first 500 event generation process of that script (run_t8_001_e61), the cross-section value is 7.71 and the number of events is 350. Similarly, when I check run_t8_001_e900 (the first 500 run in the script), its cross-section value is 7.71 and the number of events is 350.
In all the scripts I use in this way, the cross-section value and the number of events for the first 500 events are the same, for the 30th are the same, and for the 45th are the same. For example, in every event production from 1 to 60, the cross-section value of the 9th production (run_t8_001_e9, run_t8_001_e18, run_t8_001_e27, ...) is 7.753 ± 0.12, and the number of event value is 472. The banner.txt file is created for every 500 production processes. When I check, I see different values such as 21 = iseed, 367 = iseed.
Is this normal? If it is abnormal, how can I solve it?
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