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2023:groups:smhiggs:higgs-cell-resample:start [2023/06/16 11:48]
stephen.jones
2023:groups:smhiggs:higgs-cell-resample:start [2023/06/18 16:23] (current)
stephen.jones
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 ===== Negative Weight Mitigation (also for Higgs Signal/​Background?​) ===== ===== Negative Weight Mitigation (also for Higgs Signal/​Background?​) =====
 +
 +**Code**: [[https://​github.com/​a-maier/​cres|cres]]
 +
 +== Specific Topics ==
 +  * Apply cell resampling ([[https://​arxiv.org/​abs/​2109.07851|paper 1]] [[https://​arxiv.org/​abs/​2303.15246|paper 2]] [[https://​github.com/​a-maier/​cres|source]] [[https://​cres.hepforge.org/​|binaries]]) to Higgs signal/​background (closure tests, measure of simplification e.g. #event reduction)
 +  * Graph of fraction of negative weights for Higgs processes/​background (slide 5/9 [[https://​phystev.cnrs.fr/​wiki/​_media/​2023:​cell_resampling.pdf|Jeppe talk]])
 +
 +== Processes ==
 +  * di-photon NLO sample (m_gamgam centred around Higgs mass window)
  
 == General Topics == == General Topics ==
-  * Graph of fraction of negative weights for Higgs processes/​background (slide 5/9 Jeppe talk) 
   * Discussion on good metrics (what to compare before considering events close)   * Discussion on good metrics (what to compare before considering events close)
   * Measure the impact on reals vs virtuals, which events are most likely to be altered and by how much?   * Measure the impact on reals vs virtuals, which events are most likely to be altered and by how much?
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 == Talk Discussion (winner: most questions per talk) == == Talk Discussion (winner: most questions per talk) ==
-  * q: why is w+5 improving more than z+3? +  * Q: why is w+5 improving more than z+3? 
     - initial event sample size? (no, both have 1e9)     - initial event sample size? (no, both have 1e9)
     - dipole cut vs improvement?​ (check dipole cut used)     - dipole cut vs improvement?​ (check dipole cut used)
-  * q: calculating density of events to "​pre-check"​ that this algorithm may work? +  * Q: calculating density of events to "​pre-check"​ that this algorithm may work? 
-  * q: metric needs to be compatible with how ps generator is populating ps, proof that this is not biasing anything? +  * Q: metric needs to be compatible with how ps generator is populating ps, proof that this is not biasing anything? 
-  * q: should there be a bias towards positive values (since you iteratively add nearest event until wi>=0)?+  * Q: should there be a bias towards positive values (since you iteratively add nearest event until wi>=0)?
     - ps generator dependent because this alters which events are clustered, can this have an impact on the physics?     - ps generator dependent because this alters which events are clustered, can this have an impact on the physics?
-  * q: plotting statistical uncertainties on the original sample ​+  * Q: plotting statistical uncertainties on the original sample ​
     - more easily allows verifying that differences are within statistical uncertainty     - more easily allows verifying that differences are within statistical uncertainty
-  * q: on which type of event does this have the biggest impact?+  * Q: on which type of event does this have the biggest impact?
     - imagine reals are more impacted than virtual ​     - imagine reals are more impacted than virtual ​
     - we were completely agnostic     - we were completely agnostic
- +  ​Q: can we really prove that this does not alter distributions?​ (prove that you preserve distributional structure of the observables you compute)
-  ​q: can we really prove that this does not alter distributions?​ (prove that you preserve distributional structure of the observables you compute)+
     - we do not alter any of the event kinematics     - we do not alter any of the event kinematics
     - there is no cross talk of events separated by more than the maximum allowed distance     - there is no cross talk of events separated by more than the maximum allowed distance
     - IRC safe measure important, but this is not a sufficient condition, can you reproduce infrared sensitive observables (e.g. Sudakov shoulder, 0-bin of ptZ), can your smearing reproduce this feature in the limit that the smearing goes to 0?     - IRC safe measure important, but this is not a sufficient condition, can you reproduce infrared sensitive observables (e.g. Sudakov shoulder, 0-bin of ptZ), can your smearing reproduce this feature in the limit that the smearing goes to 0?
- +  ​Q: mean/​median/​width of the cell resampling bins
-  ​q: mean/​median/​width of the cell resampling bins+
     - we have plots that we can examine     - we have plots that we can examine
- 
-== Specific Topics == 
-  * Apply cell resampling ([[https://​arxiv.org/​abs/​2109.07851|paper 1]] [[https://​arxiv.org/​abs/​2303.15246|paper 2]] [[https://​github.com/​a-maier/​cres|source]] [[https://​cres.hepforge.org/​|binaries]]) to Higgs signal/​background (closure tests, measure of simplification e.g. #event reduction) 
- 
-== Processes == 
-  * di-photon NLO sample (m_gamgam centred around Higgs mass window) 
- 
  
2023/groups/smhiggs/higgs-cell-resample/start.1686908881.txt.gz · Last modified: 2023/06/16 11:48 by stephen.jones