Issue with FSR

[ram1123]

If I run the post-proc.py on 2018 sample

root://cms-xrd-global.cern.ch//store/mc/RunIISummer20UL18NanoAODv9/GluGluHToZZTo4L_M125_TuneCP5_13TeV_powheg2_JHUGenV7011_pythia8/NANOAODSIM/106X_upgrade2018_realistic_v16_L1v1-v1/120000/3ED05633-EBB7-4A44-8F9D-CD956490BCFD.root

Then, why I don't see change in electrons pT with and without FSR corrections?

root [8] Events->Scan("Electron_Fsr_pt:Electron_pt")
***********************************************
*    Row   * Instance * Electron_ * Electron_ *
***********************************************
*        0 *        0 *           *           *
*        1 *        0 * 18.990409 * 18.990409 *
*        1 *        1 * 16.583242 * 16.583242 *
*        2 *        0 * 48.219650 * 48.219650 *
*        2 *        1 * 39.277820 * 39.277820 *
*        2 *        2 * 20.207082 * 20.207082 *
*        2 *        3 * 14.563079 * 14.563079 *
*        3 *        0 * 7.0428443 * 7.0428443 *
*        4 *        0 * 73.734298 * 73.734298 *
*        4 *        1 * 30.262565 * 30.262565 *
*        5 *        0 * 44.129936 * 44.129936 *
*        5 *        1 * 29.987285 * 29.987285 *
*        6 *        0 * 23.190958 * 23.190958 *
*        6 *        1 * 19.566717 * 19.566717 *
*        6 *        2 * 6.8791084 * 6.8791084 *
***********************************************

[YujiLee301]

Hi @ram1123 , please take a look at this link: https://cms-nanoaod-integration.web.cern.ch/autoDoc/NanoAODv9/2018UL/doc_TTToSemiLeptonic_TuneCP5_13TeV-powheg-pythia8_RunIISummer20UL18NanoAODv9-106X_upgrade2018_realistic_v16_L1v1-v1.html#FsrPhoton

Actually, Electron emitted Fsr is not included in 2018 nanoAODv9 files, so that it should be normal without out fsr correction effects in electron Pt.

[YujiLee301]

root [1] Events->Scan("Muon_Fsr_pt:Muon_pt")
***********************************************
*    Row   * Instance * Muon_Fsr_ *   Muon_pt *
***********************************************
*        0 *        0 * 49.795711 * 49.819477 *
*        0 *        1 * 41.317871 * 41.310253 *
*        0 *        2 * 18.388391 * 18.390398 *
*        0 *        3 * 10.847580 * 10.853824 *
*        1 *        0 * 37.543960 * 37.581779 *
*        1 *        1 * 23.331556 * 23.328424 *
*        2 *        0 *           *           *
*        3 *        0 * 37.023590 * 37.016601 *
*        3 *        1 * 26.510793 * 26.524539 *
*        3 *        2 * 19.639116 * 19.636175 *
*        3 *        3 * 13.127684 * 13.111321 *
*        4 *        0 * 23.316522 * 23.283086 *
*        4 *        1 * 7.9784674 * 7.9790015 *
*        5 *        0 * 17.580966 * 17.536348 *
*        5 *        1 * 13.819821 * 13.795978 *
*        6 *        0 * 17.786832 * 17.739158 *
*        6 *        1 * 13.375747 * 13.356995 *
*        6 *        2 * 3.4277958 * 3.4404506 *
***********************************************

Hi @ram1123 , here's muon Fsr comparison. It actually works.

[ram1123]

Let's check the same with the 2022 samples, then we will close this issue.