Lower the muon pt threshold for nanoAOD.

Author: hqucms

Configuration/Eras/python/Era_Run3_2025_cff.py

@@ -5,6 +5,7 @@
 from Configuration.Eras.Modifier_run3_CSC_2025_cff import run3_CSC_2025
 from Configuration.Eras.Modifier_stage2L1Trigger_2025_cff import stage2L1Trigger_2025
 from Configuration.Eras.Modifier_run3_SiPixel_2025_cff import run3_SiPixel_2025
+from Configuration.Eras.Modifier_run3_nanoAOD_2025_cff import run3_nanoAOD_2025
 from Configuration.ProcessModifiers.ecal_cctiming_cff import ecal_cctiming
 
-Run3_2025 = cms.ModifierChain(Run3_2024, run3_GEM_2025, stage2L1Trigger_2025, run3_SiPixel_2025, run3_CSC_2025, ecal_cctiming)
+Run3_2025 = cms.ModifierChain(Run3_2024, run3_GEM_2025, stage2L1Trigger_2025, run3_SiPixel_2025, run3_CSC_2025, run3_nanoAOD_2025, ecal_cctiming)

Configuration/Eras/python/Modifier_run3_nanoAOD_2025_cff.py

@@ -0,0 +1,4 @@
+import FWCore.ParameterSet.Config as cms
+
+# for 2025 data-taking (and possibly also 2026)
+run3_nanoAOD_2025 = cms.Modifier()

Configuration/Eras/python/Modifier_run3_nanoAOD_devel_cff.py

@@ -0,0 +1,4 @@
+import FWCore.ParameterSet.Config as cms
+
+# modifier for Run3 nanoAOD development beyond v15
+run3_nanoAOD_devel = cms.Modifier()

PhysicsTools/NanoAOD/python/muons_cff.py

@@ -84,6 +84,13 @@
     cut = cms.string("pt > 15 || (pt > 3 && (passed('CutBasedIdLoose') || passed('SoftCutBasedId') || passed('SoftMvaId') || passed('CutBasedIdGlobalHighPt') || passed('CutBasedIdTrkHighPt')))")
 )
 
+# lower the muon pt threshold to 2 GeV
+(run3_nanoAOD_2025 | run3_nanoAOD_devel).toModify(
+    finalMuons,
+    cut = cms.string("pt > 15 || (pt > 2 && (passed('CutBasedIdLoose') || passed('SoftCutBasedId') || passed('SoftMvaId') || passed('CutBasedIdGlobalHighPt') || passed('CutBasedIdTrkHighPt')))")
+)
+
+
 finalLooseMuons = cms.EDFilter("PATMuonRefSelector", # for isotrack cleaning
     src = cms.InputTag("slimmedMuonsWithUserData"),
     cut = cms.string("pt > 3 && track.isNonnull && isLooseMuon")

PhysicsTools/NanoAOD/python/nano_eras_cff.py

@@ -19,6 +19,8 @@
 from Configuration.Eras.Modifier_run3_common_cff import run3_common
 from Configuration.Eras.Modifier_run3_nanoAOD_pre142X_cff import run3_nanoAOD_pre142X
 from Configuration.Eras.Modifier_run3_jme_Winter22runsBCDEprompt_cff import run3_jme_Winter22runsBCDEprompt
+from Configuration.Eras.Modifier_run3_nanoAOD_2025_cff import run3_nanoAOD_2025  # for 2025 data-taking (and possibly also 2026)
+from Configuration.Eras.Modifier_run3_nanoAOD_devel_cff import run3_nanoAOD_devel  # for development beyond v15
 
 run2_nanoAOD_ANY = (
     run2_nanoAOD_106Xv2