Update WJets xsec

analysis/framework/dataset_map.py

+import numpy as np
+
 dataset_map = {
     "2018ul": {
         "dataA": {
@@ -540,9 +542,11 @@ cross_sections = {
         "cross_section_up": 12.19,
         "cross_section_down": 12.15,
     },
+    # https://twiki.cern.ch/twiki/bin/viewauth/CMS/StandardModelCrossSectionsat13TeV
+    # Needs to be x3 for fermion BR
     "WJetsToLNu": {
-        "cross_section": 67350.0,  # from xsdb
-        "cross_section_up": 67636.2,
-        "cross_section_down": 67063.8,
+        "cross_section": 20508.9 * 3,
+        "cross_section_up": (20508.9 + np.sqrt(165.7**2 + 770.9**2)) * 3,
+        "cross_section_down": (20508.9 - np.sqrt(88.2**2 + 770.9**2)) * 3,
     },
 }