1. H1 FPS + ZEUS LPS1 H1 / ZEUS data consistency α β=0.56,x IP =0.0025 β=0.018,x IP =0.0085 Q2Q2 (β, x IP ) bins, where there is a tension between H1 HERA2 and ZEUS LPS2 data

2. H1 FPS + ZEUS LPS2 H1 / ZEUS hadron energy scale H1 had scale uncertainty is (+) at β>0.1 and (-) at β<0.1, its abs value is comparable with H1 stat+unc uncertainty σ(H1) / σ(ZEUS)>1 at β>0.1 and <1 at β<0.1  Combination fit shifts H1 data ↓ at β>0.1 and ↑ at β<0.1, i.e. opposite to H1 had scale uncertainty ZEUS stat+unc uncertainty is much larger than had energy scale uncertainty

3. H1 FPS + ZEUS LPS3 H1 / ZEUS hadron energy scale Result of H1 HERA2 + ZEUS LPS2 combination fit δ shift δ reduction 1 HadEn1_h1 -1.6112 0.5693 16 Ehscale_zeus -0.0215 0.5496 toy simulation of random data to reproduce abs values of H1 and ZEUS stat+unc and had energy scale uncertainties + implement artificial shift of random data at +1δ for H1 and -1δ for ZEUS Result of combination fit for random data which reproduce H1 and ZEUS uncertainties δ shift δ reduction 1 rndm_h1 -0.9295 0.5958 2 rndm_zeus 0.0069 0.6941