W contribution

• W->e simulation based on POWHEG
• same as study in HFM (took files from official production on Grid)

W in PbPb

Comparison with CMS

• check calculation with CMS result (pPb W->e mid-rapidity)

• data vs. POWHEG : 108.8 / 100.623 = 1.08, 5.3% on data
• data vs. POWHEG : 81.0 / 72.48 = 1.1, 6.0% on data

Systematic uncertainty

• consider the difference between data and FONLL (based on CMS result): 15% on W->e spectrum
• it is < 1% on HFE level => negligible

-- ShingoSakai - 2015-09-17