udpating 2018 MC and Data GT; also fixing JER SF calcuation

[panwarlsweet]

• updating 2018 SF for MC and Data where bug related to JER SF has been fixed slide 6 https://indico.cern.ch/event/920726/contributions/3868370/attachments/2055396/3446379/20-06-11_News_PPD.pdf

• Fixing the JER SF calculation as recommend by JME converens in the HN post [1] to make it pt dependent. https://hypernews.cern.ch/HyperNews/CMS/get/jes/1006/1/1/1.html

Tested setup with 2018 GTs and new updates in the smearing sf calculation. works fine

For more deatils of pt related SF, this TWiki can be read https://twiki.cern.ch/twiki/bin/viewauth/CMS/JetResolution#Smearing_procedures

[simonepigazzini]

@edjtscott @malcles do we intend to include this updates for all analyses?

[edjtscott]

yes, all analyses should update with this. Since it should be a very small effect, we think it's fine if analyses in a rush (e.g. for an ICHEP PAS) don't delay only for this reason though