Update 2017 JEC + JER SFs (Nov. 29, 2018)

[abrinke1]

1) Jet Energy Corrections based on Fall17 94x MC and 2017 “17Nov2017” Data: Fall17_17Nov2017_V32. These corrections include the fix for the FormulaEvaluator issue, discussed in [1] and updated parametrization of pile up offset jet energy corrections [2]. Also, thanks to better understanding of the data, the uncertainties are reduced with respect to the previous release. The MC based Jet Energy Corrections are provided for AK4/AK8 PF, CHS and PUPPI jets. Both, the mean values of the corrections and the uncertainties are updated in respect to the previous release. The residual JEC have been derived for AK4 PF+CHS jets. For other jet types, these are clones of AK4 PF+CHS. The correction uncertainties estimate is also based on AK4CHS. The txt and SQLite files can be retrieved from JECDatabase GitHub repository. The links are provided on the twiki page:

https://twiki.cern.ch/twiki/bin/view/CMS/JECDataMC

The data taken during 2017 is not uniform, therefore corrections are derived for 4 periods of data, corresponding to the run periods B, C, D+E and F. The SQLite (Fall17_17Nov2017_V32_94X_DATA.db) file contains all four sets of JEC.

2) Jet Energy Resolution SFs measurement with 2017 data is finalised. The nominal values, as well as the full uncertainty estimate, are available now in JER version Fall17_V3 [3].

More details about JEC and JER updates can be found in the dedicated report at JME meeting [4] and comparison with old JEC version are presented in [5].

We would like to thank all people who worked really hard on the MCTruth update, residuals measurement, uncertainty estimate, and resolution scale factors extraction during the last months to make this release happen.

Best regards,

Anastasia for the Jet Energy Correction and Resolutions group

[1] https://hypernews.cern.ch/HyperNews/CMS/get/jes/770.html

[2] https://indico.cern.ch/event/772314/#5-changes-in-mctruth-2017-jec

[3] https://twiki.cern.ch/twiki/bin/view/CMS/JetResolution#JER_Scaling_factors_and_Uncertai

[4] https://indico.cern.ch/event/775563/#3-report-from-jerc

[5] https://indico.cern.ch/event/776439/#9-sanity-check-of-2017-jec-vit

[bortigno]

move to #28

[bortigno]

Maybe is good to keep this separate so we know that this version of the JEC has gone in