====== LH Accord for scale variations ======
People: João Pires, Kostas Theofilatos, Joey Huston, Mario Campanelli ... (**add your name** if you are interested)


===== Notes from the discussion in LH =====
Slides: [[:2017:scales_pires.pdf | scale choices]] 

   * decompose inclusive PT distributions to the sum of PT1, PT2, PT3, PT4+ (possible follow-up from the planned experimental measurements), (award is: bet of free coffee from Daniel Maitre) 
   * what about other scales HT/2
   * cone size dependences  
   * Gregors Soyez suggestion for DR-informed scale varition for large and small anglularly separated jets (?) [to be further clarified]

===For more details, see the notes for the Fixed Order vs ME+PS comparisons for inclusive jets ====

====Scale choices in ratios====
   *understand degree of scale cancellations in ratios of cross sections by comparing NLO predictions with corresponding NNLO ones, i.e. W+>=1 jet/Z+>=1 jet, H+>=1 jet/Z+>=1 jet at NLO and at NNLO, using same central scale and variations about that scale
===sub-set of questions from Cambridge Scales workshop:===
   *Ratios of cross sections; we can categorize situations where the choice of the same (or similar) scale for the numerator and denominator is warranted; in order of strength of validity -ratio of same cross section at different energies
   *ratio of same cross section at different rapidities
   *ratio of n/n-1 jet cross sections
   *ratio  of X+n jet/Y+ n jet, where X and Y are similar, i.e. W and Z
   *ratio of X+n jet/Y+ n jet, where X and Y are dissimilar, i.e. W and H