Stability check of Mw(qqqq) and Mw(qqlv). … update… PCUT in 4q and qqlv channel. Marie Legendre, Djamel Boumediene, Patrice Perez, Eric Lancon, Oliver Buchmüller. Quantification of the effect. qqlv channel. qqqq channel. Effect of object pre-selection on Mw(qqlv).
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Stability check of Mw(qqqq) and Mw(qqlv)
PCUT in 4q and qqlv channel
Quantification of the effect
Effect of object pre-selection on Mw(qqlv)
qqlv no pre-selection
qqlv with pre-selection
after pre-selection Mw(pcut) is almost flat (Proba=23%)!
W mass shift (pre-selection)
W mass before and after pre-selection:
Mw = Mw(standard)-Mw(pre)=-89 +- 20 MeV
Which mass is the correct one?
use charged tracks only to measure Mw (4q)
-> charged tracks are well modeled in the MC. Hence can be used as “reference measurement”
With respect to standard
Mw = Mw(standard)-Mw(charged only)=123+-95 MeV
Since the neutral objects (especially) are not well modeled in the MC
they should not be used for the evaluation of the jet directions
However, total energy simulation seems to be ok!
Calculated the directions of the jets using charged tracks
only and rescale P with the Energy of the jet determined from
all objects (charged+neutrals)