The top quark is the most massive fundamental particle in the Standard Model. A new work makes a precision LHC measurement by using clever methods to reduce jet scale associated uncertainty. The bottom line value from the new work is:
m(t) = 172.5 ± 1.2 GeV
This compared to the PDG global average of:
m(t) = 172.4 ± 0.7 GeV
Prior measurements are summarized as follows:
More background is recapped at a previous post at this blog about the top quark mass.
Simultaneous extraction ofand from LHC differential distributions
We present a joint extraction of the strong couplingand the top-quark pole mass from measurements of top-quark pair production performed by the ATLAS and CMS experiments at the 8 TeV LHC. For the first time, differential NNLO theory predictions for different values of the top-quark mass are utilised for four kinematic distributions: the average transverse momentum of the top-quark, its average rapidity and the pair invariant mass and rapidity. The use of fastNLO tables for these distributions allows rapid evaluation of the differential theory predictions for different PDF sets. We consider the single differential distributions from the experiments both separately and in combination in order to obtain the best fit to theory. Our final values are and GeV which are compatible with previous extractions using top-quark measurements. In the case of , our value is also compatible with the world average value collated by the Particle Data Group.