Title: Precise tracker momentum-scale determination for precision mass measurements.
Presenter: Graham Wilson (Univ of Kansas) in person

A key goal for any future e+e- collider is the precision measurement of the masses of 
known fundamental particles such as the top quark and the Higgs, W, and Z bosons. 
The measurement of the absolute center-of-mass energy is a primary issue for most 
determinations. Our previous work, documented in arXiv:2209.03281 and arXiv:2308.10414, 
demonstrated that the center-of-mass energy may be reconstructed with high statistical 
precision using dilepton events at an e+e- collider using a momentum-based 
estimator, sqrt(sp), and likely with small and controllable systematic uncertainty 
associated with the dilepton method itself.
This leaves the primary source of systematic uncertainty on the center-of-mass energy 
scale arising from knowledge of the tracker momentum-scale.
By using particle decays, especially of Kshort mesons and Lambda baryons in 
addition to J/psi mesons, one can constrain the tracker momentum-scale and as 
a by-product improve the mass measurements for various hadrons. 
The method is based on the Armenteros-Podolanski construction in 
the semi-ellipse of the decay particles longitudinal momentum asymmetry 
and momentum transverse to the parent flight direction. 
The method, discussed initially by Rodriquez et al [arXiv: 2012.03620] and presented 
for the first time at LCWS2021 by Wilson, leverages the very well known pion and 
proton daughter masses and not just the well known parent and daughter masses in 
the J/psi case. This method, if proven realistic, has the potential to open up a 
comprehensive precision polarized Z scan physics program with well controlled 
center-of-mass energy systematic uncertainties. More realistic studies including not 
just an overall momentum scale, but also effects such as non-linearities from energy loss, 
will be presented. It is envisaged that the momentum-scale can be measured to about 
2.5 ppm for each batch of 10 million hadronic Z events.