- His notes are clear.
- The A, B with B=0 approximation if lowest order chiral at low enegy.
- He hinted that at high energy things might change. Not sure in which way.
- The only non-trivial part is to calculate the definite integral.

# physics

## papers for neutral pion polarization

Find them here.

## Physics Meeting, November 7, 2011

tracking: simon

events that go forever in tracking

due to bad start counter hit

check added

calorimetry: will

will checked in new bcal reconstruction changes

still not the default

pid: Paul

no update on pid

b1pi partial wave analysis: Igor

shows plot of fitted amplitudes

cascade simulations: nathan

do better for single particles than when particles are in multi-particle event

mass production: Richard

no report

## Physics Meeting, September 12, 2011

- fiducial cuts are possible project for non-tracking-expert people to work on
- geometry sources, fcal in particular
- collaboration meeting talks

## object model for a kinematic fitter

- external classes
- constraints (pure virtual)
- measured data (hep vector)
- fitted data (hep vector)
- covariance matrix (hep matrix)
- unmeasured data (hep vector)

- member functions
- derivative finder
- minimizer

- arguments
- chisq
- chisq probability