factorize breit wigner functions to provide method to calculate amp f…

[lan13005]

The overall goal is to factorize the computation a bit so that we have access to the amplitude as a function of masses instead of 4-vectors.

The current use case for this is to be able to extract the BW amplitude's complex contribution so that we can compare the binned moments (calculated from the partial waves) to the moments directly calculated from the data.

I compiled BreitWigner locally and loaded it with my python wrapper. I thought I should make this modification for BreitWigner3body also, so I did.

Please squash this commit as there are some stupid minor errors I made

mass0 = "1.32"
width0 = "0.1"
orbitaL = "2"
daughter1 = "0" # shouldn't matter
daughter2 = "1" # shouldn't matter
args = [mass0, width0, orbitaL, daughter1, daughter2]
bw = BreitWigner(args)

meas_mass0 = 1.32
meas_mass1 = 0.135
meas_mass2 = 0.545
amplitude = bw.calcAmplitudeFromMasses(meas_mass0, meas_mass1, meas_mass2)

print(amplitude) # returns (-0+4.472672532485287j) which makes sense. Amplitude at peak is purely imaginary

[gluex]

Build status for this pull request: FAILURE

Build log: /work/halld/pull_request_test/halld_sim^factorize_breitwigners/make_factorize_breitwigners.log
Build report: /work/halld/pull_request_test/halld_sim^factorize_breitwigners/report_factorize_breitwigners.txt
Location of build: /work/halld/pull_request_test/halld_sim^factorize_breitwigners

[gluex]

Build status for this pull request: FAILURE

Build log: /work/halld/pull_request_test/halld_sim^factorize_breitwigners/make_factorize_breitwigners.log
Build report: /work/halld/pull_request_test/halld_sim^factorize_breitwigners/report_factorize_breitwigners.txt
Location of build: /work/halld/pull_request_test/halld_sim^factorize_breitwigners

[gluex]

Test status for this pull request: SUCCESS

Summary: /work/halld/pull_request_test/halld_sim^factorize_breitwigners/tests/summary.txt
Logs: /work/halld/pull_request_test/halld_sim^factorize_breitwigners/tests/log

Build log: /work/halld/pull_request_test/halld_sim^factorize_breitwigners/make_factorize_breitwigners.log
Build report: /work/halld/pull_request_test/halld_sim^factorize_breitwigners/report_factorize_breitwigners.txt
Location of build: /work/halld/pull_request_test/halld_sim^factorize_breitwigners