[Halld-tagger] [EXTERNAL] Fwd: Accidental subtraction

[Shepherd, Matthew]

Hi Richard,

> On Feb 20, 2023, at 11:08 AM, Richard Jones <richard.t.jones at uconn.edu> wrote:

>  Likewise with trying to measure an absolute differential cross section for the a2 over a continuum of rho,pi using amplitude analysis to extract the a2 part. The problem I am pointing to here is this: what to use for the flux is no longer model-independent if you are not doing proper accidentals subtraction.

Not sure I understand the details here... "model-independent"?

When doing amplitude analysis the output of the analysis is a tagged, acceptance-corrected yield over a range of beam energy.  We then used a tagged flux to turn this number into a cross section.  When obtaining the tagged acceptance corrected yield, we can use two methods of handling pileup of beam photons in the signal RF bin and they produce the same result.

Matt

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