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Incorrect scintillation sigma calc #123

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agoose77 opened this issue Jan 9, 2018 · 0 comments
Open

Incorrect scintillation sigma calc #123

agoose77 opened this issue Jan 9, 2018 · 0 comments

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@agoose77
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agoose77 commented Jan 9, 2018 •
edited

source/hitprocess/clas12/ec_hitprocess.cc

Line 234 in 9b2cf10

double sigma = ecc.pmtFactor/sqrt(EC_npe);

I could be wrong, but given that
SNR=NPE/sigma, then sigma = NPE/SNR. With the RCA handbook giving SNR=sqrt(NPE)/pmtFactor, shouldn't the code linked above be calculating sigma as sigma=sqrt(NPE)*pmtFactor?

In the source it mentions

Note: GSIM sigma was incorrect (used 1/sigma for sigma).

But I am not sure quite what this refers to.
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