[Halld-cal] fcal in the trigger

[Alexander Somov]

Sean,

I am sorry for the late response, was too busy yesterday.

In general, the statement:

"... you should get an accurate sample in the limit of large data sets".

is wrong.


An example of MC simulation, you reconstruct pi0 by detecting photons
in two detectors. Each detector is alive for the first 50 % of time
and then turns bad.

Assume that you generate 1000 events. The number of reconstructed pi0 is 
500.

Now, you introduce reconstruction efficiencies, 50 % for each detector.
The number of reconstructed pi0 is  N_gen*Eff*Eff = 250.

---

In general, sub-samples have to be generated for each period of run, where
detector perfomance conditions are the same.

---

I can help you with FCAL mask (it's trivial) if Matt is busy and there is 
no manpower for that.


Alex








On Thu, 18 Jan 2018, Sean Dobbs wrote:

> Alex,
>
> Yes, we generally try to generate a representative set of simulations for a
> run period, so whether the constants are set on a run-by-run basis or
> averaged over several runs, you should get an accurate sample in the limit
> of large data sets.
>
> Cheers,
> Sean