[Halld-cal] updated FCAL mc response study

[Sean Dobbs]

Hi Richard,

Just to confirm, the results you showed at the HDGeant4 meeting today
depend on some changes which are not merged to the "official" HDGeant4
repository, right?

We should revisit the study that Matt performed after they are merged in.

By the way, I think the best documentation for the procedure that was
previously followed is the logbook entry linked in the entry in Matt's
original post:  https://logbooks.jlab.org/entry/3504395

---Sean

On Tue, Mar 26, 2019 at 7:25 PM Richard Jones <richard.t.jones at uconn.edu> wrote:
>
> Hello Matt,
>
> I don't know how to address it further, without a technical note or some written record of what was done in the earlier study. The code that is checked into master for both hdgeant and hdgeant4 that affects the fcal simulation is good to go. The consistency between the two simulations is also very good at the level of the total reconstructed shower response. Of course there could be surprises, but I do not anticipate needing to update either simulation as touching electromagnetic showers in the fcal in the future -- unless you find something that demands it of course.
>
> -Richard Jones
>
> On Tue, Mar 26, 2019 at 3:41 PM Shepherd, Matthew <mashephe at indiana.edu> wrote:
>>
>>
>> Hi Richard,
>>
>> > On Mar 25, 2019, at 7:28 AM, Richard Jones <richard.t.jones at uconn.edu> wrote:
>>
>> > I understand your concern that something has changed in the MC, but other things could have changed as well, for example the cluster algorithm in the fcal or the nonlinear correction applied to the reconstructed fcal cluster energy. Any of these would change the behavior of the results I show.
>>
>> The only changes appear to be in the code that deals with the MC response of the detector.  The clustering algorithm hasn't change and the nonlinear correction is the very thing we are discussing:  it worked, then it didn't.
>>
>> We will retune once we get the green light that all low level changes have been made and propagated into the master for use.
>>
>> Matt
>
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