[G14_run] [EXTERNAL] Re: Misidentified protons as neutrons

[Alessandra Filippi]

Hi Tsuneo,

>  As for the neutron data, in order to exclude events in which protons are misidentified
> 
> as neutrons, are you considering dead or inefficient SC paddles ?

yes, I am.

> 
> It is not clear if you are cosidering this from the sentences at page 119 of your note;

ok, the neutron part is even more "work in progress" than that on the 
proton... many pieces are missing, so it is not very advisable to read it 
as it is now. Anyway, for sure I hadn't written about this, thnk you for 
reminding.

> 
> I am attaching a pdf file which shows some SC paddle info from g13a and g14 last target period.
>

thaink you, I will countercheck with my selection, and in case make 
changes following your note. The neutron analysis is just started, so most 
of the material is just a sort of "placeholder", but needs to be replaces 
with newer pictures.

> 
> (2) I think protons are misidentifies as neutrons, if
> 
>  (a) proton are detected in EC  and
> 
>  (b) either protons are not reconstructed in DC or not detected at SC
> 
> 
>  I guess that the number of events in which protons are passing through both DC and SC without
> 
> being detected is small.   But there are some as 9.4 % which are reconstructed in DC, but
> 
> not detected at SC bad paddles.

ok, let me check if this is consistent with what we (I and Lucilla) found. 
This part is far from being finished... say, it's halfway to completion.
Thank you for your observations,
cheers
     Alessandra


ps. by the way, I am afraid I won't be able to make it for next week's 
meeting due to an unforeseen committment. Would you all consider moving 
the g14 meeting to the week after? (of course, you can do without me, no 
problem in case)