[Clas_cascades] Meeting notes July 22

[Hovanes Egiyan]

Hi Zhiwen,

with the decay vertex analysis  the correction trigger inefficiency was 
~18%. The
acceptance reduction after the reconstructed vertex cuts was ~30%. But 
these cuts
affect the real data as well. These vertex cuts reduced the data sample 
by ~17%.
So, 0.83/0.70=0.18 .

For the study with the cuts on the raw ST hits  the cuts in the data are not
necessary since it happens on the trigger level. The ratio of the 
acceptances
gives the estimate of the triggering inefficiency, and it came out ~15%.

Hovanes.


On 07/23/2010 03:45 PM, Zhiwen Zhao wrote:
> Hi, Hovanes
>
> Sorry I missed the meeting.
> So if you look the raw ST hit, you have correction 15% and if you look the decay
> location, you have correction 30%,  are you gonna use both for final
> corrections? Don't those two conditions have some overlap?
>
> Zhiwen
>
> On 7/23/2010 10:52 AM, Hovanes Egiyan wrote:
>    
>> Present: Hovanes, Stepan, Kijun
>>
>> Notes by Hovanes.
>>
>>
>>      * Hovanes made an update on his estimates of trigger inefficiency due to the
>>        decay outside of the start counters
>>        <http://clasweb.jlab.org/rungroups/eg3/wiki/index.php/Trigger_efficiency_loss_estimates_due_to_detached_vertices_outside_ST_by_using_cuts_on_STN0_banks_in_the_acceptance_calculations>.
>>        This time he calculated the acceptance with cuts on raw ST hits.
>>
>>      * His studies show that ~15% of the MC events will not produce ST hits in
>>        three sectors to fire the bit 6 of the eg6 trigger. He also assigns 5%
>>        uncertainty to this estimate.
>>
>>      * Hovanes updated the response document and checked it in into CVS. He will
>>        add a subsection into the analysis note and post it for the group to
>>        review before sending it to the committee.
>>
>>
>>
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