[Solid_ec] EC trigger update with photon block

[Zhiwen Zhao]

Hi, Yi

Sorry for the jagon used
"more1" mean baffle with 11 planes and 1 more degree than BaBar baffle.
refer to slide 2 of
http://hallaweb.jlab.org/12GeV/SoLID/download/baffle/talk/solid_baffle_zwzhao_20130829.pptx
"more1 block"

"more1 trig" mean the trig turn-on curve (slide 2) is obtained with the 
background produced by the "more1" baffle

Comparing slide 10 and 11 (I reordered the slide number), you will see 
the beyond 200cm, the rates for all particles have almost no change.
On slide 10 and 11, the solid line and upper box shows the untriggred 
rate, the dashed line and lower box show the trigger rate.
I guess you are looking at the rate drop before and after trigger?

Zhiwen

On 9/11/2013 12:31 AM, Yi Qiang wrote:
> Dear Zhiwen,
>
> Nice finding! The blocks also help a little bit in getting rid of pion
> background.
> Just a few questions. Can you remind me what are "more1" and "more1
> trigger" in your slides? Also, you put the photon blocks in between
> R=110 to 200 right in front of EC, So I do not expect much change in
> rates with R>200 in EC plane, but if we look at slide #10, I didn't see
> this behavior, on the contrary, I even found a hugh drop of photon rate
> beyond 190. Can you explain this, maybe I'm missing something.
>
> Cheers,
> Yi
> On 9/11/2013 12:04 AM, Zhiwen Zhao wrote:
>> Dear All
>>
>> I made an attempt to block photon before EC and saw the trigger rate
>> reduced by 2 because photon trigger rate is strongly suppressed.
>> see slides at
>> http://hallaweb.jlab.org/12GeV/SoLID/download/baffle/talk/solid_baffle_zwzhao_20130910.pptx
>>
>> http://hallaweb.jlab.org/12GeV/SoLID/download/baffle/talk/solid_baffle_zwzhao_20130910.pdf
>>
>>
>> I am working on checking the impact on Err_Apv and should have it by
>> the meeting tomorrow.
>>
>> Thanks
>>
>> Zhiwen
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>