<div dir="ltr">Hi <span style="font-size:14px">Ilya,</span><div><span style="font-size:14px">sorry it should be </span><span style="font-size:14px">acceptance = yield / input ; </span></div><div><span style="font-size:14px">&y = aqrt(yield) / yield about aqrt(10000)/10000 = 1/100 ;</span></div><div><span style="font-size:14px">&input : aqrt(60000)/60000 = 1/245 ; </span></div><div><span style="font-size:14px">so stat. error = acc* aqrt( 1/100^2 + 1/245^2) = 0.2% </span></div><div><span style="font-size:14px">so the stat. error can not be that much jump </span></div><div><span style="font-size:14px">may be I use the wrong mc file , I will re-run the simulation file to make sure no error files and discuss with you tomorrow .</span></div><div><span style="font-size:14px">Thanks</span></div><div><span style="font-size:14px">Li</span></div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-02-15 20:21 GMT-05:00 Ilia Larin <span dir="ltr"><<a href="mailto:ilarin@jlab.org" target="_blank">ilarin@jlab.org</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Hi Li,<br>
<br>
I think I don't completely understand what means<br>
"acceptance = input number / yield",<br>
and acceptance function on the plot does not necessarily<br>
look wrong - depends on stat. errors.<br>
<br>
Ilya<br>
<br>
ps: yes, sure we can discuss tomorrow.<br>
<span class="im HOEnZb"><br>
<br>
----- Original Message -----<br>
From: "li ye" <<a href="mailto:yeli.ciae@gmail.com">yeli.ciae@gmail.com</a>><br>
To: "ganl" <<a href="mailto:ganl@uncw.edu">ganl@uncw.edu</a>><br>
</span><div class="HOEnZb"><div class="h5">Cc: "Ilya Larin" <<a href="mailto:ilarin@jlab.org">ilarin@jlab.org</a>>, "pawel" <<a href="mailto:pawel@jlab.org">pawel@jlab.org</a>>, "primex2" <<a href="mailto:primex2@jlab.org">primex2@jlab.org</a>><br>
Sent: Monday, February 15, 2016 8:08:53 PM<br>
Subject: Re: Compton result from Li<br>
<br>
Hi Ilia,<br>
<br>
here I attached flux plot and MCinput plot , they looks like same shape<br>
that's why I assume the MC input number should proportional to the flux,<br>
of course the final cross section has nothing to do with this input, only<br>
depend on the acceptance and the yield .<br>
if you make the input number has some random variation , that also<br>
make sense, I just want to make sure what you did in the simulation.<br>
but either way , I must have the smooth acceptance right ?<br>
I plot the acceptance , which = input number / yield , here the yield is<br>
what I got from reconstructed simulation result , without any cut .<br>
but the acceptance still look not right .<br>
may be we can talk more face to face . are you available tomorrow ?<br>
Thanks<br>
Li<br>
<br>
2016-02-15 17:22 GMT-05:00 li ye <<a href="mailto:yeli.ciae@gmail.com">yeli.ciae@gmail.com</a>>:<br>
<br>
> Hi Ilia,<br>
> regarding your questions:<br>
> 1) the vertical axis is the input events number / data flux* 10e9<br>
> 2) 10 combined Echannel is one energy bin first bin (4.4Gev) is for<br>
> Echannel 170- 180<br>
> 3) MC input is the generated events number which put in the simulation<br>
> for each Echannel , not reconstructed number<br>
> 4) I will show you more plot later<br>
> 5) flux means data flux<br>
><br>
> Cheers<br>
><br>
><br>
> 2016-02-16 6:11 GMT+08:00 Gan, Liping <<a href="mailto:ganl@uncw.edu">ganl@uncw.edu</a>>:<br>
><br>
>> Hi, Li,<br>
>><br>
>> Would you please answer Ilya's questions?<br>
>><br>
>> Liping<br>
>><br>
>> -----Original Message-----<br>
>> From: Ilia Larin [mailto:<a href="mailto:ilarin@jlab.org">ilarin@jlab.org</a>]<br>
>> Sent: Monday, February 15, 2016 4:04 PM<br>
>> To: Gan, Liping<br>
>> Cc: li ye; pawel; primex2<br>
>> Subject: Re: Compton result from Li<br>
>><br>
>><br>
>> I Liping,<br>
>> I thing I need to clarify some details about page 17 bottom plot, so I<br>
>> can look at MC:<br>
>><br>
>> 1) what are the units on vertical axis?<br>
>> 2) what is exact energy bin definition?<br>
>> 3) "the Monte Carlo event number" means generated or reconstructed<br>
>> number?<br>
>> 4) if he checked the photon flux distribution - why not show it as well<br>
>> on the presentation<br>
>> 5) flux in denominator means data flux, not mc flux<br>
>><br>
>> Ilya<br>
>><br>
>><br>
>><br>
>> ----- Исходное сообщение -----<br>
>> От: "ganl" <<a href="mailto:ganl@uncw.edu">ganl@uncw.edu</a>><br>
>> Кому: "Ilya Larin" <<a href="mailto:ilarin@jlab.org">ilarin@jlab.org</a>><br>
>> Копия: "li ye" <<a href="mailto:yeli.ciae@gmail.com">yeli.ciae@gmail.com</a>>, "pawel" <<a href="mailto:pawel@jlab.org">pawel@jlab.org</a>>,<br>
>> "primex2" <<a href="mailto:primex2@jlab.org">primex2@jlab.org</a>><br>
>> Отправленные: Понедельник, 15 Февраль 2016 г 15:28:59<br>
>> Тема: RE: Compton result from Li<br>
>><br>
>> HI, Ilya,<br>
>><br>
>> Please look at page 17 in his presentation. The top figure shows the<br>
>> extracted cross section and the bottom figure shows the ratio of the Monte<br>
>> Carlo event number per energy bin over the photon flux. Both<br>
>> distributions have quite similar shapes. On the other hand, one should<br>
>> expect the bottom distribution should only be related to the experimental<br>
>> photon flux and Monte Carlo Compton sample, and it has nothing to do with<br>
>> actually experimental Compton production. He said that he checked the photo<br>
>> flux distribution and found relatively smooth distribution. Therefore he<br>
>> conclude that the fluctuation in the figures on the page 17 might be caused<br>
>> by the Monte Carlo sample.<br>
>><br>
>> Liping<br>
>><br>
>> -----Original Message-----<br>
>> From: Ilia Larin [mailto:<a href="mailto:ilarin@jlab.org">ilarin@jlab.org</a>]<br>
>> Sent: Monday, February 15, 2016 3:11 PM<br>
>> To: Gan, Liping<br>
>> Cc: li ye; pawel; primex2<br>
>> Subject: Re: Compton result from Li<br>
>><br>
>><br>
>> Hi Liping,<br>
>> There's no comments on his slides,<br>
>> what MC issue did he demonstrate?<br>
>> Ilya<br>
>><br>
>><br>
>> ----- Исходное сообщение -----<br>
>> От: "ganl" <<a href="mailto:ganl@uncw.edu">ganl@uncw.edu</a>><br>
>> Кому: "li ye" <<a href="mailto:yeli.ciae@gmail.com">yeli.ciae@gmail.com</a>>, "pawel" <<a href="mailto:pawel@jlab.org">pawel@jlab.org</a>>, "Ilya<br>
>> Larin" <<a href="mailto:ilarin@jlab.org">ilarin@jlab.org</a>><br>
>> Копия: "primex2" <<a href="mailto:primex2@jlab.org">primex2@jlab.org</a>><br>
>> Отправленные: Понедельник, 15 Февраль 2016 г 14:51:28<br>
>> Тема: RE: Compton result from Li<br>
>><br>
>> Hi, Pawel and Ilya,<br>
>><br>
>> Li demonstrated in his presentation on last Friday that the fluctuation<br>
>> in his extracted Compton cross section might be caused by MC simulation<br>
>> sample. I think that it is very important. Would you please take a close<br>
>> look at his presentation? I would suggest to investigate the MC simulation<br>
>> as soon as possible.<br>
>><br>
>> Cheers,<br>
>> Liping<br>
>><br>
>><br>
>><br>
>> From: Primex2 [mailto:<a href="mailto:primex2-bounces@jlab.org">primex2-bounces@jlab.org</a>] On Behalf Of li ye<br>
>> Sent: Friday, February 12, 2016 3:03 PM<br>
>> To: Yang Zhang<br>
>> Cc: <a href="mailto:primex2@jlab.org">primex2@jlab.org</a><br>
>> Subject: Re: [Primex2] PrimEx-II analysis meeting reminder<br>
>><br>
>> Hi powel , Ilia ,<br>
>> Please take a look the slides I have for todays meeting .<br>
>> I use the Tfraction fitter to fit the data and get the cross section<br>
>> result, the fitting is much better , but I still have some jump for the<br>
>> cross section , so I checked the calculation all over again and found a<br>
>> problem.<br>
>><br>
>> in the simulation in my understanding ,the N-input for each Echannel<br>
>> should be like :<br>
>> cross-theory = Yield-mc / (const * flux * Acc ) where const is<br>
>> constant from target information , Acc is acceptance = Yield-mc /<br>
>> N-input ,<br>
>> so cross-theory = Yield-mc *(N-input/Yield-mc) /(const*flux)<br>
>> cross-theory = N-input /(const*flux)<br>
>> N-input = const*flux*cross-theory<br>
>><br>
>> means N-input should proportional to the cross-theory but if you check<br>
>> the last slides plot , the N-input number I got looks not right behavior .<br>
>> Please correct me if i am wrong .<br>
>> Yang , would you please also check the simulation input / flux for pi0 ?<br>
>> see if it is mach the theory shape ?<br>
>><br>
>> Cheers<br>
>> Li<br>
>><br>
>> 2016-02-11 22:18 GMT-05:00 Yang Zhang <<a href="mailto:yzhang132@gmail.com">yzhang132@gmail.com</a><mailto:<br>
>> <a href="mailto:yzhang132@gmail.com">yzhang132@gmail.com</a>>>:<br>
>> Dear collaborators,<br>
>><br>
>> We'll have our weekly meeting on February 12th, this Friday afternoon at<br>
>> 1:30pm in F227.<br>
>><br>
>> please log onto <a href="https://jlab.bluejeans.com/2265619819/" rel="noreferrer" target="_blank">https://jlab.bluejeans.com/2265619819/</a> to view the<br>
>> sharing. And Make sure your microphone and speaker are ok before entering<br>
>> our meeting.<br>
>><br>
>> You can also dial phone number <a href="tel:%2B1%20888-240-2560" value="+18882402560">+1 888-240-2560</a><tel:+1%20888-240-2560> to<br>
>> join the meeting with meeting ID <a href="tel:2265619819" value="+12265619819">2265619819</a><tel:<a href="tel:2265619819" value="+12265619819">2265619819</a>>.<br>
>><br>
>> Meeting webpage:<br>
>> <a href="http://wwwold.jlab.org/primex/weekly_meetings/primexII/slides_2016_02_12" rel="noreferrer" target="_blank">http://wwwold.jlab.org/primex/weekly_meetings/primexII/slides_2016_02_12</a><br>
>><br>
>> Directory for your presentation files:<br>
>> /group/primex/html/weekly_meetings/primexII/slides_2016_02_12<br>
>> Best<br>
>> Yang<br>
>><br>
>> _______________________________________________<br>
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>> <a href="mailto:Primex2@jlab.org">Primex2@jlab.org</a><mailto:<a href="mailto:Primex2@jlab.org">Primex2@jlab.org</a>><br>
>> <a href="https://mailman.jlab.org/mailman/listinfo/primex2" rel="noreferrer" target="_blank">https://mailman.jlab.org/mailman/listinfo/primex2</a><br>
>><br>
><br>
><br>
</div></div></blockquote></div><br></div>