[G8b_run] Newly cooked data

Wed Jun 26 14:51:38 EDT 2013

Ken,

I think that is a great idea.

Thanks :)

Take care,
Michael

On Wed, 26 Jun 2013, Ken Livingston wrote:

> Hi Micheal,
> Will talk to Dave, Bryan, and Eugene and Volker (who are both here for
> baryons2013). and organise a meeting for next week.
>
> Cheers,
> Ken
>
> On 25/06/13 15:28, Michael Dugger wrote:
>> Hi,
>>
>> For the pion channels I looked at the increase in statistics and found
>> that for
>> gamma p -> p pi0: Increase of 35%
>> gamma p -> n pi+: Increase of 240%
>>
>> This means that the reduction in the statistical part of the error bars
>> will be:
>>
>> pi0: Statistical error bar would be reduced by 14%
>>
>> pi+ n: Statistical error bar would be reduced by 35%
>>
>> Since the error bars I have for the pion channels are already quite small,
>> the increase in statistics will only help a handful of points.
>>
>> Plots of my pion results:
>>
>> pi0 ->
>> http://www.jlab.org/Hall-B/secure/g8b/ASU/tmp/tt01c-eps-converted-to.pdf
>>
>> pi+ n ->
>> http://www.jlab.org/Hall-B/secure/g8b/ASU/tmp/cc01c-eps-converted-to.pdf
>>
>> The g8b group need to reach a consensus as to whether the pion channel
>> should be analyzed with the newly cooked files. We have just finished the
>> Collaboration review stage and this will be a serious setback.
>>
>> We still don't have a full set of final stage data for g8b. My fear is
>> that we will have to wait a considerable amount of time to obtain the
>> final cooked data and then spend a month or more analyzing that data and
>> then go back through some part of the review process with the only
>> improvement being for a handful of points.
>>
>> Please let me know what your thoughts are regarding the pion channel
>> situation.
>>
>> Thanks for your time.
>>
>> Sincerely,
>> Michael
>>
>>
>> On Tue, 25 Jun 2013, Volker Crede wrote:
>>
>>> I had a look at the recooked run #048483.A01 (including all .B extensions; the old files only had B00 (otherwise we missed statistics before), the recooked files go from B00 to B03) and used the exact same analysis program as before. The increase in statistics for the two-pion channel (after all cuts) is impressive. I have not looked at any distributions, these are pure numbers. Here are the number of events that survive all cuts:
>>>
>>> Topology 1 (p pi+): 2191 (old) and 5213 (new) --  2.38
>>> Topology 2 (p pi-): 1441 (old) and 3130 (new) --  2.17
>>> Topology 3 (pi+ pi-): 1141 (old) and 3099 (new)  --  2.72
>>> Topology 4 (p pi+ pi-): 1288 (old) and 4648 (new)  --  3.61
>>>
>>> Cheers,
>>>
>>>      Volker
>>>
>>> Sent from my iPad
>>>
>>>
>>> On Jun 24, 2013, at 4:00 PM, Barry Ritchie <Barry.Ritchie at asu.edu> wrote:
>>>
>>>> Yes, it seems pretty likely, looking at the two pictures, that the additional cuts (said to be ngrf, tagrid, angle, momentum, vertex, and confidence level) have removed a large fraction of good events.
>>>>
>>>> Barry Ritchie
>>>> Vice Provost for Academic Personnel
>>>> Arizona State University
>>>> 300 E. University Ave, Suite 420
>>>> Tempe, AZ 85287-7805
>>>>
>>>> Phone: 480-965-7405
>>>> Fax: 480-965-0785
>>>>
>>>>
>>>> -----Original Message-----
>>>> From: g8b_run-bounces at jlab.org [mailto:g8b_run-bounces at jlab.org] On Behalf Of Michael Dugger
>>>> Sent: Monday, June 24, 2013 7:53 AM
>>>> To: Charles Hanretty
>>>> Cc: g8b
>>>> Subject: Re: [G8b_run] Newly cooked data
>>>>
>>>>
>>>> Charles,
>>>>
>>>> It looks like, after your cuts, you are left with about 19% of the original events. How does that compare with the previously cooked data?
>>>>
>>>> Take care,
>>>> Michael
>>>>
>>>>
>>>> On Mon, 24 Jun 2013, Charles Hanretty wrote:
>>>>
>>>>> Dear All,
>>>>>      Please find attached a set of beta v. momentum plots for gamma p
>>>>> -> p pip pim reactions using the newly cooked data
>>>>> (cooked_048483.A01.B02, the same file Mike used). The plot on the left
>>>>> is the beta v. momentum distribution for all final state particles (p,
>>>>> pip and pim) with no
>>>>> (notable) cuts; I only require a proton, pi+, pi- in the final state
>>>>> using the GPID bank. The plot on the left is the same plot after all
>>>>> of my cuts (ngrf, tagrid, angle, momentum, vertex, and confidence level).
>>>>>
>>>>>
>>>>> On Fri, Jun 21, 2013 at 1:31 PM, Michael Dugger <dugger at jlab.org> wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I was looking at some newly cooked data and am getting results for
>>>>>> beta vs. momentum that look strange.
>>>>>>
>>>>>> The plot for the newly cooked data ->
>>>>>> http://www.jlab.org/Hall-B/secure/g8b/ASU/tmp/NewBetaVsP.gif
>>>>>>
>>>>>> A plot of the previous version of cooked data ->
>>>>>> http://www.jlab.org/Hall-B/secure/g8b/ASU/tmp/OldBetaVsP.gif
>>>>>>
>>>>>> The plots are from PERP, 1.5 GeV, run 48483. The new plot only
>>>>>> contains events from file A01.B02, while the plot of the previous
>>>>>> cook has all A01 files.
>>>>>>
>>>>>> The resolution looks much better, but we now have and extra stripe
>>>>>> below the proton, and the stripe below the pions is crossing the
>>>>>> kaons more heavily.
>>>>>>
>>>>>> Is anyone else seeing this sort of behavior?
>>>>>>
>>>>>> Take care,
>>>>>> Michael
>>>>>>
>>>>>> _______________________________________________
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>>>>>> G8b_run at jlab.org
>>>>>> https://mailman.jlab.org/mailman/listinfo/g8b_run
>>>>>>
>>>>>
>>>>>
>>>>> --
>>>>> Cheers,
>>>>> Charles Hanretty
>>>>>
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>>>
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>
>
> -- 
> =======================================================
> Ken Livingston
>
> Dept. of Physics & Astronomy,        Tel: +44 141 330 6428
> University of Glasgow,               Fax: +44 141 330 5889
> Glasgow G12 8QQ.
> Scotland. UK.
> =======================================================
>
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