[Clas12_verystrange] [EXTERNAL] Re: Posted Alan's presentation and main page of wiki

[Michael Dugger]

Thanks for the clarification.

I hope that I did not come off as being too negative regarding Mathew's
efforts. There is nothing wrong with employing some pid cuts and I think
Mathew is showing nice results that he can be proud of. I just wanted to
make sure that we were not taking a NIM paper as the final authority on
pid cuts.

Take care,
Michael

> Hi Michael,
>
> The initial motivation on the kaon momentum cut was to obtain as clear
> sample as possible; this dated back to when we couldnt see any hyperon
> signal. I agree that this can be now tailored to the data better. Having
> additional requirements, (invariant mass cuts and missing-mass cuts)
> reduce the necessity of this cut and we should be able to do without it. I
> dont think we should put much emphasis on this cut, other than a simple
> quick way to obtain a cleaner sample on kaons. As soon as we know more
> about the dataset and how things look we will start to look for ways to
> optimise our data sample (which would most likely mean removal of this
> cut).
>
> -N
>
>> On 20 May 2020, at 12:44, Michael Dugger <dugger at jlab.org> wrote:
>>
>> Mathew,
>>
>> With kaons there is always some level of misidentification that we have
>> to
>> learn to deal with. It will be good to perform studies of kaon purity
>> versus different cuts on kinematic variables. Just saying "good particle
>> purity" is rather meaningless.
>>
>> The article you post as evidence for your cuts is 18 pages and you give
>> no
>> indication where the relevant information is! Are we all to read the
>> entire article?
>>
>> It would be good for you to give a short summary regarding the relevant
>> information in the paper, or at the very least, give us some page
>> numbers
>> where that information can be found. Asking everyone to sift through an
>> 18
>> page NIM article is not very helpful.
>>
>> Also, a NIM article on the TOF system can be a good place to start
>> talking
>> about kinematic cuts, but that can not be the final word. It is
>> precisely
>> this stage of the analysis where analysis cuts should be explored.
>>
>> Take care,
>> Michael
>>
>>> Hello,
>>> I have also added my slides from yesterday. I have also added a link to
>>> the
>>> FTOF technical specification which gives suggestions for momentum cuts
>>> for
>>> good particle purity, FTOF can detect higher than these momenta but it
>>> can
>>> lead to misidentification.
>>> Matthew
>>>
>>> On Tue, 19 May 2020 at 23:27, Michael Dugger <dugger at jlab.org> wrote:
>>>
>>>> Hi,
>>>>
>>>> I put the link on the wiki. It is at the same location as Alan's
>>>> presentation:
>>>>
>>>> https://clasweb.jlab.org/wiki/index.php/May_19th,_2020
>>>>
>>>> ( clasweb.jlab.org/wiki/index.php/May_19th,_2020 )
>>>>
>>>> Take care,
>>>> Michael
>>>>
>>>>> Mike,
>>>>>
>>>>> Can you please add Viktor's fresh paper which illustrates Eugene's
>>>> idea
>>>>> that EPR is a good tool
>>>>> to look for missing resonances vs PR.  In Viktor's case, the
>>>> non-resonance
>>>>> background has a
>>>>> strong Q2 dependence and vanishing at high Q2.  I sent my message to
>>>> the
>>>>> VS
>>>>> group but it
>>>>> is waiting for the moderator
>>>>>
>>>>> Thanks, igor
>>>>>
>>>>> -----
>>>>> Igor Strakovsky, SAID INS The George Washington University
>>>>> Tel: 571-553-8344(VC),202-994-4742(FB),Skype: igors1945_2,
>>>>> Cell: 703-728-5627,Emails: igor at gwu.edu, igor at jlab.org
>>>>>
>>>>>
>>>>> On Tue, May 19, 2020 at 5:31 PM Michael Dugger <dugger at jlab.org>
>>>> wrote:
>>>>>
>>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> As a reminder, the main page of the Very Strange wiki is at
>>>>>>
>>>>>> https://clasweb.jlab.org/wiki/index.php/Very_Strange_Experiment
>>>>>>
>>>>>> ( clasweb.jlab.org/wiki/index.php/Very_Strange_Experiment )
>>>>>>
>>>>>> This would be a good location to put information about the energy
>>>>>> corrections.
>>>>>>
>>>>>> You can find a pdf of Alan's presentation at
>>>>>>
>>>>>> https://clasweb.jlab.org/wiki/index.php/May_19th,_2020
>>>>>>
>>>>>> ( clasweb.jlab.org/wiki/index.php/May_19th,_2020 )
>>>>>>
>>>>>> Take care,
>>>>>> Michael
>>>>>>
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