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

[nicholas]

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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