[Clas_cascades] pentaquark search with pK0Km skim

[Zhiwen Zhao]

hi, Igor

The statistics won't allow me to study FSI, so I plan to cut on quasi free 
reaction by limiting missing momentum later on.
I didn't know you are doing Lambda1502 in HallA. That's GREAT news.
Can you show me some notes or talks you already have?

Thank you

Zhiwen

On 2/17/2010 9:04 PM, Igor Strakovsky wrote:
> Hi Zhiwen,
>
> On Wed, 17 Feb 2010 16:56:21 -0500, Zhiwen Zhao <zwzhao at jlab.org> wrote:
>
>> Hi,Igor
>>
>> On 2/14/2010 12:45 PM, Igor Strakovsky wrote:
>>> Hi Zhiwen,
>>>
>>> Thank you for your prompt reaction. I would afraid to make a claim until
>>> to get strong arguments. It sounds that you do not have them yet
>> Exactly, I am not making any claim
>>>
>>> A little bit more below
>>>
>>> On Sat, 13 Feb 2010 22:28:40 -0500, Zhiwen Zhao <zwzhao at jlab.org> wrote:
>>>
>>>> Hi, Igor
>>>>
>>>> No, I am not sure at this point as the result is just a first look
>>>> into the data, not even qualified as preliminary.
>>>> However these cuts I showed are supposed either to enhance the theta+
>>>> signal or to match LEPS condition.
>>>
>>> As your slides shown that you did not do exact LEPS condition
>> For angle, LEPS has horizontal 20 degree and vertical 10 degree
>> coverage. So far I require theta < 20 degree and it's only for Km, not
>> for all charged particles like LEPS. I will test more cuts.
>> For photon energy, my cut matches their condition 2-2.4GeV
>
> Well, as I said your condition does not fit LEPS configuration well;)
>
>>>> I have looked their Anti-cuts also, no sign of theta+ either.
>>>> Some cuts I didn't show such as photon selection,PID, fiducial,
>>>> vertex, sc dad counter etc, are mostly standard and similar to what
>>>> Hovanes used in his
>>>
>>> As far as you probably know, CLAS has so many standards. It is good to
>>> clarify them
>> Some cuts you can see from Hovanes's analysis note
>> http://clasweb.jlab.org/rungroups/eg3/wiki/index.php/Analysis_review_by_Hadron_Spectroscopy_Working_Group
>>
>> I am in the process of writing Lambda1520 note also.
>>>
>>>> eg3 pentaquark Phi-- upper limit analysis which is currently under
>>>> review.
>>>> The same PK0Km channel is used for Lambda1520 study which is my thesis
>>>> topic, I have preliminary cross section now.
>>>
>>> Sorry, I know nothing about your theses and would love to see your
>>> Lambda(1520). Unfortunately, the size of your figures do not allow
>>> to see details
>> Here's a talk I gave for Lambda1520
>> http://clasweb.jlab.org/rungroups/eg3/wiki/images
>> /5/52/ApsApril2010_zwzhao_Lambda1520.pdf
>> I apologize for the figures, I will update them with better ones.
>
> Thank you for your figures, I missed them. It seems to me that our coming
> paper addressed to the analysis of the Hall A Lambda(1520)
> electroproduction
> data at small Q2 may be interesting for you. I hope we will submit it in
> 2-3 weeks.
>
> To be honest, your analysis of the neutron data is a big problem for me
> because you did not take into account FSI
>
>>>> I have MC for the Lambda1520 production, but not PK0Km yet.
>>>
>>> Can you show them, please? What did you use as the generator
>> will do.
>> I use fsgen which is a phase space generator with t-slope=2 as input
>> for my Lambda1520 channel.
>
> OK, thanks. Igor
>
>>>> I will add more stuff on the wiki when the analysis proceeds.
>>>> Any comment from you is greatly appreciated.
>>>
>>> Thanks, I look forward to learn more details from you
>>> Igor
>>>
>>>> Zhiwen
>>>>
>>>>
>>>> On 2/12/2010 1:14 AM, Igor Strakovsky wrote:
>>>>> Hi Zhiwen,
>>>>>
>>>>> How are so sure? You made so many cuts... Can you explain all of them?
>>>>> Can you show any well known resonances? Do you have MC?
>>>>>
>>>>> Igor
>>>>>
>>>>> On Fri, 12 Feb 2010 01:04:37 -0500, Zhiwen Zhao <zwzhao at jlab.org>
>>>>> wrote:
>>>>>
>>>>>> hi, Eg3er
>>>>>>
>>>>>> Here is some updates of the pentaquark search with pK0Km skim
>>>>>> http://clasweb.jlab.org/rungroups/eg3/wiki/index.php/PrtK0Km_theta1530
>>>>>>
>>>>>> So far, there's no sign of pentaquark.
>>>>>> Any commend is appreciated.
>>>>>>
>>>>>> Zhiwen