[Clas_cascades] Fwd: Re: review of the "Search for Phi--(1862) Pentaquark State"
Elton Smith
elton at jlab.org
Mon Sep 20 14:54:12 EDT 2010
Thanks to Hovanes, Lewis, Kijun and Zhiwen for all the hard work in
putting both analyses notes together.
Thanks, Elton.
Elton Smith
Jefferson Lab MS 12H5
12000 Jefferson Ave
Suite # 16
Newport News, VA 23606
elton at jlab.org
(757) 269-7625
(757) 269-6331 fax
On Mon, 20 Sep 2010, Hovanes Egiyan wrote:
> Good news,
>
> the Φ−−(1862) analysis has been approved by the working group committee.
>
> Hovanes.
>
>
>
> -------- Original Message --------
> Subject: Re: review of the "Search for Phi--(1862) Pentaquark State"
> Date: Fri, 17 Sep 2010 15:28:48 -0400
> From: Angela Biselli <biselli at jlab.org>
> To: dgi at jlab.org
> CC: Valery Kubarovsky <vpk at jlab.org>, Carlos Salgado <salgado at jlab.org>,
> Pasyuk Eugene <pasyuk at jlab.org>, Hovanes Egiyan <hovanes.egiyan at gmail.com>
>
>
>
> Dear David,
> the committee, composed of Valery Kubarovsky, Carlos Salgado and
> myself (Chair) was charged with reviewing "Upper Limits for the
> Photoproduction Cross Section for the Φ−−(1862) Pentaquark State in
> Ξ−π− Decay
> Channel Using EG3 Data" analysis.
> After reviewing the latest version of the analysis note, the supporting note
> for the normalization studies and the answers to the third round comments,
> the committee is completely satisfied with Hovanes (and co-authors) response.
> In our opinion the analysis is well done, well presented and ready to proceed
> to the Ad Hoc committee.
>
> We would like to thank the authors for their patience in this lengthy review
> process and congratulate them for the good work.
> I also would like to personally thank Valery and Carlos for their excellent
> work in this review.
>
> Best regards
>
> Angela
>
>
>
> On Aug 16, 2010, at 1:48 PM, Hovanes Egiyan wrote:
>
>> Dear members of the Committee,
>>
>> We incorporated your comments and we believe that we have answers to the
>> questions
>> from the third round of the review. The main changes are:
>>
>> o Corrections due to decays in the start counter for the main Phi--
>> analysis and uncertainty associated with it.
>> o Corrections for 2ns tagger timing cut in the normalization study
>> o Corrections for multiple hits in the tagger hits in the normalization
>> study
>>
>> Both the main paper and the normalization study significantly improved
>> after this round.
>> As the uncertainties increased, so did the upper limit which is now stands
>> at approximately 700pb.
>> I posted our responses to the comments and new versions of the main
>> analysis note and the supplemental note on
>> normalization at our wiki page:
>>
>> http://clasweb.jlab.org/rungroups/eg3/wiki/index.php/Analysis_review_by_Hadron_Spectroscopy_Working_Group.#Third_Round
>>
>> We appreciate your patience and cooperation, and we hope these responses
>> answer the issues raised by the committee.
>> We are working on the draft of the full paper and we will send it to you
>> when it is reasonably good shape.
>>
>> Best regards,
>> Hovanes.
>>
>>
>>
>>
>> Angela Biselli wrote:
>>> Dear Hovanes,
>>> please find attached the second round of comments for the latest version
>>> of the analysis note. The committee found the analysis and the analysis
>>> note greatly improved. We believe this work is ready for publication,
>>> pending the answers to the comments below. We are looking forward to hear
>>> back from you and we will do our best to give you a prompt answer so that
>>> you can proceed with the Ad Hoc committee as soon as possible.
>>>
>>> Best regards
>>>
>>> Angela
>>>
>>>
>>>
>>>
>>> On Dec 16, 2009, at 2:13 PM, Hovanes Egiyan wrote:
>>>
>>>> Dear members of the review committee,
>>>>
>>>> Thank you very much for your patience with this analysis.
>>>> Our group completed the normalization checks mostly done by Lewis Graham
>>>> from University of South Carolina. The result show that we do understand
>>>> eg3
>>>> normalization within 10%. Here is a short list of main modifications
>>>> from the very
>>>> first version of the analysis note:
>>>>
>>>>
>>>> o Normalization studies showed that there is trigger inefficiency in
>>>> the eg3 data most likely
>>>> due to the start counter. The start counter in eg3 trigger was in two
>>>> stages: one in Level 1 in
>>>> sector-based coincidence with TOF; and second, in the asynchronous input
>>>> to the trigger
>>>> supervisor in coincidence with tagger MOR (mostly for runs after
>>>> Christmas).
>>>> Correction functions were developed and applied to the data to get
>>>> proper normalization for
>>>> the cross sections.
>>>>
>>>> o A comparison of eg3 cross sections for (gamma d --> Delta++ pi- n)
>>>> channel to the g11 cross sections
>>>> for (gamma p --> Delta++ pi-) channel shows a good agreement. Both data
>>>> sets are in agreement with
>>>> the SAPHIR data.
>>>>
>>>> o A problem was identified by the committee in the comparison of the
>>>> acceptances with different
>>>> event generators. We traced it to the way the acceptance was calculated
>>>> for the events from
>>>> (Xi- pi- K+ K+) phase space configuration. This issue has been resolved
>>>> now, the two event
>>>> generator models (row 1 and row 4 in Table 6 in the new note) give
>>>> consistent results.
>>>> o The committee pointed out that the timing cut between the CLAS and the
>>>> tagger was
>>>> too narrow. We significantly increased the cut window (by a factor of
>>>> 4) to 3.2ns.
>>>>
>>>> o The timing cuts for selecting the Lambda-candidates has been modified.
>>>>
>>>> o The "c tau" cuts were practically removed from the part of the
>>>> analysis where the
>>>> upper cross sections were calculated, because GSIM does not seem to
>>>> reproduce these
>>>> distributions in a reliable manner.
>>>>
>>>> o The committee found that the trigger configuration actually used
>>>> during the data
>>>> acquisition was different than what was requested. The 3-sector trigger
>>>> was a requirement of 3 sectors with TOFxST coincidences. The other part
>>>> with 2
>>>> sectors but 3 start counters was dropped from the trigger file. The
>>>> current analysis
>>>> takes this into account.
>>>>
>>>> You can find the detailed answers to the comments and the new version of
>>>> out analysis
>>>> note at our wiki page at :
>>>> http://clasweb.jlab.org/rungroups/eg3/wiki/index.php/Analysis_review_by_Hadron_Spectroscopy_Working_Group
>>>>
>>>> Best regards,
>>>> Hovanes.
>>>>
>>>
>>>
>>>
>>> Angela Biselli
>>> Assistant Professor
>>> Physics Department
>>> Fairfield Universiy
>>> 1073 North Benson Rd
>>> Fairfield CT 06824
>>> 203-254-4000 ext 2192
>>>
>>>
>>>
>
>
>
> Angela Biselli
> Associate Professor
> Physics Department
> Fairfield University
> 1073 North Benson Rd
> Fairfield CT 06824
> 203-254-4000 ext 2192
>
>
>
>
>
>
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