[Halld-physics] Physics Working Group Meeting: Tuesday, October 16 @ 11:15 am
Elton Smith
elton at jlab.org
Tue Oct 23 10:06:08 EDT 2018
Hi Justin,
For reference below are some CLAS references on 2pi production and rho
and omega-meson production at large momentum transfer. Cheers, Elton.
@article{PhysRevD.80.072005,
title = {Photoproduction of
${\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ meson pairs
on the proton},
author = {Battaglieri, M. and others},
collaboration = {CLAS Collaboration},
journal = {Phys. Rev. D},
volume = {80},
issue = {7},
pages = {072005},
numpages = {19},
year = {2009},
month = {Oct},
publisher = {American Physical Society},
doi = {10.1103/PhysRevD.80.072005},
url = {https://link.aps.org/doi/10.1103/PhysRevD.80.072005}
}
@article{PhysRevLett.90.022002,
title = {Photoproduction of the $\ensuremath{\omega}$ Meson on the
Proton at Large Momentum Transfer},
author = {Battaglieri, M. and others},
collaboration = {CLAS Collaboration},
journal = {Phys. Rev. Lett.},
volume = {90},
issue = {2},
pages = {022002},
numpages = {5},
year = {2003},
month = {Jan},
publisher = {American Physical Society},
doi = {10.1103/PhysRevLett.90.022002},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.90.022002}
}
@article{PhysRevLett.87.172002,
title = {Photoproduction of the ${\ensuremath{\rho}}^{0}$ Meson on
the Proton at Large Momentum Transfer},
author = {Battaglieri, M. and others},
collaboration = {CLAS Collaboration},
journal = {Phys. Rev. Lett.},
volume = {87},
issue = {17},
pages = {172002},
numpages = {5},
year = {2001},
month = {Oct},
publisher = {American Physical Society},
doi = {10.1103/PhysRevLett.87.172002},
url = {https://link.aps.org/doi/10.1103/PhysRevLett.87.172002}
}
Elton Smith
Jefferson Lab MS 12H3
12000 Jefferson Ave STE 4
Newport News, VA 23606
(757)269-7625
(757)269-6331 fax
On 10/23/18 9:36 AM, Igor Strakovsky wrote:
> Cool. Then, please adjust this plan accordingly. I can provide CLAS
> g1c ds/dO as I did for
> g12. Please let me know
>
> Cheers, 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 <mailto:igor at gwu.edu>,
> igor at jlab.org <mailto:igor at jlab.org>
>
>
> On Tue, Oct 23, 2018 at 9:27 AM Justin Stevens <jrsteven at jlab.org
> <mailto:jrsteven at jlab.org>> wrote:
>
> The minimum Eg is 25% of the endpoint energy, which is fixed by
> the tagger field and TAGH counter geometry. So the minimum Eg for
> these runs would be ~2.9 GeV.
> -Justin
>
>> On Oct 23, 2018, at 9:22 AM, Igor Strakovsky <igor at gwu.edu
>> <mailto:igor at gwu.edu>> wrote:
>>
>> Hi Justin,
>>
>> Plan looks great. I have two small comments
>>
>> - The min Eg is still unclear. So, if one can possible to go a
>> little bit below 3 GeV then CLAS
>> g1c data for pi0 is reachable [DUGGER, PRC76, 025211(2007)]: Eg
>> = 2875, 2825, 2775 and so on
>>
>> - I would not use previous measuremen
>> <https://halldweb.jlab.org/DocDB/0008/000809/002/GlueX_doc_809.pdf>as the
>> source to compare with because most of data
>> came from brem Bonn measurements which systematics is out the
>> control.
>>
>> Cheers, 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 <mailto:igor at gwu.edu>,
>> igor at jlab.org <mailto:igor at jlab.org>
>>
>>
>> On Tue, Oct 23, 2018 at 7:54 AM Justin Stevens <jrsteven at jlab.org
>> <mailto:jrsteven at jlab.org>> wrote:
>>
>> Hi Igor, All,
>>
>> Yes, as we discussed at the Physics WG meeting last week,
>> there are 2 possibilities for low energy measurements which
>> correspond to your bullets below. The priority was given to
>> proposing a run plan for this Fall, since time is limited.
>> Thanks to Sean for collecting the relevant data and rate
>> estimates for this Fall’s proposal at
>> https://halldweb.jlab.org/wiki-private/index.php/2018_Low_energy_measurements.
>> The short summary is that we would like to propose a ~5 day
>> run with a lower PS field setting to give statistical errors
>> <10% on cross sections for comparison to previous
>> measurements, and this is on the agenda for today’s bi-weekly
>> meeting.
>>
>> This Fall’s proposal of course does not preclude running in
>> Summer 2019, but would give us some data in the short term to
>> compare with previously measured cross sections. To make a
>> decision on Summer 2019 running, we would need a similar
>> proposal with the stated goals, rate estimates, and required
>> running time.
>>
>> -Justin
>>
>>> On Oct 17, 2018, at 4:34 PM, Igor Strakovsky <igor at gwu.edu
>>> <mailto:igor at gwu.edu>> wrote:
>>>
>>> Hi Justin,
>>>
>>> According to my understanding there are two different run
>>> periods
>>>
>>> - this fall which will allow to cover 4-9 GeV or so. CLAS6
>>> does not have pol measurements
>>>
>>> - next summer which is a low energy run which you spelled
>>> out. that is different story
>>>
>>> Cheers, igor
>>>
>>>
>>> On Wed, Oct 17, 2018 at 1:15 PM Justin Stevens
>>> <jrsteven at jlab.org <mailto:jrsteven at jlab.org>> wrote:
>>>
>>> Hi Igor,
>>>
>>> Thanks for your feedback. My understanding is the
>>> accelerator would run at half energy (Ee ~ 5.5 GeV), and
>>> as usual we could choose to set the coherent peak as we
>>> prefer. The hodoscope in this case would cover Eg ~ 1.5
>>> GeV to the endpoint, although it will still be only half
>>> instrumented (sampling) between 1.5 and 3.5 GeV. So
>>> data below Eg = 4 GeV could be possible in this
>>> scenario, but at a lower efficiency.
>>>
>>> -Justin
>>>
>>>> On Oct 15, 2018, at 3:11 PM, Igor Strakovsky
>>>> <igor at gwu.edu <mailto:igor at gwu.edu>> wrote:
>>>>
>>>> Hi Justin,
>>>>
>>>> It would be good to spell out a possible Eg range and
>>>> our goals for summer of 2019. Then all depends.
>>>>
>>>> I reported twice that if our range is limited by 4 - 6
>>>> GeV and our main goal is diff cross sections then
>>>> g12 from CLAS6 will work for us. There are no CLAS pol
>>>> measurements in this case. So, we have
>>>> gp-->pi0p cross sections published several month ago
>>>> and Volker's analyses for gp-->etap and
>>>> gp-->omegap are under the HW group review now.
>>>>
>>>> If one can possible to go below 3 GeV then we will have
>>>> more options including polarized
>>>> measurements. Additional benefit will come from the
>>>> ability to use the PWA technology to evaluate
>>>> new data and possibility to provide "good" event
>>>> generators for MC. See my slides at DB
>>>>
>>>> Cheers, 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
>>>> <mailto:igor at gwu.edu>, igor at jlab.org <mailto:igor at jlab.org>
>>>>
>>>>
>>>> On Mon, Oct 15, 2018 at 12:50 PM Justin Stevens
>>>> <jrsteven at jlab.org <mailto:jrsteven at jlab.org>> wrote:
>>>>
>>>> Hi All,
>>>>
>>>> There’s been a proposal to have a short discussion
>>>> about a potential low-energy run in Summer 2019
>>>> during tomorrow’s physics meeting. To frame the
>>>> discussion: the accelerator plans to run at ~half
>>>> energy during June/July 2018 and GlueX could
>>>> potentially run parasitically during this period.
>>>>
>>>> We had some discussion about the potential
>>>> usefulness of low-energy running earlier this year
>>>> (comparison to cross section measurements from
>>>> CLAS, energy-dependence of polarization
>>>> observables, etc.), but that was in a different
>>>> context of using the full energy electron beam with
>>>> lower coherent peak settings (see
>>>> https://halldweb.jlab.org/wiki-private/index.php/Aug_7,_2018,_Physics_Working_Group).
>>>>
>>>> If you have something you would like to contribute
>>>> to the discussion, please let me know.
>>>>
>>>> -Justin
>>>>
>>>>> On Oct 14, 2018, at 1:46 PM, Justin Stevens
>>>>> <jrsteven at jlab.org <mailto:jrsteven at jlab.org>> wrote:
>>>>>
>>>>> Hi All,
>>>>>
>>>>> Our next Physics WG meeting we be Tuesday, October
>>>>> 16 at 11:15 am,
>>>>> https://halldweb.jlab.org/wiki-private/index.php/Oct_16,_2018,_Physics_Working_Group.
>>>>> Please let me know if you have something you would
>>>>> like to present.
>>>>>
>>>>> -Justin
>>>>> _______________________________________________
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>>>>
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>>>
>>
>
>
>
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