Hi Richard,
I have extracted A_TT' and A_TL' (no radiative corrections yet).
I still have problems with MC simulations in order to get the same
asymmetries and correlation parameters.
I will talk to Peter and let him know what I have so far.
-----------------------
Octavian F Filoti
Nuclear Physics Group
Univ. of New Hampshire
9 Library Way
Durham, NH 03824
phone: (603)862-1220
FAX: (603)862-2998
email: ofiloti@unh.edu
On Wed, 9 Feb 2005, Richard G Milner wrote:
> Dear colleagues,
> Peter Bosted is interested in BLAST data to extract g1 and g2 at low Q2.
> Please find correspondence attached.
> regards,
> Richard
>
> ---------- Forwarded message ----------
> Date: Tue, 8 Feb 2005 16:36:38 -0500 (EST)
> From: Peter Bosted <bosted@jlab.org>
> To: Richard G Milner <milner@MIT.EDU>
> Subject: Re: g2 at low Q2
>
> Hi Richard,
> Thanks for the information. With 0.85 GeV beam energy,
> I suppose the highest W is about 1.4 to 1.5 GeV. Assuming
> with the spin at 30 to 45 deg, and BLAST has a very large
> angular acceptance, I imagine it should be reasonable to
> separate g1 and g2. So this sounds very interesting from
> the point of view of testing the MAID model and improving
> on the NIKHEF data (goes up to W=1.35 or so, with fairly
> large errors).
> For the study of the various moments of g1 and g2 as a
> function of Q2, there is a huge body of data from Hall B
> from 0.05<Q2<5 GeV2, but it is all Aparr. What is needed
> are modest error bar Aperp data to acurately extract g1,
> and better errors for accurate g2 extraction. The Rss
> experiment in Hall C covered Q2=1.2 up to W=1.8, and the
> SANE experiment will go to higher Q2 and W. So what really
> missing are data for 0.5<Q2<1.2 (all W), and W>1.4 or so
> for Q2<0.5 (need a higher beam energy to get this).
> Knowing what BLAST is doing therefore helps in establishing
> the additional measurements needed to fill in the gaps for
> Aperp. Would you be interested in SANE at lower Q2? The SANE
> collaboration actually is in neeed of substantial group like MIT
> to help build the detectors, among other things.
> Who are the thesis students on the BLAST experiment? Is there
> a proposal or run plan or something that we could possible
> look at?
> Yours, Peter
>
>
>
>
> Prof. Peter Bosted
> email: bosted@jlab.org
> phone: (757) 269-5851
> address: Jefferson Lab MS 12H, 12000 Jefferson Ave, Newport News VA 23606
>
> On Tue, 8 Feb 2005, Richard G Milner wrote:
>
>> Hi Peter,
>> Sorry for the delay in replying. I just returned from ten days in Europe.
>> We have a large amount of inclusive polarized data on both the proton and
>> the deuteron at 850 MeV. The momentum transfer range is approx. 0.1 to
>> 0.5 GeV^2 and goes from threshold to above the Delta resonance. The spin
>> angle is in the range 30 to 45 deg. Is this interesting?
>> regards,
>> Richard
>>
>> On Wed, 2 Feb 2005, Peter Bosted wrote:
>>
>>> Hi Richard,
>>> Could you possibly give me an update on what measurements of
>>> g2 of the proton are planned (or maybe already done?) with
>>> BLAST? Data for 0.1<Q2<1 GeV**2 are sorely needed, if for no
>>> other reason that to reduce the model uncertainty in the
>>> extrtaction of g1 and A1 from the huge body of CLAS data
>>> on Aparr that has been taken (and more is coming, emphasizing
>>> the low Q2 region to get the extended GDH sum rule).
>>> Yours, Peter
>>>
>>> --
>>> Prof. Peter Bosted
>>> email: bosted@jlab.org
>>> phone: (757) 269-5851
>>> address: Jefferson Lab MS 12H, 12000 Jefferson Ave, Newport News VA 23606
>>>
>>
>
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