[Clas_hadron] Morrison abstract

Wed Jun 29 22:24:49 EDT 2011

Igor,

OK. There are two double polarization data points that are not yet an 
asymmetry. Brian can change his wording to state "double polarization 
asymmetry measurements" instead of "double polarization observables".

Brian should also be sure to state that he is only referring to published 
data when talking about previous measurements. Moreover, he should change 
the wording so that it is clear that he is only talking about eta 
photoproduction.

-Michael

On Wed, 29 Jun 2011, Igor Strakovsky wrote:

> yep, Mike
>
> On Wed, 29 Jun 2011 20:57:01 -0400, Eugene Pasyuk <pasyuk at jlab.org> wrote:
>
>> This is absolute helicity dependent cross section difference.
>> If you divide it by the the sum of the cross sections you will get
>> asymmetry E.
>>
>> -Eugene
>>
>> Michael Dugger wrote, On 06/29/11 20:30:
>>>
>>> Igor,
>>>
>>> I want to make sure I understand what you wrote.
>>>
>>> What is the "delta" in "delta[DSG(1/2)-DSG(3/2)]"
>>>
>>>
>>> -Michael
>>>
>>>
>>> On Wed, 29 Jun 2011, Igor Strakovsky wrote:
>>>
>>>> That is delta[DSG(1/2)-DSG(3/2)]
>>>>
>>>> On Wed, 29 Jun 2011 20:03:06 -0400 (EDT), Michael Dugger<dugger at jlab.org>
>>>> wrote:
>>>>
>>>>>
>>>>> Igor,
>>>>>
>>>>> The types of measurements given in your table are: S,P,T,DSG,SGT, and DX13.
>>>>>
>>>>> I assume you are referring to the DX13 type measurement when you say that
>>>>> there are some double pol data. Is this a correct assumption?
>>>>>
>>>>> What is the type DX13? I am unfamiliar with this.
>>>>>
>>>>> -Michael
>>>>>
>>>>> On Wed, 29 Jun 2011, Igor Strakovsky wrote:
>>>>>
>>>>>> Hi Brian and John,
>>>>>>
>>>>>> I am afraid but cannot agree with both of you.  The world database
>>>>>> have both unpol and pol measurements already - see enclosed map for
>>>>>> Eg = 320-2350 MeV.  Our recent CB at MAMI DSG measurements [MC(10)]
>>>>>> allowed to publish GE09 vs previously unpublished solution E429.
>>>>>> Obviously, pol data have a minor contribution and there are no E
>>>>>> data.  Some double pol measurements are available - unfortunately
>>>>>>
>>>>>> Igor
>>>>>>
>>>>>> ---------------------------------------------------------------------
>>>>>> GPEP  NORMALIZED Chi2 SUMMARY    6/29/11   for:
>>>>>> EP072 eta-photo-prod  03/07 Arndt/Strak 09/23/10
>>>>>> Sol1-E429  (700-2900) 2818/1811 32 PRM                       SP06   6
>>>>>> Sol2-GE09  (700-2900) 6295/4211 34 PRM                       SM05   6
>>>>>>
>>>>>> Thresholds=  706.88
>>>>>>
>>>>>>     SR    TYPE  Nexp Ndta  Emn    Emx    Amn    Amx    Ch1       Ch2
>>>>>>   SU(09)   DSG   8    32 1650.0 2350.0  130.5  161.8  1078.53   432.72
>>>>>>   HO(69)   DSG   3     3 2030.0 2200.0   36.0   58.0    43.81    45.39
>>>>>>   VA(80)   S     5     5 1390.0 1800.0   46.0   73.0    38.37    36.98
>>>>>>   HO(71)   DSG   3     3  890.0 1050.0   82.3  108.3    18.58    13.30
>>>>>>   MC(10)   DSG 120  2400  710.4 1394.8   18.2  161.8 13254.32  3329.22
>>>>>>   VA(80)   DSG   5     5 1390.0 1800.0   46.0   57.0    24.34    21.15
>>>>>>   HO(88)   DSG  15    15  808.0 1008.0   45.0  114.0    66.82    90.47
>>>>>>   WI(09)   DSG  51   860 1044.0 2325.0   32.9  148.2  3403.68  3462.69
>>>>>>   HE(70)   P     5     5  830.0 1105.0   90.0   90.0    17.62    22.10
>>>>>>   BA(63)   DSG   2     4  937.0  978.0  103.0  106.0    11.50    12.86
>>>>>>   BA(07)   S    15   150  724.0 1472.0   33.4  161.1   417.06   462.59
>>>>>>   CR(09)   DSG  30   600  875.0 2325.0   18.2  161.8  1503.85  1528.95
>>>>>>   DU(02)   DSG  24   190  775.0 1925.0   45.6  134.4   447.43   448.50
>>>>>>   BO(98)   T    10    50  717.0 1105.0   33.0  145.0   116.45   185.77
>>>>>>   DY(95)   DSG   2    12  729.0  753.0   15.0  165.0    27.91    26.57
>>>>>>   DE(69)4  DSG   6    17  725.0  875.0   18.2  158.4    36.75    42.03
>>>>>>   KR(95)   SGT  54    54  706.9  792.3    0.0    0.0   110.82   101.01
>>>>>>   HO(71)   P     2     2  890.0  890.0   82.3  108.3     3.62     1.99
>>>>>>   BA(68)   DSG   3    12  775.0  850.0   12.5   94.3    19.53    21.56
>>>>>>   KR(95)   DSG  10   100  715.9  789.9   25.8  154.2   137.63   142.53
>>>>>>   CR(05)   DSG  31   545  774.0 2277.0   18.2  138.6   689.85   638.58
>>>>>>   BA(07)   DSG  30   487  714.0 1477.0   31.8  161.8   571.53   353.57
>>>>>>   BA(66)   DSG  20    20  836.0  955.0  107.0  119.0    20.65    23.36
>>>>>>   BO(74)   DSG  36    36 1240.0 2310.0    7.0   46.0    35.29    29.17
>>>>>>   NA(06)   DSG  18   180  718.0 1142.0   25.8  154.2   166.52   275.72
>>>>>>   ER(07)   S    34    34  842.6 1344.7   50.7  148.4    26.17    25.03
>>>>>>   CH(73)   DSG   9     9 1490.0 2200.0   35.7   45.6     5.50     5.50
>>>>>>   PR(95)   SGT   8     8  708.6  718.7    0.0    0.0     4.19    12.77
>>>>>>   ER(68)   SGT   1     1  729.0  729.0    0.0    0.0     0.03     0.03
>>>>>>   AR(03)   DSG   2     2  783.5  790.2   70.0   70.0     0.02     0.02
>>>>>>   DY(95)   SGT   1     1  753.0  753.0    0.0    0.0     0.01     0.04
>>>>>>   AR(03)   DX13  2     2  783.5  790.2   70.0   70.0     0.01     0.05
>>>>>>
>>>>>>   Nexp=  565 Ndata= 5844  ChN(1)=  22298.4 ChN(2)=  11792.2
>>>>>>                          ChU(1)= 116999.2 ChU(2)= 238508.1
>>>>>>
>>>>>> On Wed, 29 Jun 2011 15:18:26 -0700, John Price<jprice at csudh.edu>  wrote:
>>>>>>
>>>>>>> Hi Brian:
>>>>>>>
>>>>>>> Your statement that "...there are no previous measurements for double
>>>>>>> polarization observables" desperately needs to be preceded by a
>>>>>>> statement of exactly what process you're talking about.  CLAS has
>>>>>>> published several double polarization observables in multiple reactions
>>>>>>> over the years, as have (I suspect) several other facilities.  I would
>>>>>>> suggest rewording the second sentence as
>>>>>>>
>>>>>>> "In the eta photoproduction process on the proton, there are relatively
>>>>>>> few single polarization measurements, compared to unpolarized
>>>>>>> differential cross section measurements, and no double polarization
>>>>>>> measurements."  Some wordsmithing is still needed there.
>>>>>>>
>>>>>>> John
>>>>>>>
>>>>>>> --
>>>>>>> John W. Price
>>>>>>> Professor and Chair of Physics
>>>>>>> CSU Dominguez Hills
>>>>>>> 310-243-3403
>>>>
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>
> Igor Strakovsky, SAID CNS The George Washington University
> Tel: 703-726-8344(NV),202-994-4742(FB),Skype: igors1945_2
> Fax: 202-994-3001(FB),Emails: igor at va.gwu.edu, igor at jlab.org
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