I do agree with Andy on this point. Please remove that bullet.<br><br>Bill<br><br><div class="gmail_quote">On Wed, Oct 26, 2011 at 8:56 PM, Dr. A.M. Sandorfi <<a href="mailto:sandorfi@jlab.org">sandorfi@jlab.org</a>> wrote:<br>
<blockquote class="gmail_quote">Chandra,<br>
<br>
To be clear, of four possible Clebsch coeffs there's one with the opposite<br>
sign, which might through some interference give you a net opposite sign,<br>
although it's a bit of a stretch. But I certainly see no isospin reasons<br>
that observables for the two final states should have comparable magnitude.<br>
<br>
Andy<br>
<br>
<br>
On 10/26/11 7:34 PM, "A.M. Sandorfi" <<a href="mailto:sandorfi@jlab.org">sandorfi@jlab.org</a>> wrote:<br>
<br>
> Dear Chandra,<br>
><br>
> Interesting results. Beyond the comments others have made, the third bullet<br>
> on your conclusion slide is not likely. In general, polarization observables<br>
> will be sensitive to interfering multipoles that will be channel dependent.<br>
> But we could make a simple model and ignore that: the processes you are<br>
> comparing are gp-> K0 Sigma+ and gp -> K+ Sigma0. The photon doesn't<br>
> conserve isospin and can act as a scalar or a vector. In the former case,<br>
> the ratio of the isospin Clebsch coeff for these two decay channels is<br>
> -sqrt(2); for the latter, the ratio is +1/sqrt(2). So you could get a sign<br>
> change it the scalar photon interaction dominated. ...but it's a stretch to<br>
> assume such a simple isospin dependence for such matrix elements. In any<br>
> case your 4th bullet is correct.<br>
><br>
> Andy<br>
><br>
><br>
><br>
><br>
><br>
> On 10/26/11 5:30 PM, "Volker Crede" <<a href="mailto:crede@fsu.edu">crede@fsu.edu</a>> wrote:<br>
><br>
>> Dear Chandra,<br>
>><br>
>> the results look interesting, indeed. The Sigma^0 and Sigma^+ results differ,<br>
>> but appear to be very similar in shape; the difference for the polarization<br>
>> seems to be about one independent of angle and energy.<br>
>><br>
>> In addition to the previous comments:<br>
>><br>
>> * I also do not understand the argument for the QGP, at least not in the<br>
>> sense<br>
>> we usually discuss QGP. Perhaps you should take it out.<br>
>><br>
>> * You need to be more consistent with the symbol for the proton (should be<br>
>> lower case p) and for the polarization (should be upper case P). It is<br>
>> confusing on some slides where you use P for both.<br>
>><br>
>> Good luck<br>
>><br>
>> Volker<br>
>><br>
>><br>
>> On Oct 26, 2011, at 10:35 AM, <a href="mailto:cnepali@jlab.org">cnepali@jlab.org</a> wrote:<br>
>><br>
>>> Dear all,<br>
>>><br>
>>> I will be giving a talk at DNP meeting on Oct 28th. The talk is<br>
>>><br>
<a href="http://wwwold.jlab.org/Hall-B/secure/hadron/presentations/2011/dnp2011_chand">http://wwwold.jlab.org/Hall-B/secure/hadron/presentations/2011/dnp2011_chand</a>>>><br>
r<br>
>>> a.pdf<br>
>>> . Sorry it is late. Please send me your comment and suggestion.<br>
>>><br>
>>> Thanks,<br>
>>> Chandra<br>
>>><br>
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</blockquote></div><br><br clear="all"><br>-- <br>William J. Briscoe<br>Department of Physics<br>The George Washington University<br>Director, Center for Nuclear Studies<br>Director, Data Analysis Center<br>202-994-6788 (Foggy Bottom Campus)<br>
703-726-8340 (Virginia Science and Technology Campus)<br><br>