[Eg1_run] Inclusive EG1 meeting THIS Wednesday

[nguler at jlab.org]

Dear ALL,
I attached (also printed below) the abstract for the APS Spring meeting. I
will submit on Friday. Please let me know your suggestions. I feel I need more
emphasis on the impact of the data on science..

\title{Spin structure functions of the proton and the neutron at low to
moderate Q$^2$}
\author{Nevzat Guler (for CLAS Collaboration)}
\date{April 14, 2013}
\begin{document}
\maketitle
\begin{abstract}

Double spin asymmetries for the proton and the deuteron have been measured in
the EG1b experiment using the CLAS detector at Jefferson Lab. Longitudinally
polarized electrons at energies 1.6, 2.5, 4.2 and 5.7 GeV were scattered from
longitudinally polarized NH$_3$ and ND$_3$ targets. The double spin asymmetry
$A_{\|}$ for the proton and the deuteron has been extracted from these data as
a function of $W$ and $Q^2$ with an unprecedented precision. The virtual
photon asymmetry $A_1$ and the spin structure function $g_1$ were calculated
from these measurements by using the parametrization to the world data for the
virtual photon asymmetry $A_2$ and the unpolarized structure functions $F_1$
and R. The large kinematic coverage of the experiment (0.05 GeV$^2$ $<$ Q$^2$
$<$ 5.0 GeV$^2$ and 1.08 GeV $< W <$ 3.0 GeV) helps us to better understand
the spin structure of the nucleon, especially in the transition region between
hadronic and quark-gluon degrees of freedom. The results on $A_1$, $g_1$ and
the first moment $\Gamma_1^1$, as well as the higher moments using the entire
data set for the deuteron and proton will be presented in this talk. The
measured moments will be compared to the theoretical and phenomenological
calculations. The data will be used to better understand the polarized parton
distributions, quark-hadron duality and help to test the pQCD predictions for
the quark polarization at large $x$ as well as more precise calculations of
higher-twist matrix elements in the framework of the Operator Product
Expansion. In addition, parameterizations of the world data on the asymmetries
and the spin structure functions are studied to create and refine the models
on these quantities that can be used in various applications.  Finally, the
neutron spin structure functions are extracted from the combined proton and
deuteron data using a new unfolding technique. This is the first
representation of the neutron data in the resonance region.

\end{abstract}
\end{document}



> P.S.: Forgot to mention the time: 2:00 p.m. as always
>
> On Jan 7, 2013, at 12:58 PM, Sebastian Kuhn <kuhn at jlab.org> wrote:
>
>> Dear EG1ers,
>>
>> happy New Year to y'all - it's time to resume all outstanding analyses with
>> full force - my hope is that we will not need another year to complete all
>> publications!
>> Our next inclusive meeting takes place on the regular schedule - Wednesday,
>> January 9 2013, Room F226 CC. We will review progress towards the long p and
>> d papers. Also, if anyone would like to present something at the upcoming
>> APS Spring meeting (or the GHP meeting immediately preceding it), it would
>> be good to have an abstract ready on Wednesday - the deadline for the APS
>> meeting is Friday.
>>
>> Looking forward to seeing y'all - Sebastian
>>
>> Call-in instructions:
>> First dial the conference call facility:
>> In US, participant dials the toll free number: 866-740-1260
>> International participant dials: 303-248-0285
>> Then enter the passcode 8156718, followed by the # sign
>>
>
> _______________________________________________
> Eg1_run mailing list
> Eg1_run at jlab.org
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- Nevzat Guler
(757) 553-8318
(505) 606-1667
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