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<div align="center"><span
style="font-family: "NewCenturySchlbk","serif";"><o:p></o:p></span><b
style=""><span style="font-family: "NewCenturySchlbk","serif";"><o:p> </o:p></span></b><span
style="font-size: 18pt; font-family: "Times","serif"; color: black;">“</span><span
style="font-size: 16pt; font-family: "Times","serif";">Proton Form
Factor Measurements at JLab
with Polarization Method: Detectors, Analyses, Results and Theoretical
Interpretation</span><span
style="font-size: 18pt; font-family: "Times","serif"; color: black;">”</span><span
style="font-size: 16pt; font-family: "Times","serif";"><o:p></o:p></span></div>
<p class="MsoNormal" style=""><span
style="font-family: "Times","serif";"><o:p> </o:p></span></p>
<p class="MsoNormal" style="margin-left: 0.25in; text-align: center;"
align="center"><b style=""><span
style="font-size: 22pt; font-family: "Times","serif"; color: rgb(192, 0, 0);">Lubomir
Pentchev</span></b><b style=""><span
style="font-size: 22pt; font-family: "Times","serif";">
<br>
</span></b><b style=""><span
style="font-size: 18pt; font-family: "Times","serif";">The College
of William and Mary</span></b><b style=""><span
style="font-size: 22pt; font-family: "Times","serif";"><o:p></o:p></span></b></p>
<p class="MsoNormal" style="margin-left: 0.25in;"><b style=""><span
style="font-size: 22pt; font-family: "NewCenturySchlbk","serif";"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-align: center;" align="center"><span
style="font-family: "NewCenturySchlbk","serif";"><br>
</span><b style=""><u><span
style="font-size: 14pt; font-family: "NewCenturySchlbk","serif";">ABSTRACT<o:p></o:p></span></u></b></p>
<p class="MsoNormal" style="text-align: justify;"><o:p> </o:p></p>
<p class="MsoNormal"><b style=""><span style="font-size: 14pt;"><span
style=""> </span></span></b><span
style="font-family: "Times","serif";">The
discrepancy between the Rosenbluth and Polarization results for the
proton form
factor ratio has not been resolved yet, almost 10 years after it was
discovered
in the first GEp experiment in Hall A at JLab. Significant experimental
and
theoretical efforts have been made to reconcile the results and also to
extend
the form factor measurements up to highest possible Q<sup>2</sup> using
the
polarization method. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Times","serif";"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-family: "Times","serif";">A new,
1744 channel electromagnetic calorimeter, BigCal has
been built for the recent Hall C experiments: GEp-2gamma and GEp-3.
Details of
the calorimeter performance will be presented.<span style="">
</span>Critical issues in the analyses will be discussed and
preliminary
results from the two experiments will be presented. GEp-2gamma was the
first
experiment to investigate at percent level effects beyond Born
approximation in
the proton form factor ratio measurements. The GEp-2gamma results will
be
discussed and a brief review of the two-photon exchange calculations
will be
given. GEp-3 measured the form factor ratio up to Q<sup>2</sup> of 8.5
GeV2.
The 12 GeV upgrade will make it possible to target Q<sup>2</sup> values
of 15
GeV<sup>2</sup>. To achieve the needed high detector acceptance at very
high
luminosities, an experiment, that will use GEM technology for tracking
and
calorimetry for triggering, will be described.<o:p></o:p></span></p>
<p class="MsoNormal" style=""><b style=""><span style="font-size: 14pt;"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-align: center;" align="center"><b
style=""><span style="font-size: 14pt;"><o:p> </o:p></span></b></p>
<p class="MsoNormal" style="text-align: center;" align="center"><b
style=""><span style="font-size: 14pt;">Friday, October
23, 2009<o:p></o:p></span></b></p>
<p class="MsoBodyText3" style="text-align: center;" align="center"><b><span
style="font-size: 14pt;">10:00AM<o:p></o:p></span></b></p>
<p class="MsoBodyText3" style="text-align: center;" align="center"><b><span
style="font-size: 14pt;">CEBAF Center F113</span></b><b><span
style="font-size: 16pt;"><o:p></o:p></span></b></p>
<span style="font-size: 14pt;"><o:p></o:p><span style=""> </span><o:p></o:p></span>
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style="font-size: 14pt;"><o:p></o:p></span><tt><br>
</tt><span style="font-size: 14pt;"><o:p></o:p></span></p>
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