[Hallc] [EXTERNAL] invitation to participate in Pion-LT experiment

[hamlet at jlab.org]

         Dear Garth,

We are ready and happy to take part in the Pion-LT measurements
Everything will depend on the possibility of visits.
If the epidemic situation is favorable and the leadership of Hall C
support it, then at least two people from the Yerevan group will
participate in the upcoming shifts.
I hope everything will be more favorable next year and we can guarantee
our participation
In any case, I wish you good luck and I am sure you will get very
important and interesting scientific results.

                     Best wishes, Hamlet.

> Dear all,
>
> We would like to invite you and your group to join the Pion-LT experiment
> (E12-19-006) running in Hall C this fall.  Apologies if you already
> received this message through other means.
>
> The Pion-LT experiment is a "12 GeV flagship experiment" that will
> acquire the definitive p(e,e'pi+)n L/T-separation data set that will
> remain
> important for decades to come.  The motivations of the experiment are
> two-fold:
> 1) study the hard-soft factorization regime.
>     Validation of understanding of pi+ hard exclusive reaction towards 3D
> hadron
>     imaging.  The key to this validation is precision
> longitudinal-transverse
>     separated data.  If sigma_L becomes large, leading twist GPDs can be
> studied
>     in JLab kinematics, while a large sigma_T could enable transversity
> GPD
>     studies.  We will also measure exclusive pi-/pi+ ratios from 2H
> target,
>     yielding additional insight into hard-soft factorization at modest
> Q^2.
> 2) determine the pion form factor (Fpi) to high Q^2.
>     We will indirectly measure Fpi using the "pion cloud" of the proton
> via
>     p(e,e'pi+)n.  The pion form factor is the clearest test case for
> studies of
>     QCD's transition from non-perturbative to perturbative regions, and
> Hall C
>     is the only facility worldwide that can perform this measurement.  We
> will
>     acquire high quality data up to Q^2=6.0 GeV^2, with an extension to
> Q^2=8.5
>     GeV^2 (with larger errors).
>
> For more information, please see our recent Collaboration presentation:
>    https://urldefense.proofpoint.com/v2/url?u=http-3A__lichen.phys.uregina.ca_index-5Ffiles_talks_fpi12-5Fhallc-5F21jul-5Fs.pdf&d=DwICaQ&c=CJqEzB1piLOyyvZjb8YUQw&r=QxP5KTzkAiDxkNbQw9W17g&m=zGnhYdbKDWhIA_kIqaGccFCpNLusK4T-LZwiuHRsDLU&s=MSXQ3pPceRLiiTxu4RsJgVFk9eGvTu8VD78TWZLDOm8&e=
> or the Pion-LT website:
>    https://redmine.jlab.org/projects/hall-c/wiki/
>
> The low epsilon portion of E12-19-006 is scheduled to start on 22 August
> and is
> expected to run until the end of the year.  The high epsilon portion of
> the
> experiment is scheduled for fall 2022.
>
> We really need your assistance to make the experiment a success!!
> We would like co-authors to take shifts in both the 2021 and 2022 runs, if
> possible.  For fall 2021, there are 756 person-shifts needed @ 2
> workers/shift,
> so we would like co-authors to take 10 shifts, with a remaining ~5 shifts
> in
> 2022.
>
> We hope that COVID-19 travel restrictions will continue to be relaxed
> during
> the autumn, to enable non-local collaborators to participate in the
> experiment.
> If you would like to contribute, but the restrictions preclude your travel
> to
> JLab, please contact us for alternate arrangements.
>
> The shift schedule can be found here:
> https://misportal.jlab.org/mis/apps/physics/shiftSchedule/index.cfm?experimentRunId=HALLC-PIONLT
>
> Thanks and best wishes,
> Dave Gaskell (gaskelld at jlab.org)
> Tanja Horn   (hornt at jlab.org)
> Garth Huber  (huberg at uregina.ca)
>
> --
> Dr. Garth Huber, Dept. of Physics, Univ. of Regina, Regina, SK S4S0A2,
> Canada.
> tel: 1-306-585-4240. fax: 1-306-585-5659.
>
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