[Sbs] Call for shift takers for A_LL experiment

[Arun Tadepalli]

Dear Collaborators,

As you may know, we will transition from the GEn-II experiment to A_LL experiment starting Oct 31st.

Regarding the A_LL experiment:
The observed cross sections of exclusive pion photoproduction reactions in the wide angle regime have been a puzzle for over ~70 years, since the early measurements conducted at SLAC. Calculations that use the hangbag approach that use only twist-2 contributions fall short by over two orders of magnitude. Recent calculations that include twist-3 contributions claim that they are not just important, but are dominant. To test the validity of the handbag mechanism in this wide angle regime, a test of the helicity correlations A_LL and K_LL is therefore timely and necessary to further our understanding of the interaction mechanism in this regime that is responsible for the observed cross sections.

Hence, a timely request: Please consider signing up for some shifts to help achieve this goal! Your help is greatly appreciated!

The shift schedule can be found here:
https://misportal.jlab.org/mis/physics/shiftSchedule/?experimentRunId=SBS-GEn-2022

Best regards,

Spokespersons
Arun Tadepalli
Bogdan Wojtsekhowski
Gordon Cates
Rachel Montgomery
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