[Jlabsa_gs] **Today** GSPDA Lunch Seminar - Wednesday, July 9

[Jodi Patient]

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                                  https://gspda.jlab.org/wiki/index.php/Main_Page



This program is supported by the Initiatives Fund Program, a JSA commitment, to

support programs, initiatives, and activities that further the scientific outreach, promote

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user community in ways that complement the Lab’s basic and applied research missions.







                                                     Wednesday, July 9, 2025



                                                                  **L102**



                                                          12:00 am  – 1:00 pm



                           "The SBS Program in Hall A: Decoding the Nucleon's Structure

                                        with Unprecedented Resolution and Precision"





                                                            Provakar Datta





Abstract:

The Super BigBite Spectrometer (SBS) family of experiments has occupied Hall A since fall 2021 and will continue to do so through the end of the current run period. Its primary goal is to extend high‑precision measurements of the nucleon electromagnetic form factors (EMFFs) to unprecedented momentum transfers (Q2). EMFFs are fundamental observables that reveal the nucleon’s spatial and spin structure; yet, apart from the proton magnetic form factor GMp, accurate data at large Q2 remain scarce because of significant experimental challenges.

The state‑of‑the‑art BigBite and Super BigBite spectrometers overcome these challenges, enabling precise measurements of the remaining EMFFs up to—and in some cases beyond—Q2 = 10 (GeV/c)2. The impact of these results is far‑reaching, informing, for example, extractions of quark form factors and the role of two‑photon‑exchange amplitudes in elastic electron–neutron scattering.

Since 2021, four SBS experiments have been completed successfully, and data taking for the final experiment is proceeding smoothly. In this talk, I will present an overview of the SBS physics goals, discuss the key detector designs that enable these challenging measurements, highlight the current status of the data analysis, and conclude with an outlook on the rich physics program that lies ahead.

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