Publications
Publication Information
| Title | The Proton Spin Structure Function g2 and Generalized Polarizabilities in the Strong QCD Regime |
| Authors | David Ruth, Ryan Zielinski, Chao Gu, Melissa Cummings, Toby Badman, Min Huang, Jie Liu, Pengjia Zhu, Kalyan Allada, Jixie Zhang, Alexandre Camsonne, Jian-Ping Chen, Karl Slifer, Konrad Aniol, John Annand, John Arrington, Todd Averett, Hovhannes Baghdasaryan, Vincenzo Bellini, Werner Boeglin, James Brock, Christopher Carlin, Chunhua Chen, Evaristo Cisbani, Donald Crabb, Daniel Adamiak, Donal Day, Ryan Duve, Lamiaa El Fassi, Moshe Friedman, Eric Fuchey, Haiyan Gao, Ronald Gilman, Oleksandr Glamazdin, Paul Gueye, Mohamed Hafez, Yuncheng Han, Jens-Ole Hansen, Mitra Hashemi Shabestari, Or Chen, Douglas Higinbotham, Tanja Horn, Sophia Iqbal, Eric Jensen, Hyekoo Kang, Christopher Keith, Aidan Kelleher, Dustin Keller, Hari Khanal, Igor Korover, Gerfried Kumbartzki, Li Wenliang, Jechiel Lichtenstadt, Richard Lindgren, Elena Long, Simona Malace, Pete Markowitz, James Maxwell, David Meekins, Zein-Eddine Meziani, Christine McLean, Robert Michaels, Miha Mihovilovic, Navaphon Muangma, Carlos Munoz Camacho, John Musson, Katherine Mesick, Yoomin Oh, Charles Perdrisat, Sarah Phillips, Eliazer Piasetzky, Josh Pierce, Vina Punjabi, Yi Qiang, Paul Reimer, Yves Roblin, Guy Ron, Oscar Rondon Aramayo, Giuseppe Russo, Kiadtisak Saenboonruang, Bradley Sawatzky, Albert Shahinyan, Ran Shneyour, Johan Sjoegren, Patricia Solvignon-Slifer, Nikolaos Sparveris, Vincent Sulkosky, Frank Wesselmann, Wenbiao Yan, Herun Yang, Huan Yao, Zhihong Ye, Mikhail Yurov, Yuhong Zhang, Yuxiang Zhao, Xiaochao Zheng |
| JLAB number | JLAB-PHY-22-3607 |
| LANL number | (None) |
| Other number | DOE/OR/23177-5481 |
| Document Type(s) | (Journal Article) |
| Associated with EIC: | No |
| Supported by Jefferson Lab LDRD Funding: | No |
| Funding Source: | Nuclear Physics (NP) |
|
Journal Compiled for Nature Physics Refereed | |
| Publication Abstract: | The strong interaction is not well understood at low energy, or for interactions with low momentum transfer Q2, but one of the clearest insights we have comes from Chiral Perturbation Theory (?PT). This effective treatment gives testable predictions for the nucleonic generalized polarizabilities ? fundamental quantities describing the nucleon?s response to an external field. We have measured the proton?s generalized spin polarizabilities in the region where ?PT is expected to be valid. Our results include the first ever data for the transverse-longitudinal spin polarizability ?LT , and also extend the coverage of the polarizability d2 to very low Q2 for the first time. These results were extracted from moments of the structure function g2, a quantity which characterizes the internal spin structure of the proton. Our experiment ran at Jefferson Lab using a polarized electron beam and a polarized solid ammonia (NH3) target. The ?LT polarizability has remained a challenging quantity for ?PT to reproduce, despite its reduced sensitivity to higher resonance contributions; recent competing calculations still disagree with each other and also diverge from the measured neutron data at very low Q2. Our proton results provide discriminating power between existing calculations, and will help provide a better understanding of this strong QCD regime. |
| Experiment Numbers: | E08-027 |
| Group: | Hall A |
| Document: | |
| DOI: | https://doi.org/10.1038/s41567-022-01781-y |
| Accepted Manuscript: | g2p_NaturePhysicsVersion.pdf |
| Supporting Documents: | |
| Supporting Datasets: | |