The Proton Spin Structure Function $g_2$ and Generalized Polarizabilities in the Strong QCD Regime Article Swipe

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David Ruth , R. Zielinski , C. Gu , M. Allada , T. Badman , M. Huang , J. Liu , P. Zhu , K. Allada , J. Zhang , A. Camsonne , J. P. Chen , K. Slifer , K. Aniol , J. Annand , J. Arrington , T. Averett , H. Baghdasaryan , V. Bellini , W. Boeglin , J. Brock , C. Carlin , Chen Chen , E. Cisbani , D. Crabb , A. Daniel , D. Day , R. Duve , L. El Fassi , M. Friedman , E. Fuchey , H. Gao , R. Gilman , S. Glamazdin , P. Guèye , M. Hafez , Y. Han , O. Hansen , Maryam Hashemi Shabestari , O. Hen , D. Higinbotham , T. Horn , S. Iqbal , E. Jensen , H. Kang , C. D. Keith , A. Kelleher , D. Keller , H. Khanal , I. Korover , G. Kumbartzki , W. Li , J. Lichtenstadt , R. Lindgren , E. Long , S. Malace , P. Markowitz , J. Maxwell , D. M. Meekins , Z.-E. Meziani , C. McLean , R. Michaels , M. Mihovilovic , N. Muangma , C. Muñoz Camacho , J. Musson , K. Myers , Y. Oh , M. Carmignotto , C. Perdrisat , S. Phillips , E. Piasetzky , J. Pierce , V. Punjabi , Y. Qiang , P. E. Reimer , Y. Roblin , G. Ron , O. Rondon , G. Russo , K. Saenboonruang , B. Sawatzky , A. Shahinyan , R. Sheyor , J. Sjoegren , P. Solvignon-Slifer , N. Sparveris , V. Sulkosky , F. Wesselmann , W. Yan , H. Yang , Hong Yao , Z. Ye , M. Yurov , Y. Zhang , Y. X. Zhao , X. Zheng ·

YOU? · · 2022 · Open Access ·

The strong interaction is not well understood at low energy, or for interactions with low momentum transfer $Q^2$, but one of the clearest insights we have comes from Chiral Perturbation Theory ($\chi$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 $\chi$PT is expected to be valid. Our results include the first ever data for the transverse-longitudinal spin polarizability $\delta_{LT}$, and also extend the coverage of the polarizability $\bar{d_2}$ to very low $Q^2$ for the first time. These results were extracted from moments of the structure function $g_2$, 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 (NH$_3$) target. The $\delta_{LT}$ polarizability has remained a challenging quantity for $\chi$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 $Q^2$. Our proton results provide discriminating power between existing calculations, and will help provide a better understanding of this strong QCD regime.

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Quantum Electrodynamics

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Polarizability Physics Proton Proton spin crisis Nucleon Quantum chromodynamics Spin (aerodynamics) Neutron Perturbation theory (quantum mechanics) Polarization (electrochemistry) Particle physics Quantum electrodynamics Nuclear physics Quantum mechanics Chemistry Molecule Thermodynamics Physical chemistry

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Type: preprint
Language: en
Landing Page: http://arxiv.org/abs/2204.10224
PDF: https://arxiv.org/pdf/2204.10224
OA Status: green
Cited By: 1
Related Works: 10
OpenAlex ID: https://openalex.org/W4224265944

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Title: The Proton Spin Structure Function $g_2$ and Generalized Polarizabilities in the Strong QCD Regime

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Type: preprint

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Language: en

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Publication year: 2022

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Publication date: 2022-04-21

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Authors: David Ruth, R. Zielinski, C. Gu, M. Allada, T. Badman, M. Huang, J. Liu, P. Zhu, K. Allada, J. Zhang, A. Camsonne, J. P. Chen, K. Slifer, K. Aniol, J. Annand, J. Arrington, T. Averett, H. Baghdasaryan, V. Bellini, W. Boeglin, J. Brock, C. Carlin, Chen Chen, E. Cisbani, D. Crabb, A. Daniel, D. Day, R. Duve, L. El Fassi, M. Friedman, E. Fuchey, H. Gao, R. Gilman, S. Glamazdin, P. Guèye, M. Hafez, Y. Han, O. Hansen, Maryam Hashemi Shabestari, O. Hen, D. Higinbotham, T. Horn, S. Iqbal, E. Jensen, H. Kang, C. D. Keith, A. Kelleher, D. Keller, H. Khanal, I. Korover, G. Kumbartzki, W. Li, J. Lichtenstadt, R. Lindgren, E. Long, S. Malace, P. Markowitz, J. Maxwell, D. M. Meekins, Z.-E. Meziani, C. McLean, R. Michaels, M. Mihovilovic, N. Muangma, C. Muñoz Camacho, J. Musson, K. Myers, Y. Oh, M. Carmignotto, C. Perdrisat, S. Phillips, E. Piasetzky, J. Pierce, V. Punjabi, Y. Qiang, P. E. Reimer, Y. Roblin, G. Ron, O. Rondon, G. Russo, K. Saenboonruang, B. Sawatzky, A. Shahinyan, R. Sheyor, J. Sjoegren, P. Solvignon-Slifer, N. Sparveris, V. Sulkosky, F. Wesselmann, W. Yan, H. Yang, Hong Yao, Z. Ye, M. Yurov, Y. Zhang, Y. X. Zhao, X. Zheng

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Landing page: https://arxiv.org/abs/2204.10224

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Concepts: Polarizability, Physics, Proton, Proton spin crisis, Nucleon, Quantum chromodynamics, Spin (aerodynamics), Neutron, Perturbation theory (quantum mechanics), Polarization (electrochemistry), Particle physics, Quantum electrodynamics, Nuclear physics, Quantum mechanics, Chemistry, Molecule, Thermodynamics, Physical chemistry

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