Nucleon Electric Polarizabilities and Nucleon-Pion Scattering at the Physical Pion Mass

We present a lattice QCD calculation of the nucleon electric polarizabilities at the physical pion mass. Our findings reveal the substantial contributions of the Nπ states to these polarizabilities. Without considering these contributions, the lattice results fall significantly below the experimenta...

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Published in:Physical review letters 2024-10, Vol.133 (14), p.141901, Article 141901
Main Authors: Wang, Xuan-He, Zhang, Zhao-Long, Cao, Xiong-Hui, Fan, Cong-Ling, Feng, Xu, Gao, Yu-Sheng, Jin, Lu-Chang, Liu, Chuan
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container_issue 14
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container_title Physical review letters
container_volume 133
creator Wang, Xuan-He
Zhang, Zhao-Long
Cao, Xiong-Hui
Fan, Cong-Ling
Feng, Xu
Gao, Yu-Sheng
Jin, Lu-Chang
Liu, Chuan
description We present a lattice QCD calculation of the nucleon electric polarizabilities at the physical pion mass. Our findings reveal the substantial contributions of the Nπ states to these polarizabilities. Without considering these contributions, the lattice results fall significantly below the experimental values, consistent with previous lattice studies. This observation has motivated us to compute both the parity-negative Nπ scattering up to a nucleon momentum of ∼0.5  GeV in the center-of-mass frame and corresponding Nγ^{*}→Nπ matrix elements using lattice QCD. Our results confirm that incorporating dynamic Nπ contributions is crucial for a reliable determination of the polarizabilities from lattice QCD. This methodology lays the groundwork for future lattice QCD investigations into various other polarizabilities.
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title Nucleon Electric Polarizabilities and Nucleon-Pion Scattering at the Physical Pion Mass
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