Nucleon strange electromagnetic form factors from $N_f=2+1+1$ lattice QCD
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866918413375373312 |
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| author | Alexandrou, Constantia Bacchio, Simone Bode, Mathis Finkenrath, Jacob Herten, Andreas Iona, Christos Koutsou, Giannis Pittler, Ferenc Prasad, Bhavna Spanoudes, Gregoris |
| author_facet | Alexandrou, Constantia Bacchio, Simone Bode, Mathis Finkenrath, Jacob Herten, Andreas Iona, Christos Koutsou, Giannis Pittler, Ferenc Prasad, Bhavna Spanoudes, Gregoris |
| contents | We present the nucleon strange electromagnetic form factors using four lattice QCD ensembles with $N_f=2+1+1$ twisted mass clover-improved fermions and quark masses tuned to approximately their physical values. The four ensembles have similar physical volume and lattice spacings of $a=0.080$ fm, $0.068$ fm, $0.057$ fm and $0.049$ fm allowing us to take the continuum limit directly at the physical pion mass point. We compute nucleon three-point correlation functions with high statistics, where the disconnected fermion loops are evaluated stochastically with spin-color dilution and hierarchical probing. We find non-zero values for both electric and magnetic form factors. We extract the strange electric and magnetic radii, as well as the strange magnetic moment in the continuum limit by studying the momentum dependence of the form factors. We also compute the charm electromagnetic form factors within the same setup, which we find to be consistent with zero within the statistical precision of our data. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_26591 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Nucleon strange electromagnetic form factors from $N_f=2+1+1$ lattice QCD Alexandrou, Constantia Bacchio, Simone Bode, Mathis Finkenrath, Jacob Herten, Andreas Iona, Christos Koutsou, Giannis Pittler, Ferenc Prasad, Bhavna Spanoudes, Gregoris High Energy Physics - Lattice We present the nucleon strange electromagnetic form factors using four lattice QCD ensembles with $N_f=2+1+1$ twisted mass clover-improved fermions and quark masses tuned to approximately their physical values. The four ensembles have similar physical volume and lattice spacings of $a=0.080$ fm, $0.068$ fm, $0.057$ fm and $0.049$ fm allowing us to take the continuum limit directly at the physical pion mass point. We compute nucleon three-point correlation functions with high statistics, where the disconnected fermion loops are evaluated stochastically with spin-color dilution and hierarchical probing. We find non-zero values for both electric and magnetic form factors. We extract the strange electric and magnetic radii, as well as the strange magnetic moment in the continuum limit by studying the momentum dependence of the form factors. We also compute the charm electromagnetic form factors within the same setup, which we find to be consistent with zero within the statistical precision of our data. |
| title | Nucleon strange electromagnetic form factors from $N_f=2+1+1$ lattice QCD |
| topic | High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2603.26591 |