Towards the time-like pion form factor beyond the elastic regime using domain-wall QCD
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arXiv
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| Autores principales: | , , , , |
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| Formato: | Preprint |
| Publicado: |
2026
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| _version_ | 1866914368574193664 |
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| author | Morandi, Gabriele Bruno, Mattia Bresciani, Francesca Argia Lehner, Christoph Parrino, Julian |
| author_facet | Morandi, Gabriele Bruno, Mattia Bresciani, Francesca Argia Lehner, Christoph Parrino, Julian |
| contents | In this work, we investigate the time-like pion form factor from lattice QCD in the isosymmetric limit, a quantity that plays an important role in understanding hadron physics with substantial phenomenological applications. This observable can be calculated in the elastic region using the finite-volume approach, up to the first (four-particle) open channel. With the goal of accessing the exclusive two-pion form factor in the inelastic region, starting from a three-point correlator involving the vector current and two (temporally-displaced) pion interpolating operators, we examine the associated underlying spectral density and calculate the form factor using a formalism based on the LSZ reduction. A preliminary analysis on one ensemble generated by the RBC/UKQCD collaboration using domain-wall fermions is presented. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2603_04094 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Towards the time-like pion form factor beyond the elastic regime using domain-wall QCD Morandi, Gabriele Bruno, Mattia Bresciani, Francesca Argia Lehner, Christoph Parrino, Julian High Energy Physics - Lattice In this work, we investigate the time-like pion form factor from lattice QCD in the isosymmetric limit, a quantity that plays an important role in understanding hadron physics with substantial phenomenological applications. This observable can be calculated in the elastic region using the finite-volume approach, up to the first (four-particle) open channel. With the goal of accessing the exclusive two-pion form factor in the inelastic region, starting from a three-point correlator involving the vector current and two (temporally-displaced) pion interpolating operators, we examine the associated underlying spectral density and calculate the form factor using a formalism based on the LSZ reduction. A preliminary analysis on one ensemble generated by the RBC/UKQCD collaboration using domain-wall fermions is presented. |
| title | Towards the time-like pion form factor beyond the elastic regime using domain-wall QCD |
| topic | High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2603.04094 |