The smeared $R$-ratio in isoQCD from first-principles lattice simulations
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| Main Authors: | , , , , , , , , |
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| Format: | Preprint |
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2026
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| _version_ | 1866912974498693120 |
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| author | Margari, Francesca Bacchio, Simone De Santis, Alessandro Evangelista, Antonio Frezzotti, Roberto Gagliardi, Giuseppe Garofalo, Marco Sanfilippo, Francesco Tantalo, Nazario |
| author_facet | Margari, Francesca Bacchio, Simone De Santis, Alessandro Evangelista, Antonio Frezzotti, Roberto Gagliardi, Giuseppe Garofalo, Marco Sanfilippo, Francesco Tantalo, Nazario |
| contents | The $R$-ratio is a phenomenological observable of great relevance, both in itself and in applications such as the dispersive approach to the muon anomalous magnetic moment. It can be investigated from first-principles with controlled statistical and systematic errors in lattice QCD by introducing an arbitrary smearing kernel and employing spectral reconstruction techniques, such as the well-known Hansen-Lupo-Tantalo method. Improving upon a first study published in 2023, we show preliminary results using the correlation functions produced by ETMC in $N_f = 2+1+1$ lattice simulations at four lattice spacings, different volumes and with higher statistics w.r.t. our previous study. The new correlators, thanks to the implementation of the Low Mode Average technique, allow the determination of the $R$-ratio smeared with Gaussian kernels of widths down to $σ\sim 200$ with phenomenologically relevant precision. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_19070 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | The smeared $R$-ratio in isoQCD from first-principles lattice simulations Margari, Francesca Bacchio, Simone De Santis, Alessandro Evangelista, Antonio Frezzotti, Roberto Gagliardi, Giuseppe Garofalo, Marco Sanfilippo, Francesco Tantalo, Nazario High Energy Physics - Lattice The $R$-ratio is a phenomenological observable of great relevance, both in itself and in applications such as the dispersive approach to the muon anomalous magnetic moment. It can be investigated from first-principles with controlled statistical and systematic errors in lattice QCD by introducing an arbitrary smearing kernel and employing spectral reconstruction techniques, such as the well-known Hansen-Lupo-Tantalo method. Improving upon a first study published in 2023, we show preliminary results using the correlation functions produced by ETMC in $N_f = 2+1+1$ lattice simulations at four lattice spacings, different volumes and with higher statistics w.r.t. our previous study. The new correlators, thanks to the implementation of the Low Mode Average technique, allow the determination of the $R$-ratio smeared with Gaussian kernels of widths down to $σ\sim 200$ with phenomenologically relevant precision. |
| title | The smeared $R$-ratio in isoQCD from first-principles lattice simulations |
| topic | High Energy Physics - Lattice |
| url | https://arxiv.org/abs/2603.19070 |