From CREX to CEvNS: The Weak Radius of 40Ar
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arXiv
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866909769260859392 |
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| author | Piekarewicz, J. |
| author_facet | Piekarewicz, J. |
| contents | Despite significant theoretical efforts, the CREX-PREX dilemma remains unresolved, preventing the reliable prediction of neutron (or weak-charge) radii that, besides their intrinsic nuclear-structure interest, often serve to quantify the impact of nuclear uncertainties in searches for new physics. Coherent elastic neutrino-nucleus scattering is a clean and attractive portal to new physics whose sensitivity may be impacted by such nuclear uncertainties. In this paper we use CREX as our main anchor, together with a strong calcium-argon correlation, to provide a robust baseline for the weak radius of ${}^{40}$Ar: $R_{\rm wk}^{\,40} = 3.452 \pm 0.028~\text{(stat)} \pm 0.022~\text{(syst)}\,\text{fm}$.The weak radius of argon is an observable highly relevant to ongoing and future liquid-argon campaigns that encodes the loss of coherence at small momentum transfers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_03645 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | From CREX to CEvNS: The Weak Radius of 40Ar Piekarewicz, J. Nuclear Theory High Energy Physics - Experiment High Energy Physics - Theory Nuclear Experiment Despite significant theoretical efforts, the CREX-PREX dilemma remains unresolved, preventing the reliable prediction of neutron (or weak-charge) radii that, besides their intrinsic nuclear-structure interest, often serve to quantify the impact of nuclear uncertainties in searches for new physics. Coherent elastic neutrino-nucleus scattering is a clean and attractive portal to new physics whose sensitivity may be impacted by such nuclear uncertainties. In this paper we use CREX as our main anchor, together with a strong calcium-argon correlation, to provide a robust baseline for the weak radius of ${}^{40}$Ar: $R_{\rm wk}^{\,40} = 3.452 \pm 0.028~\text{(stat)} \pm 0.022~\text{(syst)}\,\text{fm}$.The weak radius of argon is an observable highly relevant to ongoing and future liquid-argon campaigns that encodes the loss of coherence at small momentum transfers. |
| title | From CREX to CEvNS: The Weak Radius of 40Ar |
| topic | Nuclear Theory High Energy Physics - Experiment High Energy Physics - Theory Nuclear Experiment |
| url | https://arxiv.org/abs/2509.03645 |