Post-selection shifts the transition frequency of helium in an atomic beam
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arXiv
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| Autori principali: | , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866909391108702208 |
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| author | Wen, Jin-Lu Tang, Jia-Dong Lv, Ya-Nan Sun, Yu R. Zou, Chang-Ling Dong, Jun-Feng Hu, Shui-Ming |
| author_facet | Wen, Jin-Lu Tang, Jia-Dong Lv, Ya-Nan Sun, Yu R. Zou, Chang-Ling Dong, Jun-Feng Hu, Shui-Ming |
| contents | Post-selecting output states in measurements can effectively amplify weak signals and improve precision. However, post-selection effects may also introduce unintended biases in precision measurements. Here, we investigate the influence of post-selection in the precision spectroscopy of the $2^3S - 2^3P$ transition of helium ($^4$He) using an atomic beam. We directly observe that post-selection based on atomic positions causes a shift in the measured transition frequency, amounting to approximately -55 kHz. After accounting for this post-selection shift, we obtain a corrected frequency of $276,764,094,712.45 \pm 0.86$ kHz for the $2^3S_1 - 2^3P_0$ transition. Combining this result with existing data for $^3$He, we derive a new value for the difference in squared nuclear charge radii, $δr^2 [r_{h}^{2} - r_α^{2}] = 1.0733 \pm 0.0021$ fm$^2$. This value shows a $2.8σ$ deviation from measurements of muonic helium ions, potentially pointing to new physics that challenges lepton universality in quantum electrodynamics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_09958 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Post-selection shifts the transition frequency of helium in an atomic beam Wen, Jin-Lu Tang, Jia-Dong Lv, Ya-Nan Sun, Yu R. Zou, Chang-Ling Dong, Jun-Feng Hu, Shui-Ming Atomic Physics Quantum Physics Post-selecting output states in measurements can effectively amplify weak signals and improve precision. However, post-selection effects may also introduce unintended biases in precision measurements. Here, we investigate the influence of post-selection in the precision spectroscopy of the $2^3S - 2^3P$ transition of helium ($^4$He) using an atomic beam. We directly observe that post-selection based on atomic positions causes a shift in the measured transition frequency, amounting to approximately -55 kHz. After accounting for this post-selection shift, we obtain a corrected frequency of $276,764,094,712.45 \pm 0.86$ kHz for the $2^3S_1 - 2^3P_0$ transition. Combining this result with existing data for $^3$He, we derive a new value for the difference in squared nuclear charge radii, $δr^2 [r_{h}^{2} - r_α^{2}] = 1.0733 \pm 0.0021$ fm$^2$. This value shows a $2.8σ$ deviation from measurements of muonic helium ions, potentially pointing to new physics that challenges lepton universality in quantum electrodynamics. |
| title | Post-selection shifts the transition frequency of helium in an atomic beam |
| topic | Atomic Physics Quantum Physics |
| url | https://arxiv.org/abs/2411.09958 |