The proton radius puzzle is an unanswered problem in physics relating to the size of the proton. Historically the proton charge radius was measured by two independent methods, which converged to a value of about 0.877 femtometres (1 fm = 10−15 m). This value was challenged by a 2010 experiment using a third method, which produced a radius about 4% smaller than this, at 0.842 femtometres. New experimental results reported in the autumn of 2019 agree with the smaller measurement, as does a re-analysis of older data published in 2022. While some believe that this difference has been resolved, this opinion is not yet universally held.
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| - Problème de la taille du proton (fr)
- Proton radius puzzle (en)
- 质子半径之谜 (zh)
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| - The proton radius puzzle is an unanswered problem in physics relating to the size of the proton. Historically the proton charge radius was measured by two independent methods, which converged to a value of about 0.877 femtometres (1 fm = 10−15 m). This value was challenged by a 2010 experiment using a third method, which produced a radius about 4% smaller than this, at 0.842 femtometres. New experimental results reported in the autumn of 2019 agree with the smaller measurement, as does a re-analysis of older data published in 2022. While some believe that this difference has been resolved, this opinion is not yet universally held. (en)
- 质子半径之谜（英語：proton radius puzzle）是物理学中与質子大小有关的一个尚未解决的问题。历史上，质子半径是通过两种独立的方法测量的，它们的收敛值约为0.877飞米（1 fm = 10−15 m）。2010年的一项实验使用了第三种方法，该方法测得的半径为0.842飞米，比之前的结果小5%。这一分歧仍未得到公认的解释，是一个正在进行的研究课题。 (zh)
- Le problème de la taille du proton est un problème de la physique nucléaire. Il concerne le rayon de charge du proton, pour lequel des méthodes différentes donnent deux groupes non compatibles de valeurs, autour de 0,84 et 0,88 femtomètre. (fr)
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| - The proton radius puzzle is an unanswered problem in physics relating to the size of the proton. Historically the proton charge radius was measured by two independent methods, which converged to a value of about 0.877 femtometres (1 fm = 10−15 m). This value was challenged by a 2010 experiment using a third method, which produced a radius about 4% smaller than this, at 0.842 femtometres. New experimental results reported in the autumn of 2019 agree with the smaller measurement, as does a re-analysis of older data published in 2022. While some believe that this difference has been resolved, this opinion is not yet universally held. (en)
- Le problème de la taille du proton est un problème de la physique nucléaire. Il concerne le rayon de charge du proton, pour lequel des méthodes différentes donnent deux groupes non compatibles de valeurs, autour de 0,84 et 0,88 femtomètre. Mis en évidence en 2010, ce problème est résolu en 2019 par une expérience d' (en) dont la durée a été de 8 années, aboutie en septembre 2019, par une équipe de chercheurs de l'université de York, à Toronto, au Canada, conduite par (en) et son équipe. Finalement, les deux méthodes (hydrogène muonique et classique) donnent des résultats compatibles, mais donnant une valeur numérique légèrement plus petite que les valeurs anciennement admises. (fr)
- 质子半径之谜（英語：proton radius puzzle）是物理学中与質子大小有关的一个尚未解决的问题。历史上，质子半径是通过两种独立的方法测量的，它们的收敛值约为0.877飞米（1 fm = 10−15 m）。2010年的一项实验使用了第三种方法，该方法测得的半径为0.842飞米，比之前的结果小5%。这一分歧仍未得到公认的解释，是一个正在进行的研究课题。 (zh)
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