Proton size puzzle reinforced!

Villigen, 24.01.2013 - International team of scientists confirms surprisingly small proton radius with laser spectroscopy of exotic hydrogen. The initial results puzzled the world three years ago: the size of the proton (to be precise, its charge radius), measured in exotic hydrogen, in which the electron orbiting the nucleus is replaced by a negatively charged muon, yielded a value significantly smaller than the one from previous investigations of regular hydrogen or electron-proton-scattering. A new measurement by the same team confirms the value of the electric charge radius and makes it possible for the first time to determine the magnetic radius of the proton via laser spectroscopy of muonic hydrogen (Science, January 25, 2013). The experiments were carried out at the Paul Scherrer Institut (PSI) (Villigen, Switzerland) which is the only research institute in the world providing the necessary amount of muons. The international collaboration included the Max Planck Institute of Quantum Optics (MPQ) in Garching near Munich, the Swiss Federal Institute of Technology ETH Zurich (Switzerland), the University of Fribourg, the Institut für Strahlwerkzeuge (IFSW) of the Universität Stuttgart, and Dausinger & Giesen GmbH, Stuttgart. The new results fuel the debate as to whether the discrepancies observed can be explained by standard physics, for example an incomplete understanding of the systematic errors that are inherent to all measurements, or whether they are due to new physics.

Мюон указал на ошибку в размере протона

Если же нынешние выводы подтвердятся, то шуму, скорее всего, будет больше, чем вокруг начала работы Большого адронного коллайдера (LHC). Вполне возможно, что вслед за квантовой электродинамикой придётся пересмотреть и Стандартную модель (Standard Model), описывающую все взаимодействия элементарных частиц, кроме гравитационного.

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