Le mystère du muon résolu par un nouveau calcul précis

Une équipe internationale a démontré qu'une divergence persistante dans le comportement magnétique du muon découlait des limites des calculs précédents plutôt que d'une physique inconnue. Ces travaux confortent le Modèle standard et éliminent un indice majeur d'une possible cinquième force de la nature.

Des chercheurs dirigés par le physicien Zoltan Fodor de l'université d'État de Pennsylvanie ont consacré plus d'une décennie à l'utilisation de la chromodynamique quantique sur réseau via des superordinateurs pour recalculer le moment magnétique anomal du muon. Leur méthode hybride a combiné des simulations théoriques à courte et moyenne distance avec des données expérimentales à plus grande échelle, permettant d'atteindre un accord entre la théorie et l'expérience avec un écart inférieur à une demi-déviation standard.

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Lab scene depicting contactless magnetic friction discovery: hovering metallic blocks with magnetic fields and graphs breaking Amontons' law.
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Researchers discover contactless magnetic friction

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Scientists at the University of Konstanz have identified a new type of sliding friction that occurs without physical contact, driven by magnetic interactions. This phenomenon breaks Amontons' law, a 300-year-old physics principle, by showing friction peaks at certain distances rather than increasing steadily with load. The findings appear in Nature Materials.

An international team of researchers has detected signs of a rare η′-mesic nucleus, a fleeting particle trapped inside an atomic nucleus. This exotic state, observed in a high-precision experiment, suggests the η′ meson's mass decreases in dense nuclear matter. The finding could shed light on how matter acquires mass through the structure of space's vacuum.

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Physicists with the STAR collaboration have observed particles emerging directly from empty space during high-energy proton collisions at Brookhaven National Laboratory. The experiment provides strong evidence that mass can arise from vacuum fluctuations, as predicted by quantum chromodynamics. Quark-antiquark pairs promoted to real particles retained spin correlations tracing back to the vacuum.

Undergraduate students at the University of Hamburg have constructed a simple cavity detector to search for axions, hypothetical particles that may constitute dark matter. Despite limited resources, their experiment set new limits on axion properties, as detailed in a recent study. The project demonstrates that small-scale efforts can contribute to major physics challenges.

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Nuclear physicists at the University of Tennessee have made three key findings about the rapid neutron-capture process that forms heavy elements like gold in stellar events. Their research, conducted at CERN's ISOLDE facility, clarifies how unstable atomic nuclei decay. The results, published in Physical Review Letters, could refine models of element formation in the universe.

Astronomers have produced a detailed map of the Milky Way's magnetic field, revealing a surprising diagonal reversal in the Sagittarius Arm. The findings, based on new radio telescope data, help explain how this invisible force structures the galaxy. Led by scientists at the University of Calgary, the studies were published this month in The Astrophysical Journal.

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