CERN（欧州原子核研究機構）の大型ハドロン衝突型加速器（LHC）の研究チームが、標準模型の予測から逸脱する粒子崩壊を観測した。この結果はLHCb実験から得られたもので、理論値との間に4シグマの食い違いが示されている。もしこれが確認されれば、未発見の粒子や未知の力の存在を示唆する可能性がある。
このデータは、B中間子がカオン、パイ中間子、2つのミューオンへと変化する稀な「ペンギン崩壊」の研究から得られたものである。科学者たちは、2011年から2018年の間に収集された約6500億個のB中間子崩壊の記録を用いて、その角度、エネルギー、崩壊率を詳細に分析した。これらの測定値は標準模型の予測とは異なっており、理論が正しいと仮定した場合、この食い違いが偶然の変動によって生じる確率は1万6000分の1に過ぎない。
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Scientists at the Fritz Haber Institute of the Max Planck Society and international collaborators say they have reconstructed a real-time “movie” of atoms moving for up to a picosecond before an electron-transfer-mediated decay (ETMD) event, showing that nuclear motion and geometry can strongly influence when the decay occurs and what it produces.
Physicists on the LHCb experiment at CERN's Large Hadron Collider have detected the Xicc+ particle, a baryon containing two charm quarks and one down quark. This heavier analogue of the proton resolves a 20-year-old mystery from a previous experiment. The discovery, confirmed at over 7 sigma significance, highlights upgrades to the LHCb detector.
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An international team has shown that a long-standing discrepancy in the muon's magnetic behavior stemmed from earlier calculation limits rather than unknown physics. The work supports the Standard Model and removes one major hint of a possible fifth force of nature.
Researchers using the DAMPE space telescope have identified a shared spectral softening in cosmic rays across multiple particle types. The pattern appears at a rigidity of about 15 teraelectron-volts for protons through iron nuclei. This finding, published in Nature, offers new insight into how these high-energy particles behave in the galaxy.
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An international team of physicists has found that quantum collapse models, potentially linked to gravity, introduce a minuscule uncertainty in time itself. This sets a fundamental limit on clock precision, though far below current detection levels. The research, published in Physical Review Research, explores ties between quantum mechanics and gravity.
Physicists have shown that the key signatures of string theory can arise naturally from a handful of simple rules about particle behavior at extreme energies. Researchers from Caltech, New York University, and a Barcelona institute reached this result using a bootstrap approach that starts with minimal assumptions rather than presupposing strings. The work has been accepted for publication in Physical Review Letters.
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CERN researchers are set to transport around 100 antiprotons by truck around the campus near Geneva, Switzerland, on Tuesday. This marks the first demonstration of a planned antimatter delivery service to labs across Europe. The experiment, known as STEP, aims to enable precision measurements away from the noisy antimatter factory.