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The Standard Model is the physics theory describing known elementary particles and their electromagnetic, weak, and strong interactions.
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CMS combined 138 fb-1 of 2016-2018 collision data and measured a Higgs signal strength of 1.01 +/- 0.05, against a Standard Model value of 1. Any new physics that alters the Higgs rate now has room mainly near or below that 5 percent precision.
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University of Portsmouth-led physicists find, in a simplified model, that decoherence can suppress quantum tunnelling and lock a field in its false vacuum. The Higgs field, which may itself sit in a false vacuum, is the example that motivates the work, though the study does not model it.
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Physicists at HKU and Beijing Normal University derived lensing predictions straight from a three-dimensional wave simulation. On one well-studied quasar, the image positions came out closer to the data than the models they compared against.
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ETH Zurich and PSI report in Nature Physics that antimuons stopped in a film of superfluid helium near absolute zero come out as muonium atoms at similar speeds and almost parallel, the beam quality a free-fall measurement needs.
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Five papers in The Astrophysical Journal report the helium made in the universe's first five minutes with 0.5% uncertainty, three times tighter than the previous standard, from 15 chemically pristine dwarf galaxies.
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Because the Lambda decays too fast to sit in a field, BESIII read its electric dipole moment off the correlated spins of entangled pairs, and found nothing above 10^-19 e cm, three orders below the only prior direct limit.
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A Michigan-led ATLAS analysis claims world-best sensitivity to the Higgs boson interacting with itself, using machine learning on data already in hand, four years before the LHC upgrade.
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Physicists at Fermilab, Stanford and Delaware project that a Faraday cage shielding measurement would be three times more sensitive to millicharged particles than accelerator searches.
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