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[2026-10-22] · src Camarasa-Domene, González-Alonso, Novoa-Brunet, "First observation of weak magnetism in neutron decay", arXiv:2610.26792v1 (hep-ph, 19 Oct 2026)
A global reanalysis of existing data extracts the weak-magnetism form factor of the free neutron as g_M = 4.47(87), against the conserved-vector-current (CVC) prediction of 4.71, and excludes g_M = 0 at 5.1σ. The β asymmetry alone cannot separate g_M from the axial-to-vector ratio λ; adding the neutron lifetime and the superallowed 0⁺→0⁺ 𝓕t value breaks the degeneracy. The significance stays within 5.0–6.1σ across variations of the neutron dataset, despite its known internal tensions.
This confirms a 1950s CVC prediction in the simplest β-decay system, and it is a consistency check on the inputs used for V_ud and λ rather than a new measurement. The 19% uncertainty on g_M is large, the claim is a preprint with no independent scrutiny yet, and the authors themselves say a full energy-dependence analysis would improve g_M by only a few percent now. Treat "first observation" as a statement about a combined fit, not a dedicated experiment. I read only the abstract.
[2026-10-22] · src Hajjar, Bustamante, Palomares-Ruiz, "Measurement of the neutrino cross section across the TeV scale using IceCube data", arXiv:2610.24068v1 (16 Oct 2026)
Using eight years of IceCube through-going muon-neutrino data, the authors measure the νμ charged-current neutrino-nucleon cross section from 150 GeV to 40 TeV with uncertainties below 20% throughout, against roughly 20–40% for earlier collider, atmospheric and astrophysical measurements. The result agrees with Standard Model predictions. For the first time above 1 TeV there are mild hints that ν and ν̄ cross sections can be separated.
It closes the gap between accelerator measurements and the higher-energy astrophysical regime, where deviations in nucleon structure or new physics would show first. Agreement with the SM at under 20% rules out only large deviations. The ν/ν̄ separation is a hint, not a result. The abstract gives no central values; I read only the abstract.
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[2026-10-22] · src —
Trumpet takes today: four days since it was last assigned, the longest gap of the three, and it wants a short session rather than a long one. The last trumpet work was Scales & intervals, so today moves to the Syncopation section of Arban to work on time feel, paired with a melody from the Art of Phrasing for the musical target. Keep it to about 30 minutes in the middle register.
5 minutes: long tones on written G (second line) down by whole steps to low C, mp, 8 beats each with a breath between. Then 2 minutes of lip slurs on C-G-C at mf, slowly.
Pick one Syncopation study from Arban and play it with a metronome at quarter = 60, 72, then 84, clicking only on beats 1 and 3 at the last tempo. Success criterion: three consecutive passes at each tempo with every off-beat entry landing exactly where the click says, then one pass at 84 with the click on beat 1 only.
Play one melody from the Art of Phrasing, chosen from the early numbers so it sits in a comfortable register. Decide where the phrase peaks and play every other bar quieter than that peak. The aim is one melody that sounds sung, with the breath marks where you chose them.
About 30 minutes, and stop sooner if the tone spreads or the lips buzz rather than ring. A short session that ends while the sound is still good beats a long one that ends ragged; do not add a second block.
[2026-10-22] · src —
hearClifford Brown and Max Roach — Joy Spring · Tidal · Spotify
Brown plays fast, syncopated bebop lines with an even, round tone and no strain in the sound. Listen to where his phrases begin on off-beats and still resolve squarely on the beat, and to how the tone stays full as the tempo rises. That is the same off-beat accuracy today's Syncopation work is aiming at, played by someone who made it sound easy.