Mastodawn

#Physicists think they’ve solved the #muon mystery
Results dash hopes for a fifth force but provide very precise proof of the #StandardModel of #particlephysics and quantum field theory. According to a paper published in the journal Nature, the discrepancy is due to a calculation fluke, not exciting new #physics, so the Standard Model of particle physics is still holding strong.
https://arstechnica.com/science/2026/04/physicists-think-theyve-solved-the-muon-mystery/

Physicists think they've solved the muon mystery

Results dash hopes for a fifth force but provide very precise proof of Standard Model and QFT.

Ars Technica

CMS Publications May 27

#CMSpaper: Search for new physics in triple boson production in proton-proton collisions at √s = 13 TeV using the effective field theory approach (arXiv:2605.15023) https://arxiv.org/abs/2605.15023 #StandardModel

Search for new physics in triple boson production in proton-proton collisions at $\sqrt{s}$ = 13 TeV using the effective field theory approach

A search for new physics in the production of three massive gauge bosons (VVV, where V is a W or Z boson) is presented. The event selection is most effective in the Lorentz-boosted regime in which all three bosons have a transverse momentum ($p_\mathrm{T}$) above 200 GeV. Standard model (SM) processes contribute few events in this regime. When a boosted W or Z boson decays hadronically, the decay products tend to form a large-radius jet with substructure that reflects the presence of two quarks from the decay; such jets are called V-tagged jets. Special techniques to reconstruct and select V-tagged jets are applied. Events are categorized according to the number and kinematic features of charged leptons and V-tagged jets. Event yields are obtained in bins of a suitable kinematic variable such as the scalar $p_\mathrm{T}$ sum of the reconstructed objects in the event. No excess over SM expectations is observed. Bounds are placed on Wilson coefficients for a set of mass dimension-6 and -8 operators in the framework of SM effective field theory. The two most stringent bounds placed by this analysis are $-$0.13 $\lt$ $c_\mathrm{W}/Λ^2$ $\lt$ 0.12 TeV$^{-2}$ and $-$0.24 $\lt$ $c_\mathrm{Hq3}/Λ^2$ $\lt$ 0.21 TeV$^{-2}$ at 95% CL, where $c_\mathrm{W}$ and $c_\mathrm{Hq3}$ are dimension-6 Wilson coefficients in the Warsaw basis and $Λ$ is the mass scale of new physics.

arXiv.org

CMS Publications May 26

#CMSpaper: First measurements of vector boson scattering in W^±W^± and WZ production in all-leptonic final states at √s = 13.6 TeV (arXiv:2605.15396) https://arxiv.org/abs/2605.15396 #StandardModel

First measurements of vector boson scattering in W$^\pm$W$^{\pm}$ and WZ production in all-leptonic final states at $\sqrt{s}$ = 13.6 TeV

The production cross sections of W$^\pm$W$^{\pm}$ and WZ boson pairs in association with two jets in proton-proton collisions are measured at $\sqrt{s}$ = 13.6 TeV. The data sample corresponds to an integrated luminosity of 171 fb$^{-1}$, collected with the CMS detector during 2022$-$2024. The measurements are performed in the leptonic decay modes: W$^{\pm}$Z $\to$ $\ell^\pmν\ell^{\prime\pm}\ell^{\prime\mp}$ and W$^\pm$W$^{\pm}$ $\to$ $\ell^\pmν\ell^{\prime\pm}ν$, where $\ell, \ell'$ = e or $μ$. The electroweak productions of W$^\pm$W$^{\pm}$ and WZ bosons are each observed with a significance greater than five standard deviations from the background-only hypothesis. Differential fiducial cross sections as functions of several observables are also measured.

arXiv.org

Benjamin Carr, Ph.D. 👨🏻‍💻🧬May 23

A strange ‘#neutrino force’ helped heal a crack in #particlephysics
#Neutrinos and other #particles can produce a subtle force, relevant for precise measurements
Effect not limited to neutrinos. Electrons and other particles could transmit similar forces. It’s counterintuitive, because those particles are not type commonly associated with transmission of forces, according to particle physicists’ well-established theory, called the #standardmodel.
https://www.sciencenews.org/article/neutrino-force-particle-physics
https://archive.ph/x3YBp

A strange ‘neutrino force’ helped heal a crack in particle physics

A neglected force produced by neutrinos and other particles helps atomic physics measurements align with predictions of the standard model.

Science News

CMS Publications May 22

#CMSpaper soon on arXiv: First measurements of vector boson scattering in W^±W^± and WZ production in all-leptonic final states at √s = 13.6 TeV (CERN-EP-2026-126) https://cds.cern.ch/record/2962072 #StandardModel

First measurements of vector boson scattering in $ \mathrm{W}^{\pm}\mathrm{W}^{\pm} $ and $ \mathrm{W}\mathrm{Z} $ production in all-leptonic final states at $ \sqrt{s} = $ 13.6 TeV

The production cross sections of $ \mathrm{W}^{\pm}\mathrm{W}^{\pm} $ and WZ boson pairs in association with two jets in proton-proton collisions are measured at $ \sqrt{s}= $ 13.6 TeV. The data sample corresponds to an integrated luminosity of 171 fb$ ^{-1} $, collected with the CMS detector during 2022--2024. The measurements are performed in the leptonic decay modes: $ \mathrm{W}^{\pm}\mathrm{Z} \to \ell^{\pm}\nu{\ell^{\prime\pm}}{\ell^{\prime\mp}} $ and $ \mathrm{W}^{\pm}\mathrm{W}^{\pm} \to \ell^\pm\nu {\ell}^{\prime\pm}\nu $, where $ \ell, {\ell}{\prime} = \mathrm{e} $ or $ \mu $. The electroweak productions of $ \mathrm{W}^{\pm}\mathrm{W}^{\pm} $ and WZ bosons are each observed with a significance greater than five standard deviations from the background-only hypothesis. Differential fiducial cross sections as functions of several observables are also measured.

CERN Document Server

CMS Publications May 21

#CMSpaper soon on arXiv: Search for new physics in triple boson production in proton-proton collisions at √s = 13 TeV using the effective field theory approach (CERN-EP-2026-041) https://cds.cern.ch/record/2961978 #StandardModel

Search for new physics in triple boson production in proton-proton collisions at $ \sqrt{s} = $ 13 TeV using the effective field theory approach

A search for new physics in the production of three massive gauge bosons ($ \mathrm{V}\mathrm{V}\mathrm{V} $, where V is a W or Z boson) is presented. The event selection is most effective in the Lorentz-boosted regime in which all three bosons have a transverse momentum ($ p_{\mathrm{T}} $) above 200 GeV. Standard model (SM) processes contribute few events in this regime. When a boosted W or Z boson decays hadronically, the decay products tend to form a large-radius jet with substructure that reflects the presence of two quarks from the decay; such jets are called V-tagged jets. Special techniques to reconstruct and select V-tagged jets are applied. Events are categorized according to the number and kinematic features of charged leptons and V-tagged jets. Event yields are obtained in bins of a suitable kinematic variable such as the scalar $ p_{\mathrm{T}} $ sum of the reconstructed objects in the event. No excess over SM expectations is observed. Bounds are placed on Wilson coefficients for a set of mass dimension-6 and -8 operators in the framework of SM effective field theory. The two most stringent bounds placed by this analysis are $ -0.13 < c_\mathrm{W}/\Lambda^2 < 0.12 \text{TeV}^{-2} $ and $ -0.24 < c_{\text{Hq3}}/\Lambda^2 < 0.21 \text{TeV}^{-2} $ at 95\% CL, where $ c_\mathrm{W} $ and $ c_{\text{Hq3}} $ are dimension-6 Wilson coefficients in the Warsaw basis and $ \Lambda $ is the mass scale of new physics.

CERN Document Server

CMS Publications May 18

#CMSPAS: Search for anomalous couplings in WW and WZ production with single-lepton final states at 13 TeV (CMS-PAS-SMP-25-001) https://cds.cern.ch/record/2961592 #StandardModel

Benjamin Carr, Ph.D. 👨🏻‍💻🧬May 14

#Physicists find evidence that the universe isn't perfectly uniform — potentially unraveling a 100-year-old model of #cosmology
The universe may not be perfectly uniform after all. The analyses revealed mild-but-intriguing deviations from the predictions of the #standardmodel. "We saw a surprising violation of an FLRW curvature consistency test, hinting at new #physics beyond the standard model," study co-author Asta Heinesen reports.
https://www.livescience.com/space/cosmology/physicists-find-evidence-that-the-universe-isnt-perfectly-uniform-potentially-unraveling-a-100-year-old-model-of-cosmology

Physicists find evidence that the universe isn't perfectly uniform — potentially unraveling a 100-year-old model of cosmology

The universe may not be perfectly uniform after all, a new series of papers hints. If confirmed, this could upend a nearly 100-year-old model of cosmology.

Live Science

KilleansRow 🇺🇲 🇺🇦🍀May 7

1/n Wednesday #NoeticSpectrum : It’s very hard to trace the current state of the #StandardModel back to any potential #TimeZero without recognition that you have to qualify that origin as a #Local time zero ; we parameterize all of of our inherent metrics in terms of the very finite
#SpeedOfLight,which produces a horizon beyond which we should not be able to see.New data is challenging us beyond those limits. Many welcome that challenge.But the discomfort is too much for some and they run away-