Considering QCD in the limit of the number of colors $N_c$ being large provides important constraints on the interactions between baryons. These constraints are particularly valuable when the available data is too limited to accurately determine the interactions. In particular, while symmetry-preserving nucleon-nucleon interactions are constrained from a large amount of scattering data,...
CEBAF delivers the world’s highest intensity and highest precision multi-GeV electron beams and has been do so for more than 25 years. In Fall 2017, with the completion of the 12 GeV upgrade and the start of the 12 GeV science program, a new era at the Laboratory began. The 12 GeV era is now well under way and many experimental results are delivered from the three Halls A, B, and C that...
The Sigma+ -> p mu+ mu- decay is observed for the first time at the
LHCb experiment.
This is a flavour changing neutral current sensitive to physics beyond
the Standard Model, which could modify it's properties.
In particular the HyperCP experiment years ago presented an evidence of
this decay with a hint of a possible unknown intermediate particle.
This was excluded by LHCb already in...
The NA62 experiment at CERN collected the world's largest dataset of charged kaon decays in 2016-2018, leading to the first measurement of the branching ratio of the ultra-rare $K^+ \rightarrow \pi^+ \nu \bar\nu$ decay, based on 20 candidates. In this talk NA62 reports new results from the analyses of rare kaon and pion decays, using data samples collected in 2017-2018.
A sample of $K^+...
KOTO is the dedicated experiment to study the CP-violating decay $K_L^0 \to \pi^0 \nu \overline{\nu}$. This decay is sensitive to New Physics because its branching ratio is predicted to be $3 \times 10^{-11}$ with only 2\% theoretical uncertainty. By using the data collected in 2021, we have set the worldwide best limit on the branching ratio of this decay to be $2.0 \times 10^{-9}$ at the 90%...
PIONEER is a next-generation precision experiment proposed at Paul Scherrer Institute, Switzerland, to perform high precision measurements of rare pion decays. The measurement of the charged pion branching ratio R$_{e/μ}$ = Γ(π+→e+ν(γ) / Γ(π+→ μ+ν(γ) for pion decays to positrons relative to muons is extremely sensitive to a wide variety of new physics effects. At present, the Standard Model...