Présidents de session
Standard Model
- Olivier Davignon (Laboratoire Leprince-Ringuet)
Standard Model
- Olivier Davignon (Laboratoire Leprince-Ringuet)
Standard Model
- Olivier Davignon (Laboratoire Leprince-Ringuet)
« What is measured at the LHC, can be well explained by the Standard Model (SM) of Particle Physics. Nevertheless, several phenomena cannot be explained by the SM for example the matter-antimatter-asymmetry detected in our universe and no dark matter candidate was confirmed. In order to resolve these puzzles, it is important to identify good candidates for new physics (NP) searches. One of...
The Standard Model of particle physics states that the three charged leptons $e$, $\mu$ and $\tau$ have the same electroweak coupling (through $W^{\pm}$ and $Z^0$ bosons) and the only difference between them is their coupling to the Higgs field, i.e. their mass. Couple of independent experiments (BaBar, Belle and LHCb) have measured deviations from the SM prediction.
One of the anomalies...
One of the privileged ways to search for signs of New Physics (NP) beyond the Standard Model (SM), is the study of $b\rightarrow s\ell^{+}\ell^{-}$ ($\ell$= electron or muon) transitions which involve Flavour Changing Neutral Currents (FCNC) via box or loop diagrams. The LHCb experiment has recently published a set of measurements in tension with the SM predictions. The aim of this work is to...
Measurements of Higgs boson production cross-sections are carried out in the diphoton decay channel using 139 fb−1 of pp collision data at √s=13 TeV collected by the ATLAS experiment at the LHC. The analysis is based on the definition of 101 distinct signal regions using machine-learning techniques. The inclusive Higgs boson signal strength in the diphoton channel is measured to be...
The angle $\gamma$ of the Cabibbo-Kobayashi-Maskawa (CKM) Matrix had been until recent the least known parameters in the Standard Model of elementary particle physics and is still far from well known. The golden mode for measuring the angle $\gamma$ is a decay of $B^+\rightarrow DK^+$, where $D$ can be either $D^0$ or $\overline{D^0}$ and has a final state accesible from both of them so that...
For over a decade, deviations (“B anomalies”) from the standard model have been observed in $b$-hadron decays, for example, the departure from the lepton flavor universality in $b \to s\ell\ell$ and $b \to c\tau\nu$ transitions. Many new physics models trying to explain these results have larger couplings with the $\tau$-lepton, being 3rd generation, which predict an enhanced branching...
