Interpreting top-quark LHC measurements in the standard-model effective field theory
This note proposes common standards and prescriptions for the effective-field-theory interpretation of top-quark measurements at the LHC.
hep-ph↗
arXiv subjects
J. Kamenik
Publications and source records attributed to J. Kamenik.
Charm meson resonances in $D \to P \ell ν$ decays
Motivated by recent experimental results we reconsider semileptonic $D \to P \ell ν_{\ell} $ decays within a model which combines heavy quark symmetry and properties of the chiral Lagrangian. We include excited charm meson states, some of them recently observed, in our Lagrangian and determine their impact on the charm meson semileptonic form factors. We find that the inclusion of excited charm meson states in the model leads to a rather good agreement with the experimental results on the $q^2$ shape of the $F_+(q^2)$ form factor. We also calculate branching ratios for all $D \to P \ell ν_{\ell} $ decays.
hep-ph↗
New-Physics scenarios in $ΔS = 2$ decays of the B_c meson
The $ΔS = 2$ transition $b \to s s \bar d$ is extremely small in the standard model, proceeding only via box diagrams. Such decays are thus an appropriate ground for searching new physics. We present a study of several two-body and three-body decays of the B_c meson belonging to this class. Our calculation covers the minimal supersymmetric model with and without R-parity and a two-Higgs-doublet model. The current limits on the parameters of these models allow for rather large branching ratios for several two and three-body hadronic decay modes of B_c, up to the 10^{-4} range in the minimal supersymmetric model with R-parity violation.
hep-ph↗