arXiv subjects

J. T. Daub

Publications and source records attributed to J. T. Daub.

3 recordsLinked to original sources

arXiv2017

How to employ $\bar{B}^0_d \to J/ψ(πη,\bar{K}K)$ decays to extract information on $πη$ scattering

We demonstrate that dispersion theory allows one to deduce crucial information on $πη$ scattering from the final-state interactions of the light mesons visible in the spectral distributions of the decays $\bar{B}^0_d \to J/ψ(π^0η,K^+K^-,K^0\bar{K}^0)$. Thus high-quality measurements of these differential observables are highly desired. The corresponding rates are predicted to be of the same order of magnitude as those for $\bar{B}^0_d \to J/ψπ^+π^-$ measured recently at LHCb, letting the corresponding measurement appear feasible.

hep-ph↗

arXiv2016

A model-independent analysis of final-state interactions in \bar B_{d/s}^0 --> J/psi pi pi

Exploiting $B$-meson decays for Standard Model tests and beyond requires a precise understanding of the strong final-state interactions that can be provided model-independently by means of dispersion theory. This formalism allows one to deduce the universal pion-pion final-state interactions from the accurately known $ππ$ phase shifts and, in the scalar sector, a coupled-channel treatment with the kaon-antikaon system. In this work an analysis of the decays $\bar B_d^0 \to J/ψπ^+π^-$ and $\bar B_s^0 \to J/ψπ^+π^-$ is presented. We find very good agreement with the data up to 1.05 GeV with a number of parameters reduced significantly compared to a phenomenological analysis. In addition, the phases of the amplitudes are correct by construction, a crucial feature when it comes to studies of $CP$ violation in heavy-meson decays.

hep-ph↗

arXiv2012

Improving the Hadron Physics of Non-Standard-Model Decays: Example Bounds on R-parity Violation

Using the example of selected decays driven by R-parity-violating supersymmetric operators, we demonstrate how strong final-state interactions can be controlled quantitatively with high precision, thus allowing for a more accurate extraction of effective parameters from data. In our examples we focus on the lepton-flavor-violating decays tau --> mu pi+ pi-. In R-parity violation these can arise due to the product of two couplings. We find bounds that are an order of magnitude stronger than previous ones.

hep-ph↗