24-30 July 2016
Highfield Campus, University of Southampton
Europe/London timezone

Lattice QCD calculation of form factors for $\Lambda_b \to \Lambda(1520) \ell^+ \ell^-$ decays

29 Jul 2016, 16:50
20m
Building 67 Room 1003 (Highfield Campus, University of Southampton)

Building 67 Room 1003

Highfield Campus, University of Southampton

Highfield Campus, Southampton SO17 1BJ, UK
Talk Weak Decays and Matrix Elements Weak Decays and Matrix Elements

Speaker

Prof. Stefan Meinel (University of Arizona / RIKEN BNL Research Center)

Description

Experimental results for mesonic $b \to s \mu^+ \mu^-$ decays show a pattern of deviations from Standard-Model predictions. These deviations could be due to new fundamental physics or due to an insufficient understanding of hadronic effects. Complementary information on the $b \to s \mu^+ \mu^-$ transition can be obtained from $\Lambda_b$ decays. This was recently done using the process $\Lambda_b \to \Lambda \mu^+ \mu^-$, where the $\Lambda$ is the lightest strange baryon. A further interesting channel that is being analyzed by LHCb is $\Lambda_b \to p^+ K^- \mu^+ \mu^-$, where the $p^+ K^-$ final state receives contributions from multiple higher-mass $\Lambda$ resonances. The narrowest and most prominent of these is the $\Lambda(1520)$, which has $J^P=\frac32^-$. We discuss our progress toward a lattice QCD calculation of the relevant $\Lambda_b \to \Lambda(1520)$ form factors.

Primary authors

Gumaro Rendon (University of Arizona) Prof. Stefan Meinel (University of Arizona / RIKEN BNL Research Center)

Presentation Materials