### Abstract

Experimental results for mesonic b→sμ^{+}μ- decays show a pattern of deviations from Standard- Model predictions, which could be due to new fundamental physics or due to an insufficient understanding of hadronic effects. Additional information on the b → sμ^{+}μ- transition can be obtained from Λ_{b} decays. This was recently done using the process Λ_{b} → Λμ^{+}μ-, where the L is the lightest strange baryon. A further interesting channel is Λ_{b} → p+K-μ+ μ-, where the p^{+}K^{-} final state receives contributions from multiple higher-mass L resonances. The narrowest and most prominent of these is the Λ (1520), which has J^{P} = 3/2 -. Here we present an ongoing lattice QCD calculation of the relevant Λ_{b} → Λ (1520) form factors. We discuss the choice of interpolating field for the L(1520), and explain our method for extracting the fourteen Λ_{b} → Λ (1520) helicity form factors from correlation functions that are computed in the L(1520) rest frame. We present preliminary numerical results at a pion mass of 340 MeV and a lattice spacing of 0:11 fm. This calculation uses a domain-wall action for the u, d, and s quarks and a relativistic heavy-quark action for the b quark, and is based on gauge-field configurations generated by the RBC and UKQCD Collaborations.

Original language | English (US) |
---|---|

Journal | Proceedings of Science |

Volume | Part F128557 |

State | Published - 2016 |

### ASJC Scopus subject areas

- General

## Fingerprint Dive into the research topics of 'Lattice QCD calculation of form factors for Λ<sub>b</sub> → Λ (1520)ℓ+ℓ- decays'. Together they form a unique fingerprint.

## Cite this

_{b}→ Λ (1520)ℓ+ℓ- decays.

*Proceedings of Science*,

*Part F128557*.