Detailed study of the Λb→Λℓ+ℓ− decays in the standard model
| Autor: | Srimoy Bhattacharya, Sunando Kumar Patra, Soumitra Nandi, Ria Sain |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
Physics
Particle physics 010308 nuclear & particles physics High Energy Physics::Phenomenology Observable Lambda 01 natural sciences Soft-collinear effective theory Lattice (order) 0103 physical sciences Heavy quark effective theory High Energy Physics::Experiment Invariant mass 010306 general physics Lepton |
| Zdroj: | Physical Review D. 101 |
| ISSN: | 2470-0029 2470-0010 |
| DOI: | 10.1103/physrevd.101.073006 |
| Popis: | Based on the standard model (SM) of particle physics, we study the decays $\Lambda_b \to \Lambda \ell^+ \ell^-$ in light of the available inputs from lattice and the data from LHCb. We fit the form-factors of this decay mode using the available theory and experimental inputs after defining different fit scenarios and checking their consistencies. The theory inputs include the relations between the form-factors in heavy quark effective theory (HQET) and soft collinear effective theory (SCET) at the endpoints of di-lepton invariant mass squared $q^2$. Utilizing the fit results, we have predicted a few observables related to this mode. We have also predicted the observable $R_{\Lambda} = Br(\Lambda_b \to \Lambda \ell_i^+\ell_i^- )/Br(\Lambda_b \to \Lambda \ell_j^+\ell_j^-)$ where $\ell_{i}$ and $\ell_j$ are charged leptons of different generations ($i \ne j$). At the moment, we do not observe noticeable differences in the extracted values of the observables in fully data-driven and SM like fit scenarios. |
| Databáze: | OpenAIRE |
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