Radiative $$\Xi _{b}^{-}\rightarrow \Xi ^{-}\gamma $$ Ξ b - → Ξ - γ decay

Autor: A. R. Olamaei, K. Azizi
Jazyk: angličtina
Rok vydání: 2022
Předmět:
Zdroj: European Physical Journal C: Particles and Fields, Vol 82, Iss 1, Pp 1-8 (2022)
Druh dokumentu: article
ISSN: 1434-6044
1434-6052
DOI: 10.1140/epjc/s10052-022-10029-1
Popis: Abstract Recently, the LHCb Collaboration performed first search for the rare radiative $$\Xi _{b}^{-}\rightarrow \Xi ^{-}\gamma $$ Ξ b - → Ξ - γ decay and put an upper limit, $$\mathcal{B}(\Xi _{b}^{-}\rightarrow \Xi ^{-}\gamma ) < 1.3 \times 10^{-4}$$ B ( Ξ b - → Ξ - γ ) < 1.3 × 10 - 4 , on its branching ratio. The measurement agrees well with existing theory prediction using SU(3) flavor symmetry method, but shows a slight tension with the previous prediction from light-cone sum rules. Inspired by this, we investigate this decay as well as other radiative decays of $$\Xi _b^{0(-)}(\Xi ^{'-}_{b})$$ Ξ b 0 ( - ) ( Ξ b ′ - ) to $$\Xi ^{0(-)}$$ Ξ 0 ( - ) and $$\Sigma ^{0(-)}$$ Σ 0 ( - ) baryons using the form factors calculated from light-cone QCD sum rules in full theory. we obtain $$ \mathcal{B}(\Xi _{b}^{-}\rightarrow \Xi ^{-}\gamma )=1.08^{+0.63}_{-0.49} \times 10^{-5} $$ B ( Ξ b - → Ξ - γ ) = 1 . 08 - 0.49 + 0.63 × 10 - 5 , which lies below the upper limit set by LHCb and is consistent with flavor-symmetry driven prediction. Our predictions on other channels may be checked in experiment and by other phenomenological approaches.
Databáze: Directory of Open Access Journals
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