Reanalysis of rare radiative Ξ b − → Ξ − γ decay in QCD

• Published in: Physical review. D 2024-03, Vol.109 (5), Article 054020
• Main Authors: Aliev, T. M., Ozpineci, A., Sarac, Y.
• Format: Article
• Language: English
• ISSN: 2470-0010; 2470-0029
• DOI: 10.1103/PhysRevD.109.054020

The upper limit of the branching ratio of the rare Ξ b − → Ξ − γ decay is obtained as BR ( Ξ b − → Ξ − γ ) < 1.3 × 10 − 4 by the LHCb. In the present work we study this decay within the light cone QCD sum rules employing the Ξ b distribution amplitudes. At the first stage, the form factors entering the Ξ b − → Ξ − γ decay are obtained. Next, using the results for the form factors the corresponding branching ratio for this decay is estimated to be BR ( Ξ b − → Ξ − γ ) = ( 4.8 ± 1.3 ) × 10 − 5 . This value lies below the upper limit established by the LHCb collaboration. Our finding for the branching ratio is also compared with the results of the other theoretical approaches existing in the literature.