Mahajan, NamitNamitMahajanMishra, DayanandDayanandMishra2025-08-312025-08-312024-09-0110.1103/PhysRevD.110.0530032-s2.0-85204874118https://d8.irins.org/handle/IITG2025/28762This paper explores the calculation of nonperturbative parameters present in the matrix element of semileptonic inclusive B decays. These are important for the inclusive determination of the Cabbibo-Kobayashi-Maskawa parameters in the Standard Model. We focus on calculating the rate for radiative inclusive decay, B→Xcℓν¯ℓγ, where γ is hard. Both the radiative and nonradiative (B→Xcℓν¯ℓ) modes are found to require the same nonperturbative parameters. We propose forming ratios from B→Xcℓν¯ℓγ and B→Xcℓν¯ℓ widths in different lepton energy ranges. Our results provide an efficient way to unambiguously calculate the nonperturbative parameters, especially when combined with total width calculations of B→Xcℓν¯ℓ. This is shown explicitly by working to O(1/mb) and determining λ1 and λ2.trueArticlehttps://doi.org/10.1103/physrevd.110.053003247000291 September 20240053003arJournal0