Rare decays of Λ b →Λ+γ and Λ b →Λ+l + l − in the light-cone sum rules

Rare Λ b → Λ l + l − Decays with Polarized Λ

We investigate the rare baryonic exclusive decays of Λb → Λll (l = e, μ, τ) with polarized Λ. Under the approximation of the heavy quark effective theory (HQET), in the standard model we derive the differential decay rates and various polarization asymmetries by including lepton mass effects. We find that with the long-distance effects the decay branching ratios are 5.3× 10 for Λb → Λll (l = e,...

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Subleading Light - cone distributions functions in the decays Λ b → X s γ and Λ b →

In this paper we investigate the subleading twist corrections to the photon energy spectrum in the decay Λb → Xsγ and to the lepton energy spectrum in Λb → Xulν̄l. As a first step we rederive the matching coefficients of the subleading twist using a much simpler method. Parametrizing the matrix elements for Λb and using reparametrization invariance, we show that the energy spectra close to the e...

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Light - cone distributions functions in the decays Λ b → X s γ and Λ b →

In this paper we investigate the subleading twist corrections to the photon energy spectrum in the decay Λb → Xsγ and to the lepton energy spectrum in Λb → Xulν̄l. As a first step we rederive the matching coefficients of the subleading twist using a much simpler method. Parametrizing the matrix elements for Λb and using reparametrization invariance, we show that the energy spectra close to the e...

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Ja n 20 01 Rare Λ b → Λ l + l − Decays with Polarized Λ

We investigate the rare baryonic exclusive decays of Λb → Λll (l = e, μ, τ) with polarized Λ. Under the approximation of the heavy quark effective theory (HQET), in the standard model we derive the differential decay rates and various polarization asymmetries by including lepton mass effects. We find that with the long-distance effects the decay branching ratios are 5.3× 10 for Λb → Λll (l = e,...

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Λ b Decays into Λ - Vector

A complete study of the angular distributions of the processes, Λ b → ΛV (1 −), with Λ → pπ − and V (J/Ψ) → ℓ + ℓ − or V (ρ 0 , ω) → π + π − , is performed. Emphasis is put on the initial Λ b polarization produced in the proton-proton collisions. The polarization density-matrices as well as angular distributions are derived and help to construct T-odd observables which allow us to perform tests...

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Rare decays of Λ b →Λ+γ and Λ b →Λ+l + l − in the light-cone sum rules

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چکیده

منابع مشابه

Rare Λ b → Λ l + l − Decays with Polarized Λ

Subleading Light - cone distributions functions in the decays Λ b → X s γ and Λ b →

Light - cone distributions functions in the decays Λ b → X s γ and Λ b →

Ja n 20 01 Rare Λ b → Λ l + l − Decays with Polarized Λ

Λ b Decays into Λ - Vector

ژورنال