Exclusive Λb → Λl+l− decay beyond standard model
نویسنده
چکیده
Using the most general, model independent form of the effective Hamiltonian, the exclusive, rare baryonic Λb → Λll (l = μ, τ) decay is analyzed. We study sensitivity of the branching ratio and lepton forward–backward asymmetry to the new Wilson coefficients. Is is shown that these physical quantities are quite sensitive to the new Wilson coefficients. Determination of the position of zero value of the forward–backward asymmetry can serve as a useful tool for establishing new physics beyond the standard model, as well as fixing the sign of the new Wilson coefficients. PACS numbers: 12.60.–i, 13.30.–a, 14.20.Mr e-mail: [email protected] e-mail: [email protected] e-mail: [email protected]
منابع مشابه
Forward–backward asymmetries in Λb → Λl+l− decay beyond the standard model
We study the doubly–polarized lepton pair forward–backward asymmetries in Λb → Λl+l− decay using a general, model independent form of the effective Hamiltonian. We present the general expression for nine double–polarization forward– backward asymmetries. It is observed that, the study of the forward–backward asymmetries of the doubly–polarized lepton pair is a very useful tool for establishing ...
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متن کاملar X iv : h ep - p h / 05 07 32 4 v 1 2 8 Ju l 2 00 5 Polarization effects in exclusive semileptonic Λ b → Λ l + l − decay
The independent helicity amplitudes in the Λb → Λl+l− decay in the standard model and its minimal extension, i.e., with the new vector type interactions, are calculated. We calculate various asymmetry parameters characterizing the angular dependence of the differential decay width for the cascade decay Λb → Λ(→ a + b)V ∗(→ l+l−) with polarized and unpolarized heavy baryons. The sensitivity of t...
متن کاملar X iv : h ep - p h / 05 07 32 4 v 2 5 S ep 2 00 5 Polarization effects in exclusive semileptonic Λ b → Λ l + l − decay
The independent helicity amplitudes in the Λb → Λl+l− decay in the standard model and its minimal extension, i.e., with the new vector type interactions, are calculated. We calculate various asymmetry parameters characterizing the angular dependence of the differential decay width for the cascade decay Λb → Λ(→ a + b)V ∗(→ l+l−) with polarized and unpolarized heavy baryons. The sensitivity of t...
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