6533b856fe1ef96bd12b2eec
RESEARCH PRODUCT
Note on the slope parameter of the baryonic Λb→Λc Isgur–Wise function
J. G. KörnerHong-ying JinMing-qiu HuangChun Liusubject
Semileptonic decayQuantum chromodynamicsPhysicsBaryonNuclear and High Energy PhysicsQCD sum rulesParticle physicsCabibbo–Kobayashi–Maskawa matrixB mesonSum rule in quantum mechanicsLambdadescription
Abstract Using the framework of the Heavy Quark Effective Theory we have re-analyzed the Isgur–Wise function describing semileptonic Λ b → Λ c decays in the QCD sum rule approach. The slope parameter of the Isgur–Wise function is found to be ρ 2 = 1.35 ± 0.13 , which is consistent with an experimental measurement and a lattice calculation. To O ( 1 / m b , 1 / m c ) of the heavy quark expansion the integrated Λ b decay width is used to extract the CKM matrix element V c b for which we obtain a value of | V c b | = 0.041 ± 0.004 ± 0.001 in excellent agreement with the value of | V c b | determined from semileptonic B → D ∗ decays.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2005-11-01 | Physics Letters B |