Lifetimes of singly charmed hadrons
James Gratrex, Blaženka Melić, Ivan Nišandžić
Abstract
A bstract We provide an extensive study of the lifetimes of singly charmed baryons and mesons, within the heavy quark expansion with all known corrections included. A special attention is devoted to the choice of the charm mass and wavefunctions of heavy baryons. We give our predictions for lifetimes, lifetime ratios, and semileptonic branching ratios of singly charmed baryons. Our results accommodate the experimentally-favoured hierarchy of singly charmed baryon lifetimes $$ \tau \left({\Xi}_c^0\right)<\tau \left({\Lambda}_c^{+}\right)<\tau \left({\Omega}_c^0\right)<\tau \left({\Xi}_c^{+}\right), $$ <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"> <mml:mi>τ</mml:mi> <mml:mfenced> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:mfenced> <mml:mo><</mml:mo> <mml:mi>τ</mml:mi> <mml:mfenced> <mml:msubsup> <mml:mi>Λ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> </mml:mfenced> <mml:mo><</mml:mo> <mml:mi>τ</mml:mi> <mml:mfenced> <mml:msubsup> <mml:mi>Ω</mml:mi> <mml:mi>c</mml:mi> <mml:mn>0</mml:mn> </mml:msubsup> </mml:mfenced> <mml:mo><</mml:mo> <mml:mi>τ</mml:mi> <mml:mfenced> <mml:msubsup> <mml:mi>Ξ</mml:mi> <mml:mi>c</mml:mi> <mml:mo>+</mml:mo> </mml:msubsup> </mml:mfenced> <mml:mo>,</mml:mo> </mml:math> in contrast to earlier theoretical findings. Predictions for charmed meson lifetimes and semileptonic decay rates are in agreement with a recent comprehensive study and experimental results within uncertainties.