b-baryon semi-tauonic decays in the Standard Model

Abstract

Within the framework of HQET, ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ and ${\Omega }_b\to {\Omega }_c^{(\ast )}\tau {\bar{\nu }}_{\tau }$ weak decays are studied to the order of $1/m_c$ and $1/m_b$. Helicity amplitudes are written down. Relevant Isgur-Wise functions given by QCD sum rule and large $N_c$ methods are applied in the numerical analysis. The baryonic R-ratios $R({\Lambda }_c)$ and $R({\Omega }_c^{(\ast )})$ are obtained.

arXiv comment20 pages, 7 figures and 1 table; v2: reference added

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Cited by in corpus (3)

• Revisiting semileptonic decays of ${\Lambda }_{b(c)}$ supported by baryon spectroscopy
• Baryons and baryoniums in the perspective of QCD sum rules
• Analysis of the semileptonic decays ${\Sigma }_b\to {\Sigma }_{c}l{\bar{\nu }}_l$, ${\Xi }_b^{\prime }\to {\Xi }_c^{\prime }l{\bar{\nu }}_l$ and ${\Omega }_b\to {\Omega }_{c}l{\bar{\nu }}_l$ in QCD sum rules