Leading Isgur-Wise form factor of ${\Lambda }_b\to {\Lambda }_{c1}$ transition using QCD sum rules

Ming-Qiu Huang, Jong-Phil Lee, Chun Liu +1

The leading Isgur-Wise form factor $\xi (y)$ parametrizing the semileptonic transitions ${\Lambda }_b\to {\Lambda }_{c1}^{1/2}\ell \bar{\nu }$ and ${\Lambda }_b\to {\Lambda }_{c1}^{3/2}\ell \bar{\nu }$ is calculated by using the QCD…