b_i\gamma_{\alpha}\gamma_5b_j)(\bar
c_j\gamma^{\alpha}(1-\gamma_5)c_i)]k^{\frac{1}{2}}(5C_{+}^2+C_{-}^2+6C_{-}C_{+}
)),\nonumber\\
{\cal T}_{PI,\tau\bar\nu_{\tau}}^b &=&
-\frac{G_F^2|V_{cb}|^2}{\pi}m_b^2(1-\frac{m_c}{m_b})^2\nonumber\\
&& [(\frac{(1-z_{\tau})^2}{2} - \frac{(1-z_{\tau})^3}{4})(\bar
b_i\gamma_{\alpha}(1-\gamma_5)b_j)(\bar c_j\gamma^{\alpha}(1-\gamma_5)c_i) +
\label{17}\\
&&  (\frac{(1-z_{\tau})^2}{2} - \frac{(1-z_{\tau})^3}{3})(\bar
b_i\gamma_{\alpha}\gamma_5b_j)(\bar
c_j\gamma^{\alpha}(1-\gamma_5)c_i)],\nonumber\\
{\cal T}_{PI,d\bar u}^{b'} &=&
-\frac{G_F^2|V_{cb}|^2}{4\pi}m_b^2(1-\frac{m_d}{m_b})^2\nonumber\\
&& ([(\frac{(1-z_{-})^2}{2}- \frac{(1-z_{-})^3}{4})
(\bar b_i\gamma_{\alpha}(1-\gamma_5)b_i)(\bar
d_j\gamma^{\alpha}(1-\gamma_5)d_j) + \nonumber\\
&& (\frac{(1-z_{-})^2}{2} -
\frac{(1-z_{-})^3}{3})(\bar b_i\gamma_{\alpha}\gamma_5 b_i)(\bar
d_j\gamma^{\alpha}(1-\gamma_5)d_j)] \label{18}
\\&& [(C_{+} + C_{-})^2 +
\frac{1}{3}(1-k^{\frac{1}{2}})(5C_{+}^2+C_{-}^2-6C_{-}C_{+})]+ \nonumber\\
&& [(\frac{(1-z_{-})^2}{2} - \frac{(1-z_{-})^3}{4})(\bar
b_i\gamma_{\alpha}(1-\gamma_5)b_j)(\bar d_j\gamma^{\alpha}(1-\gamma_5)d_i) +
\nonumber\\
&&  (\frac{(1-z_{-})^2}{2} - \frac{(1-z_{-})^3}{3})(\bar
b_i\gamma_{\alpha}\gamma_5b_j)(\bar
d_j\gamma^{\alpha}(1-\gamma_5)d_i)]k^{\frac{1}{2}}(5C_{+}^2+C_{-}^2-6C_{-}C_{+}
)),\nonumber\\
{\cal T}_{PI,s\bar c}^{b'} &=&
-\frac{G_F^2|V_{cb}|^2}{16\pi}m_b^2(1-\frac{m_s}{m_b})^2\sqrt{(1-4z_{-})}
\nonumber\\
&& ([(1-z_{-})(\bar b_i\gamma_{\alpha}(1-\gamma_5)b_i)(\bar
s_j\gamma^{\alpha}(1-\gamma_5)s_j) + \nonumber\\
&&\frac{2}{3}(1+2z_{-})(\bar b_i\gamma_{\alpha}\gamma_5 b_i)(\bar
s_j\gamma^{\alpha}(1-\gamma_5)s_j)] \label{181}
\\&& [(C_{+} + C_{-})^2 +
\frac{1}{3}(1-k^{\frac{1}{2}})(5C_{+}^2+C_{-}^2-6C_{-}C_{+})]+ \nonumber\\
&& [(1-z_{-})(\bar
b_i\gamma_{\alpha}(1-\gamma_5)b_j)(\bar s_j\gamma^{\alpha}(1-\gamma_5)s_i) +
\nonumber\\
&&\frac{2}{3}(1+2z_{-})(\bar
b_i\gamma_{\alpha}\gamma_5b_j)(\bar
s_j\gamma^{\alpha}(1-\gamma_5)s_i)]k^{\frac{1}{2}}(5C_{+}^2+C_{-}^2-6C_{-}C_{+}
)),\nonumber\\
{\cal T}_{PI,u\bar d}^c &=&
-\frac{G_F^2}{4\pi}m_c^2(1-\frac{m_u}{m_c})^2\nonumber\\
&& ([(\frac{(1-z_{-})^2}{2}- \frac{(1-z_{-})^3}{4})
(\bar c_i\gamma_{\alpha}(1-\gamma_5)c_i)(\bar
u_j\gamma^{\alpha}(1-\gamma_5)u_j) + \nonumber\\
&& (\frac{(1-z_{-})^2}{2} -
\frac{(1-z_{-})^3}{3})(\bar c_i\gamma_{\alpha}\gamma_5 c_i)(\bar
u_j\gamma^{\alpha}(1-\gamma_5)u_j)] \label{19}
\\&& [(C_{+} + C_{-})^2 +
\frac{1}{3}(1-k^{\frac{1}{2}})(5C_{+}^2+C_{-}^2-6C_{-}C_{+})]+ \nonumber\\
&& [(\frac{(1-z_{-})^2}{2} - \frac{(1-z_{-})^3}{4})(\bar
c_i\gamma_{\alpha}(1-\gamma_5)c_j)(\bar u_j\gamma^{\alpha}(1-\gamma_5)u_i) +
\nonumber\\
&&  (\frac{(1-z_{-})^2}{2} - \frac{(1-z_{-})^3}{3})(\bar
c_i\gamma_{\alpha}\gamma_5c_j)(\bar
u_j\gamma^{\alpha}(1-\gamma_5)u_i)]k^{\frac{1}{2}}(5C_{+}^2+C_{-}^2-6C_{-}C_{+}
)),\nonumber\\
{\cal T}_{PI,u\bar d}^{c'} &=&
-\frac{G_F^2}{4\pi}m_c^2(1-\frac{m_s}{m_c})^2\nonumber\\
&& ([\frac{1}{4}(\bar c_i\gamma_{\alpha}(1-\gamma_5)c_i)(\bar
s_j\gamma^{\alpha}(1-\gamma_5)s_j) +
\frac{1}{6}(\bar c_i\gamma_{\alpha}\gamma_5 c_i)(\bar
s_j\gamma^{\alpha}(1-\gamma_5)s_j)] \label{191}
\\&& [(C_{+} - C_{-})^2 +
\frac{1}{3}(1-k^{\frac{1}{2}})(5C_{+}^2+C_{-}^2+6C_{-}C_{+})]+ \nonumber\\
&& [\frac{1}{4}(\bar
c_i\gamma_{\alpha}(1-\gamma_5)c_j)(\bar s_j\gamma^{\alpha}(1-\gamma_5)s_i) +
\nonumber\\
&&\frac{1}{6}(\bar
c_i\gamma_{\alpha}\gamma_5c_j)(\bar
s_j\gamma^{\alpha}(1-\gamma_5)s_i)]k^{\frac{1}{2}}(5C_{+}^2+C_{-}^2+6C_{-}C_{+}
)),\nonumber\\
{\cal T}_{PI,\nu_{\tau}\bar\tau}^c &=&
-\frac{G_F^2}{\pi}m_c^2(1-\frac{m_s}{m_c})^2\nonumber\\
&& [(\frac{(1-z_{\tau})^2}{2} - \frac{(1-z_{\tau})^3}{4})(\bar
c_i\gamma_{\alpha}(1-\gamma_5)c_j)(\bar s_j\gamma^{\alpha}(1-\gamma_5)s_i) +
\label{192}\\
&&  (\frac{(1-z_{\tau})^2}{2} - \frac{(1-z_{\tau})^3}{3})(\bar
c_i\gamma_{\alpha}\gamma_5c_j)(\bar
s_j\gamma^{\alpha}(1-\gamma_5)s_i)],\nonumber\\
{\cal T}_{WS,bc} &=&
\frac{G_F^2|V_{cb}|^2}{4\pi}m_b^2(1+\frac{m_c}{m_b})^2(1-z_{+})^2[(C_{+}^2 +
C_{-}^2 +
 \frac{1}{3}(1 - 