Transverse lepton polarization in B -> K(*)l(+)l(-)

[[abstract]]We study the transverse lepton polarization (P-T) in the exclusive processes of B-->Kl(+)l(-) and B-->K*l(+)l(-). We find that the polarization is zero for B-->Kl(+)l(-) but nonzero for B-->K*l(+)l(-). The average values of P-T(B-->K*l(+)l(-)) are 8.4x10(-4) and 2.0x10(-2) for l=mu and l=tau, respectively. The polarization asymmetry is a T-odd observable, which connects with the non-Hermiticity of the effective Hamiltonian, arising mainly from the c (c) over bar intermediate states. We also include the other two orthogonal components, longitudinal and normal polarizations, in our discussions. [S0556-2821(98)02107-9].[[fileno]]2010129010046[[department]]物理