Contribution of low-lying vector resonances to polarization observables in \bar B_d^0 -> \bar K*0 e+ e- decay

Abstract

The branching ratio and other observables for the rare flavour-changing neutral current decay \bar B_d^0 -> \bar K*0 (-> K- pi+) e+ e- are studied below the \bar{c} c threshold. The total amplitude for this decay includes the term coming from the standard model effective Hamiltonian and the term generated by the processes \bar B_d^0 -> \bar K*0 (-> K- pi+) V with intermediate low-lying vector resonances V = rho(770), omega(782), phi(1020) decaying into the e+ e- pair. The resonance contribution to the branching ratio, polarization fractions of the K* meson and coefficients in the angular distribution is calculated. The influence of the resonances on the integrated observables in the region of electron-positron invariant mass up to 1 GeV is studied in view of the planned measurements of the photon polarization at the LHCb.

14 pages, 6 figures, revtex4; two figures omitted, a few references added; version accepted for publication in Physical Review D

References in corpus (5)

• Measurement of the Differential Branching Fraction and Forward-Backword Asymmetry for B->K(*)l+l-
• New observables in the decay mode anti-B --> anti-K*0 l+ l-
• SCET sum rules for B->P and B->V transition form factors
• Photon polarization from helicity suppression in radiative decays of polarized Lambda_b to spin-3/2 baryons
• On the photon polarization in radiative B -> phi K gamma decay

Cited by in corpus (1)

• Contribution of vector resonances to the {\bar B}_d^0 -> {\bar K}^{*0} mu^+ mu^- decay