Probing new physics via the transverse amplitudes of B{sup 0}{yields}K*{sup 0}({yields}K{sup -}{pi}{sup +})l{sup +}l{sup -} at large recoil
- Munich University of Applied Sciences, D-80335 Munich (Germany)
- IFAE, Universitat Autonoma de Barcelona, 08193 Bellaterra, Barcelona (Spain)
We perform an analysis of the K* polarization states in the exclusive B meson decay B{sup 0}{yields}K*{sup 0} ({yields}K{sup -}{pi}{sup +})l{sup +}l{sup -} (l=e,{mu},{tau}) in the low dilepton mass region, where the final vector meson has a large energy. Working in the transversity basis, we study various observables that involve the K* spin amplitudes A{sub perpendicular}, A{sub parallel}, A{sub 0} by exploiting the heavy-to-light form-factor relations in the heavy quark and large-E{sub K*} limit. We find that at leading order in 1/m{sub b} and {alpha}{sub s} the form-factor dependence of the asymmetries that involve transversely polarized K* completely drops out. At next-to-leading logarithmic order, including factorizable and nonfactorizable corrections, the theoretical errors for the transverse asymmetries turn out to be small in the standard model (SM). Integrating over the lower part of the dimuon mass region, and varying the theoretical input parameters, the SM predicts A{sub T}{sup (1)}=0.9986{+-}0.0002 and A{sub T}{sup (2)}=-0.043{+-}0.003. In addition, the longitudinal and transverse polarization fractions are found to be (69{+-}3)% and (31{+-}3)%, respectively, so that {gamma}{sub L}/{gamma}{sub T}=2.23{+-}0.31. Beyond the SM, we focus on new physics that mainly gives sizable contributions to the coefficients C{sub 7}{sup eff(')} of the electromagnetic dipole operators. Taking into account experimental data on rare B decays, we find large effects of new physics in the transverse asymmetries. Furthermore, we show that a measurement of longitudinal and transverse polarization fractions will provide complementary information on physics beyond the SM.
- OSTI ID:
- 20709368
- Journal Information:
- Physical Review. D, Particles Fields, Vol. 71, Issue 9; Other Information: DOI: 10.1103/PhysRevD.71.094009; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
- Country of Publication:
- United States
- Language:
- English
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