Can one detect new physics in I=0 and/or I=2 contributions to the decays B ->pi pi
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Can one detect new physics in I=0 and/or I=2 contributions to the decays B ->pi pi

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Can one detect new physics in I=0 and/or I=2 contributions to the decays B ->pi pi

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Baek, Seungwon; Botella Olcina, Francisco J. Perfil; London, David; Silva, Joao P.
This document is a artículoDate2005

Este documento está disponible también en : http://hdl.handle.net/10550/39631
We study the effects of new-physics contributions to B --> pi pi decays, which can be parametrized as four new complex quantities. A simple analysis is provided by utilizing the reparametrization invariance of the decay amplitudes. We find that six quantities can be reabsorbed into the definitions of Standard Model-like parameters. As a result, the usual isospin analysis provides only two constraints on new physics which are independent of estimates for the Standard Model contributions. In particular, we show that one is not sensitive to new physics affecting the I=0 amplitudes. On the other hand, I=2 new physics can be detected, and its parameters can be measured by using independent determinations of the weak phases. We obtain constraints on these new-physics parameters through a fit to the current experimental data.

    Baek, Seungwon Botella Olcina, Francisco J. London, David Silva, Joao P. 2005 Can one detect new physics in I=0 and/or I=2 contributions to the decays B ->pi pi Physics Review D 72 3 036004
http://dx.doi.org/10.1103/PhysRevD.72.036004

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