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We present an algebraic isospin approach towards a more straightforward and model-independent determination of the weak phase a (or 02) and QCD penguin pollution in B -TT decays. The world ayerages ofcuTrent experimental data allow u$ to impose some useful constralnts on the isospin parameters of B -ffT transitions. We find that the magnitude of a (or ip2) extracted from the inclirect CP violation in T+T-nlode is in agreement with the standard-model expectation from other indirect measurements,doi:10.24532/soken.111.5_e35 fatcat:i2i6kvufhfalxatpxvxmdvzokq