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The $b\to d$ penguin amplitude receives contributions from internal $u$, $c$and $t$-quarks. We show that it is impossible to measure the weak phase of anyof these penguin contributions without theoretical input. However, a singleassumption involving the hadronic parameters makes it possible to obtain theweak phase and test for the presence of new physics in the $b\to d$flavour-changing neutral current

IS IT POSSIBLE TO MEASURE THE WEAK PHASE OF A PENGUIN DIAGRAM?