标题： 在单Cabibbo抑制D衰变中检验新物理 显示英文标题

标题： Testing for new physics in singly Cabibbo suppressed D decays

摘要： 我们设计了测试，以确定最近测量的单Cabibbo抑制D衰变中直接CP破坏的新物理起源。 这些测试以各种D衰变中CP不对称性的求和规则形式出现。 它们基于标准模型中CP破坏来源于主导树图振幅与Delta I=1/2 penguin振幅之间的干涉这一事实。 如果观察到的CP破坏是由于有效弱哈密顿量的新物理贡献引起的，这些贡献改变了同位旋Delta I=3/2，则求和规则将被破坏。 显示英文摘要

摘要： We devise tests for a new physics origin of the recently measured direct CP violation in singly Cabibbo suppressed D decays. The tests take the form of sum rules for the CP asymmetries in various D decays. They are based on the fact that within the standard model CP violation arises from interference of the dominant tree amplitudes with the Delta I=1/2 penguin amplitudes. The sum rules would be violated if the observed CP violation is due to new physics contributions to the effective weak Hamiltonian that change isospin by Delta I=3/2.