D- D mixing in the framework of the HQE revisited
Abstract
We reconsider the leading HQE contributions to the absorptive part of the mixing amplitude of neutral D mesons by taking also αs corrections and subleading 1/mc corrections into account. We show that these contributions to 12 do not vanish in the exact SU(3)F limit and they also can have a large phase. Moreover, we give an example of a new physics model that can enhance these leading HQE terms to 12, which are orders of magnitude lower than the current experimental expectation, by a factor in the upper double-digit range.
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