$D-\bar D$ mixing in the framework of the HQE revisited

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We reconsider the leading HQE contributions to the absorptive part of the mixing amplitude of neutral $D$ mesons by taking also $α_s$ corrections and subleading $1/m_c$ corrections into account. We show that these contributions to $Γ_{12}$ 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 $Γ_{12}$, which are orders of magnitude lower than the current experimental expectation, by a factor in the upper double-digit range.
4 pages, 3 figures

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High Energy Physics - Phenomenology

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http://salesiana.dossiersoluciones.com/handle/123456789/228543

Consulte el texto completo en el siguiente enlace:

https://arxiv.org/abs/0904.3971
 http://arxiv.org/abs/0904.3971

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arXiv