Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-09-23
PoS ICHEP2010:193,2010
Physics
High Energy Physics
High Energy Physics - Phenomenology
4 pages, talk at "35th International Conference on High Energy Physics", Paris, France, July 22 -- 28, 2010
Scientific paper
In this talk we report on a study on the mixing of neutral charmed mesons and argue that, at the present stage, a CP violating weak phase of the order of some per mille can not be excluded in the Standard Model. It is shown how some, seemingly reasonable, simplifying assumptions about CKM couplings lead to the wrong conclusion that CP violation of this amount is an unambiguous indication of new physics. The presented results rely on a recent short-distance analysis of the Delta C=2 transition, which confirms the expectation that the dominant contribution is due to effects of flavour symmetry breaking appearing in higher orders of the Heavy Quark Expansion. We investigate meson-antimeson transitions with an intermediate state coupling to the meson's sea quark background, present in dimension 10 and 12, using a factorisation approach to simplify the operator basis. On account of a lifting of GIM suppression by one power of m_s/m_c, the contribution to y=Delta Gamma/2 Gamma is found to exceed that of the formally leading dimension six by a factor close to ten.
Bobrowski Markus
Lenz Alexander
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