The mass insertion approximation without squark degeneracy

Details The mass insertion approximation without squark degeneracy The mass insertion approximation without squark degeneracy

2002-05-28

arxiv.org/abs/hep-ph/0205310v1

Phys.Rev. D66 (2002) 037701

Physics

High Energy Physics

High Energy Physics - Phenomenology

7 pages, revtex4

Scientific paper

10.1103/PhysRevD.66.037701

We study the applicability of the mass insertion approximation (MIA) for calculations of neutral meson mixing when squark masses are not degenerate and, in particular, in models of alignment. We show that the MIA can give results that are much better than an order of magnitude estimate as long as the masses are not strongly hierarchical. We argue that, in an effective two-squark framework, m_q=(m_1+m_2)/2 is the best choice for the MIA expansion point, rather than, for example, m_q^2=(m_1^2+m_2^2)/2.

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