Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass Insertions vs. Mass Eigenstates calculations in Flavour Physics   We present and prove a theorem of matrix analysis, the Flavour Expansion
Theorem (or FET), according to which, an analytic function of a Hermitian
matrix can be expanded polynomially in terms of its off-diagonal elements with
coefficients being the divided differences of the analytic function and
arguments the diagonal elements of the Hermitian matrix. The theorem is
applicable in case of flavour changing amplitudes. At one-loop level this
procedure is particularly natural due to the observation that every loop
function in the Passarino-Veltman basis can be recursively expressed in terms
of divided differences. FET helps to algebraically translate an amplitude
written in mass eigenbasis into flavour mass insertions, without performing
diagrammatic calculations in flavour basis. As a non-trivial application of FET
up to a third order, we demonstrate its use in calculating strong bounds on the
real parts of flavour changing mass insertions in the up- squark sector of the
MSSM from neutron Electric Dipole Moment (nEDM) measurements, assuming that
CP-violation arises only from the CKM matrix.

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The categories of this paper are: astro-ph
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The categories of this paper are: q-bio
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The categories of this paper are: patt-sol
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The categories of this paper are: chem-ph
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The categories of this paper are: q-fin
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The categories of this paper are: gr-qc
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The categories of this paper are: quant-ph
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The categories of this paper are: nucl-th
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The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: bayes-an
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The categories of this paper are: cond-mat
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The categories of this paper are: stat
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The categories of this paper are: mtrl-th
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The categories of this paper are: comp-gas