Calculation of 1/m^3 terms in the total semileptonic width of D mesons.

Details Calculation of 1/m^3 terms in the total semileptonic width of D mesons. Calculation of 1/m^3 terms in the total semileptonic width of D mesons.

1994-10-14

arxiv.org/abs/hep-ph/9410293v2

Phys.Rev. D51 (1995) 6167-6176

Physics

High Energy Physics

High Energy Physics - Phenomenology

Final version accepted for publication in Physical Review D (19 pages, 5 figures appended as two PS files at the end of the LA

Scientific paper

10.1103/PhysRevD.51.6167

We calculate the 1/$m^3_c$ corrections in the inclusive semileptonic widths of $D$ mesons. We show that these are due to the novel penguin type operators that appear at this level in the transition operator. Taking into account the nonperturbative corrections leads to the predicted value of the semileptonic width significantly lower than the experimental value. The $1/m^3_c$ worsen the situation or at the very least, within uncertainty, give small contribution. We indicate possible ways out. It seems most probable that violations of duality are noticeable in the energy range characteristic to the inclusive decays in the charm family. Theoretically these deviations are related to divergence of the high-order terms in the power expansion in the inverse heavy quark mass.

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