Can Large $u, d$ Quark Masses be Inferred from the $D_s \to n π$ decay rate?

Details Can Large $u, d$ Quark Masses be Inferred from the $D_s \to n π$ decay rate? Can Large $u, d$ Quark Masses be Inferred from the $D_s \to n π$ decay rate?

1995-07-25

arxiv.org/abs/hep-ph/9507405v1

Phys.Rev. D52 (1995) 6612-6615

Physics

High Energy Physics

High Energy Physics - Phenomenology

4 double-column pages, revtex, 3 figures

Scientific paper

10.1103/PhysRevD.52.6612

The $D_s \rightarrow n \pi$ measured branching could lead to information on $u, d$ quark masses if it is dominated by the (helicity suppressed) $D_s \rightarrow u \bar d$ annihilation channel. The data would then suggest anomalously high $m_u \approx m_d \approx 30$MeV masses. We find however that $D_s \rightarrow u {\bar d} g$ can explain $\sum Br(D_s \rightarrow n \pi)$ with zero up and down quark masses. We also argue that the present $D_s \rightarrow n \pi$ data may not even convincingly imply any annihilation process whatsoever.

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