$c\to u\gamma$ in Cabibbo suppressed D meson radiative weak decays

Abstract

We investigate Cabibbo suppressed $D^0$, $D^{+}$ and $D_s^{+}$ radiative weak decays in order to find the best mode to test $c\to u\gamma$ decay. Combining heavy quark effective theory and the chiral Lagrangian approach we determine the decay widths. We calculate $\Gamma (D^0\to {\rho }^0/\omega \gamma )/\Gamma (D^0\to {\bar{K}}^{\ast 0}\gamma )$ previously proposed to search for possible New Physics. However, we notice that there are large, unknown, corrections within the Standard Model. We propose a better alternative, the ratio $\Gamma (D_s^{+}\to K^{\ast +}\gamma )/\Gamma (D_s^{+}\to {\rho }^{+}\gamma )$, and show that it is less sensitive to the Standard Model.

14 pages, latex, 2 uuencoded Postscript figures in a separate file

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• Chiral Lagrangians for Radiative Decays of Heavy Hadrons
• Radiative $D^{\ast }$ Decay Using Heavy Quark and Chiral Symmetry
• Two Body Non Leptonic Decays of B and B_s Mesons
• Electromagnetic Interactions in Heavy Hadron Chiral Theory
• Light Vector Resonances in the Effective Chiral Lagrangian for Heavy Mesons
• Radiative Weak Decays of Charm Mesons
• Corrections to Chiral Dynamics of Heavy Hadrons: (I) 1/M Correction
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Cited by in corpus (12)

• Rare Charm Decays in the Standard Model and Beyond
• $D^0-\overline{D^0}$ Mixing and Rare Charm Decays
• Lepton Flavor Violation in the Standard Model Extended by Heavy Singlet Dirac Neutrinos
• Rare charm meson decays D->Pl^+l^- and c->ul^+l^- in SM and MSSM
• $c\to u\gamma$ in the minimal supersymmetric standard model
• Long distance $c\to u\gamma$ effects in weak radiative decays of D-mesons
• Resonant and nonresonant contributions to the weak $D\to V{l}^{+}{l}^{-}$ decays
• Analysis of the semileptonic (B_c -> B_u* l+ l-) decay from QCD sum rules
• Measurement of the Branching Fractions of the Radiative Charm Decays $D^0\to {\bar{K}}^{\ast 0}\gamma$ and $D^0\to \varphi \gamma$
• Radiative Decay Modes of the $D^0$ Meson
• A Possible Arena for Searching New Physics - the $\Gamma (D^0\to {\rho }^0\gamma )/\Gamma (D^0\to \omega \gamma )$ Ratio
• Rare Charm Decays