Interpretation of the "$f_{D_s}$ puzzle" in SM and beyond

Abstract

The recent measurement on the decay constant of $D_s$ shows a discrepancy between theory and experiment. We study the leptonic and semileptonic decays of $D$ and $D_s$ simultaneously within the standard model by employing a lightfront quark model. There is space by tuning phenomenological parameters which can explain the "$f_{D_s}$ puzzle" and do not contradict other experiments on the semileptonic decays. We also investigate the leptonic decays of D and $D_s$ with a new physics scenario, unparticle physics. The unparticle effects induce a constructive interference with the standard model contribution. The nontrivial phase in unparticle physics could produce direct CP violation which may distinguish it from other new physics scenarios.

16 pages, 6 figures, be accepted by PRD

References in corpus (16)

• Unparticle Physics
• Another Odd Thing About Unparticle Physics
• High Precision determination of the pi, K, D and D_s decay constants from lattice QCD
• Collider signals in unparticle physics
• Comments on Unparticles
• Bounds on Unparticles from the Higgs Sector
• Accumulating evidence for nonstandard leptonic decays of D_s mesons
• Heavy-to-light form factors on the light cone
• Unparticle Physics Effects on D0-anti-D0 Mixing
• Diquarks and Λ_{b}\toΛ_c weak decays
• SUSY Unparticle and Conformal Sequestering
• Unparticles at heavy flavour scales: CP violating phenomena
• Effect of H^\pm on B^\pm\to τ^\pmν_τand D^\pm_s\to μ^\pmν_μ,τ^\pmν_τ
• Neutrino decay as a possible interpretation to the MiniBooNE observation with unparticle scenario
• Direct CP violation of $B\to l\nu$ in unparticle physics
• A Possibility of Search for New Physics at LHCb