Interpretation of the “fDspuzzle” in the standard model and beyond

2009/05/31 by Zheng-Tao Wei, Hong-Wei Ke, Xiaofeng Yang +1
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph

paper · pdf · doi:10.1103/physrevd.80.015022

published as Phys.Rev.D80:015022,2009 · 16 pages, 6 figures, be accepted by PRD

arxiv created 2009/07/27 · openalex publication_date 2009/07/29 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/28

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 light-front 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.

Citations

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