2012/09/01 by Rong, Gang · 1 citation
Physics and Astronomy · Computer Science · #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #Computational Physics and Python Applications
paper · pdf · doi:10.48550/arxiv.1209.0085
In the last 25 years, many e+e- experiments and fixed-target experiments performed to search for and study the leptonic decays of the D+ and D+s mesons. By 2012, more than 530 signal events of the D+ leptonic decays and about 4×103 signal events of the D+s leptonic decays have been accumulated at these experiments. With these leptonic decay signal events, both decay constants fD+ and fDs+ are, respectively, measured at an accuracy level of 2.4% and 1.6%, which can be used to more precisely test the LQCD calculations of the decay constants. Comparing these precisely measured fD+ and fDs+ with those predicted with theories based on QCD provides some information about New Physics beyond the Standard Model. In addition to these, with the measured branching fractions for D+→ l+ν and Ds+→ l+ν decays, the CKM matrix elements |V\rm cd| and |V\rm cs| can be determined. Comparing these |V\rm cd| and |V\rm cs| to those determined from the CKMfitter or extracted from D meson semileptonic decays can also provide some information about the New Physics. In this article, we review and report the results on the leptonic decays of D+ and D+s mesons measured at different experiments. For the results which have already been published, we review these in shorter summaries, while for the results which have not been published or have not been reported yet before we report these with more detailed discussion.