Study on the Effects of the Light CP-odd Higgs via the Leptonic Decays of Pseudoscalar Mesons  

作　　者：汤亮 柯红卫 李学潜 

机构地区：[1]School of Physics,Nankai University [2]School of Science,Tianjin University

出　　处：《Communications in Theoretical Physics》2012年第11期732-738,共7页理论物理通讯（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos.11075079and11005079;the Special Grant for the Ph.D.Program of Ministry of Eduction of China No.20100032120065

摘　　要：To explain the anomALously large decay rate of ∑＋→p＋μ＋μ-, it was proposed that a new mechanism where a light CP-odd pseudoscaJar boson of mAo = 214.3 MeV makes a crucial contribution. Later, some authors have studied the transition π0→e＋e- and γ→γA10 in terms of the same mechanism and their result indicates that with the suggested mass one cannot fit the data. This discrepancy might be caused by experimental error of ∑＋→p＋μ＋μ- because there were only a few events. Whether the mechanism is a reasonable one motivates us to investigate the transitions π0→e＋e-;η（η′）→μ＋μ-;ηc→μ＋μ-;ηb→τ＋τ- within the same framework. It is noted that for π0→ e＋ e-, the standard model （SM） prediction is smaller than the data, whereas the experimental central value of η→μ＋μ- is also above the SM prediction. It means that there should be extra contributions from other mechanisms and the contribution of A may be a possible one. Theoretically calculating the branching ratios of the concerned modes, we would cheek if we can obtain a univers mass for A10 which reconcile the theoretical predictions and data for all the modes. Unfortunately, we find that it is impossible conclude that the phenomenology does not favor such a to have such a mass with the same coupling｜gt｜. Therefore we light A10, even though a small window is still open.

关 键 词：supersymmetric Higgs bosons supersymmetric models leptonic decays of pseudoscalar mesons 

分 类 号：O572.33[理学—粒子物理与原子核物理]