Implications of D0- ¯D0 Mixing for New Physics
Implications of D0- ¯D0 Mixing for New Physics
复制标题
D0- ́D0 混合对新物理学的影响
DOI：
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发表时间：
2007
期刊：
影响因子：
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通讯作者：
A. Petrov
中科院分区：
文献类型：
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作者：
E. Golowich;J. Hewett;S. Pakvasa;A. Petrov
我们对新物理可能对D⁰ - D⁰混合中的质量差∆MD所做的贡献进行了全面且最新的分析。我们考虑了最一般的低能有效哈密顿量，并包含了有效算符的领头阶量子色动力学（QCD）跑动。然后，我们探究了一长串可能产生这些算符的新物理模型，我们将其分类为包含额外费米子、额外规范玻色子、额外标量、额外空间维度以及额外对称性。对于每个模型，我们利用近期观测到D介子混合的证据对允许的参数空间加以限制。在许多情形下，我们发现了比其他搜索技术更强的约束条件，并且为上夸克部分的味改变中性流提供了一项重要检验。我们还回顾了近期BaBar和Belle的研究结果，并描述了标准模型对D⁰ - D⁰混合预测的现状。
We provide a comprehensive, up-to-date analysis of possible New Physics contributions to the mass difference ∆MD in D 0-D 0 mixing. We consider the most general low energy effective Hamiltonian and include leading order QCD running of effective operators. We then explore an extensive list of possible New Physics models that can generate these operators, which we organize as including Extra Fermions, Extra Gauge Bosons, Extra Scalars, Extra Space Dimensions and Extra Symmetries. For each model we place restrictions on the allowed parameter space using the recent evidence for observation of D meson mixing. In many scenarios, we find strong constraints that surpass those from other search techniques and provide an important test of flavor changing neutral currents in the up-quark sector. We also review the recent BaBar and Belle findings, and describe the current status of the Standard Model predictions of D0-D 0 mixing.