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arXiv hep-ph/0209049hep-ph
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粲介子的CP破坏和混合

CP-violation and mixing in charmed mesons

Alexey A Petrov

摘要:

标准模型对D 0-反D 0混合的贡献主要由轻s和d夸克的贡献所决定。在SU(3)_F对称性的极限下,忽略b夸克的微小影响,质量和寿命的差别都消失了。因此,在标准模型中计算D 0-反D 0系统的质量和宽度差的主要挑战是估计SU(3)破缺效应的大小。我们证明了在标准模型中,D介子混合只发生在SU(3)破坏的二阶。我们认为相空间效应可能是SU(3)破缺的主要来源。我们发现,在标准模型中,y=(ΔΓ)/(2Γ)为百分之一的量级是自然的,这可能会降低D介子混合测量对新物理的敏感性.我们还讨论了在目前运行和拟议的设施中观测粲介子寿命差异和CP破坏的可能性。

英文摘要:

The Standard Model contribution to D0-anti-D0 mixing is dominated by the contributions of light s and d quarks. Neglecting the tiny effects due to b quark, both mass and lifetime differences vanish in the limit of SU(3)_F symmetry. Thus, the main challenge in the Standard Model calculation of the mass and width difference in the D0-anti-D0 system is to estimate the size of SU(3) breaking effects. We prove that D meson mixing occurs in the Standard Model only at second order in SU(3) violation. We consider the possibility that phase space effects may be the dominant source of SU(3) breaking. We find that y=(ΔΓ)/(2Γ) of the order of one percent is natural in the Standard Model, potentially reducing the sensitivity to new physics of measurements of D meson mixing. We also discuss the possibility of observing lifetime differences and CP violation in charmed mesons both at the currently operating and proposed facilities.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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