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arXiv 1007.2496hep-ph
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B_s(d)- bar B_s(d)混合约束对t和b夸克变味衰变的影响

B_s(d) - bar B_s(d) mixing constraints on flavor changing decays of t and b quarks

Amand Faessler, Thomas Gutsche, Sergey Kovalenko, Valery E. Lyubovitskij, Ivan Schmidt

摘要:

我们研究了产生第三代夸克的变味夸克-胶子跃迁的6维有效算符,其中t -> g + u(c)和b -> g + d(s)是LHC实验中感兴趣的。我们分析了这些算符对B_s(d)-棒B_s(d)混合的贡献,并从已有的实验数据中导出了相应的有效耦合的极限。标准模型规范不变性将这些耦合与控制t -> g + u(c)的耦合联系起来。在此基础上,我们得到了这些过程的分支比的上限。我们进一步表明,即将到来的大型强子对撞机实验可能能够探测所研究的运营商和物理超越标准模型与他们有关。

英文摘要:

We study those dimension 6 effective operators which generate flavor-changing quark-gluon transitions of the third generation quarks, with t -> g + u(c) and b -> g + d(s), and which could be of interest for LHC experiments. We analyze the contribution of these operators to B_s(d) - bar B_s(d) mixing and derive limits on the corresponding effective couplings from the existing experimental data. The Standard Model gauge invariance relates these couplings to the couplings controlling t -> g + u(c). On this basis we derive upper limits for the branching ratios of these processes. We further show that forthcoming LHC experiments might be able to probe the studied operators and the physics beyond the Standard Model related to them.

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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