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arXiv 2112.03047hep-lat
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含扭曲质量价夸克的粲半轻子

Charmed semileptonics with twisted-mass valence quarks

Julien Frison, Gregorio Herdoiza, Carlos Pena, Jose Angel Romero, Javier Ugarrio

摘要:

我们的魅力计划使用的混合行动与扭转质量价夸克的非微扰改进威尔逊海夸克,为了研究各种数量在相对论性和明显的本地框架的完整QCD。海洋部门包括由CLS倡议产生的$N_\mathrm{f}=2+1$组合。利用开放的边界条件,这允许访问精细的合奏没有拓扑冻结。在这里,我们特别集中在我们目前的进展$D\to Kνl$和$D\to πνl$半轻子。这些对于CKM矩阵元素$|V_{cs}|$和$|V_{cd}|$的计算首先是有用的。我们表明,所有的离散化效果似乎是合理的控制与这种选择的行动,特别是那些相关的超立方晶格文物。最终,我们得到的初步结果的形状因子作为一个非常平滑的曲线上的整个范围内的动量转移,特别是在零$q^2$的信号似乎有可能与早期发表的结果具有竞争力。

英文摘要:

Our charm program uses a mixed action with twisted-mass valence quarks over non-perturbatively improved Wilson sea quarks, in order to study various quantities in a relativistic and manifestly local framework of full QCD. The sea sector consists of $N_\mathrm{f}=2+1$ ensembles generated by the CLS initiative. Taking advantage of open boundary conditions, this allows access to fine ensembles without topological freezing. Here we focus in particular on our current progress on $D\to Kνl$ and $D\to πνl$ semileptonics. Those are first and foremost useful for the computation of the CKM matrix elements $|V_{cs}|$ and $|V_{cd}|$. We show that all discretisation effects seem to be reasonably under control with this choice of action, in particular those related to hypercubic lattice artefacts. Eventually, we obtain preliminary results of the form factors as a very smooth curve on the whole range of momentum transfer, and in particular the signal at zero $q^2$ appears to have the potential to be competitive with earlier published results.

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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