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arXiv 2103.11494hep-ph
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在三体衰变中产生GeV-scale重中性轻子。与PYTHIA方法的比较

Production of GeV-scale heavy neutral leptons in 3-body decays. Comparison with the PYTHIA approach

Volodymyr M. Gorkavenko, Yuliia R. Borysenkova, Mariia S. Tsarenkova

摘要:

尽管粒子物理学的标准模型取得了不可否认的成功,但仍有一些现象是标准模型无法解释的。这些现象表明,SM必须进行修改。扩展SM的一个可能的方法是引入重中性轻子(HNL)。在强度前沿实验中寻找HNL,必须考虑某些介子的二体和三体衰变中的HNL产生。我们验证了使用部分子水平PYTHIA缺省矩阵元(没有形状因子形式)计算HNL产生的可能性在3-体半轻子衰变的$B$和$D$介子在实验感兴趣的质量范围内产生的HNL。我们的结论是,这种方法是非常适合的估计的灵敏度区域的HNL在强度前沿实验,提供一个使用合适的部分子级PYTHIA默认矩阵元素。我们的研究是由SHiP合作使用这种近似驱动的。我们的结论是,在这种情况下,部分子级PYTHIA默认矩阵元素可以选择更合适。

英文摘要:

Despite the undeniable success of the Standard Model of particle physics (SM), there are some phenomena that the SM can't explain. These phenomena indicate that the SM has to be modified. One of the possible ways to extend the SM is to introduce heavy neutral leptons (HNLs). To search for HNLs in intensity frontier experiments, one has to consider HNL production both in 2-body and 3-body decays of some mesons. We verified the possibility of using the parton level PYTHIA default matrix elements (without the form-factor formalism) to calculate HNL production in 3-body semileptonic decays of $B$ and $D$ mesons in the experimentally interesting mass range of the produced HNLs. We conclude that this approach is quite suitable for the estimation of the sensitivity region for HNLs in the intensity frontier experiments, provided one uses suitable parton level PYTHIA default matrix elements. Our study was driven by the usage of such an approximation by the SHiP collaboration. We conclude that in this case the parton level PYTHIA default matrix elements could have been chosen more appropriately.

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