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arXiv 2002.01978hep-phhep-ex
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在LHC上产生同号双轻子的CP破坏

CP Violation in Same-sign Dilepton Production at the LHC

Fatemeh Najafi, Jacky Kumar, David London, Richard MacKenzie

摘要:

如果中微子是马约拉纳粒子,那么低能轻子数破坏(LNV)过程,例如无中微子双β($0νββ$)衰变,是可能的。在大型强子对撞机上也有可能观测到类似高能$0νββ$的LNV过程。它们的区别在于在最终状态下存在相同符号的双轻子(例如,${\bar u} d \to t {\bar b} \, e^- μ^-$)。在本文中,我们表明,CP违反三重产品(TP)可能存在于该过程中,并可能在LHC可测量。如果观测到非零的TP,它将为我们提供关于潜在的新物理学(NP)的许多信息。我们会知道(至少)有两个相互干扰的NP振幅,它们具有不同的弱相位和不同的洛伦兹结构。如果我们对NP有一些了解,例如,通过直接产生NP粒子,我们可以得到关于其耦合的大小和相对相位的信息。

英文摘要:

If the neutrino is a Majorana particle, low-energy lepton-number-violating (LNV) processes, such as neutrinoless double-beta ($0νββ$) decay, are possible. It may also be possible to observe high-energy $0νββ$-like LNV processes at the LHC. These are distinguished by the presence of same-sign dileptons in the final state (e.g., ${\bar u} d \to t {\bar b} \, e^- μ^-$). In this paper, we show that CP-violating triple products (TPs) may be present in the process, and may be measurable at the LHC. If a nonzero TP were observed, it would give us much information about the underlying new physics (NP). We would know that there are (at least) two interfering NP amplitudes, with different weak phases and different Lorentz structures. And if we had some knowledge of the NP, e.g., by direct production of NP particles, we could get information about the magnitudes and relative phases of its couplings.

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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