Addendum to “Leptophilic U(1) massive vector bosons from large extra dimensions: Reexamination of constraints from LEP data” [Phys. Lett. B 820 (2021) 136585]
Addendum to “Leptophilic U(1) massive vector bosons from large extra dimensions: Reexamination of constraints from LEP data” [Phys. Lett. B 820 (2021) 136585]
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“来自大额外维度的亲Leptophilic U(1) 大规模矢量玻色子的附录：重新检查 LEP 数据的约束”[Phys.
DOI：
10.1016/j.physletb.2022.137014
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发表时间：
2022
影响因子：
4.4
通讯作者：
Taylor, Tomasz R.
中科院分区：
文献类型：
--
作者：
Anchordoqui, Luis A.;Antoniadis, Ignatios;Huang, Xing;Lüst, Dieter;Rondeau, François;Taylor, Tomasz R.
最近，我们提出了一种解释，解释了测量到的μ子的反常磁矩与标准模型（SM）预测之间的差异，在标准模型中，对（g− 2）μ的主要贡献来自于（轻子规范玻色子的）卡鲁扎-克莱因（KK）激发，这种激发不与夸克混合（到最低阶），因此可以非常轻，避免LHC的约束。在本附录中，我们重新审视的界限4费米子接触相互作用从精确的电弱测量，并表明，KK质量和耦合的约束比以前认为的更严重。然而，我们证明，我们的解释仍然是合理的，如果一些KK模式比LEP能量轻，因为如果是这种情况下的4-费米子散射的内部传播子的贡献将主要由能量，而不是由质量。为了适应（g− 2）μ的差异，我们假设轻子数L不参与超荷，并在一个额外的维度（横截SM膜）中传播：对于最低KK激发的质量为60 GeV（低于LEP能量），弦标度大约为10 TeV，而L规范耦合的量级为10 - 10 - 1。
Very recently, we proposed an explanation of the discrepancy between the measured anomalous magnetic moment of the muon and the Standard Model (SM) prediction in which the dominant contribution to (g− 2) μ originates in Kaluza-Klein (KK) excitations (of the lepton gauge boson) which do not mix with quarks (to lowest order) and therefore can be quite light avoiding LHC constraints. In this addendum we reexamine the bounds on 4-fermion contact interactions from precise electroweak measurements and show that the constraints on KK masses and couplings are more severe than earlier thought. However, we demonstrate that our explanation remains plausible if a few KK modes are lighter than LEP energy, because if this were the case the contribution to the 4-fermion scattering from the internal propagator would be dominated by the energy and not by the mass. To accommodate the (g− 2) μ discrepancy we assume that the lepton number L does not partake in the hypercharge and propagates in one extra dimension (transverse to the SM branes): for a mass of the lowest KK excitation of 60 GeV (lower than the LEP energy), the string scale is roughly 10 TeV while the L gauge coupling is of order∼ 10− 1.
影响因子：
5
作者：
K. Nakamura;K. Hagiwara;K. Hikasa;H. Murayama;M. Tanabashi;T. Watari;C. Amsler;M. Antonelli
通讯作者：
K. Nakamura;K. Hagiwara;K. Hikasa;H. Murayama;M. Tanabashi;T. Watari;C. Amsler;M. Antonelli