Chiral Z' in FASER, FASER2, DUNE, and ILC beam dump experiments
Chiral Z' in FASER, FASER2, DUNE, and ILC beam dump experiments
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DOI：
10.1103/physrevd.106.095033
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发表时间：
2022
影响因子：
5
通讯作者：
Osamu Seto
中科院分区：
文献类型：
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作者：
Kento Asai;Arindam Das;Jinmian Li;Takaaki Nomura;Osamu Seto
中微子质量的起源是标准模型(SM)尚未解决的一个大问题，它促使我们超越标准模型(BSM)的情景，引入SM-单态右手中微子(RHN)来解释轻中微子质量的起源。有多种方法可以引导我们达到这个目标，其中之一是SM的一般U(1)扩展。在这个场景中，引入了三个SM-Singlet RHN来消除规范重力异常和混合规范重力异常。反常消除后，我们注意到左右手带电费米子在一般U(1)规范群下的电荷不同，演化为手征情形。在一般U(1)对称性破缺后，中性BSM规范玻色子获得质量，它是一个自由参数。这种轻于5GeV的粒子可以在强度和寿命边界上进行探测，如Faser、FASER2、沙丘和ILC束流倾倒实验。需要将估计的界限与现有的界限进行比较。我们发现，来自Orsay、Nomad、PS191、KEK、LSND、Charm实验和像SN1987A这样的宇宙学场景的现有约束可以在我们的情况下进行比较，只要对手性场景进行估计即可。最后，我们比较了FASER、FASER2、DUNE和ILC束流倾倒实验可以探测到的可行的参数空间，以及对于手性场景已经排除了Orsay、Nomad、PS191、KEK、LSND、Charm和SN1987A的区域。
The origin of neutrino mass is a big unsolved problem of the Standard Model (SM) that motivate us to consider beyond the SM (BSM) scenarios where SM-singlet right-handed neutrinos (RHNs) are introduced to explain the origin of the light neutrino masses through the seesaw mechanism. There is a variety of ways which could lead us to this goal, and one of them is a general U(1) extension of the SM. In this scenario, three SM-singlet RHNs are introduced to cancel the gauge and mixed gauge gravity anomalies. After anomaly cancellation, we notice that the left- and right-handed charged fermions are differently charged under the general U(1) gauge group evolving a chiral scenario. After the breaking of the general U(1) symmetry, a neutral BSM gauge bosonacquires mass, and it is a free parameter. Such, being lighter than 5 GeV, could be probed at the intensity and lifetime frontiers like FASER, FASER2, DUNE, and ILC beam dump experiments. The estimated bounds are needed to be compared with the existing bounds. We find that existing constraints from Orsay, Nomad, PS191, KEK, LSND, CHARM experiments, and cosmological scenario like SN1987A can be compared in our case once estimated for chiral scenarios. Finally, we compare the parameter spaces showing viable ones that could be probed by FASER, FASER2, DUNE, and ILC beam dump experiments and already excluded regions from Orsay, Nomad, PS191, KEK, LSND, CHARM, and SN1987A for a chiral scenario.