We propose that the γ +E / signal at the Belle-II detector will be a smoking gun for supersymmetry (SUSY) in the presence of a gauged U (1)L µ−Lτ symmetry. A striking consequence of breaking the enhanced symmetry appearing in the limit of degenerate (s)leptons is the nondecoupling of the radiative contribution of heavy charged sleptons to the γ − Z kinetic mixing. The signal process, e + e − → γZ → γ + E / , is an outcome of this ubiquitous feature. We take into account the severe constraints on gauged U (1)L µ−Lτ models by several low-energy observables and show that any significant excess in all but the highest photon energy bin would be an undeniable signature of such heavy scalar fields in SUSY coupling to Z . The number of signal events depends crucially on the logarithm of the ratio of stau to smuon mass in the presence of SUSY. In addition, the number is also inversely proportional to the e + − e − collision energy, making a low-energy, high-luminosity collider like Belle-II an ideal testing ground for this channel. This process can probe large swathes of the slepton mass ratio vs the additional gauge coupling (gX ) parameter space. More importantly, it can explore the narrow slice of M Z − gX parameter space still allowed in gauged U (1)L µ−Lτ models for superheavy sparticles. * Electronic address: tphb@iacs.res.in † Electronic address: tpsr@iacs.res.in 1 Note that it is sufficient to consider kinetic mixing between U (1)em and the U (1) Lµ−Lτ as long as M 2 Z /M 2 Z 1.
The gauged U (1)L µ−Lτ model can provide for additional contributions to the muon anomalous magnetic moment by means of a loop involving the Z gauge boson. However, the parameter space of such models is severely constrained if one combines the latest muon (g − 2) data with various neutrino experiments, such as neutrino trident production, ν − e and ν − q elastic scattering, etc. In a supersymmetric U (1)L µ−Lτ model, a larger region of parameter space opens up, thus enabling one to explore otherwise forbidden regions of parameter space in nonsupersymmetric models involving the new gauge coupling (gX ) and the mass of the Z gauge boson (M Z ) . We show that the minimal model with the minimal supersymmetric Standard Model (MSSM) field content is strongly disfavored from Z-boson decay and neutrino data. We also show that the nonminimal model with two extra singlet superfields can lead to correct neutrino masses and mixing involving both tree-level and one-loop contributions. We find that, in this model, both muon (g − 2) and neutrino data may be simultaneously explained in a parameter region consistent with experimental observations. In addition, we observe that the muon (g − 2) anomaly can be accommodated even with higher values of electroweak sparticle masses compared to the MSSM. Charged lepton-flavorviolating processes (like µ → eγ, τ → µγ, etc.) may have potentially large branching ratios in this scenario. Depending on the magnitude of the supersymmetry contribution to these processes, they may constrain hitherto unconstrained regions of the M Z − gX parameter space. However, we find that these branching fractions never exceed their upper bounds in a region where both muon (g − 2) and neutrino oscillation data can be simultaneously accommodated. arXiv:1805.04415v2 [hep-ph] 5 Nov 2018 c eLµÊ c µLτÊ c τĤuĤd U (1)L µ−Lτ 0 0 0 0 0 1 -1 -1 1 0 0
Minimal gauged $$ \mathrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ U 1 L μ − L τ models can provide for an additional source for the muon anomalous magnetic moment however it is difficult to accommodate the discrepancy in the electron magnetic moment in tandem. Owing to the relative sign between the discrepancies in these quantities, it seems unlikely that they arise from the same source. We show that a supersymmetric (SUSY) gauged $$ \mathrm{U}{(1)}_{L_{\mu }-{L}_{\tau }} $$ U 1 L μ − L τ model can accommodate both the muon and electron anomalous magnetic moments in a very simple and intuitive scenario, without utilizing lepton flavor violation. The currently allowed parameter space in this kind of a scenario is constrained from the latest LHC and various low energy experimental data,e.g., recent COHERENT data, CCFR, Borexino, BaBaR, supernova etc. These constraints, in conjunction with the requirement to explain both lepton magnetic moments, lead to an upper bound on the first generation slepton mass, a lower bound on the second generation slepton mass and constricts the allowed range for the new gauge boson mass and coupling. The scheme can be probed at the ongoing COHERENT and Coherent CAPTAIN-Mills experiments and at future experiments, e.g., DUNE, BELLE-II etc.
The Dark Matter Data Center (DMDC) is an ORIGINS Excellence Cluster initiative, supported by the Max Planck Computation and Data Facility. It aims at bringing together the large amount of recorded data and theories pertaining to Dark Matter (DM) research in a unified platform, making it easily accessible for the community. The DMDC offers a repository where data, methods and code are clearly presented in a unified interface for comparison, reproduction, combination and analysis. It is a forum where Experimental Collaborations can directly publish their data and Phenomenologists the implementation of their models, in accordance to Open Science principles. Alongside the repositories, it also offers easy online visualization of the hosted data. It offers an online simulation of signal predictions for experiments using model data supplied by the users, all in a friendly web-based GUI. The DMDC also hosts guidance tools from the Collaborations illustrating the usage and analysis of their data through Binders that run online and support all popular programming platforms. It hosts a continuously growing compendium of ready-to-use, copy-pastable code examples for inference and simulations. It can also provide support and computational power for comparison of model and experimental observations as well as the combination of these results using modern and robust statistical tools through similar Binders.
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