Scalar leptoquark and vector-like quark extended models as the explanation of the muon g-2 anomaly:bottom partner chiral enhancement case

Leptoquark(LQ)models are well motivated solutions to the(g-2)_(μ)anomaly.In the minimal LQ models,only specific representations can lead to chiral enhancements.For the scalar LQs,R_(2)and S_(1)can lead to the top quark chiral enhancement.For the vector LQs,V_(2)and U_(1)can lead to the bottom quark chiral enhancement.When we consider the LQ and vector-like quark(VLQ)simultaneously,there can be more scenarios.In our previous study,we considered the scalar LQ and VLQ extended models with up-type quark chiral enhancement.Here,we study the scalar LQ and VLQ extended models with down-type quark chiral enhancement.We find two new models with B quark chiral enhancements,which originate from the bottom and bottom partner mixing.Then,we propose new LQ and VLQ search channels under the constraints of(g-2)_(μ).

Part I: Explaining the “Muon g - 2” Results with Probabilistic Spacetime

A recent experimental finding replicated an earlier research result, both of which demonstrated conflict with a specific Standard Model prediction. The “Muon g - 2” studies have indicated that the degree of muon precession predicted by the Model is not the same as observed. The researchers offer many posteriori atheoretical hypotheses as possible explanations of their findings, but no fundamental theoretical understanding of the near discovery is among them. This article describes both an explication for the unexpected result and describes its underlying mechanism based on an existing cosmological theory, the Probabilistic Spacetime Theory. The paper also discusses the potential value of this theory.

Influence of low-energy supersymmetric vector-like quirk particles on W mass increment and muon g–2 anomaly

In the low energy realization of the quirk assisted Standard Model,the couplings between the exotic particles"quirks"and gauge bosons may contribute to the W mass and muon g−2 anomaly reported by FermiLab.We calculate the contributions from supersymmetric quirk particles as an example.By imposing the theoretical constraints,we determined that the CDF II W-boson mass increment strictly constrains the mixing and coupling parameters and the quirk mass mF,while the muon g−2 anomaly cannot be solely attributed to the involvement of exotic particles,considering their significantly large masses.

NMSSM neutralino dark matter for CDFⅡW-boson mass and muon g-2 and the promising prospect of direct detection

Two experiments from the Fermilab, E989 and CDF II, have reported two anomalies for muon g-2 and W-boson mass that may indicate the new physics at the low energy scale. Here we examine the possibility of a common origin of these two anomalies in the Next-to-Minimal Supersymmetric Standard Model. Considering various experimental and astrophysical constraints such as the Higgs mass, collider data, flavor physics, dark matter relic density, and direct detection experiments, we find that lighter electroweakinos and sleptons can generate sufficient contributions to muon g-2 and mW. Moreover, the corresponding bino-like neutralino dark matter mass is in the ~ 180-280 Ge V range. Interestingly, the favored dark matter(DM) mass region can soon be entirely probed by ongoing direct detection experiments like Panda X-4T, XENONn T, LUX-ZEPLIN, and DARWIN.

Leptoquark and vector-like quark extended model for simultaneous explanation of W boson mass and muon g–2 anomalies

The CDF collaboration recently announced a new measurement result for the W boson mass,and it is in tension with the standard model prediction.In this paper,we explain this anomaly in the vector-like quark(VLQ)(X,T,B)_(L,R)and leptoquark(LQ)S_(3)extended model.In this model,both the VLQ and LQ have positive corrections to the W boson mass.Moreover,it may be a solution to the(g-2)_(μ)anomaly because of the chiral enhancements from top,T,and B quarks.

Smuon in the NMSSM confronted with the muon g–2 anomaly and SUSY searches

Motivated by recent supersymmetry(SUSY)search results,which prefer most SUSY particles to be heavy,and the muon g–2 anomaly,which prefers colorless SUSY particles to be light,we explore the status of a light smuon(the SUSY partner of a left-handed muon lepton)in the next-to-minimal supersymmetric standard model(NMSSM).Assuming colored SUSY particles to be heavy,and considering numerous experimental constraints,including muon g-2,SUSY searches,and dark matter,we scan the parameter space in the NMSSM with Z3-symmetry and check the status of colorless SUSY particles and their possible mass order,paying special attention to the smuon.After calculations and discussions,we find that the surviving samples can be divided into several scenarios,where the mass region and decay information of the smuon are given.Overall,the smuon mass can be approximately 0.1~1.8 TeV.These results may be useful for smuon searches at the LHC and future colliders.

New results on the hadronic vacuum polarization contribution to the muon g-2

Results on the lowest-order hadronic vacuum polarization contribution to the muon magnetic anomaly are presented. They are based on the latest published experimental data used as input to the dispersion integral. Thus recent results on τ→υτππ^0 decays from Belle and on e^＋e^- annihilation to π^＋π^- from BABAR and KLOE are included. The new data, together with improved isospin-breaking corrections for τ decays, result into a much better consistency among the different results. A discrepancy between the Standard Model prediction and the direct g- 2 measurement is found at the level of 3σ.

Probing the flavor-specific scalar mediator for the muon(g-2)deviation, the proton radius puzzle and the light dark matter production

Flavor-specific scalar bosons exist in various Standard Model extensions and couple to a single generation of fermions via a global flavor symmetry breaking mechanism. Given this strategy, we propose a Me V flavor-specific scalar model in dimension-5 operator series, which explains the muon g-2 anomaly and proton radius puzzle by coupling with the muon and down-quark at the same time. The framework is consistent with the null result of high-intensity searches. Specifically, the supernova constraints for muon couplings become weakened by including the contribution of down-quark interaction. The parameter space for explaining muon g-2 discrepancy is available when 10% energy deposition is required in the energy explosion process in the supernova,but this is ruled out by the 1% energy deposition requirement. We also investigate the searches for mediator and dark matter and the resulting constraints on viable parameter space such as nuclear physics constraints, direct detection for light boosted dark matter, and possible CMB constraints. When compared with conventional dark matter production, light dark matter production has two additional modifications: bound state formation and early kinetic equilibrium decoupling. We are now looking into the implications of these effects on the relic density of light dark matter.

次超对称模型下谬轻子g-2反常,银心GeV超和AMS-02反质子超的共同起源

超对称模型是最受关注的新物理模型之一.最近Fermi实验室E989实验以更高置信度报道了谬轻子g-2反常,此前Fermi-LAT观测到银河系中心的伽马射线超出,AMS-02的反质子数据中也存在超出的迹象.本文指出,在次超对称模型下这3种反常可以得到自洽的解释.在详细考虑了希格斯质量、B物理、对撞机、暗物质残留密度和暗物质直接探测等限制之后,作者发现暗物质粒子的质量约为60 Ge V.另外,文章特别指出,该参数区间可被正在开展的暗物质直接探测实验有效地予以检验.

Connecting muon anomalous magnetic moment and multi-lepton anomalies at LHC

In a previous paper by several of the authors a number of predictions were made in a study pertaining to the anomalous production of multiple leptons at the Large Hadron Collider(LHC). Discrepancies in multi-lepton final states have become statistically compelling with the available Run 2 data. These could be connected with a heavy boson, H, which predominantly decays into a standard model Higgs boson, h, and a singlet scalar, S, where mH≈270 GeV and mS≈150 GeV. These can then be embedded into a scenario where a two-Higgs-doublet is considered with an additional singlet scalar, 2HDM+S. The long-standing discrepancy in the muon anomalous magnetic moment,△aμ, is interpreted in the context of the 2HDM+S type-II and type-X, along with additional fermionic degrees of freedom. The 2 HDM+S model alone, with constraints from the LHC data, does not seem to explain the △aμ anomaly.However, adding fermions with mass of order O(100) GeV can explain the discrepancy for sufficiently low values of fermion-scalar couplings.

Fixed point and anomaly mediation in partial N=2 supersymmetric standard models

Motivated by the simple toroidal compactification of extra-dimensional SUSY theories, we investigate a partial N =2 supersymmetric（SUSY） extension of the standard model which has an N =2 SUSY sector and an N =1 SUSY sector. We point out that below the scale of the partial breaking of N = 2 to N = 1, the ratio of Yukawa to gauge couplings embedded in the original N =2 gauge interaction in the N =2 sector becomes greater due to a fixed point. Since at the partial breaking scale the sfermion masses in the N = 2 sector are suppressed due to the N = 2 non-renormalization theorem, the anomaly mediation effect becomes important. If dominant, the anomaly-induced masses for the sfermions in the N = 2 sector are almost UV-insensitive due to the fixed point. Interestingly, these masses are always positive, i.e. there is no tachyonic slepton problem. From an example model, we show interesting phenomena differing from ordinary MSSM. In particular, the dark matter particle can be a sbino, i.e. the scalar component of the N = 2 vector multiplet of U（1）_Y. To obtain the correct dark matter abundance, the mass of the sbino, as well as the MSSM sparticles in the N =2 sector which have a typical mass pattern of anomaly mediation, is required to be small. Therefore, this scenario can be tested and confirmed in the LHC and may be further confirmed by the measurement of the N = 2 Yukawa couplings in future colliders. This model can explain dark matter, the muon g-2 anomaly, and gauge coupling unification, and relaxes some ordinary problems within the MSSM. It is also compatible with thermal leptogenesis.

X(16.7) as the solution of the NuTeV anomaly

A recent experimental study of excited8 Be decay to its ground state revealed an anomaly in the angular distribution of the final states. This exceptional result is attributed to a new vector gauge boson X（16.7）. We study the significance of this new boson, especially its effect in anomalies observed in long-lasting experimental measurements.By comparing the discrepancies between the Standard Model predictions and the experimental results, we find the values and regions of the couplings of X（16.7） to the muon and muon neutrino. In this work, we find that the newly observed boson X（16.7） may be the solution of both the Nu Te V anomaly and the（g-2）μ puzzle.