With the long-standing tension between experiment and Standard-Model (SM) prediction in the anomalous magnetic moment of the muon $a_μ$ recently reaffirmed by the Fermilab experiment, the crucial question becomes which other observables could be sensitive to the underlying physics beyond the SM to which $a_μ$ may be pointing. While from the effective field theory (EFT) point of view no direct correlations exist, this changes in specific new physics models. In particular, in the case of explanations involving heavy new particles above the electroweak (EW) scale with chiral enhancement, which are preferred to evade exclusion limits from direct searches, correlations with other observables sensitive to EW symmetry breaking are expected. Such scenarios can be classified according to the $SU(2)_L$ representations and the hypercharges of the new particles. We match the resulting class of models with heavy new scalars and fermions onto SMEFT and study the resulting correlations with $h\toμμ$ and $Z\toμμ$ decays, where, via $SU(2)_L$ symmetry, the latter process is related to $Z\toνν$ and modified $W$-$μ$-$ν$ couplings.
Chirally enhanced corrections to FCNC processes in the generic MSSM
Chirally enhanced supersymmetric QCD corrections to FCNC processes are investigated in the framework of the MSSM with generic sources of flavor violation. These corrections arise from flavor-changing self-energy diagrams and can be absorbed into a finite renormalization of the squark-quark-gluino vertex. In this way enhanced two-loop and even three-loop diagrams can be efficiently included into a leading-order (LO) calculation. Our corrections substantially change the values of the parameters delta^{d,LL}_{23}, delta^{d,LR}_{23}, delta^{d,RL}_{23}, and delta^{d,RR}_{23} extracted from Br[B->X_…
Testing selectively enhanced QCD axions couplings as an explanation of the RX J1856.5-3754 hard X-ray excess
Birla Institute of Technology and Science - Pilani（比拉理工学院皮拉尼分校）；Birla Institute of Technology and Science Pilani, K. K. Birla Goa Campus（比拉理工学院皮拉尼分校K.K.比尔拉果阿校区）
研究利用 QCD 轴子转换光子解释壮丽七颗中子星之一的硬 X 射线数据，采用核子 - 核子轫致辐射及库珀对破坏与形成过程，对比常用模型，发现微电子伏特尺度增强模型更吻合数据，可解释 2 - 8 千电子伏特硬 X 射线发射。
