In sharp contrast to its classical counterpart, quantum measurement plays a fundamental role in quantum mechanics and blurs the essential distinction between the measurement apparatus and the objects under investigation. An appealing phenomenon in quantum measurements, termed as quantum Zeno effect, can be observed in particular subspaces selected by measurement Hamiltonian. Here we apply the top-down Zeno mechanism to the particle physics. We indeed develop an alternative insight into the properties of fundamental particles, but not intend to challenge the Standard Model (SM). In a unified and simple manner, our effective model allows to merge the origin of neutrino's small mass and oscillations, the hierarchy pattern for masses of electric charged fermions, the color confinement, and the discretization of quantum numbers, using a perturbative theory for the dynamical quantum Zeno effect. Under various conditions for vanishing transition amplitudes among particle eigenstates in the effective model, it is remarkable to probe results that are somewhat reminiscent of SM, including: (i) neutrino oscillations with big-angle mixing and small masses emerge from the energy-momentum conservation, (ii) electrically-charged fermions hold masses in a hierarchy pattern due to the electric-charge conservation, (iii) color confinement and the associated asymptotic freedom can be deduced from the color-charge conservation. We make several anticipations about the basic properties for fundamental particles: (i) the total mass of neutrinos and the existence of a nearly massless neutrino (of any generation), (ii) the discretization in quantum numbers for the new-discovered electrically-charged fermions, (iii) the confinement and the associated asymptotic freedom for any particle containing more than two conserved charges.
The B -> pi pi, pi K Puzzles: Implications for Hadron Physics, New Physics and Rare Decays
B介子系统是探索强相互作用、标准模型的夸克味部分和寻找新物理的有趣探针。在这个计划中，非轻子B衰变，从QCD的角度来看特别具有挑战性，起着关键作用。在讨论了处理四夸克算符对应的强子矩阵元的策略和新物理在B衰变中表现出来的流行途径之后，我们专注于B -> pi pi，pi K衰变的B工厂数据中令人困惑的模式;我们探索了它们对强子物理，新物理和罕见的K和B衰变的影响。
Strictly solvable $d=4$ quantum field theory models with unitarity violation. Possible implications for baryon asymmetry of the Universe and dark matter
Institute for Nuclear Research RAS（俄罗斯科学院核物理研究所）；JINR Dubna（杜布纳联合核研究所）
I show that breaking $B-L$ by one unit of this charge is suitable for neutrino mass generation through an inverse seesaw mechanism, stabilizing a dark matter candidate without supersymmetry, as well as solving the muon anomalous magnetic moment and the $W$ mass deviation via dark field contributions. The new physics is governed by the residual $Z_3$ symmetry of $B-L$ isomorphic to the center of the color group, instead of the well-studied matter parity.
Future precision measurements of the Standard Model (SM) parameters at the proposed Z-factories and Higgs factories may have significant impacts on new physics beyond the Standard Model (BSM). We illustrate this by focusing on the Type-II two Higgs doublet model. A multi-variable global fitting is performed with full one loop contributions to relevant couplings. The Higgs signal strength measurements at proposed Higgs factories can provide strong constraints on new physics and are found to be complementary to the Z-pole measurements.
Quantum gravity places important consistency conditions on low-energy effective field theory, such as the absence of global symmetries. These may have important consequences in the search for particle physics beyond the Standard Model. We review some of these conditions and their phenomenological implications for the strong CP problem, the weak scale, new gauge interactions, and cosmology. We also offer some general comments on how these ideas can guide model building.
Prompted by the recent Dresden-II reactor data we examine its implications for the determination of the weak mixing angle, paying attention to the effect of the quenching function. We also determine the resulting constraints on the unitarity of the neutrino mixing matrix, as well as on the most general type of nonstandard neutral-current neutrino interactions.
We give theoretical predictions for the radio emission of a dark matter candidate annihilating into 2-lepton and 4-lepton final states. We then compare our results with the known radio measurements of the sky temperature as a function of the frequency. In particular, we calculate the radio emission for some dark matter candidates annihilating into intermediate bosons that subsequently decay into a 4-lepton channel with a thermal annihilation cross-section. We show that within the range of frequencies from $20\,{\rm MHz}$ to $5\,{\rm GHz}$, this channel can produce a stronger signature than dir…
The b --> s l^+ l^- anomalies and their implications for new physics
最近，大型强子对撞机在排他的半轻子b -> s l^+ l^-衰变中发现了几个反常现象。在这一过程中，我们总结了我们的相关衰变模式的全球分析的最重要的结果。在讨论了进入理论预测的强子不确定性之后，我们提出了一种通用的新物理场景的数据解释。为此，我们对数据进行了相应威尔逊系数的模型独立拟合，并发现在某些情况下，最佳拟合点优于标准模型，全局显著性超过4σ。在此基础上，讨论了高尺度新物理与低能QCD效应的区别以及轻子味普适性破坏的可能性。
We study the semileptonic decays of the $B_c$ meson into final charmonium states within the standard model and beyond. The relevant hadronic transition form factors are calculated in the framework of the covariant confined quark model developed by us. We focus on the tau mode of these decays, which may provide some hints of new physics effects. We extend the standard model by assuming a general effective Hamiltonian describing the $b\to cτν$ transition, which consists of the full set of the four-fermion operators. We then obtain experimental constraints on the Wilson coefficients corresponding…
