We perform a model-independent investigation of spin and chirality correlation effects in the antler-topology processes $e^+e^-\to\mathcal{P}^+\mathcal{P}^-\to (\ell^+ \mathcal{D}^0) (\ell^-\mathcal{\bar{D}}^0)$ at high energy $e^+e^-$ colliders with polarized beams. Generally the production process $e^+e^-\to\mathcal{P}^+\mathcal{P}^-$ can occur not only through the $s$-channel exchange of vector bosons, $\mathcal{V}^0$, including the neutral Standard Model (SM) gauge bosons, $γ$ and $Z$, but also through the $s$- and $t$-channel exchanges of new neutral states, $\mathcal{S}^0$ and $\mathcal{T}^0$, and the $u$-channel exchange of new doubly-charged states, $\mathcal{U}^{--}$. The general set of (non-chiral) three-point couplings of the new particles and leptons allowed in a renormalizable quantum field theory is considered. The general spin and chirality analysis is based on the threshold behavior of the excitation curves for $\mathcal{P}^+\mathcal{P}^-$ pair production in $e^+e^-$ collisions with longitudinal and transverse polarized beams, the angular distributions in the production process and also the production-decay angular correlations. In the first step, we present the observables in the helicity formalism. Subsequently, we show how a set of observables can be designed for determining the spins and chiral structures of the new particles without any model assumptions. Finally, taking into account a typical set of approximately chiral invariant scenarios, we demonstrate how the spin and chirality effects can be probed experimentally at a high energy $e^+e^-$ collider.
Determining the Chirality of Yukawa Couplings via Single Charged Higgs Boson Production in Polarized Photon Collision
当带电的希格斯玻色子太重而不能成对产生时，线性对撞机的主要生产机制是通过单电荷的希格斯玻色子生产过程，如$e^-e^+ \to b \bar c H^+, τ\bar νH^+$和$γγ\to b \bar c H^+, τ\bar νH^+$。结果表明，在$γγ$对撞机上重荷希格斯玻色子的产额通常比在$e^-e^+$对撞机上大一到两个数量级.此外，极化的$γγ$对撞机可以确定费米子与带电希格斯玻色子通过单电荷希格斯玻色子产生的汤川耦合的手征性，从而区分新物理模型。
The phase space of visible particles in missing energy events may have singularity structures. The singularity variables are devised to capture the singularities effectively for given event topology. They can greatly improve the discovery potential of new physics signals as well as to extract the mass spectrum information at hadron colliders. Focusing on the antler decay topology of resonance, we derive a novel singularity variable whose distribution has endpoints directly correlated with the resonance mass. As a practical application, we examine the applicability of the singularity variable t…
Non-Standard Neutrino Interactions at a Muon Collider Neutrino Detector
Deutsches Elektronen-Synchrotron DESY（德国电子同步加速器）；Department of Physics and Astronomy, University of California, Irvine（加州大学尔湾分校物理与天文系）；Centre for Cosmology, Particle Physics and Phenomenology (CP3), UCLouvain（天主教鲁汶宇宙学、粒子物理与现象学中心）；Faculty of Physics, University of Warsaw（华沙大学物理系）；Center for Particle Physics Siegen, University of Siegen（锡根大学粒子物理锡根中心）；PITT PACC, Department of Physics and Astronomy, University of Pittsburgh（匹兹堡大学物理与天文系皮特粒子物理与宇宙学中心）
Nucleon Energy Correlators as a Probe of Light-Quark Dipole Operators at the Electron-Ion Collider
Central South University（中南大学）；University of Utah（犹他大学）；University of Jyväskylä（于韦斯屈莱大学）；Helsinki Institute of Physics（赫尔辛基物理研究所）；South China Normal University（华南师范大学）
Chirality is a ubiquitous concept in modern science, from particle physics to biology. In quantum physics, chirality of fermions is linked to topology of gauge fields by the chiral anomaly. While the chiral anomaly is usually associated with the short-distance behavior in field theory, in recent years it has been realized that it also affects the macroscopic behavior of systems with chiral fermions. In particular, the local imbalance between left- and right-handed fermions in the presence of a magnetic field induces non-dissipative transport of electric charge ("the Chiral Magnetic Effect", CM…
Probing the CP violation effects via the angular coefficients in Drell-Yan production
Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）；School of Physical Sciences, University of Chinese Academy of Sciences（中国科学院大学物理科学学院）；Center for High Energy Physics, Peking University（北京大学高能物理中心）
The chiral magnetic effect in a strong magnetic field can be described using the chiral anomaly in the $(1+1)$-dimensional massive Schwinger model with a time-dependent $θ$-term. We perform a digital quantum simulation of the model at finite $θ$-angle and vanishing gauge coupling using an IBM-Q digital quantum simulator, and observe the corresponding vector current induced in a system of relativistic fermions by a global {\it chiral quench} -- a sudden change in the chiral chemical potential or $θ$-angle. At finite fermion mass, there appears an additional contribution to this current that ste…
The chiral magnetic effect (CME) refers to charge separation along a strong magnetic field due to imbalanced chirality of quarks in local parity and charge-parity violating domains in quantum chromodynamics. The experimental measurement of the charge separation is made difficult by the presence of a major background from elliptic azimuthal anisotropy. This background and the CME signal have different sensitivities to the spectator and participant planes, and could thus be determined by measurements with respect to these planes. We report such measurements in Au+Au collisions at a nucleon-nucle…
