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Positivity in electron-positron scattering:testing the axiomatic quantum field theory principles and probing the existence of UV states

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Chinese Physics C 2021年第2期45卷 176-199页

作者： Benjamin Fuks Yiming Liu Cen Zhang Shuang-Yong Zhou Sorbonne Université CNRSLaboratoire de Physique Théorique et HautesÉnergiesLPTHEF-75005 ParisFrance Institut Universitaire de France 103 boulevard Saint-Michel75005 ParisFrance Institute of High Energy Physics Chinese Academy of SciencesBeijing 100049China School of Physical Sciences University of Chinese Academy of SciencesBeijing 100049China Center for High Energy Physics Peking UniversityBeijing 100871China Interdisciplinary Center for Theoretical Study University of Science and Technology of ChinaHefei 230026China Peng Huanwu Center for Fundamental Theory Hefei 230026China

We consider the positivity bounds on dimension-8 four-electron operators and study two related phenomenological aspects at future lepton ***,if positivity is violated,probing such violations will revolutionize our understanding of the fundamental pillars of quantum field theory and the S-matrix *** observe that positivity violation at scales of 1-10 TeV can potentially be probed at future lepton colliders even if one assumes that dimension-6 operators are also ***,the positive nature of the dimension-8 parameter space often allows us to either directly infer the existence of UV-scale particles together with their quantum numbers or exclude them up to certain scales in a model-independent *** particular,dimension-8 positivity plays an important role in the test of the Standard *** no deviations from the Standard Model are observed,it allows for simultaneous exclusion limits on all kinds of potential UV-complete *** the dimension-6 case,these limits apply regardless of the UV model setup and cannot be removed by possible cancellations among various UV *** thus consists of a novel and universal test to confirm the Standard *** demonstrate with realistic examples how all the previously mentioned possibilities,including the test of positivity violation,can be ***,we provide an important motivation for studying dimension-8 operators more comprehensively.

关键词： electron-positron collider positivity bound Standard Model Effective Field Theory

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Light dark sector searches at low-energy high-luminosity e^＋e^- colliders

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Frontiers of physics 2016年第5期11卷 9-22页

作者： Peng-Fei Yin Shou-Hua Zhu Key Laboratory of Particle Astrophysics Institute of High Energy Physics Chinese Academy of Sciences Beijing 100049 China Institute of Theoretical Physics & State Key Laboratory of Nuclear Physics and Technology Peking University Beijing 100871 China Collaborative Innovation Center of Quantum Matter Beijing 100871 China Center for High Energy Physics Peking University Beijing 100871 China

Although the standard model （SM） is extremely successful, there are various motivations for considering the physics beyond the SM. For example, the SM includes neither dark energy nor dark matter, which has been confirmed through astrophysical observations. Examination of the dark sector, which contains new, light, weakly-coupled particles at the GeV scale or lower, is well motivated by both theory and dark-matter detection experiments. In this mini-review, we focus on one particular case in which these new particles can interact with SM particles through a kinematic mixing term be- tween U（1） gauge bosons. The magnitude of the mixing can be parameterized by a parameter e. Following a brief overview of the relevant motivations and the constraints determined from numerous experiments, we focus on the light dark sector phenomenology at low-energy high-luminosity e^＋e^- colliders. These colliders are ideal for probing the new light particles, because of their large production rates and capacity for precise resonance reconstruction. Depending on the details of a given model, the typical observed signatures may also contain multi lepton pairs, displaced vertices, and/or missing energy. Through the use of extremely large data samples from existing experiments, such as KLOE, CLEO, BABAR, Belle, and BESIII, the ε 〈 10^-4-10^-3 constraint can be obtained. Obviously, future experiments with larger datasets will provide opportunities for the discovery of new particles in the dark sector, or for stricter upper limits on ε. Once the light dark sector is confirmed, the particle physics landscape will be changed significantly.

关键词： dark photon electron-positron collider dark matter

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