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

作     者：Benjamin Fuks Yiming Liu Cen Zhang Shuang-Yong Zhou Benjamin Fuks;刘一鸣;张岑;周双勇

作者机构：Sorbonne UniversitéCNRSLaboratoire de Physique Théorique et HautesÉnergiesLPTHEF-75005 ParisFrance Institut Universitaire de France103 boulevard Saint-Michel75005 ParisFrance Institute of High Energy PhysicsChinese Academy of SciencesBeijing 100049China School of Physical SciencesUniversity of Chinese Academy of SciencesBeijing 100049China Center for High Energy PhysicsPeking UniversityBeijing 100871China Interdisciplinary Center for Theoretical StudyUniversity of Science and Technology of ChinaHefei 230026China Peng Huanwu Center for Fundamental TheoryHefei 230026China 

出 版 物：《Chinese Physics C》 (中国物理C（英文版）)

年 卷 期：2021年第45卷第2期

页      面：176-199页

核心收录：

学科分类：07[理学] 070201[理学-理论物理] 0702[理学-物理学] 

基　　金：CZ is supported by IHEP(Y7515540UI)and National Natural Science Foundation of China(NSFC)(12035008) SYZ acknow ledges suppont from the starting grants from University of Science and Technology of China(K20000089,GG2030040375) is also supported by NSFC(12075233,11947301,12047502) supprted by the Fundamental Rssearch Funds for the Central Universities(WK230000036) This work has been supported by the FCPPL France China Particle Phys-ics Laboratory of the IN2P3/CNRS 

主　　题：electron-positron collider positivity bound Standard Model Effective Field Theory 

摘      要：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.