W-boson mass anomaly from a general SU(2)_(L)scalar multiplet  

作　　者：吴佳骏 黄达 耿朝强 Jiajun Wu;Da Huang;Chao-Qiang Geng(School of Fundamental Physics and Mathematical Sciences,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,China;University of Chinese Academy of Sciences(UCAS),Beijing 100049,China;CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China;International Centre for Theoretical Physics Asia-Pacific,Beijing/Hangzhou,China;National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China)

机构地区：[1]School of Fundamental Physics and Mathematical Sciences,Hangzhou Institute for Advanced Study,UCAS,Hangzhou 310024,China [2]University of Chinese Academy of Sciences(UCAS),Beijing 100049,China [3]CAS Key Laboratory of Theoretical Physics,Institute of Theoretical Physics,Chinese Academy of Sciences,Beijing 100190,China [4]International Centre for Theoretical Physics Asia-Pacific,Beijing/Hangzhou,China [5]National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100012,China

出　　处：《Chinese Physics C》2023年第6期15-35,共21页中国物理C（英文版）

基　　金：Supported in part by the National Key Research and Development Program of China(2021YFC2203003,2020YFC2201501);the National Natural Science Foundation of China(NSFC)(12005254,12147103)。

摘　　要：We explain the W-boson mass anomaly by introducing an SU(2)_(L)scalar multiplet with general isospin and hypercharge{in the case without its vacuum expectation value}.It is shown that the dominant contribution from the scalar multiplet to the W-boson mass arises at the one-loop level,which can be expressed in terms of the electroweak(EW)oblique parameters T and S at leading order.We first rederive the general formulae of T and S induced by a scalar multiplet of EW charges,confirming the results in literature.We then study several specific examples of great phenomenological interest by applying these general expressions.As a result,it is found that the model with a scalar multiplet in an SU(2)_(L)real representation with Y=0 cannot generate the required M_(W)correction because it leads to vanishing values of T and S.However,the cases with scalars in a complex representation under SU(2)_(L)with a general hypercharge can explain the M_(W)excess observed by CDF-Ⅱowing to nonzero T and S.We further consider the strong constraints from the perturbativity and EW global fit of the precision data and vary the isospin representation and hypercharge of the additional scalar multiplet to assess the extent of the model to solve the W-boson mass anomaly.It turns out that these constraints play important roles in setting limits on the model parameter space.We also briefly describe the collider signatures of the extra scalar multiplet,especially when it contains long-lived,heavy,highly charged states.

关 键 词：electroweak precision physics multi-Higgs models specific BSM phenomenology 

分 类 号：O413[理学—理论物理]