https://scholars.lib.ntu.edu.tw/handle/123456789/626538
標題: | Explanation of the W mass shift at CDF II in the extended Georgi-Machacek model | 作者: | Ting-Kuo Chen CHENG-WEI CHIANG Kei Yagyu |
關鍵字: | STANDARD-MODEL | 公開日期: | 2022 | 出版社: | AMER PHYSICAL SOC | 卷: | 106 | 期: | 5 | 來源出版物: | Physical Review D | 摘要: | The CDF II experiment has recently determined the mass of the W boson to be mW(CDF II)=80.4335±0.0094 GeV, which deviates from the standard model prediction at 7σ level. Although this new result is in tension with other experiments such as those at LHC and LEP, it is worth discussing possible implications on new physics by this anomaly. We show that this large discrepancy can be explained by nonaligned vacuum expectation values of isospin triplet scalar fields in the Georgi-Machacek model extended with custodial symmetry-breaking terms in the potential. The latter is required to avoid an undesirable Nambu-Goldstone boson as well as to be the consistent treatment of radiative corrections. With mW(CDF II) as one of the renormalization inputs at the one-loop level, we derive the required difference in the triplet vacuum expectation values, followed by a discussion of phenomenological consequences in the scenario. |
URI: | https://scholars.lib.ntu.edu.tw/handle/123456789/626538 | ISSN: | 2470-0010 | DOI: | 10.1103/PhysRevD.106.055035 |
顯示於: | 物理學系 |
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