講座主題：CDF W mass anomaly from a dark sector with a Stueckelberg-Higgs portal
專家姓名：劉佐偉
工作單位：南京大學(xué)
講座時(shí)間：2022年5月20日 10:00-11:30
講座地點(diǎn)：騰訊會(huì)議：461-137-584
主辦單位：煙臺(tái)大學(xué)物理與電子信息學(xué)院
內(nèi)容摘要：
We propose an explanation to the new W mass measurement recently reported by the CDF collaboration, which is larger than the standard model expectation by about 7 standard deviations. To alleviate the tensions that are imposed on the electroweak sector by the new W mass measurement, we carry out an analysis in the Stueckelberg extended standard model where a new neutral gauge boson appears which mixes with the two neutral gauge bosons in the electroweak sector both via the Stueckelberg mass terms and via the gauge invariant Stueckelberg-Higgs portal interaction and spoils the custodial symmetry at the tree level so that the simple relation between the W boson mass and the Z boson mass does not hold. We find that such an extension increases the W boson mass if the new gauge boson mass is larger than the Z boson mass. We further show that there exists a significant part of the parameter space in the extended model which includes the CDF mass anomaly and is consistent with the various observables at the Z pole and consistent with the ATLAS dilepton limits. The Stueckelberg Z' boson, which resolves the CDF W mass anomaly, should be searchable in future LHC experiments.
主講人介紹：
劉佐偉,，南京大學(xué)物理學(xué)院教授,。2003年復(fù)旦大學(xué)本科畢業(yè),；2008年美國東北大學(xué)博士畢業(yè)；2008年至2011年在美國紐約州立大學(xué)石溪分校楊振寧理論物理研究所做博士后研究,；2011年至2014年在加拿大麥吉爾大學(xué)做博士后研究；2014年至2016年在清華大學(xué)任副研究員,；2016年至今在南京大學(xué)任教授,。長期從事高能理論研究,，研究方向包括暗物質(zhì)理論和唯象學(xué)研究，加速器實(shí)驗(yàn)上尋找新物理的研究等,。迄今發(fā)表學(xué)術(shù)論文41篇,，引用2600余次，單篇最高引用328次,。
