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Abstract：
A new particle usually manifests as a single resonant peak at its mass. We propose that the new particle mass can be time-varying due to environmental effects, then its mass spectrum typically has a novel double-peak feature. A representative model is the kinetic mixing dark photon interacting with an ultralight complex scalar dark matter charged under $U(1)'$. We reanalyze the existing constraints on the time-varying $A'$. We show they are drastically weakened because of the reduction of the luminosity exposure in each resonant mass bin.
Consequently, for mass around tens of MeV, the muon $(g-2)_\mu$ solution from the kinetic mixing dark photon becomes viable again. In addition, we propose improving the sensitivity by using the time-stamp of the events. Reanalyzing the CMS Open Data, we demonstrate that the time-stamp of events improves about one order of sensitivity compared with the double-peak method. It is a path-finder analysis for the time-dependent signal and opens up a new category for the exotic searches at collider and beam dump experiments.
Biography:
Dr. Jia Liu is a Researcher at Peking University since 2020. He got his Bachelor Degree at Tsinghua University (2002-2006), Master degree at Peking University (2006-2009), and Ph.D at New York University (2009-2014). After that, he was a postdoc at Mainz University (2014-2017) and Chicago University (2017-2020). He is a particle physics theorist, with research interest in phenomenology of high-energy physics and particle astrophysics.
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