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Research:
My research interest is theoretical particle physics beyond the Standard Model, with emphases on scalar dark matter and lepton flavor violation.
The composition of dark matter can perhaps be explained by simple scalar extensions of the Standard Model. Such extensions are subject to constraints arising from a vacuum stability and perturbativity analysis of the effective potential. In the Standard Model, vacuum stability and perturbativity place theoretical bounds on the Higgs mass. In singlet extensions, these Higgs mass bounds can be altered, and limits can also be obtained on the dark matter mass, its relic abundance, and the scale of new physics.
Lepton flavor violating processes such as mu-to-e conversion and mu-to-e-gamma are important probes of new physics since their rates calculated in the Standard Model (allowing for neutrino oscillations) are unobservable. Electron-to-tau conversion at an electron-ion collider can also probe models of physics beyond the Standard Model. For example, in a general leptoquark framework, electron-to-tau searches at a high luminosity e-p facility could surpass present limits from tau-to-e-gamma searches; furthermore, e-to-tau is sensitive to certain types of leptoquark interactions not present in a tau-to-e-gamma process.
Recent Papers:
1) Electron-to-Tau Lepton Flavor Violation at the Electron-Ion Collider.
Matthew Gonderinger, (Wisconsin U., Madison), Michael J. Ramsey-Musolf, (Wisconsin U., Madison & Caltech, Kellogg Lab). NPAC-10-09, Jun 2010. 19pp.
e-Print: arXiv:1006.5063 [hep-ph]
2) Vacuum Stability, Perturbativity, and Scalar Singlet Dark Matter.
Matthew Gonderinger, Yingchuan Li, Hiren Patel, (Wisconsin U., Madison), Michael J. Ramsey-Musolf, (Wisconsin U., Madison & Caltech, Kellogg Lab). NPAC-09-13, Oct 2009. 24pp.
Published in JHEP 1001:053,2010.
e-Print: arXiv:0910.3167 [hep-ph]
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