Physics and Astronomy Colloquium Series
May 5, 2016
"Performance of the Diamond Beam Monitor at ATLAS"
The Diamond Beam Monitor (DBM) was recently implemented at the Large Hadron Collider (LHC) as an attempt to increase the longevity of the pixel detectors in a high radiation environment without the need for extensive cooling. As collision energies increase, so will the possibility of damage due to ionized particles. The DBM not only offers greater radiation tolerance, but will provide steady response even at higher energies. Along with the implementation of the DBM, the XAOD was made to be the data format of choice. With this new format it allows us to analyze the new data being produced from the DBM more directly. The focus of the project is the extraction of data from the XAOD and developing the analysis structure needed to do proper tracking.
"Exotic Higgs Decays: The Search for a New Particle"
The discovery of the Higgs boson has opened up new avenues of possible discovery. The small width and ease with which the Higgs can interact with beyond the standard model (BSM) particles causes its branching ratio to be of the order of 20-50% for BSM states. There is also a strong motivation that either a new pseudo-scalar or scalar particle is a decay state of the Higgs and may act as a mediator for dark matter annihilation. A possible decay channel for this new mediator is h→2a→bbμμ. Using a kinematic fitter we were able to constrain the mass of the two b-jets with the high mass resolution of the two muons to improve the Higgs mass resolution. This resolution improvement could possibly aid in finding a new particle’s signal within the ATLAS data.
The Physics and Astronomy Colloquium Series is open to all members of the university. Unless otherwise noted, talks are held on Thursday afternoons at 4:00-5:20 in Mendocino 1015. Schedule is regularly updated as dates, titles, and abstracts are received. Please check back often. To receive updates about the Colloquium Series, please join our Events Mailing List. For past semesters' series, see our archive.
Spring 2016 Semester Schedule