Events at Physics
Events on Tuesday, October 19th, 2021
- Theory Seminar (High Energy/Cosmology)
- Jet Timing
- Time: 4:00 pm
- Place: Chamberlin 5280
- Speaker: Matthew Low, University of Pittsburgh
- Abstract: The measurement of the arrival time of a particle, such as a lepton or photon, reaching the detector provides valuable information. A similar measurement for a hadronic final state, however, is much more challenging as one has to extract the relevant information from a collection of particles. In this talk, I will explore the most effective ways to combine the times of particles into a single time for a jet. First, prompt jets will be discussed, then the more complicated case of delayed jets will be studied. Choosing a good definition of the time of a jet offers a new complementarity probe into hadronic physics at colliders. Note: This is a hybrid event. A zoom link will be distributed via the seminar mailing list. To join, email the organizer.
- Host: Lars Aalsma
- Network in Neutrinos, Nuclear Astrophysics, and Symmetries (N3AS) Seminar
- Exploring Axion-like Particles with Nearby Supernovae
- Time: 6:00 pm
- Place: Zoom:
- Speaker: Kanji Mori , Fukuoka University, Japan
- Abstract: Axion-like particles (ALPs) are hypothetical pseudo-Nambu-Goldstone bosons which are a candidate of dark matter. Since they are thought to couple with photons, ALPs can be produced in hot astrophysical plasma. Once produced, ALPs decay into photons which may be observable with gamma-ray telescopes. I calculated the ALP emission from a thermonuclear (i.e. type Ia) supernova and a massive star in the final stage of stellar evolution. It is shown that gamma-rays that originate from ALPs can be a target of next-generation gamma-ray telescopes and provide an independent constraint on ALP parameters. Also, ALPs may affect energy transfer in core-collapse supernovae. I will mention a preliminary result on supernova explosion aided by heavy ALPs.
- Host: Baha Balantekin