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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
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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
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