Elementary Particle Physics Seminar

All future


Wednesday, January 23rd 2019
There will be no seminar this week.

Wednesday, January 30th 2019
12:30 pm:
Speaker: Christopher Palmer (Princeton University)
Subject: Observation of the Higgs boson decaying to bottom quarks at CMS

The Higgs boson decay to a bottom quark-antiquark pair has been sought
for decades by the high energy community (i.e. at LEP and Tevatron).
LHC experiments built analyses based on the experience of Tevatron
experiments' analysis techniques. With the observation of the Higgs
boson at LHC during Run 1, the search for this decay channel became
sharply focused. As the bottom quark pair channel is the most
probable decay of the Higgs boson (58%), its observation is both
important in terms of quantifying the Higgs boson and it represents an
important milestone in high energy physics. The results presented use
datasets from the LHC Run 1 and Run 2 (2016+2017) from CMS. This Run
2, 13 TeV dataset corresponds to an integrated luminosity of ~80
fb^-1. The analysis strategy, the background estimation techniques,
and significant analysis improvements from the 2017 data analysis in
CMS are shown. An outlook on the upcoming analysis of the full Run 2
dataset (and beyond) will be discussed.


Wednesday, February 6th 2019

Wednesday, March 6th 2019
Speaker: Jim Linnemann, Michigan State University
Subject: HAWC: Extreme Astronomy with Big Buckets of Water

Though we can see thousands of stars in a clear night sky, the number of known sources emitting TeV gamma rays is less than 200. This is both because there are few instruments capable of measuring such photons, and because the sources are restricted to particularly violent astrophysical processes which
produce photons of 100 TeV and beyond. The HAWC (High Energy Water Cherenkov) array is the only survey instrument in this energy range. Located on a plateau between two volcanos in Mexico at an altitude of 4100 m, HAWC is able to survey 60% of the sky, and observes 1/6 of the full sky at any moment, day or night. I will discuss the array, its construction and principles of operation, a selection of recent results spanning particle astrophysics to astronomy, and how we are pursuing multi-messenger astronomy to better understand the nature of TeV gamma ray sources.

Faculty Host: Roger Rusack

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