Bulletin of the American Physical Society
2011 Annual Meeting of the Four Corners Section of the APS
Volume 56, Number 11
Friday–Saturday, October 21–22, 2011; Tuscon, Arizona
Session P1: Plenary Session IV |
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Chair: Sally Seidel, University of New Mexico Room: UA Student Union South Ballroom |
Saturday, October 22, 2011 1:30PM - 2:06PM |
P1.00001: Understanding the Lightning Leader Invited Speaker: Before the flash and the bang that lay-people think of as lightning, it is necessary to break down a channel of air several kilometers long through what is known as the leader process. We have been studying the growth of lightning leaders for nearly a decade through a combination of balloon-borne electric field measurements on balloons and on the ground, time of arrival radio-measurements, and high-speed video cameras. Our combination of techniques can penetrate clouds and shows the development of both positive and negative leader channels growing at about 0.001c and carrying net-charge around the sky as they try to minimize electrostatic energy. Recent analysis has revealed the existence of step-recoil waves that propagate away from the tip of a growing leader as well as K-changes that propagate toward the leader tip. These waves probably help keep the leader hot and conductive enough to allow it to persist over the several hundred milliseconds it needs to reach ground.\\[4pt] In collaboration with William Winn, Ken Eack, Jeff LaPierre, New Mexico Tech, Langmuir Lab; William Hager, University of Florida; and Gaopeng Lu, Duke University, ECE Dept. [Preview Abstract] |
Saturday, October 22, 2011 2:06PM - 2:42PM |
P1.00002: Searching for Quark Compositeness at the LHC Invited Speaker: Are quarks - the building blocks that make up protons, neutrons, and hundreds of short-lived particles - the smallest level of structure? Or, does the ``periodic table'' of six quarks suggest that these, in turn, might be composed of more fundamental particles? Since early 2010, experiments at the Large Hadron Collider have been running steadily at 3.5 times the energy of the Fermilab TeVatron. This jump in energy translates directly into a jump to smaller distance scales - making quark compositeness one of the first things to look for at the LHC. I will talk about progress by the ATLAS experiment based on the full 2010 dataset, and its implications for pushing further into this new frontier. [Preview Abstract] |
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