Carnegie Mellon University


The members of the Carnegie Mellon University high-energy physics group working on the CMS experiment at the LHC presently include four faculty members (T. Ferguson, M. Paulini, J. Russ, and H. Vogel), two senior research scientists (N. Terentiev and I. Vorobiev), two post-doctoral researchers (S.Y. Jun and D. Jang), and three graduate students (B. Akgun, R. Carroll, and Y. Liu). 

We are one of the longest-participating U.S. groups in the CMS collaboration, having joined the experiment in 1994.  Our group was responsible for designing and constructing 160,000 channels of front-end electronics for the anode wires of the endcap muon cathode-strip chambers.  Signals from the anode wires allow us to measure the angle that a muon makes with respect to the beam axis and to determine which beam crossing the muon came from.  Both of these determinations are crucial in triggering and measuring muons from the proton-proton collisions.  More details on the anode electronics can be found at: http://www-hep.phys.cmu.edu/cms/.

Some of our software projects have involved the calibration of the cathode-strip chambers, the timing of the anode-wire electronics, analyzing test-beam and cosmic-ray data, producing many of the databases needed to store information about the experiment, and improving the Monte Carlo simulation program of the CMS detector.

One of our analysis interests includes the production of upsilon particles (made up of a b quark and an anti-b quark).  These particles should be produced copiously, and thus can be measured in the early LHC running.  Their decay to two muons will allow us to measure the efficiency of the endcap muon chambers, and the measurement of their production rate is a good test of theory.  The group is also interested in looking for dark-matter candidates produced at the LHC, especially ones that decay to muons and others that are long-lived enough that they could be identified using the timing from the end-cap muon chambers.  These searches for dark matter will provide synergy with the recently established Bruce and Astrid McWilliams Center for Cosmology at Carnegie Mellon University.  The purpose of this center is to try to better understand dark matter and dark energy, using both astrophysical and particle physics measurements.  More details on the center can be found at: http://www.cmu.edu/cosmology/.