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CMS at the University of Colorado

Several members of the High Energy Physics (HEP) group at the University of Colorado at Boulder (CU) are working on the CMS experiment. CMS (Compact Muon Solenoid) is an experiment which will run in the Large Hadron Collider (LHC) at CERN in Geneva, Switzerland. The main goals of the CMS Collaboration are to discover (or rule out at some level) the existence of the Higgs particle and supersymmetry as well as look for other new physics at the energy frontier. The experiment is scheduled to begin taking data in 2007.

The CU HEP group is currently working on the forward pixel detector, tracking development, and supersymmetry analysis.

The CU HEP members currently involved in CMS are:

• Professor John Cumalat
• Professor Uriel Nauenberg
• Assistant Professor Kevin Stenson
• Assistant Research Professor Stephen Wagner
• Research Associate Mauro Dinardo
• Research Associate Keith Ulmer
• Research Associate Shi-Lei Zang
• Graduate Student Brian Drell
• Graduate Student Kevin Givens
• Graduate Student Bernadette Heyburn
• Graduate Student Joseph Proulx

Forward Pixel Project

Cumalat and Stenson are leading the Colorado contribution to the CMS forward pixel effort. Dinardo and former graudate student Max Bunce spent the second half of 2006 at Fermilab assembling and testing part of the forward pixel detector. Dinardo moved to CERN in January, 2007. During 2007 he has prepared the clean room for the reconstruction and testing of the forward pixel system by setting up the needed power, electronics, chiller, dry air, and testing systems. He has also made successful tests of the forward pixel detectors using charge injection and radioactive sources. In June 2007, Heyburn moved to CERN full time to aid in these efforts. She has also taken charge of cabling issues for the pixel detector.

Tracking Development

Wagner is heading up the CMS tracking development work at Colorado. He is a co-convener of the LPC tracking group and co-manager of the track reconstruction working group.

Drell is working on reconstruction of V⁰ particles in CMS.

Supersymmetry Analysis

Nauenberg is working with Heyburn and Zang on aspects of the supersymmetry searches which will begin in earnest as data arrives in 2008.

Rare B decays

Stenson is working with Ulmer on rare B decays. The modes currently being studied are B⁰ --> K_S mu⁺ mu^-, Lambda_b --> Lambda mu⁺ mu^-, and B⁺ --> K^*+(K_Spi⁺) mu⁺ mu^-.

Electroweak physics

Wagner is working with Proulx on electroweak physics. They are currently investigating pp --> Wbb, pp --> WZ, and Z --> bb.