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    Department of Physics Graduate Program - 103-33 - Pasadena - California - 91125

    Experimental High Energy Physics

BABAR is an experiment at the PEP-II Asymmetric B Factory at SLAC, the premier facility for the study of heavy quark and heavy lepton physics. In the summer of 2001, BABAR published the first measurement of a CP-violating asymmetry in B meson decay, providing a new, uniquely sensitive test of the Standard Model of elementary particle physics. Ongoing detailed studies of heavy quark decays provide perhaps the best short term opportunity to unearth effects indicative of physics beyond the Standard Model. Information about BABAR can be found at Studies are also beginning towards SuperB, a next generation experiment with substantially improved capabilities. There are openings for graduate students for thesis research, as well as for undergraduates for part term research projects during the academic year or the summer. For more information, contact Professor David Hitlin at or Professor Frank Porter
CMS - (Compact Muon Solenoid) is one of the two major experiments at CERN's Large Hadron Collider (the LHC) in Geneva, designed and constructed to elucidate the nature of electroweak symmetry breaking and dark matter in the universe, and to discover supersymmetry or other new physics scenarios beyond the Standard Model. The first three-year run of the LHC and CMS with proton-proton collisions at 7-8 TeV resulted in the discovery of the long-sought Higgs boson. A vast set of results on searches for new physics and standard model measurements have been also produced with the LHC RUN I datasets. The upcoming LHC run at higher energy (13-14 TeV) in 2015-18 is anticipated to lead to a round of groundbreaking discoveries.

Caltech has led the search for the Higgs using the distinctive decays to two photons as well as Z and W pairs. The group has expanded the search for Supersymmetry using a novel approach to detect the SUSY or other heavy pair produced signals in inclusive final states. The group also has had a central role and expertise in searches for TeV-scale gravity in Randall-Sundrum models, excited leptons and Z-primes. This is an especially exciting time as the group is preparing a comprehensive program to discover and characterize a set of new physics signals that may arise in the highest energy run int he history of hadron colliders.

Graduate students as well as undergraduates in the group are active in data analysis and in the preparation, calibration and commissioning of the detector, with a focus on the precision electromagnetic calorimeter and hadron calorimeter, as well as the development and deployment of the trigger menus. In addition to direct involvement in the discovery physics program, students joining the group will participate in the data taking, calorimeter detector operations and monitoring as well as trigger and dataset development. They will have the opportunity to take part in a detector research and development program at test beams at FNAL and CERN of new advanced radiation hard detectors for precision electron and photon measurements and for ultrafast timing, designed for the future High Luminosity LHC.

The group invests in an extensive detector and physics program R&D through the development and application of innovative methods and instruments. Recent examples include the development of a new forward electromagnetic calorimeter for the high luminosity LHC based on a new fast, bright and radiation crystal scintillator, ultrafast timing for pileup mitigation, advanced data technologies including machine learning-based methods applications, and global software driven systems integrating computing, storage and networks.

The group has been working closely with theorists an phenomenologists in areas spanning the standard model background calculations, especially W/Z/tt+jets QCD associated production, the Higgs CP properties, and of course SUPSY and DM phenomenology. A team of engineers and physicists with deep technical expertise in operations in crystal scintillators, grid computing, networking and global scale collaborative systems is integrated with the physics research team. Information about CMS and the LHC can be found at and For more information on research opportunities with the CMS group, contact Professor Harvey Newman at and Professor Maria Spiropulu

NOvA is investigating fundamental questions about the neutrino sector and the Standard Model more broadly. A high-intensity beam of neutrinos, produced at FNAL, is directed toward NOvA's massive 14-kiloton "far" detector located in northern Minnesota. (A smaller "near" detector is located on-site at FNAL.) Imprinted on the neutrinos after this 810-km journey is information on neutrino masses, weak mixing, leptonic CP violation, and beyond-the-Standard-Model phenomena such as CPT violation, non-standard interactions, and sterile states. The Caltech group has leading roles in the design of NOvA's novel detectors and in their assembly, commissioning, and calibration. We are also deeply engaged in the development of analyses that will provide NOvA's tremendous physics reach. A new graduate student would be active in any and all aspects of the experiment. Detector construction is complete and data taking is underway. More information about the group including our other activities can be found at For information on research opportunities with the group, contact Professor Ryan Patterson at

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November 2014