Benjamin C. Shen
Distinguished Professor of Physics
Ph.D. 1965, University of California, Berkeley
Experimental particle physics and astrophysics.
E-mail: benjamin.shen@ucr.edu
Phone: (951) 827-5309
Fax: (951) 827-4529
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Electron-Positron Collisions at LEP
The UCR High Energy Physics group has a long-standing research program in electron positron collisions. As a founding member of the TPC collaboration, we have studied both electron positron annihilation physics and photon photon interactions at the PEP storage ring accelerator at SLAC from 1976 to 1989. To continue the study of e+e- annihilations at the highest available energies, the group joined the OPAL collaboration at CERN in 1984 and took responsibility for building and operating the segmented readout of the limited streamer tube chambers of the hadron calorimeter. UCR was one of the most productive physics groups within OPAL, making leading contributions to a broad range of topics including the initial measurements of the mass and width of the Z boson, neutrino counting, lepton flavor violation, particle production, searches for new particles, and QCD. Since 2002, UCR has been a member of the BaBar collaboration at the SLAC B-factory. The BaBar experiment is dedicated to the study of CP violation in B meson decays. In addition to all aspects of the physics of CP violation, we study rare decays of heavy quarks and the tau lepton with unprecedented statistical precision.
CMS at the Large Hadron Collider
The Standard Model of elementary particles (SM) has been very successful in describing most experimental observations so far. Despite two decades of searching, the Higgs boson has eluded exhaustive searches at CERN and FNAL. The observation of the Higgs boson is one of the primary objectives of building the Large Hadron Collider (LHC) at CERN. UCR was one of the first American members of the Compact Muon Solenoid (CMS) collaboration. CMS is one of the two general-purpose detectors at the LHC. In 1991, UCR led the RD-5 experiment, using beams at the CERN-SPS to test the proposed CMS muon tracking system. UCR took responsibility for the final assembly and testing of the endcap muon chambers at the California systems site. We are also playing significant roles in software and computing work. The CMS detector is in the final stages of assembly and testing prior to its installation in the collison hall. The LHC is scheduled for first beam in 2007, and the initial operation for physics is expected soon after. UCR will be engaged in the search for the Higgs boson with high-energy electrons and muons from the collisions. We will also be looking for evidence for new particles predicted in theories beyond the SM, such as Supersymmetry.
Selected Publications
"W Physics and Testing the Standard Model at LEP", B. C. Shen, Chinese J. Physics 35,809-817 (1997).
"Search for New Physics in Rare B Decays", G. Abbiendi et al.,(OPAL Collaboration), Phys. Lett. B 476, 233-242 (2000).
"Search for Lepton Flavour Violation in e+e- Collisions at sqrt{s}=189-209 GeV", G. Abbiendi et al., (OPAL Collaboration), Phys. Lett. B 519, 23-32 (2001).
"The High Energy Gamma-Ray Fluence and Energy Spectrum of GRB 970417a from Observations with Milagrito", R. Atkins et al., (Milagro Collaboration), ApJ. 583, 824-832 (2003).
"Gas System Upgrade for the BaBar IFR Detector at SLAC", S. Foulkes et al., Nucl. Instrum. Meth. A 538, 801-809 (2005)
"Measurement of Time-dependent CP Asymmetries and the CP-odd Fraction in the Decay B0 --> D+D-sup>", B. Aubert et al., (BaBar Collaboration), Phys. Rev. Lett., 95, 151804 (2005).
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