Research Interests

I am an experimental particle physicist whose interests lie in probing the most basic interactions in nature. There now exists a theory of the Strong and Electroweak interactions (“the Standard Model”) that has been tested to high accuracy and that explains almost all existing experimental data. The great success of this theory provides a framework for asking even more basic questions: What is the physics that generates quark and lepton masses? What determines the size of the Fermi constant? What is the mechanism responsible for the CP noninvariance observed in nature? It is such questions that my collaborators and I hope to address.

Many extensions to the Standard Model offer possible answers to these questions. In a large class of theories we expect new phenomena to appear when quarks or leptons collide at center-of-mass energies in the range of 100 GeV to 1 TeV. At the present time, hadron colliders are the only means of reaching these energies.

Current Projects

I am currently a collaborator on two collider experiments: the Collider Detector at Fermilab (CDF) and the Atlas experiment at CERN. Both of these experiments have substantial Lawrence Berkeley National Laboratory involvement.

CDF was built by a collaboration of physicists from the U.S., Japan and Italy. It has been operating at the Tevatron pbarp collider since 1987. The Tevatron produces collisions with a center-of-mass energy of 2 TeV, the highest energy currently available anywhere (this will change in 2008). Among the most important work done with CDF to date are the discovery of the top quark, the world’s most precise measurement of the W boson mass and the first observation of Bs mixing.

On CDF I have concentrated on studies of B hadrons. Precision measurements of B decay rates allow us constrain models of physics beyond the Standard Model (which would contribute to these decays through virtual diagrams). My involvement in CDF is winding down as I prepare for work at the Large Hadron Collider (LHC).

The LHC is a pp collider with center-of-mass energy 14 TeV that is scheduled to being data-taking in 2008. The primary physics motivation for the LHC is to search for phenomena that give insight into electroweak symmetry breaking. It is this process that is believed to give mass to all elementary particles. Some possible physics signals at the LHC are: the existence of one or more fundamental scalar particles (Higgs bosons) or the presence of “supersymmetric” partners for the known elementary particles.

Berkeley/LBNL is working on the inner tracking detector for the Atlas experiment. We are currently involved in the installation and commissioning of the silicon strip detectors and of pixel detectors. Our work in the past has been in the areas of high speed, radiation hard electronics and of mechanical design of modules. This project involves many serious technical channels. In addition, Berkeley has a major role in preparations for LHC physics. We are working on the track reconstruction software and on the development of strategies for extracting new physics signals.

I am currently a collaborator on two collider experiments: the Collider Detector at Fermilab (CDF) and the Atlas experiment at CERN. Both of these experiments have substantial Lawrence Berkeley National Laboratory involvement.

CDF was built by a collaboration of physicists from the U.S., Japan and Italy. It has been operating at the Tevatron pbarp collider since 1987. The Tevatron produces collisions with a center-of-mass energy of 2 TeV, the highest energy currently available anywhere (this will change in 2008). Among the most important work done with CDF to date are the discovery of the top quark, the world’s most precise measurement of the W boson mass and the first observation of Bs mixing.

On CDF I have concentrated on studies of B hadrons. Precision measurements of B decay rates allow us constrain models of physics beyond the Standard Model (which would contribute to these decays through virtual diagrams). My involvement in CDF is winding down as I prepare for work at the Large Hadron Collider (LHC).

The LHC is a pp collider with center-of-mass energy 14 TeV that is scheduled to being data-taking in 2008. The primary physics motivation for the LHC is to search for phenomena that give insight into electroweak symmetry breaking. It is this process that is believed to give mass to all elementary particles. Some possible physics signals at the LHC are: the existence of one or more fundamental scalar particles (Higgs bosons) or the presence of “supersymmetric” partners for the known elementary particles.

Berkeley/LBNL is working on the inner tracking detector for the Atlas experiment. We are currently involved in the installation and commissioning of the silicon strip detectors and of pixel detectors. Our work in the past has been in the areas of high speed, radiation hard electronics and of mechanical design of modules. This project involves many serious technical channels. In addition, Berkeley has a major role in preparations for LHC physics. We are working on the track reconstruction software and on the development of strategies for extracting new physics signals.

Selected Publications

A. Abulencia et. al, "Observations of B0(s)-B-bar0(s) Oscillations," Phys Rev Lett 97, 24203 (2006)

D. Acosta et al, "Measurement of the Moments of Hadronic Invariant Mass Distributions in Semilptonic B Decays," Phys Rev D71, 051103 (2005).

Atlas Collaborationa, "ATLAS Detector and Physics Performane Technical Design Report," http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/TDR/acces.html

Atlas Collaboration, “Atlas Technical Proposal,” CERN/LHCC/94-43.

M. Shapiro and J. Siegrist, “Hadron collider physics,” Ann. Rev. Nucl. and Part. Sci. 41, 97 (1991).