Our research group (the Hitlin/Porter group) studies the flavor sector of the
Standard Model by making increasingly precise measurements of the production an decay properties of heavy quarks and leptons.
These experiments, carried out over the last several decades with the Mark II
(at SPEAR, PEP and SLC), Mark III, Crystal Ball, BES-II, SLD and BABAR
detectors, have been crucial in establishing the validity of the Standard
Model flavor sector ansatz. In particular the measurement of the CP
asymmetry in B0 decays at BABAR was cited in the
award of the 2008 Nobel Prize to Kobayashi and Maskawa.
Our current program comprises the Mu2e
experiment at Fermilab and continued analysis of BABAR data. Our
particular interest is the search for evidence of charged lepton flavor
violation in muon to electron conversion and in rare t lepton
is a new experiment at Fermilab whose aim is the discovery of charged lepton
flavor violation via the process of muon to electron conversion.
received CD-1 approval from the Department of Energy in July, 2012, and CD2/3a
approval in March, 2015
Caltech is working on the design and construction of the crystal
calorimeter system of Mu2e. We have responsibilities in the area of
calorimeter geometry, photosensor development, crystal
and readout specification and testing, modeling, the calibration system and
the online system.
Mu2e Conceptual Design Report
Mu2e Technical Design Report
The BABAR experiment took data at the
PEP-II asymmetric B Factory a SLAC from 1999 to 2008.
The experiment first demonstrated the existence of a CP-violating
asymmetry in the decays of B0 mesons. BABAR
continues to produce forefront results; it has published nearly 500 papers on
many aspects of heavy quark and t
now in its archival analysis phase. Caltech is doing a number of important
analyses on searches for dark photons, measurements of time-dependent CP-violating
asymmetries, and branching ratios of rare decays.
The 2008 Nobel Prize was awarded to Makoto Kobayashi
and Toshihide Maskawa
(one half), and to Yoichiro Nambu
Nobel medal (chocolate version)
SLAC Director Jonathan Dorfan and I were invited by Kobayashi san to attend,
along with our KEK colleagues, in recognition (cited in the Nobel
press release) of the contributions of BABAR and Belle in proving
the relevance of the CKM phase as the source of CP violation in the
Article in SLAC Today
Blog of the week's activities in