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University of California
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I am an experimental high energy physicist. I am a member of the CMS collaboration at the Large Hadron Collider (LHC) at CERN. For non-experts, a good starting point to learn about the LHC and its physics program is the LHC Wikipedia page.
My group in CMS has been involved for many years in several searches for supersymmetry (SUSY). I am currently the co-convenor of the CMS SUSY group. We are searching for SUSY in dilepton final states (both same and opposite signs), for pair production of relatively light top squarks favored by naturalness arguments, and more recently we have also been involved in analyzing final states with jets and missing energy. In the past we contributed directly to the discovery of the Higgs boson by studying the WW mode. In addition, we have made measurements of Standard Model processes such as top pair and W pair production, searched for 4th generation top-like quarks, and for production of same sign top pairs. The selected publications listed below give a flavor for the kind of physics that we have been doing.
The LHC came back on line in 2015 at the higher center-of-mass energy of 13 TeV. For the next few years we are looking forward to continue our program centered on searches for new physics.
On the more technical side, we recently completed an upgrade of some of the electronics for the muon system, and we are now contributing to the maintenace and operation of the muon detectors. Earlier we had worked on muon identification and reconstruction, missing transverse energy studies, photon coversion identification, physics dataset definition, and the development of event visualization tools. Furthermore, a large fraction of the modules for the CMS tracker were assembled in our lab on the UCSB campus between 2003 and 2006.
You are welcome to contact me if you would like further information.
At UCSB I have taught physics at all levels: from lower division physics for life science majors to particle physics for 2nd year graduate students. I am not teaching this quarter (Spring 2016).
Search for new physics with the MT2 variable in all-jets final states produced in pp collisions at sqrt(s) = 13 TeV Submitted to JHEP.
Measurements of t t-bar charge asymmetry using dilepton final states in pp collisions at sqrt(s) = 8 TeV Submitted to Phys. Lett. B.
Measurement of top quark-antiquark pair production in association with a W or Z boson in pp collisions at sqrt(s) = 8 TeV Eur. Phys.J. C74 (2014) 3060.
Measurements of the t t-bar charge asymmetry using the dilepton decay channel in pp collisions at sqrt(s) = 7 TeV JHEP 04 (2014) 191.
Measurement of Higgs boson production and properties in the WW decay channel with leptonic final states JHEP 01 (2014) 055 .
Search for new physics in events with same-sign dileptons and jets in pp collisions at sqrt(s)=8 TeV JHEP 01 (2014) 163 .
Measurements of t t-bar spin correlations and top-quark polarization using dilepton final states in pp collisions at 7 TeV Phys. Rev. Lett. 112 182001 (2014) .
Search for top-squark pair production in the single-lepton final state in pp collisions at sqrt(s) = 8 TeV Eur.Phys. J. C73 (2013) 2677 .
Search for new physics in events with same-sign dileptons and b jets in pp collisions at sqrt(s) = 8 TeV JHEP03(2013)037 .
Search for electroweak production of charginos and neutralinos using leptonic final states in pp collisions at sqrt(s) = 7 TeV JHEP 1211(2012) 147.
Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC Phys. Lett. B716, 30 (2012).
Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy Phys. Rev. Lett. 109, 071803 (2012).
Search for new physics in events with opposite-sign leptons, jets, and missing transverse energy in pp collisions at sqrt(s) = 7 TeV Phys. Lett B718, 815 (2013)
Search for new physics in events with same-sign dileptons and b-tagged jets in pp collisions at sqrt(s)=7 TeV JHEP08(2012)110.
Search for physics beyond the standard model in events with a Z boson, jets, and missing transverse energy in pp collisions at sqrt(s)=7 TeV Phys. Lett. B716, 260 (2012).
Search for heavy, top-like quark pair production in the dilepton final state in pp collisions at sqrt(s)=7 TeV Phys. Lett. B716, 103 (2012).
Search for the standard model Higgs boson in the H to ZZ to 2l 2nu channel in pp collisions at sqrt(s) = 7 TeV JHEP 1203 (2012) 040.
Search for the standard model Higgs boson decaying to a W pair in the fully leptonic final state in pp collisions at sqrt(s) = 7 TeV Phys. Lett. B710 91 (2012).
Search for Same-Sign Top-Quark Pair Production at sqrt(s) = 7 TeV and Limits on Flavour Changing Neutral Currents in the Top Sector JHEP 1108 (2011) 005.
Measurement of the t t-bar production cross section and the top quark mass in the dilepton channel in pp collisions at sqrt(s) =7 TeV JHEP 1107 (2011) 049.
Search for new physics with same-sign isolated dilepton events with jets and missing transverse energy at the LHC JHEP06(2011)077
Search for Physics Beyond the Standard Model in Opposite-Sign Dilepton Events at sqrt(s) = 7 TeV JHEP 1106 (2011) 026.
Measurement of WW Production and Search for the Higgs Boson in pp Collisions at sqrt(s) = 7 TeV Phys. Lett. B699 25 (2011).
First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at sqrt(s)=7 TeV Phys. Lett. B695 424 (2011).
Missing ET in 0.9 and 2.36 TeV pp Collisions CMS-PAS-JME-10-002
Performance of Track-Corrected Missing Transverse Energy in CMS CMS-PAS-JME-09-010
Performance of CMS Muon Reconstruction in Cosmic-Ray Events JINST 5 T03022 2010.
Search for rare quark-annihilation decays, B-→Ds(*)-ϕ Phys. Rev. D 73, 011103 (2006).
Study of the decay anti-B0 → D*+ ωπ- Phys. Rev. D74 012001 (2006).
Search for b→u transitions
D 72, 032004 (2005)
Search for B± → [K π±]DK± and upper limit on the b → u
amplitude in B± → D K±
Phys. Rev. Lett. 93 131804 (2004)
Silicon Tracker Module Assembly at UCSB CMS PUBLIC Note 2004/010 (2004).
Measurement of the branching fraction and polarization for the decay B- → D*0 K*- Phys. Rev. Lett. 92 141801 (2004).The design and construction of the BaBar Silicon Vertex Tracker Nucl. Inst. Meth A447 15 (2000).