Assistant Professor, Department of Physics and Astronomy
University of Nebraska-Lincoln

Research:
Experimental high-energy particle physics, at the moment focused on the top quark and its weak interactions. Current projects:
o The D0 experiment at the Fermi National Accelerator Laboratory (FNAL) in Batavia, IL. This experiment is currently taking data, and will until at least 2009. Students starting soon will do their thesis work here. http://www-d0.fnal.gov/
o The CMS experiment at CERN in Geneva, Switzerland. This experiment is in the design and construction phase, and will start taking data in 2007 (we hope). http://cms.cern.ch/

At UNL, I collaborate on these projects with faculty members Dan Claes, Aaron Dominguez, and Greg Snow. In the past, I've worked on:

o The CDF experiment, also at FNAL (1989-1992 and 1997-2004). http://www-cdf.fnal.gov/ My final project there was a measurement of the branching fraction for the (highly favored) final state Wb. We published a paper on this in Physical Review Letters. I served as convenor of the lepton-plus-jets subgroup of the top-physics group for a year and a half, and as the leader of the muon-software project for two and a half years. Years earlier, as an undergraduate, I wrote a senior thesis on data taken in 1988-89, a measurement of the cross section for Drell-Yan production of electron pairs with small invariant mass.
o The CLEO experiment at Cornell's Laboratory for Elementary-Particle Physics (1992-1997). http://www.lns.cornell.edu/public/CLEO/ My PhD thesis was on a complete characterization of the decay B->Dlnu using newfangled neutrino-reconstruction techniques.

Follow

2005

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Evidence for Bs0→фф Decay and Measurements of Branching Ratio and ACP for B+→фK+, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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First Measurements of Inclusive W and Z Cross Sections from Run II of the Fermilab Tevatron Collider, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of Partial Widths and Search for Direct CP Violation, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the forward-backward charge asymmetry of electron-positron pairs in pp̅ collisions at sqrt(s)=1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the J/ Ψ meson and b-hadron production cross sections in pp̅ collisions at √S =1960 GeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the moments of the hadronic invariant mass distribution in semileptonic B decays, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the tt̅ production cross section in pp̅ collisions at √s =1.96 TeV using kinematic fitting of b-tagged lepton+jet events, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the tt̅ production cross section in pp̅ collisions at √s=1.96 TeV using lepton + jets events with secondary vertex b -tagging, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the W boson polarization in top decay at CDF at sqrt(s)=1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of W γ and Z γ Production in pp̅ Collisions at √s =1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurements of bottom-antibottom azimuthal production correlations in proton-antiproton collisions at √s =1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Anomalous Kinematics in tt̅ Dilepton Events at CDF II, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for anomalous production of diphoton events with missing transverse energy at CDF and limits on gauge-mediated supersymmetry-breaking models, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for electroweak single-top-quark production in pp̅ collisions at √s =1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Excited and Exotic Electrons in the e γ Decay Channel in pp̅ Collisions at √s =1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for scalar leptoquark pairs decaying to νν̅ qq̅ in pp̅ collisions at √s=1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for ZZ and ZW production in pp̅ collisions at √s=1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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W+W-, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the forward-backward charge asymmetry from W→ production in pp̅ collisions at √s=1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Long-Lived Doubly Charged Higgs Bosons in pp̅ Collisions at √2=1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of Ɓ(t→Wb)/ Ɓ(t→Wb) at the Collider Detector at Fermilab, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the t t̅ production cross section in p p̅ collisions at sqrt(s)=1.96 TeV using lepton plus jets events with semileptonic B decays to muons, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Lambdab0-->ppi and Lambdab0-->pK decays in p [overline p] collisions at sqrt(s)=1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for New Physics Using High-Mass Tau Pairs from 1.96 TeV pp̅ Collisions , D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

2004

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Inclusive Search for Anomalous Production of High-pT Like-Sign Lepton Pairs in pp̅ Collisions at √s =1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the tt̅ Production Cross Section in pp̅ Collisions at √s =1.96 TeV Using Dilepton Events, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Combination of CDF and D0 results on the W boson mass and width, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Direct photon cross section with conversions at CDF, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Inclusive Double-Pomeron Exchange at the Fermilab Tevatron p̅p Collider, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the average time-integrated mixing probability of b-flavored hadrons produced at the Fermilab Tevatron, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the polar-angle distribution of leptons from W boson decay as a function of the W transverse momentum in p̅p collisions at √s=1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Observation of the Narrow State X(3872) J/ψ π+ π- in pp̅ Collisions at √s =1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Optimized search for single-top-quark production at the Fermilab Tevatron, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Bs0 µ+µ- and Bd0 µ+µ- Decays in pp̅ Collisions at √s =1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Doubly Charged Higgs Bosons Decaying to Dileptons in pp̅ Collisions at √s =1:96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Pair Production of Scalar Top Quarks in R-Parity Violating Decay Modes in pp̅ Collisions at √s=1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Underlying event in hard interactions at the Fermilab Tevatron p̅p collider, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

2003

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Central Pseudorapidity Gaps in Events with a Leading Antiproton at the Fermilab Tevatron p̅p Collider, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of Prompt Charm Meson Production Cross Sections in pp̅ Collisions at √s=1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the mass difference m(Ds+)–m (D+) at CDF II, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Associated Production of Υand Vector Boson in pp̅ Collisions at √s =1.8 TeV, D. Acosta , Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for a W1 Boson Decaying to a Top and Bottom Quark Pair in 1.8 TeV pp̅ Collisions, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Lepton Flavor Violating Decays of a Heavy Neutral Particle in pp̅ Collisions at √s =1.8 TeV, D. Acosta , Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Long-Lived Charged Massive Particles in pp̅ Collisions at √s=1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for the flavor-changing neutral current decay D0→µ +µ - in pp̅ collisions at √s =1.96 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for the Supersymmetric Partner of the Top Quark in Dilepton Events from pp̅ Collisions at √s=1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Observation of a narrow resonance of mass 2.46 GeV/c2 decaying to Ds*+ π0 and confirmation of the D*sJ (2317) state, D. Besson, Kenneth Bloom, and Cornell Electronic Storage Ring

2002

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Search for radiative b,-hadron decays in pp̅ collisions at √s=1.8 TeV , D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Diffractive Dijet Production at √s= 630 and 1800 GeV at the Fermilab Tevatron, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of B-meson lifetimes using fully reconstructed B decays produced, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for New Physics in Photon-Lepton Events in pp̅ Collisions at √s= 1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Study of the heavy flavor content of jets produced in association with W bosons in pp̅ collisions at √s =1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Branching ratio measurements of exclusive B+ decays to charmonium with the Collider Detector at Fermilab, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Cross section for forward J/ψ production in pp̅ collisions at √s=1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Limits on Extra Dimensions and New Particle Production in the Exclusive Photon, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the B+ total cross section and B+ differential cross section dσ/dpT in pp̅ collisions at √s=1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for new physics in photon-lepton events in pp̅ collisions at √s =1.8 1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for single-top-quark production in pp̅ collisions at √s =1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for the decay Bs→μ+μ-φ in pp̅ collisions at √s =1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Soft and hard interactions in pp̅ collisions at √s =1800 and 630 GeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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γ Production and Polarization in pp̅ Collisions at √s= 1.8 TeV, D. Acosta, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Cross section and heavy quark composition of γ+μ events produced in pp̅ collisions, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Charged jet evolution and the underlying event in proton-antiproton collisions at 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the Strong Coupling Constant from Inclusive Jet Production at the Tevatron p̅p Collider, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Searches for new physics in events with a photon and b-quark jet at CDF, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Gluinos and Scalar Quarks in pp̅ Collisions at √s = 1.8 TeV Using the Missing Energy plus Multijets Signature, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for New Heavy Particles in the WZ0 Final State in pp̅ Collisions at √s = 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

Study of B0 → J/ψK(*)0π+π- Decays with the Collider Detector at Fermilab, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Online Track Processor for the CDF Upgrade, E.J. Thomson, C. Ciobanu, J.Y. Chung, J. Gerstenslager, J. Hoftiezer, R.E. Hughes, M. Johnson, P. Koehn, C. Neu, C. Sanchez, B.L. Winer, J. Dittman, J. Freeman, S. Holm, J.D. Lewis, C.J. Lin, T. Shaw, T. Wesson, Kenneth Bloom, D. Gerdes, N. Goldschmidt, J. Dawson, and W. Haberichter

2001

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Measurement of dσ/dM and Forward-Backward Charge Asymmetry for High-Mass Drell-Yan e+e- Pairs from pp̅ Collisions at √s = 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Observation of orbitally excited B mesons in pp̅ collisions at √s =1.8  TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Charged-Particle Multiplicity pp̅ Collisions at √s = 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Double Diffraction Dissociation at the Fermilab Tevatron Collider, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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First Measurement of the Ratio B (tWb)/ B (tWq) and Associated Limit on the Cabibbo-Kobayashi-Maskawa Element |Vtb|, T. Affolder , Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of dσ/dy for high mass Drell-Yan e+e- pairs from pp̅ collisions at √s =1.8 TeV  , T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of dσ/dy for high mass Drell-Yan e+e- pairs from pp̅ collisions at √s =1.8 TeV  , T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the inclusive jet cross section in pp̅ collisions at √s =1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the top quark mass with the collider detector at Fermilab  , T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the Top Quark pT Distribution, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the tt̅ production cross section in pp̅ collisions at √s =1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the two-jet differential cross section in pp̅ collisions at √s=1800 GeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the W boson mass with the Collider Detector at Fermilab  , T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Observation of Diffractive J/ψ Production at the Fermilab Tevatron, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Production of χ c1 and χ c2 in pp̅ Collisions at √s= 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Gluinos and Squarks Using Like-Sign Dileptons in pp̅ Collisions at √s= 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for narrow diphoton resonances and for γγ+W/Z signatures in pp̅ collisions at √s=1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Neutral Supersymmetric Higgs Bosons in pp̅ Collisions at √s = 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Quark-Lepton Compositeness and a Heavy W′ Boson Using the eν Channel in pp̅ Collisions at √s = 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for the supersymmetric partner of the top quark in pp̅ collisions at √s=1.8 TeV, T. Affolder , Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Tests of enhanced leading order QCD in W boson plus jets events from 1.8 TeV p̅p collisions, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

2000

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Measurement of bb̅ rapidity correlations in pp̅ collisions at √s =1.8 TeV, F. Abe, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for a W′ Boson via the Decay Mode W′→μν μ in 1.8 TeV pp̅ Collisions, F. Abe, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Measurement of the differential dijet mass cross section in pp̅ collisions at √s =1.8 TeV, D. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Search for Color Singlet Technicolor Particles in pp̅ Collisions at √s = 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Transverse Momentum and Total Cross Section of e+e- Pairs in the Z-Boson Region, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Observation of Diffractive b-Quark Production at the Fermilab Tevatron, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Diffractive Dijets with a Leading Antiproton in p̅p Collisions at √s = 1800 GeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Dijet Production by Double Pomeron Exchange at the Fermilab Tevatron  , T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Direct Measurement of the W Boson Width in pp̅ Collisions at √s = 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration

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Limits on Light Gravitino Production and New Processes with Large Missing Transverse Energy in pp̅ Collisions at √s = 1.8 TeV, T. Affolder, Kenneth Bloom, and Collider Detector at Fermilab Collaboration