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Richard Ledbed's research involves studying the properties of, and interactions between, particles at the most elementary level. One of the most fruitful ideas in the history of particle physics has been the recognition that beautiful symmetries interlace the fabric of physical theories, and not only tell us a great deal about how particles interact, but even restrict the types of particles that can exist. He has worked in a number of theoretical subfields of particle physics, for example: i) What if the structure of spacetime is not smooth, but rather coordinate operators fail to commute, just like x and px in quantum mechanics? How can we tell? ii) Why is there a three-fold replication of fermions in the Standard Model? For example, the muon appears to be just a heavy replica of the electron. If we build a symmetry that explains this redundancy, what does it imply about neutrino masses and mixing? iii) The theory of strong interactions, QCD, has three color charges. What if this number were different? How would properties like the mass of protons and neutrons change? iv) Why has it taken so long to discover ``exotic'' strongly interacting particles that are bound states in categories other than triples of quarks (like protons and neutrons) or quark-antiquark pairs (like pions), and how are these exotics assembled?
Ph.D. University of California-Berkeley 1994
Spectroscopy of Exotic Hadrons Formed from Dynamical Diquarks, Richard F. Lebed, Physical Review D [under review] (2017).
Heavy-Quark Hybrid Mass Splittings: Hyperfine and "Ultrafine", Richard F. Lebed and Eric S. Swanson, Physical Review D [under review] (2017).
Quarkonium h States As Arbiters of Exoticity, Richard F. Lebed and Eric S. Swanson, Physical Review D (2017).
Model-Independent Constraints on Hadronic Form Factors with Above-Threshold Poles, Irinel Caprini, Benjamin Grinstein, and Richard F. Lebed, Physical Review D (2017).
Richard F. Lebed, Ryan E. Mitchell, and Eric S. Swanson, Heavy Quark QCD Exotica, Progress in Particle & Nuclear Physics (2016).
Stanley J. Brodsky, Richard F. Lebed, and Valery E. Lyubovitskij, QCD Compositeness As Revealed in Exclusive Vector Boson Reactions Through Double-Photon Annihilation: e+e- to gamma V^0, Physics Letters B (2017).
Richard F. Lebed, How Often Do Diquarks Form? A Very Simple Model, Physical Review D (2016).
Richard F. Lebed, Exotic Discoveries in Familiar Places: Theory of the Onia and Exotics, Proceedings of Science BEAUTY2016 (2016).
Henry Lamm and Richard F. Lebed, High Resolution Nonperturbative Light-Front Simulations of the True Muonium Atom, Physical Review D (2016).
Richard F. Lebed and Antonio D. Polosa, chi_c0(3915) As the Lightest ccss State, Physical Review D (2016).
Henry Lamm and Richard F. Lebed, Nonperturbative True Muonium on the Light Front with TMSWIFT, Few Body Systems (2016).
R.A. Briceno et al., Issues and Opportunities in Exotic Hadrons, Chinese Physics C (2016).
Richard F. Lebed, Do the P^+_c Pentaquarks Have Strange Siblings?, Physical Review D (2015).
Richard F. Lebed, Diquark Substructure in Phi Photoproduction, Physical Review D (2015).
Benjamn Grinstein and Richard F. Lebed, Above-Threshold Poles in Model-Independent Form Factor Parametrizations, Physical Review D (2015).
Richard F. Lebed, The Pentaquark Candidates in the Dynamical Diquark Picture, Physics Letters B (2015).
Stanley J. Brodsky and Richard F. Lebed, The QCD Dynamics of Tetraquark Production, Physical Review D (2015).
Samuel H. Blitz and Richard F. Lebed, Tetraquark Cusp Effects from Diquark Pair Production, Physical Review D (2015).
Summer 2022 | |
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Course Number | Course Title |
PHY 792 | Research |
PHY 799 | Dissertation |
Spring 2022 | |
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Course Number | Course Title |
PHY 462 | Particle and Nuclear Physics |
PHY 493 | Honors Thesis |
PHY 495 | Project Research |
PHY 792 | Research |
PHY 799 | Dissertation |
Fall 2021 | |
---|---|
Course Number | Course Title |
PHY 314 | Quantum Physics I |
PHY 493 | Honors Thesis |
PHY 495 | Project Research |
PHY 792 | Research |
PHY 799 | Dissertation |
Summer 2021 | |
---|---|
Course Number | Course Title |
PHY 792 | Research |
PHY 799 | Dissertation |
Spring 2021 | |
---|---|
Course Number | Course Title |
PHY 462 | Particle and Nuclear Physics |
PHY 493 | Honors Thesis |
PHY 495 | Project Research |
PHY 792 | Research |
PHY 799 | Dissertation |
Fall 2020 | |
---|---|
Course Number | Course Title |
PHY 314 | Quantum Physics I |
PHY 493 | Honors Thesis |
PHY 495 | Project Research |
PHY 792 | Research |
PHY 799 | Dissertation |
Summer 2020 | |
---|---|
Course Number | Course Title |
PHY 792 | Research |
PHY 799 | Dissertation |
Spring 2020 | |
---|---|
Course Number | Course Title |
PHY 462 | Particle and Nuclear Physics |
PHY 493 | Honors Thesis |
PHY 495 | Project Research |
PHY 792 | Research |
PHY 799 | Dissertation |
Fall 2019 | |
---|---|
Course Number | Course Title |
PHY 314 | Quantum Physics I |
PHY 493 | Honors Thesis |
PHY 792 | Research |
PHY 799 | Dissertation |
Summer 2019 | |
---|---|
Course Number | Course Title |
PHY 799 | Dissertation |
Spring 2019 | |
---|---|
Course Number | Course Title |
PHY 462 | Particle and Nuclear Physics |
PHY 493 | Honors Thesis |
PHY 495 | Project Research |
PHY 499 | Individualized Instruction |
PHY 792 | Research |
PHY 799 | Dissertation |
Fall 2018 | |
---|---|
Course Number | Course Title |
PHY 314 | Quantum Physics I |
PHY 493 | Honors Thesis |
PHY 495 | Project Research |
PHY 499 | Individualized Instruction |
PHY 792 | Research |
Spring 2018 | |
---|---|
Course Number | Course Title |
PHY 462 | Particle and Nuclear Physics |
PHY 492 | Honors Directed Study |
PHY 495 | Project Research |
PHY 499 | Individualized Instruction |
PHY 792 | Research |
PHY 799 | Dissertation |
Fall 2017 | |
---|---|
Course Number | Course Title |
PHY 314 | Quantum Physics I |
PHY 495 | Project Research |
PHY 499 | Individualized Instruction |
PHY 792 | Research |
PHY 799 | Dissertation |