Prof. Krishna Kumar is an experimental particle/nuclear physicist. His current research focuses on precision measurements of weak neutral current interactions using fixed-target parity-violating electron scattering, and searches for neutrinoless double-beta decay.

• Are there (as yet undetected) super-weak forces at sub-attometer length scales that shaped the evolution of the early universe?
• Do neutrons in a heavy nucleus occupy a slightly larger volume than the protons, thus forming a "neutron skin"?
• Are neutrinos their own anti-particles?
• Is lepton number conserved?
• Can quarks, gluons, their motion and self-interactions account for the observed properties of the proton?

Research Topics:

Parity-Violating Electron Scattering Experiments

Search for Neutrino-less Double Beta Decay

Selected Recent Talks:

• "Electrons are Not Ambidextrous: New Insights from a Subatomic Matter of Fact", colloquium at SLAC, May 2013.

• "Low Energy Standard Model Tests with Parity-Violating Electron Scattering", invited talk at ELBA XII Workshop, Elba, Italy, June 2012

• "Parity-Violating Electron Scattering: Introduction and the Moller Process", invited talk at the Workshop on Fundamental Physics at the Intensity Frontier, Gaithersburg, MD, December 2011

• "High Precision Electroweak Measurements with Electrons and Muons", plenary talk at the 10th ICFA Seminar (International Committee for Future Accelerators), CERN, Geneva, Switzerland, October 2011.

• "Searches for BSM Physics at Low Energy", Invited Plenary talk at the Fall Meeting of the Division of Particles and Fields (DPF2011), Brown University, USA, August 2011

• "What is the Proton Made of?" Invited Pedagogical Lecture at the 19th Particles and Nuclei International Conference (PANIC11), MIT, Cambridge, USA, July 2011

• "The MOLLER Project at Jefferson Laboratory", presentation to the US Department of Energy, Division of Nuclear Physics, Dec 2010

• "Parity Violation and Standard Model Tests", plenary talk at SPIN2010: 19th International Symposium on Spin Physics, Juelich, Germany, October 2010.

• "Beyond the Standard Model with Electron and Muon Beams", plenary talk at INPC2010: International Nuclear Physics Conference, Vancouver, BC, Canada, July 2010.

• "Long Range Plan: Neutrinos and Fundamental Symmetries", plenary talk at the Jefferson Laboratory Users Group Meeting, June 18, 2007.

• "Conclusions and Perspectives", conference summary talk at the International WorkshopFrom Parity Violation to Hadronic Structure and More....(Part III), Milos, Greece, May 20, 2006.

A recent CV can be viewed here

A full list of publications can be viewed here

Selected Recent Publications:

• "Observation of 2-neutrino Double-Beta Decay in ¹³⁶Xe with EXO-200", EXO-200 Collaboration, N. Ackerman et. al, arXiv:1108:4193 [nucl-ex], accepted for publication in Phy.Rev.Lett.

  "New Precision Limit on the Strange Quark Form Factors of the Proton", HAPPEX Collaboration, Z. Ahmed et. al, arXiv:1107:0913v1 [nucl-ex], submitted to Phys.Rev.Lett.

• "Low Energy Tests of the Standard Model: The 12 GeV Parity Violation Program at Jefferson Laboratory", K.S. Kumar, Int.J.Mod.Phys.E19:927-937 (2010).

• "Characterization of Large Area APDs for the EXO-200 Detector", EXO-200 Collaboration, R. Nielson et. al, arXiv:0906.2499 [physics.ins-det], Nucl.Instrum.Meth.A608:68-75 (2009).

• "Precision Measurements of the Nucleon Strange Form Factors at Q² ~ 0.1 GeV²", HAPPEX Collaboration, A. Acha et. al, nucl-ex/0609002, Phys.Rev.Lett. 98:032301 (2007)

• "Constraints on the Nucleon Strange Form Factors at Q² ~ 0.1 GeV²", HAPPEX Collaboration, nucl-ex/0506011, Phys.Lett.B635:275-279 (2006)

• "Parity-Violating Electron Scattering from 4He and the Strange Electric Form Factor of the Nucleon", HAPPEX Collaboration, K.A. Aniol et. al, nucl-ex/0506010, Phys.Rev.Lett. 96:022003 (2006).

• "A Precision Measurement of the Weak Mixing Angle in Møller Scattering", E158 Collaboration, P.L. Anthony et. al, hep-ex/0504049, Phy.Rev.Lett. 95:081601 (2005).

• "Flux Profile Scanners for Scattered High Energy Electrons", R.S. Hicks et al, Nucl.Instrum.Meth. A553:470-482 (2005).

• STRANGE QUARKS AND PARITY VIOLATION, K.S. Kumar (Massachusetts U., Amherst), P.A. Souder (Syracuse U.). 2000. Prog.Part.Nucl.Phys.45:S333-S395,2000,pdf format