Show simple item record

dc.contributor.advisorGabrielse, Gerald
dc.contributor.advisorGreiner, Markus
dc.contributor.advisorReece, Matthew
dc.contributor.authorPanda, Cristian Daniel
dc.date.accessioned2019-08-08T09:21:37Z
dc.date.created2019-03
dc.date.issued2019-01-07
dc.date.submitted2019
dc.identifier.citationPanda, Cristian Daniel. 2019. Order of Magnitude Improved Limit on the Electric Dipole Moment of the Electron. Doctoral dissertation, Harvard University, Graduate School of Arts & Sciences.
dc.identifier.urihttp://nrs.harvard.edu/urn-3:HUL.InstRepos:41121303*
dc.description.abstractThe Standard Model of particle physics accurately describes with amazing precision all particle physics measurements made in the laboratory. However, it is unable to answer many central questions that arise from cosmological observations, such as the nature of dark matter and why matter dominates over antimatter throughout the Universe. Theories containing particles and interactions beyond the standard model, such as models incorporating supersymmetry, may explain these phenomena. Such particles can come into virtual existence in the vacuum and then interact with real particles to modify their properties. For example, the existence of very massive particles whose interactions violate time-reversal symmetry, as needed to explain the cosmological matter–antimatter asymmetry, gives rise to an electric dipole moment along the spin axis of the electron. To date no electric dipole moments (EDM), of the electron or other fundamental particles, have been observed. However, dipole moments only slightly smaller than current bounds can arise from new particles more massive than any known to exist. Here we present a new measurement of the electron's electric dipole moment (eEDM), $d_e$=\result, obtained by measuring the spin precession of electrons subjected to the huge intramolecular electric field accessible in the thorium monoxide molecule. The sensitivity of our measurement is one order of magnitude better than any previous work and probes for the existence of new particles with mass far beyond the direct reach of the Large Hadron Collider. Since our measurement is consistent with zero, we report an upper limit of $|d_e|$<\upperlimitFeldman, which sets very strong constraints on a wide range of theories that predict new physics at energy scales directly accessible to colliders.
dc.description.sponsorshipPhysics
dc.format.mimetypeapplication/pdf
dc.language.isoen
dash.licenseLAA
dc.subjectelectron
dc.subjectEDM
dc.subjectelectric dipole moment
dc.subjectdipole
dc.subjectbeyond the Standard Model
dc.subjectBSM
dc.subjectCP
dc.subjectsymmetry
dc.subjectfundamental
dc.subjectsuper-symmetry
dc.subjectmolecule
dc.subjectbeam
dc.subjectThO
dc.subjectthorium monoxide
dc.subjectspin precession
dc.subjectSTIRAP
dc.subjectmatter-antimmater asymmetry
dc.subjectBAU
dc.subjectdark matter
dc.subjectspin
dc.titleOrder of Magnitude Improved Limit on the Electric Dipole Moment of the Electron
dc.typeThesis or Dissertation
dash.depositing.authorPanda, Cristian Daniel
dc.date.available2019-08-08T09:21:37Z
thesis.degree.date2019
thesis.degree.grantorGraduate School of Arts & Sciences
thesis.degree.grantorGraduate School of Arts & Sciences
thesis.degree.levelDoctoral
thesis.degree.levelDoctoral
thesis.degree.nameDoctor of Philosophy
thesis.degree.nameDoctor of Philosophy
dc.type.materialtext
thesis.degree.departmentPhysics
thesis.degree.departmentPhysics
dash.identifier.vireo
dc.identifier.orcid0000-0002-2284-9756
dash.author.emailcristian.panda@gmail.com


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record