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Paul Indelicato seminar at NUS, 16 November 2016

by MajuLab editor - published on

Title: The proton and deuteron size revisited: the puzzle gets more puzzling!
Who: Paul Indélicato (Laboratoire Kastler-Brossel, CNRS, UPMC, ENS, SU)
When: Wed, 16-Nov-2016, 11am
Where: Physics Conference Room (S11-02-07)

Abstract

In 2010, our collaboration published a measurement of the 2s Lamb shift in muonic hydrogen [1]. This measurement allowed deriving a completely new value the proton charge radius. This value, while roughly 10 times more accurate than the one derived from hydrogen and deuterium spectroscopy or electron-proton elastic scattering was 4% lower, and 5 standard deviations away from the CODATA 2010 value. In 2013 we published the measurement of a second line in muonic hydrogen, allowing for the measurement of the hyperfine structure of the 2s level. This measurement allowed to derive the size of the Zemach’s radius and of the magnetic moment distribution, and an improvement of the accuracy of the proton charge radius [2]. The difference was then increased to 6.9 standard deviations. We have now measured, for the first time, 3 lines in muonic deuterium [3]. I will report on this new measurement, show how it impacts the proton size puzzle. I will discuss possible reasons and implications for physics of the large disagreement between the different measurements of the proton and deuteron size.

Bibliography

[1] The size of the proton, R. Pohl, A. Antognini, F. Nez, F.D. Amaro, F. Biraben, J.M.R. Cardoso, D.S. Covita, A. Dax, S. Dhawan, L.M.P. Fernandes, A. Giesen, T. Graf, T.W. Hänsch, P. Indelicato, L. Julien, C.-Y. Kao, P. Knowles, E.-O.L. Bigot, Y.-W. Liu, J.A.M. Lopes, L. Ludhova, C.M.B. Monteiro, F. Mulhauser, T. Nebel, P. Rabinowitz, J.M.F. dos Santos, L.A. Schaller, K. Schuhmann, C. Schwob, D. Taqqu, J.F.C.A. Veloso and F. Kottmann. Nature 466, 213-216 (2010). [2] Proton Structure from the Measurement of 2S-2P Transition Frequencies of Muonic Hydrogen, A. Antognini, F. Nez, K. Schuhmann, F.D. Amaro, F. Biraben, J.M.R. Cardoso, D.S. Covita, A. Dax, S. Dhawan, M. Diepold, L.M.P. Fernandes, A. Giesen, A.L. Gouvea, T. Graf, T.W. Hänsch, P. Indelicato, L. Julien, C.-Y. Kao, P. Knowles, F. Kottmann, E.-O. Le Bigot, Y.-W. Liu, J.A.M. Lopes, L. Ludhova, C.M.B. Monteiro, F. Mulhauser, T. Nebel, P. Rabinowitz, J.M.F. dos Santos, L.A. Schaller, C. Schwob, D. Taqqu, J.F.C.A. Veloso, J. Vogelsang and R. Pohl. Science 339, 417-420 (2013). [3] Laser spectroscopy of muonic deuterium, R. Pohl, F. Nez, L.M.P. Fernandes, F.D. Amaro, F. Biraben, J.M.R. Cardoso, D.S. Covita, A. Dax, S. Dhawan, M. Diepold, A. Giesen, A.L. Gouvea, T. Graf, T.W. Hänsch, P. Indelicato, L. Julien, P. Knowles, F. Kottmann, E.-O. Le Bigot, Y.-W. Liu, J.A.M. Lopes, L. Ludhova, C.M.B. Monteiro, F. Mulhauser, T. Nebel, P. Rabinowitz, J.M.F. dos Santos, L.A. Schaller, K. Schuhmann, C. Schwob, D. Taqqu, J.F.C.A. Veloso and A. Antognini. Science 353, 669-673 (2016).

Biography

Pr. Paul Indelicato, Deputy director of the office of Thierry Mandon, in charge of Research, Secretary of State for Research and Higher Education.
Director of Research, CNRS
Laboratoire Kastler-Brossel (CNRS, ENS-PSL, Collège de France, Sorbonne University—UPMC)
Member of the Extreme Matter Institute (Helmholtz Alliance, « Cosmic Matter in the Laboratory » )

Research: theoretical and experimental work in atomic physics and in medium energy particle physics. Measurement of the pion mass. QED in highly charged ions; Superheavy elements. Development of the MCDF-gme relativistic atomic structure code. X-ray metrology on highly-charged ions. Bound-state QED calculations. Tests of bound-state QED in strong field and QCD at low energy. CREMA collaboration: Laser measurement of the Lamb shift in muonic light atoms. GBAR collaboration: measurement of gravitational effects on antihydrogen.

Previous responsibilities: Director of the Kastler Brossel laboratory (2006-2012)
Vice-President for Research and Innovation of Pierre and Marie Curie University (2012-2016)
Deputy dean of the physics department, University Pierre and Marie Curie (2003-2005)
Editor European Journal of Physics (2004-2011), Hyperfine interactions.

Awards and medals:

  • Chevallier de la Légion d’Honneur (January 1st, 2015)
  • Fellow of the American Physical Society (3 novembre 2003) "For his outstanding contributions both in new measurements and new theoretical methods to understand QED and QCD"
  • Award of the scientific Council of the National Computer Center for Universities CINES (2002)
  • Aimé Cotton award, French Physical Society (1994)
  • Bronze Medal, Centre National de La Recherche Scientifique–CNRS (1987)

Publications:
Web Page: http://www.lkb.ens.fr/-Indelicato-Paul-
Google scholar: https://scholar.google.fr/citations... (h-index 46, 7985 citations)
Researcher ID: http://www.researcherid.com/rid/D-7... (304 references, h-index 39, 5608 publications)