Borchert, Matthias J - Search Results

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Challenging the Standard Model by high precision comparisons of the fundamental properties of antiprotons and protons / Borchert, Matthias Joachim
This thesis describes high precision measurements on the fundamental properties of the antiproton, namely the charge-to-mass ratio and the magnetic moment [...]
CERN-THESIS-2021-230 - Hannover : Gottfried Wilhelm Leibniz Universität, 2021-12-14.

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Constraints on the Coupling between Axionlike Dark Matter and Photons Using an Antiproton Superconducting Tuned Detection Circuit in a Cryogenic Penning Trap / Devlin, Jack A. (Wako, RIKEN ; CERN) ; Borchert, Matthias J. (Wako, RIKEN ; Braunschweig, Phys. Tech. Bund. ; Leibniz U., Hannover) ; Erlewein, Stefan (Wako, RIKEN ; CERN) ; Fleck, Markus (Wako, RIKEN ; Tokyo U., Komaba) ; Harrington, James A. (Wako, RIKEN ; Heidelberg, Max Planck Inst.) ; Latacz, Barbara (Wako, RIKEN) ; Warncke, Jan (Wako, RIKEN) ; Wursten, Elise (Wako, RIKEN ; CERN) ; Bohman, Matthew A. (Wako, RIKEN ; Heidelberg, Max Planck Inst.) ; Mooser, Andreas H. (Wako, RIKEN ; Heidelberg, Max Planck Inst.) et al.
We constrain the coupling between axionlike particles (ALPs) and photons, measured with the superconducting resonant detection circuit of a cryogenic Penning trap. By searching the noise spectrum of our fixed-frequency resonant circuit for peaks caused by dark matter ALPs converting into photons in the strong magnetic field of the Penning-trap magnet, we are able to constrain the coupling of ALPs with masses around $2.7906-2.7914\,\textrm{neV/c}^2$ to $g_{a\gamma}< 1 \times 10^{-11}\,\textrm{GeV}^{-1}$. [...]
arXiv:2101.11290.- 2021-01-26 - 7 p. - Published in : Phys. Rev. Lett. 126 (2021) 041301 Fulltext: 2101.11290 - PDF; PhysRevLett.126 - PDF;

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Cryogenic $^9$Be$^+$ Penning trap for precision measurements with (anti-)protons / Niemann, Malte (Leibniz U., Hannover) ; Meiners, Teresa (Leibniz U., Hannover) ; Mielke, Johannes (Leibniz U., Hannover) ; Borchert, Matthias Joachim (Leibniz U., Hannover) ; Cornejo, Juan Manuel (Leibniz U., Hannover) ; Ulmer, Stefan (Leibniz U., Hannover) ; Ospelkaus, Christian (Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.)
Cooling and detection schemes using laser cooling and methods of quantum logic can contribute to high precision CPT symmetry tests in the baryonic sector. This work introduces an experiment to sympathetically cool protons and antiprotons using the Coulomb interaction with a $^9$Be$^+$ ion trapped in a nearby but separate potential well. [...]
arXiv:1906.09249.- 2019-12-20 - 9 p. - Published in : Meas. Sci. Technol. 31 (2020) 035003 Fulltext: fulltext1740961 - PDF; 1906.09249 - PDF;

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Superconducting solenoid system with adjustable shielding factor for precision measurements of the properties of the antiproton / Devlin, Jack A (RIKEN (main) ; CERN) ; Wursten, Elise (RIKEN (main) ; CERN) ; Harrington, James A (RIKEN (main) ; Heidelberg, Max Planck Inst.) ; Higuchi, Takashi (RIKEN (main) ; U. Tokyo (main)) ; Blessing, Pascal E (RIKEN (main) ; Darmstadt, GSI) ; Borchert, Matthias J (RIKEN (main) ; Leibniz U., Hannover) ; Erlewein, Stefan (RIKEN (main) ; CERN ; Heidelberg, Max Planck Inst.) ; Hansen, Jannek J (RIKEN (main)) ; Morgner, Jonathan (RIKEN (main) ; Leibniz U., Hannover) ; Bohman, Matthew A (RIKEN (main) ; Heidelberg, Max Planck Inst.) et al.
A superconducting self-shielding three-solenoid system with an adjustable shielding factor is developed, implemented, and characterized using a single antiproton in a Penning trap. With the tuned system, we suppress external magnetic field disturbances by up to a factor of 225 ± 15, allowing antiproton-to-proton charge-to-mass ratio comparisons with fourfold reduced frequency fluctuations and antiproton magnetic moment determinations with tenfold reduced uncertainty..
2019 - 9 p. - Published in : Phys. Rev. Applied 12 (2019) 044012 Fulltext from publisher: PDF;

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See also: similar author names
3	Borchert, M
6	Borchert, M J
2	Borchert, M.
5	Borchert, M.J.
2	Borchert, Matthias J.
2	Borchert, Matthias Joachim

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