TY - JOUR

T1 - Sensitivity to new physics of isotope-shift studies using the coronal lines of highly charged calcium ions

AU - Rehbehn, Nils Holger

AU - Rosner, Michael K.

AU - Bekker, Hendrik

AU - Berengut, Julian C.

AU - Schmidt, Piet O.

AU - King, Steven A.

AU - Micke, Peter

AU - Gu, Ming Feng

AU - Müller, Robert

AU - Surzhykov, Andrey

AU - López-Urrutia, José R.Crespo

N1 - Funding Information: Financial support was provided by the Max-Planck-Gesellschaft and the Physikalisch-Technische Bundesanstalt. We acknowledge support from the Max Planck-Riken-PTB Center for Time, Constants and Fundamental Symmetries, the Deutsche Forschungsgemeinschaft through Grants No. SCHM2678/5-1 and No. SU 658/4-1, the collaborative research centers “SFB 1225 (ISOQUANT)” and “SFB 1227 (DQ-mat),” and Germany's Excellence Strategy-EXC-2123/1 QuantumFrontiers-390837967. This project also received funding from the European Metrology Programme for Innovation and Research (EMPIR) cofinanced by the Participating 5 States and from the European Union's Horizon 2020 research and innovation programme (Project No. 17FUN07 CC4C). J.C.B. was supported in this work by the Alexander von Humboldt Foundation and the Australian Research Council (DP190100974).

PY - 2021/4/21

Y1 - 2021/4/21

N2 - Promising searches for new physics beyond the current standard model (SM) of particle physics are feasible through isotope-shift spectroscopy, which is sensitive to a hypothetical fifth force between the neutrons of the nucleus and the electrons of the shell. Such an interaction would be mediated by a new particle which could in principle be associated with dark matter. In so-called King plots, the mass-scaled frequency shifts of two optical transitions are plotted against each other for a series of isotopes. Subtle deviations from the expected linearity could reveal such a fifth force. Here, we study experimentally and theoretically six transitions in highly charged ions of Ca, an element with five stable isotopes of zero nuclear spin. Some of the transitions are suitable for upcoming high-precision coherent laser spectroscopy and optical clocks. Our results provide a sufficient number of clock transitions for - in combination with those of singly charged Ca+ - application of the generalized King plot method. This will allow future high-precision measurements to remove higher-order SM-related nonlinearities and open a door to yet more sensitive searches for unknown forces and particles.

AB - Promising searches for new physics beyond the current standard model (SM) of particle physics are feasible through isotope-shift spectroscopy, which is sensitive to a hypothetical fifth force between the neutrons of the nucleus and the electrons of the shell. Such an interaction would be mediated by a new particle which could in principle be associated with dark matter. In so-called King plots, the mass-scaled frequency shifts of two optical transitions are plotted against each other for a series of isotopes. Subtle deviations from the expected linearity could reveal such a fifth force. Here, we study experimentally and theoretically six transitions in highly charged ions of Ca, an element with five stable isotopes of zero nuclear spin. Some of the transitions are suitable for upcoming high-precision coherent laser spectroscopy and optical clocks. Our results provide a sufficient number of clock transitions for - in combination with those of singly charged Ca+ - application of the generalized King plot method. This will allow future high-precision measurements to remove higher-order SM-related nonlinearities and open a door to yet more sensitive searches for unknown forces and particles.

UR - http://www.scopus.com/inward/record.url?scp=85105081433&partnerID=8YFLogxK

U2 - 10.1103/PhysRevA.103.L040801

DO - 10.1103/PhysRevA.103.L040801

M3 - Article

AN - SCOPUS:85105081433

VL - 103

JO - Physical Review A

JF - Physical Review A

SN - 2469-9926

IS - 4

M1 - L040801

ER -