Speaker
Description
The Standard Model Extension (SME) [1, 2] serves as a motivation for many experiments
performing precision tests of the CPT symmetry. It includes all CPT and Lorentzviolating
operators in addition to the Standard Model Lagrangian and hence, manifesting
Lorentz and CPT violating signals in different experimental searches.
According to the SME, the shifts in the hyper-fine energy levels of deuterium depend on
the exponents of the relative momentum of the proton in the deuteron core. This enhances
the sensitivity of certain coefficients for Lorentz and CPT violation by 9 orders of magnitude
and even up to 18 orders of magnitude for certain other coefficients as compared to that of
hydrogen [3]. SME also predicts experimental signals at twice the sidereal frequency, which
can be measured in the hyper-fine Zeeman transitions with $\Delta F \neq 0$ in deuterium [3]. One
of these transitions which we aim to measure is ($F = \frac{3}{2}, M_F = -\frac{1}{2}$) $\rightarrow$ ($F = \frac{1}{2}, M_F = -\frac{1}{2}$),
which has a minima at 3.889 mT. The simulations and experimental progress towards this
measurement using an in-beam Rabi type spectroscopy technique will be presented. A
double split ring resonator [4, 5] will be used to drive these hyper-fine transitions. The
characterisation and performance of the prototype of this resonator shall also be discussed.
References
[1] Don Colladay and V. Alan Kostelecký. CPT violation and the standard model. Phys.
Rev. D, 55:6760–6774, Jun 1997.
[2] V. Alan Kostelecký. Gravity, lorentz violation, and the standard model. Phys. Rev. D,
69:105009, May 2004.
[3] V. Alan Kostelecký and Arnaldo J. Vargas. Lorentz and cpt tests with hydrogen,
antihydrogen, and related systems. Phys. Rev. D, 92:056002, Sep 2015.
[4] W Froncisz and James S Hyde. The loop-gap resonator: a new microwave lumped
circuit esr sample structure. Journal of Magnetic Resonance (1969), 47(3):515–521,
1982.
[5] M. Mehdizadeh, T. K. Ishii, J. S. Hyde, and W. Froncisz. Loop-gap resonator: A
lumped mode microwave resonant structure. IEEE Transactions on Microwave Theory
and Techniques, 31(12):1059–1064, Dec 1983.
| Scientific topic | Symmetries and Interactions |
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