Does antihydrogen 1S-2S match hydrogen at 10^-15? · revision history

Revision 2

Accepted · core change · record

Changes against revision 1:

Title · changed
Revision 1: Does antihydrogen 1S-2S match hydrogen at 1e-15?
Revision 2: Does antihydrogen 1S-2S match hydrogen at $10^{-15}$?
Plain
Antihydrogen (an antiproton bound to a positron) should have exactly the same energy levels as hydrogen if matter and antimatter mirror each other perfectly. The main ultraviolet line has been compared to a few parts in $10^{12}$; hydrogen itself is known about a thousand times better.
Precise · changed · core
Revision 1: ALPHA measured the antihydrogen $1\mathrm{S}-2\mathrm{S}$ two-photon frequency in agreement with hydrogen at about 2e-12 relative precision (2018). Determine whether nu_1S2S(Hbar) - nu_1S2S(H) is nonzero at the 1e-15 level, approaching the hydrogen precision of about 4e-15.
Revision 2: ALPHA measured the antihydrogen $1\mathrm{S}-2\mathrm{S}$ two-photon frequency in agreement with hydrogen at about $2 \times 10^{-12}$ relative precision (2018). Determine whether nu_1S2S(Hbar) - nu_1S2S(H) is nonzero at the $10^{-15}$ level, approaching the hydrogen precision of about 4e-15.
Settled by · changed · core
Revision 1: Antihydrogen 1S-2S spectroscopy with laser-cooled, magnetically trapped atoms reaching sub-kHz resolution and 1e-15 accuracy.
Revision 2: Antihydrogen 1S-2S spectroscopy with laser-cooled, magnetically trapped atoms reaching sub-kHz resolution and $10^{-15}$ accuracy.
Kind
well-posed
Answer type
yes-no
References
(empty)
Literature status
open
Status note
ALPHA demonstrated laser cooling of antihydrogen in 2021, a prerequisite for the next precision step.
Posed since
(empty)

Decisions