Measurement of the 
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 Transition in Hyd

Brandt, Adam; Cooper, Samuel; Rasor, Cory; Burkley, Zakary; Matveev, A.

doi:10.1103/physrevlett.128.023001

Cited by 48 publications

(37 citation statements)

References 39 publications

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“…This led to what was dubbed as the proton charge radius puzzle [5], triggering many experimental and theoretical efforts striving for a solution. The most recent determinations of the radius from e-p scattering [6] or from the Lamb shift [7] and the 2S − 4P transition [8] in hydrogen are agreeing with the value from muonic hydrogen, while the most recent measurement of the 2S 1/2 − 8D 5/2 transition in hydrogen is disagreeing by around 3σ [9]. Measurements of the 1S − 3S transition in hydrogen support both the smaller radius [10] as well as the originally accepted value [11].…”

Section: Introductionsupporting

confidence: 52%

Muonium Lamb shift: theory update and experimental prospects

Janka,

Ohayon,

Crivelli

2021

Preprint

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We review the theory of the Lamb shift for muonium, provide an updated numerical value and present the prospects of the Mu-MASS collaboration at PSI to improve upon their recent measurement. Due to its smaller nuclear mass, the contributions of the higher-order recoil corrections (160 kHz level) and nucleus self-energy (40 kHz level) are enhanced for muonium compared to hydrogen where those are below the level of the latest measurement performed by Hessels et al. and thus could not be tested yet. The ongoing upgrades to the Mu-MASS setup will open up the possibility to probe these contributions and improve the sensitivity of this measurement to searches for new physics in the muonic sector.

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Section: Introductionsupporting

confidence: 52%

Muonium Lamb shift: theory update and experimental prospects

Janka,

Ohayon,

Crivelli

2021

Preprint

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“…It is important to point out that the recent new experimental measurement of the 2s 1/2 − 8d 5/2 transition frequency is based on the second type of experiment discussed above. As stated in [29], the QIE is negligible. However, we find that NR is −1174.02 Hz and has an experimental error order of 2 kHz [29].…”

Section: Experiments Based On 2s State Quenchingmentioning

confidence: 92%

“…As stated in [29], the QIE is negligible. However, we find that NR is −1174.02 Hz and has an experimental error order of 2 kHz [29]. A simple analysis of the involvement of NR corrections, listed in Table 5, in determining the proton charge radius and the Rydberg constant can be found in [95].…”

Section: Experiments Based On 2s State Quenchingmentioning

confidence: 92%

“…Although indispensable progress has been achieved in [22] by taking into account nonresonant effects in the scattering cross section, and quantum interference as their most significant part, the question of its influence on other spectroscopic precision experiments is currently being discussed in [25,26,27,28]. In particular, the results of recent work on the measurement of the 2s − 8d transition energy in hydrogen again point to a discrepancy in proton charge radius [29]. Similar problems remain in two-photon spectroscopy when measuring the 1s − 3s interval [30,31].…”

Section: Introductionmentioning

confidence: 99%

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Line Profile Asymmetry in Precision Spectroscopy

Anikin¹,

Zalialiutdinov²,

Solovyev³

et al. 2022

Preprint

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“…The measurement of the 1S − 2S transition has been performed in a magnetic trap of hydrogen [28] and antihydrogen [29] and also in a beam [30]. More recently, experiments measured the 1S − 3S [31] and the 2S 1/2 − 8D 5/2 [32] transitions of hydrogen with unprecedented precision. Furthermore, magnetic slowing of paramagnetic hydrogen has been proposed [33].…”

Section: Introductionmentioning

confidence: 99%

Direct laser cooling of calcium monohydride molecules

Vázquez-Carson,

Sun,

Dai

et al. 2022

Preprint

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We demonstrate optical cycling and sub-Doppler laser cooling of a cryogenic buffer-gas beam of calcium monohydride (CaH) molecules. We measure vibrational branching ratios for laser cooling transitions for both excited electronic states A and B. We measure further that repeated photon scattering via the A ← X transition is achievable at a rate of ∼ 1.6 × 10 6 photons/s and demonstrate the interaction-time limited scattering of ∼ 200 photons by repumping the largest vibrational decay channel. We also demonstrate the ability to sub-Doppler cool a molecular beam of CaH through the magnetically assisted Sisyphus effect. Using a standing wave of light, we lower the molecular beam's transverse temperature from 12.2(1.2) mK to 5.7(1.1) mK. We compare these results to sub-Doppler forces modeled using optical Bloch equations and Monte Carlo simulations of the molecular beam trajectories. This work establishes a clear pathway for creating a magneto-optical trap (MOT) of CaH molecules. Such a MOT could serve as a starting point for production of ultracold hydrogen gas via dissociation of a trapped CaH cloud.

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Measurement of the 2S1/2−8D5/2 Transition in Hyd

Cited by 48 publications

References 39 publications

Muonium Lamb shift: theory update and experimental prospects

Muonium Lamb shift: theory update and experimental prospects

Line Profile Asymmetry in Precision Spectroscopy

Direct laser cooling of calcium monohydride molecules

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