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Towards Lamb shift spectroscopy of antihydrogen atoms at the GBAR $\overline H$ beam line
/ Tanaka, T A (Tokyo U., Komaba) ; Blumer, P (Zurich, ETH) ; Janka, G (PSI, Villigen) ; Ohayon, B (Technion) ; Regenfus, C (Zurich, ETH) ; Crivelli, P (Zurich, ETH) ; Kuroda, N (Tokyo U., Komaba) ; Tsukida, R (Tokyo U., Komaba) ; Higuchi, T (Kyoto U., KURRI) ; Tanaka, K S (Waseda U., RISE)
/GBAR Collaboration
A microwave (MW) spectroscopy experiment has been proposed to directly measure the resonant frequency of $2S_{1/2}-2P_{1/2}$ Lamb shift transition in antihydrogen ($\mathrm{\bar{H}}$) atoms. The spectroscopy opens up the possibility of deriving the charge radius of antiproton ($\mathrm{\bar{p}}$) using a beam of $\mathrm{\bar{H}}$ atoms with a kinetic energy of a few keV travelling under a magnetic field-free environment.The requisite spectroscopy apparatuses have been developed and installed in the $\mathrm{\bar{H}}$ beam line at the GBAR experiment, where the production of $\mathrm{\bar{H}}$ beam at 6.1 keV was demonstrated through a charge exchange reaction of a $\mathrm{\bar{p}}$ beam passing through a positronium (Ps) cloud.The spectroscopy setup is composed of a MW spectrometer and a Lyman-$\alpha$ photon detector.The MW spectrometer consists of two consecutive MW apparatuses which have a relatively large borehole of 30 mm diameter, and each MW apparatus comprises a pair of parallel plate electrodes as its inner conductor and a rectangular box as its outer conductor.Downstream to the MW spectrometer, the Lyman-$\alpha$ detector has been installed to count the $\mathrm{\bar{H}}$ atoms remaining in the $2S$ state after interacting with the MW E-field.Towards the $\mathrm{\bar{H}}$ Lamb shift spectroscopy, we present here a characterization of the MW spectrometer, an evaluation of the detection efficiency of the Lyman-$\alpha$ detector, and a precision expected in the first line shape measurement of the $\mathrm{\bar{H}}$ Lamb shift..
2025 - 8 p.
- Published in : PoS EXA-LEAP2024 (2025) 044
Fulltext: PDF;
In : International Conference on Exotic Atoms and Related Topics and Conference on Low Energy Antiprotons (EXA/LEAP 2024), Vienna, Austria, 26 - 30 Aug 2024, pp.044
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Towards Precision Spectroscopy of Antiprotonic Atoms for Probing Strong-field QED
/ Baptista, Gonçalo (Paris, Lab. Kastler Brossel) ; Rathi, Shikha (Paris, Lab. Kastler Brossel ; Technion) ; Roosa, Michael (Paris, Lab. Kastler Brossel) ; Senetaire, Quentin (Paris, Lab. Kastler Brossel) ; Sommerfeldt, Jonas (Paris, Lab. Kastler Brossel) ; Azuma, Toshiyuki (Wako, RIKEN) ; Becker, Daniel (NIST, Boulder) ; Butin, Francois (CERN) ; Eizenberg, Ofir (Technion) ; Fowler, Joseph (NIST, Boulder) et al.
PAX (antiProtonic Atom X-ray spectroscopy) is a new experiment with the aim to test strong-field quantum electrodynamics (QED) effects by performing high-precision x-ray spectroscopy of antiprotonic atoms. By utilizing advanced microcalorimeter detection techniques and a low-energy antiproton beam provided by the ELENA ring at CERN, gaseous targets will be used for the creation of antiprotonic atoms, and the measurement of transitions between circular Rydberg states will be conducted with up to two orders of magnitude improved accuracy over previous studies using high-purity germanium detectors. [...]
arXiv:2501.08893.-
2025-04-14 - 12 p.
- Published in : PoS EXA-LEAP2024 (2025) 085
Fulltext: 2501.08893 - PDF; document - PDF;
In : International Conference on Exotic Atoms and Related Topics and Conference on Low Energy Antiprotons (EXA/LEAP 2024), Vienna, Austria, 26 - 30 Aug 2024, pp.085
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A 16 Parts per Trillion Comparison of the Antiproton-to-Proton q/m Ratios
/ Borchert, M.J. (RIKEN (main) ; Leibniz U., Hannover ; Braunschweig, Phys. Tech. Bund.) ; Devlin, J.A. (RIKEN (main) ; CERN) ; Erlewein, S.E. (RIKEN (main) ; CERN ; Heidelberg, Max Planck Inst.) ; Fleck, M. (RIKEN (main) ; Tokyo U., Komaba) ; Harrington, J.A. (RIKEN (main) ; Heidelberg, Max Planck Inst.) ; Higuchi, T. (RIKEN (main) ; Tokyo U., Komaba) ; Latacz, B. (RIKEN (main)) ; Voelksen, F. (RIKEN (main) ; Darmstadt, GSI) ; Wursten, E. (RIKEN (main) ; CERN ; Heidelberg, Max Planck Inst.) ; Abbass, F. (Mainz U., Inst. Phys.) et al.
The Standard Model (SM) of particle physics is both incredibly successful and glaringly incomplete. [...]
arXiv:2311.16006.
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Particle Identification in Belle II Silicon Vertex Detector
/ Hazra, S (Tata Inst.) ; Kaliyar, A B (Tata Inst.) ; Mohanty, G B (Tata Inst.) ; Adamczyk, K (Cracow, INP) ; Aihara, H (Tokyo U.) ; Aziz, T (Tata Inst.) ; Bacher, S (Cracow, INP) ; Bahinipati, S (Indian Inst. Tech., Bhubaneswar) ; Batignani, G (Pisa U. ; INFN, Pisa) ; Baudot, J (Strasbourg, IPHC) et al.
We report a particle identification (PID) tool developed using energy-loss information in the silicon-strip vertex detector (SVD) of Belle II for charged pions, kaons, and protons using \(D^{* + } \to D^{0}[ \to K^{ - }\pi ^{ + }]\pi ^{ + }\) and \(\Lambda \to p\pi ^{ - }\) decay samples. The study is based on e^+e^− collision data recorded at the \(\Upsilon (4S)\) resonance by Belle II and the results are compared with that of a Monte Carlo sample. [...]
2021 - 7 p.
- Published in : JPS Conf. Proc. 34 (2021) 010018
Fulltext: PDF;
In : 29th International Workshop on Vertex Detectors, Virtual, Japan, 5 - 8 Oct 2020, pp.010018
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