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Status of the search for a muon EDM using the frozen-spin technique
/ muEDM Collaboration
Despite the many successes of the Standard Model of particle physics, there are stillseveral physical observations that it cannot explain, such as the matter-antimatter asymmetry,non-zero neutrino masses, and the microscopic nature of dark matter. To address these limitations,extensions to the standard model are necessary, and searches for electric dipole moments (EDMs) ofleptons are valuable test. [...]
2023 - 6 p.
- Published in : JINST
Fulltext: PDF;
In : New Frontiers in Lepton Flavor 2023 (NeFLe 2023), Pisa, Italy, 15 - 17 May 2023, pp.C09003
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Systematic effects in the search for a muon electric dipole moment using the frozen-spin technique
/ Dutsov, Chavdar (PSI, Villigen) ; Giovanozzi, Massimo (CERN) ; Hume, Timothy (PSI, Villigen ; Zurich, ETH) ; Schmidt-Wellenburg, Philipp (PSI, Villigen)
/muonEDM Collaboration
At the Paul Scherrer Institute we are developing a high precision instrument to measurethe electric dipole moment (EDM) of the muon. The salient feature of the experiment is the use ofthe frozen-spin technique to suppress the anomalous precession of the muon spin, allowing for asensitivity that cannot be achieved with conventional g-2 muon storage rings. [...]
2023 - 6 p.
- Published in : JINST 18 (2023) C09008
Fulltext: PDF;
In : New Frontiers in Lepton Flavor 2023 (NeFLe 2023), Pisa, Italy, 15 - 17 May 2023, pp.C09008
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A compact frozen-spin trap for the search for the electric dipole moment of the muon
/ Adelmann, A. (Zurich, ETH ; PSI, Villigen) ; Bainbridge, A.R. (Daresbury ; Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U.) ; Bailey, I. (Cockcroft Inst. Accel. Sci. Tech. ; Liverpool U. ; Lancaster U. (main)) ; Baldini, A. (INFN, Pisa ; Pisa U.) ; Basnet, S. (Shanghai Jiao Tong U. ; Shanghai Jiaotong U.) ; Berger, N. (U. Mainz, PRISMA) ; Bianco, L. (INFN, Pisa) ; Calzolaio, C. (PSI, Villigen) ; Caminada, L. (Zurich U. ; PSI, Villigen) ; Cavoto, G. (Rome U. ; INFN, Rome) et al.
The electric dipole moments~(EDM) of fundamental particles inherently violate parity~(P) and time-reversal~(T) symmetries. By virtue of the CPT theorem in quantum field theory, the latter also implies the violation of the combined charge-conjugation and parity~(CP) symmetry. [...]
arXiv:2501.18979.-
2025-06-06 - 34 p.
- Published in : Eur. Phys. J. C 85 (2025) 622
Fulltext: 2501.18979 - PDF; document - PDF;
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Implementation of the frozen-spin technique for the search for a muon electric dipole moment
/ Hume, Timothy (PSI, Villigen ; Zurich, ETH) ; Chakraborty, Ritwika (PSI, Villigen) ; Doinaki, Anastasia (PSI, Villigen ; Zurich, ETH) ; Dutsov, Chavdar (PSI, Villigen) ; Giovannozzi, Massimo (CERN) ; Michielsen, Katia (PSI, Villigen ; Zurich, ETH) ; Morvaj, Ljiljana (PSI, Villigen) ; Papa, Angela (PSI, Villigen ; INFN, Pisa) ; Schmidt-Wellenburg, Philipp (PSI, Villigen) ; Stäger, David (PSI, Villigen ; Zurich, ETH)
/muEDM Collaboration
Applying the frozen-spin technique in a compact3 T solenoid will enable a search for the muon electricdipole moment (EDM) with unprecedented sensitivity, improving uponthe current direct limit by approximately a factor of 1000. Afterinjection of a selected muon, a pulsed magnetic field will reduceits longitudinal momentum sufficiently to be confined within astatic weakly-focusing magnetic field and maintain a closed circularorbit. [...]
2024 - 5 p.
- Published in : JINST 19 (2024) P01021
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Preparations for a search of the muon EDM at PSI
/ Schmidt-Wellenburg, P (PSI, Villigen) ; Calzolaio, C (PSI, Villigen) ; Doinaki, A (PSI, Villigen) ; Dutsov, C (PSI, Villigen) ; Giovannozzi, M (CERN) ; Hume, T (PSI, Villigen) ; Trillaud, F (Mexico U.)
/muEDM Collaboration
Electric dipole moments (EDMs) of fundamental particles violate time invariance and the combined symmetry of charge and parity (CP). The existence of a large muon EDM (muEDM) is made plausible by tensions with Standard Model predictions for semileptonic decays of heavy meson measured at LHCb, BaBar, and Belle, as well as the muon’s anomalous magnetic moment (AMM). [...]
2023 - 5 p.
- Published in : EPJ Web Conf. 289 (2023) 01008
Fulltext: PDF;
In : Workshop on "Flavour changing and conserving processes" 2022 (FCCP 2022), Anacapri, Italy, 22 - 24 Sep 2022, pp.01008
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7.
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Anomalous spin precession systematic effects in the search for a muon EDM using the frozen-spin technique
/ Cavoto, G. (INFN, Rome) ; Chakraborty, R. (PSI, Villigen) ; Doinaki, A. (PSI, Villigen) ; Dutsov, C. (PSI, Villigen) ; Giovannozzi, M. (CERN) ; Hume, T. (PSI, Villigen ; Zurich, ETH) ; Kirch, K. (PSI, Villigen ; Zurich, ETH) ; Michielsen, K. (PSI, Villigen ; Zurich, ETH ; Ec. Polytech., Palaiseau (main)) ; Morvaj, L. (PSI, Villigen) ; Papa, A. (INFN, Pisa) et al.
At the Paul Scherrer Institut (PSI), we are currently working on the development of a high-precision apparatus with the aim of searching for the muon electric dipole moment (EDM) with unprecedented sensitivity. The underpinning principle of this experiment is the frozen-spin technique, a method that suppresses the spin precession due to the anomalous magnetic moment, thereby enhancing the signal-to-noise ratio for EDM signals. [...]
arXiv:2311.10508.-
2024-03-12 - 27 p.
- Published in : Eur. Phys. J. C 84 (2024) 262
Fulltext: 2311.10508 - PDF; document - PDF;
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Occupancy studies for the LHCb Run4 Mighty Tracker
/ Bellee, Violaine (University of Zurich (CH)) ; Hume, Tim (University of Zurich (CH)) ; Steinkamp, Olaf (University of Zurich (CH))
Occupancy studies are reported for the downstream tracking stations in which the effects of secondary particle production in detector materials are considered. A simplified model of the material description for the Inner Tracker (IT) silicon pixel detector proposed for LHCb LS3 enhancements has been developed in Geant4 to facilitate this study. [...]
LHCb-PUB-2022-003; CERN-LHCb-PUB-2022-003.-
Geneva : CERN, 2022 - 47.
Fulltext: PDF;
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