A compact frozen-spin trap for the search for the electric dipole moment of the muon

A. Adelmann; A. R. Bainbridge; I. Bailey; A. Baldini; S. Basnet; N. Berger; L. Bianco; C. Calzolaio; L. Caminada; G. Cavoto; F. Cei; R. Chakraborty; C. Barajas Chavez; M. Chiappini; R. Chislett; A. Crivellin; C. Dutsov; A. Ebrahimi; M. Francesconi; L. Galli; G. Gallucci; M. Giovannozzi; H. Goyal; M. Grassi; A. Gurgone; G. Hesketh; M. Hildebrandt; M. Hoferichter; S. Y. Hoh; D. Höhl; T. Hu; T. Hume; J. A. Jaeger; P. Juknevicius; H. C. Kästli; A. Keshavarzi; K. S. Khaw; K. Kirch; A. Kozlinskiy; M. Lancaster; F. Leonetti; B. Märkisch; L. Morvaj; A. Papa; M. Paraliev; D. Pasciuto; J. Price; F. Renga; M. Sakurai; D. Sanz-Becerra; P. Schmidt-Wellenburg; Y. Z. Shang; Y. Takeuchi; M. E. Tegano; T. Teubner; F. Trillaud; D. Uglietti; D. Vasilkova; A. Venturini; B. Vitali; C. Voena; J. Vossebeld; F. Wauters; G. M. Wong; Y. Zeng

doi:10.1140/epjc/s10052-025-14295-7

A compact frozen-spin trap for the search for the electric dipole moment of the muon

A. Adelmann
, A. R. Bainbridge
, I. Bailey
, A. Baldini
, S. Basnet
, N. Berger
, L. Bianco
, C. Calzolaio
, L. Caminada
, G. Cavoto
, F. Cei
, R. Chakraborty
, C. Barajas Chavez
, M. Chiappini
, R. Chislett
, A. Crivellin
, C. Dutsov
, A. Ebrahimi
, M. Francesconi
, L. Galli

G. Gallucci, M. Giovannozzi, H. Goyal, M. Grassi, A. Gurgone, G. Hesketh, M. Hildebrandt, M. Hoferichter, S. Y. Hoh, D. Höhl, T. Hu, T. Hume, J. A. Jaeger, P. Juknevicius, H. C. Kästli, A. Keshavarzi, K. S. Khaw, K. Kirch, A. Kozlinskiy, M. Lancaster, F. Leonetti, B. Märkisch, L. Morvaj, A. Papa, M. Paraliev, D. Pasciuto, J. Price, F. Renga, M. Sakurai, D. Sanz-Becerra, P. Schmidt-Wellenburg, Y. Z. Shang, Y. Takeuchi, M. E. Tegano, T. Teubner, F. Trillaud, D. Uglietti, D. Vasilkova, A. Venturini, B. Vitali, C. Voena, J. Vossebeld, F. Wauters, G. M. Wong, Y. Zeng

Associate Professorship of Fundamental Particle Physics at Low Energies

ETH Zurich
Paul Scherrer Institut
Cockcroft Institute (CI Daresbury)
Lancaster University
SNS and INFN
Shanghai Jiao Tong University
Johannes Gutenberg University
Physics Department Pisa
Physik-Institut der Universität Zürich
Universita La Sapienza
Sezione INFN di Roma La Sapienza
University of Liverpool
University College London
European Organization for Nuclear Research
University of Bern
Universidad Nacional Autónoma de México
University of Manchester
EPFL

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

Abstract

Electric dipole moments (EDM) of fundamental particles inherently violate time-reversal (T) and the combined charge-conjugation and parity symmetry (CP). We aim to measure the EDM of the muon using the frozen-spin technique within a compact storage trap. This method exploits the high effective electric field, E≈165MV/m, experienced in the rest frame of the muon with a momentum of about 23MeV/c when it passes through a solenoidal magnetic field of |B→|=2.5T. In this paper, we outline the fundamental considerations for a muon EDM search and present a conceptual design for a demonstration experiment to be conducted at secondary muon beamlines of the Paul Scherrer Institute in Switzerland. In Phase I, with an anticipated data acquisition period of 200 days, the expected sensitivity to a muon EDM is σ(d)≤4E-21e·cm. In a subsequent phase, Phase II, we propose to improve the sensitivity to σ(d)≤6E-23e·cm using a dedicated instrument installed on a different beamline that produces muons of momentum 125 MeV/c.

Original language	English
Article number	622
Journal	European Physical Journal C
Volume	85
Issue number	6
DOIs	https://doi.org/10.1140/epjc/s10052-025-14295-7
State	Published - Jun 2025

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10.1140/epjc/s10052-025-14295-7

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Adelmann, A., Bainbridge, A. R., Bailey, I., Baldini, A., Basnet, S., Berger, N., Bianco, L., Calzolaio, C., Caminada, L., Cavoto, G., Cei, F., Chakraborty, R., Barajas Chavez, C., Chiappini, M., Chislett, R., Crivellin, A., Dutsov, C., Ebrahimi, A., Francesconi, M., ... Zeng, Y. (2025). A compact frozen-spin trap for the search for the electric dipole moment of the muon. European Physical Journal C, 85(6), Article 622. https://doi.org/10.1140/epjc/s10052-025-14295-7

@article{804387c3c385417aa32f82719d885c54,

title = "A compact frozen-spin trap for the search for the electric dipole moment of the muon",

abstract = "Electric dipole moments (EDM) of fundamental particles inherently violate time-reversal (T) and the combined charge-conjugation and parity symmetry (CP). We aim to measure the EDM of the muon using the frozen-spin technique within a compact storage trap. This method exploits the high effective electric field, E≈165MV/m, experienced in the rest frame of the muon with a momentum of about 23MeV/c when it passes through a solenoidal magnetic field of |B→|=2.5T. In this paper, we outline the fundamental considerations for a muon EDM search and present a conceptual design for a demonstration experiment to be conducted at secondary muon beamlines of the Paul Scherrer Institute in Switzerland. In Phase I, with an anticipated data acquisition period of 200 days, the expected sensitivity to a muon EDM is σ(d)≤4E-21e·cm. In a subsequent phase, Phase II, we propose to improve the sensitivity to σ(d)≤6E-23e·cm using a dedicated instrument installed on a different beamline that produces muons of momentum 125 MeV/c.",

author = "A. Adelmann and Bainbridge, \{A. R.\} and I. Bailey and A. Baldini and S. Basnet and N. Berger and L. Bianco and C. Calzolaio and L. Caminada and G. Cavoto and F. Cei and R. Chakraborty and \{Barajas Chavez\}, C. and M. Chiappini and R. Chislett and A. Crivellin and C. Dutsov and A. Ebrahimi and M. Francesconi and L. Galli and G. Gallucci and M. Giovannozzi and H. Goyal and M. Grassi and A. Gurgone and G. Hesketh and M. Hildebrandt and M. Hoferichter and Hoh, \{S. Y.\} and D. H{\"o}hl and T. Hu and T. Hume and Jaeger, \{J. A.\} and P. Juknevicius and K{\"a}stli, \{H. C.\} and A. Keshavarzi and Khaw, \{K. S.\} and K. Kirch and A. Kozlinskiy and M. Lancaster and F. Leonetti and B. M{\"a}rkisch and L. Morvaj and A. Papa and M. Paraliev and D. Pasciuto and J. Price and F. Renga and M. Sakurai and D. Sanz-Becerra and P. Schmidt-Wellenburg and Shang, \{Y. Z.\} and Y. Takeuchi and Tegano, \{M. E.\} and T. Teubner and F. Trillaud and D. Uglietti and D. Vasilkova and A. Venturini and B. Vitali and C. Voena and J. Vossebeld and F. Wauters and Wong, \{G. M.\} and Y. Zeng",

note = "Publisher Copyright: {\textcopyright} The Author(s) 2025.",

year = "2025",

month = jun,

doi = "10.1140/epjc/s10052-025-14295-7",

language = "English",

volume = "85",

journal = "European Physical Journal C",

issn = "1434-6044",

publisher = "Springer Nature",

number = "6",

}

Adelmann, A, Bainbridge, AR, Bailey, I, Baldini, A, Basnet, S, Berger, N, Bianco, L, Calzolaio, C, Caminada, L, Cavoto, G, Cei, F, Chakraborty, R, Barajas Chavez, C, Chiappini, M, Chislett, R, Crivellin, A, Dutsov, C, Ebrahimi, A, Francesconi, M, Galli, L, Gallucci, G, Giovannozzi, M, Goyal, H, Grassi, M, Gurgone, A, Hesketh, G, Hildebrandt, M, Hoferichter, M, Hoh, SY, Höhl, D, Hu, T, Hume, T, Jaeger, JA, Juknevicius, P, Kästli, HC, Keshavarzi, A, Khaw, KS, Kirch, K, Kozlinskiy, A, Lancaster, M, Leonetti, F, Märkisch, B, Morvaj, L, Papa, A, Paraliev, M, Pasciuto, D, Price, J, Renga, F, Sakurai, M, Sanz-Becerra, D, Schmidt-Wellenburg, P, Shang, YZ, Takeuchi, Y, Tegano, ME, Teubner, T, Trillaud, F, Uglietti, D, Vasilkova, D, Venturini, A, Vitali, B, Voena, C, Vossebeld, J, Wauters, F, Wong, GM & Zeng, Y 2025, 'A compact frozen-spin trap for the search for the electric dipole moment of the muon', European Physical Journal C, vol. 85, no. 6, 622. https://doi.org/10.1140/epjc/s10052-025-14295-7

TY - JOUR

T1 - A compact frozen-spin trap for the search for the electric dipole moment of the muon

AU - Adelmann, A.

AU - Bainbridge, A. R.

AU - Bailey, I.

AU - Baldini, A.

AU - Basnet, S.

AU - Berger, N.

AU - Bianco, L.

AU - Calzolaio, C.

AU - Caminada, L.

AU - Cavoto, G.

AU - Cei, F.

AU - Chakraborty, R.

AU - Barajas Chavez, C.

AU - Chiappini, M.

AU - Chislett, R.

AU - Crivellin, A.

AU - Dutsov, C.

AU - Ebrahimi, A.

AU - Francesconi, M.

AU - Galli, L.

AU - Gallucci, G.

AU - Giovannozzi, M.

AU - Goyal, H.

AU - Grassi, M.

AU - Gurgone, A.

AU - Hesketh, G.

AU - Hildebrandt, M.

AU - Hoferichter, M.

AU - Hoh, S. Y.

AU - Höhl, D.

AU - Hu, T.

AU - Hume, T.

AU - Jaeger, J. A.

AU - Juknevicius, P.

AU - Kästli, H. C.

AU - Keshavarzi, A.

AU - Khaw, K. S.

AU - Kirch, K.

AU - Kozlinskiy, A.

AU - Lancaster, M.

AU - Leonetti, F.

AU - Märkisch, B.

AU - Morvaj, L.

AU - Papa, A.

AU - Paraliev, M.

AU - Pasciuto, D.

AU - Price, J.

AU - Renga, F.

AU - Sakurai, M.

AU - Sanz-Becerra, D.

AU - Schmidt-Wellenburg, P.

AU - Shang, Y. Z.

AU - Takeuchi, Y.

AU - Tegano, M. E.

AU - Teubner, T.

AU - Trillaud, F.

AU - Uglietti, D.

AU - Vasilkova, D.

AU - Venturini, A.

AU - Vitali, B.

AU - Voena, C.

AU - Vossebeld, J.

AU - Wauters, F.

AU - Wong, G. M.

AU - Zeng, Y.

PY - 2025/6

Y1 - 2025/6

N2 - Electric dipole moments (EDM) of fundamental particles inherently violate time-reversal (T) and the combined charge-conjugation and parity symmetry (CP). We aim to measure the EDM of the muon using the frozen-spin technique within a compact storage trap. This method exploits the high effective electric field, E≈165MV/m, experienced in the rest frame of the muon with a momentum of about 23MeV/c when it passes through a solenoidal magnetic field of |B→|=2.5T. In this paper, we outline the fundamental considerations for a muon EDM search and present a conceptual design for a demonstration experiment to be conducted at secondary muon beamlines of the Paul Scherrer Institute in Switzerland. In Phase I, with an anticipated data acquisition period of 200 days, the expected sensitivity to a muon EDM is σ(d)≤4E-21e·cm. In a subsequent phase, Phase II, we propose to improve the sensitivity to σ(d)≤6E-23e·cm using a dedicated instrument installed on a different beamline that produces muons of momentum 125 MeV/c.

AB - Electric dipole moments (EDM) of fundamental particles inherently violate time-reversal (T) and the combined charge-conjugation and parity symmetry (CP). We aim to measure the EDM of the muon using the frozen-spin technique within a compact storage trap. This method exploits the high effective electric field, E≈165MV/m, experienced in the rest frame of the muon with a momentum of about 23MeV/c when it passes through a solenoidal magnetic field of |B→|=2.5T. In this paper, we outline the fundamental considerations for a muon EDM search and present a conceptual design for a demonstration experiment to be conducted at secondary muon beamlines of the Paul Scherrer Institute in Switzerland. In Phase I, with an anticipated data acquisition period of 200 days, the expected sensitivity to a muon EDM is σ(d)≤4E-21e·cm. In a subsequent phase, Phase II, we propose to improve the sensitivity to σ(d)≤6E-23e·cm using a dedicated instrument installed on a different beamline that produces muons of momentum 125 MeV/c.

UR - https://www.scopus.com/pages/publications/105007720567

U2 - 10.1140/epjc/s10052-025-14295-7

DO - 10.1140/epjc/s10052-025-14295-7

M3 - Article

AN - SCOPUS:105007720567

SN - 1434-6044

VL - 85

JO - European Physical Journal C

JF - European Physical Journal C

IS - 6

M1 - 622

ER -

A compact frozen-spin trap for the search for the electric dipole moment of the muon

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