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Description
Electric dipole moments (EDMs) of elementary particles violate time-
reversal symmetry. According to the CPT theorem, this also implies the violation of
combined charge-conjugation and parity-inversion (CP) symmetry, making EDMs powerful
tools for probing physics beyond the current Standard Model (SM) of particle physics. The
muEDM experiment aims at setting the ground for a new direct electric dipole moment
(EDM) search using muons. The experiment will perform this dedicated search using the
frozen-spin technique for the first time worldwide, aiming at improving the current
sensitivity by more than three orders of magnitude to better than 6 10−23 e cm, an
astonishing jump. This search is a unique opportunity to probe previously uncharted
territory and to test theories Behind Standard Model physics.
The experiment will be performed in two phases.
Phase I:
In this exploratory phase, we will set up an experiment to demonstrate the frozen-spin
method and search for a muon EDM using an existing solenoid. The instrument will be
connected to a surface-muon beamline at PSI, delivering about 4 106s−1 muons at a
momentum of p=28 MeV/c in a transverse phase space of εxx′ = 192 πmm mrad and εyy′ =
171 πmm mrad. Although the sensitivity to a muon EDM will be sufficient to improve the
current best measurement, the main purpose is to establish all necessary techniques and
methods for a measurement with the highest possible sensitivity.
Phase II:
The future instrument will use a dedicated magnet with minimal field gradient between
injection and storage region to increase the acceptance phase space and integrate all
lessons learned from Phase I. In addition, it will benefit from being coupled to the highest-
intensity muon beam at PSI, with more than 1 108s−1 muons at a momentum of p=125
MeV/c in a transverse phase space of εxx′ = 920 πmm mrad and εyy′ = 213 πmm mrad.
In this seminar we will review the motivation to search for EDMs and the current status of
the muEDM experiment at PSI.
reversal symmetry. According to the CPT theorem, this also implies the violation of
combined charge-conjugation and parity-inversion (CP) symmetry, making EDMs powerful
tools for probing physics beyond the current Standard Model (SM) of particle physics. The
muEDM experiment aims at setting the ground for a new direct electric dipole moment
(EDM) search using muons. The experiment will perform this dedicated search using the
frozen-spin technique for the first time worldwide, aiming at improving the current
sensitivity by more than three orders of magnitude to better than 6 10−23 e cm, an
astonishing jump. This search is a unique opportunity to probe previously uncharted
territory and to test theories Behind Standard Model physics.
The experiment will be performed in two phases.
Phase I:
In this exploratory phase, we will set up an experiment to demonstrate the frozen-spin
method and search for a muon EDM using an existing solenoid. The instrument will be
connected to a surface-muon beamline at PSI, delivering about 4 106s−1 muons at a
momentum of p=28 MeV/c in a transverse phase space of εxx′ = 192 πmm mrad and εyy′ =
171 πmm mrad. Although the sensitivity to a muon EDM will be sufficient to improve the
current best measurement, the main purpose is to establish all necessary techniques and
methods for a measurement with the highest possible sensitivity.
Phase II:
The future instrument will use a dedicated magnet with minimal field gradient between
injection and storage region to increase the acceptance phase space and integrate all
lessons learned from Phase I. In addition, it will benefit from being coupled to the highest-
intensity muon beam at PSI, with more than 1 108s−1 muons at a momentum of p=125
MeV/c in a transverse phase space of εxx′ = 920 πmm mrad and εyy′ = 213 πmm mrad.
In this seminar we will review the motivation to search for EDMs and the current status of
the muEDM experiment at PSI.
