Search for a muon EDM using the frozen-spin technique

Adelmann, A.; Backhaus, M.; Barajas, C. Chavez; Berger, N.; Bowcock, T.; Calzolaio, C.; Cavoto, G.; Chislett, R.; Crivellin, A.; Daum, M.; Fertl, M.; Giovannozzi, M.; Hesketh, G.; Hildebrandt, M.; Keshelashvili, I.; Keshavarzi, A.; Khaw, K. S.; Kirch, K.; Kozlinskiy, A.; Knecht, A.; Lancaster, M.; Märkisch, B.; Aeschbacher, F. Meier; Méot, F.; Nass, A.; Papa, A.; Pretz, J.; Price, J.; Rathmann, F.; Renga, F.; Sakurai, M.; Schmidt-Wellenburg, P.; Schöning, A.; Schott, M.; Voena, C.; Vossebeld, J.; Wauters, F.; Winter, P.

doi:10.48550/arxiv.2102.08838

Cited by 26 publications

(29 citation statements)

References 67 publications

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“…from the limit on the electron EDM [293]. A large part of the parameter space in which the phase is O(1), as well possible from an EFT perspective [189,294,295], could be covered by a proposed dedicated muon EDM experiment at PSI [296]. In fact, the corresponding non-MFV flavour structure is not at odds with naturalness arguments, since, in the limit of vanishing neutrino masses, lepton flavour is conserved, and thus it is possible to completely disentangle the muon from the electron EDM via a symmetry, meaning that no fine tuning is necessary.…”

Section: Anomalous Magnetic Moments Of Charged Leptonsmentioning

confidence: 99%

Unveiling Hidden Physics at the LHC

Fischer¹,

Garcia²,

Antusch³

et al. 2021

Preprint

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The field of particle physics is at the crossroads. The discovery of a Higgs-like boson completed the Standard Model (SM), but the lacking observation of convincing resonances Beyond the SM (BSM) offers no guidance for the future of particle physics. On the other hand, the motivation for New Physics has not diminished and is, in fact, reinforced by several striking anomalous results in many experiments. Here we summarise the status of the most significant anomalies, including the most recent results for the flavour anomalies, the multi-lepton anomalies at the LHC, the Higgs-like excess at around 96 GeV, and anomalies in neutrino physics, astrophysics, cosmology, and cosmic rays.While the LHC promises up to 4 ab −1 of integrated luminosity and far-reaching physics programmes to unveil BSM physics, we consider the possibility that the latter could be tested with present data, but that systemic shortcomings of the experiments and their search strategies may preclude their discovery for several reasons, including: final states consisting in soft particles only, associated production processes, QCD-like final states, close-by SM resonances, and SUSY scenarios where no missing energy is produced.New search strategies could help to unveil the hidden BSM signatures, devised by making use of the CERN open data as a new testing ground. We discuss the CERN open data with its policies, challenges, and potential usefulness for the community. We showcase the example of the CMS collaboration, which is the only collaboration regularly releasing some of its data. We find it important to stress that individuals using public data for their own research does not imply competition with experimental efforts, but rather provides unique opportunities to give guidance for further BSM searches by the collaborations.Wide access to open data is paramount to fully exploit the LHCs potential.

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Section: Anomalous Magnetic Moments Of Charged Leptonsmentioning

confidence: 99%

Unveiling Hidden Physics at the LHC

Fischer¹,

Garcia²,

Antusch³

et al. 2021

Preprint

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“…The Paul Scherrer Institut (PSI) muEDM experiment is projected to have a sensitivity within the ballpark of 5 × 10 −23 e cm [64,65]. Similarly, the FNAL Muon g−2 experiment aims to probe muon EDMs of order 10 −21 e cm [66].…”

Section: Interplay Of Corrections To the Muon Mass And Muon Dipole Mo...mentioning

confidence: 99%

Reflecting on chirality: CP-violating extensions of the single scalar-leptoquark solutions for the $(g-2)_{e,μ}$ puzzles and their implications for lepton EDMs

Bigaran,

Volkas

2021

Preprint

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We study the two scalar leptoquarks capable of generating chirally-enhanced, sign-dependent contributions to lepton magnetic dipole moments (MDMs) and electric dipole moments (EDMs), R2 ∼ (3, 2, 7/6) and S1 ∼ (3, 1, −1/3). We consider the case in which the electron and muon sectors are decoupled, and leptoquark couplings are assigned complex values. Adopting the coupling ansatz that the electron dipole operator is generated by charm-containing loops, and muon dipole operator by top-containing loops, we find that both minimal leptoquark models remain viable solutions for reconciling anomalies in the muon and electron MDMs, accounting for either of the two current (disparate) electron MDM results from Cs and Rb interferometry experiments. We also examine the correlated corrections to the muon and electron masses generated by these models, and argue that to minimise fine-tuning this introduces an upper bound on viable leptoquark (φ) masses, m φ < O(4) TeV. Similar arguments allow us to make a prediction for the upper bound of the muon EDM generated by these models, |dµ| < O(10 −22 ) e cm, which could be within reach of upcoming experimental programs, including Muon g−2 at Fermilab (FNAL), and muEDM at Paul Scherrer Institut (PSI).

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“…We propose a search for the permanent electric dipole moment (EDM) of the muon employing the frozen-spin technique [1] at the Paul Scherrer Institute (PSI), Switzerland, aiming for a sensitivity of 6×10 −23 e•cm [2]. A non-zero EDM of a fundamental particle violates both parity and time-reversal symmetry, and assuming CPT invariance, this implies the violation of charge-parity (CP) symmetry.…”

Section: Introductionmentioning

confidence: 99%

muEDM: Towards a search for the muon electric dipole moment at PSI using the frozen-spin technique

Sakurai¹,

Adelmann²,

Backhaus³

et al. 2022

Preprint

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The search for a permanent electric dipole moment (EDM) of the muon is an excellent probe for physics beyond the Standard Model of particle physics. We propose the first dedicated muon EDM search employing the frozen-spin technique at the Paul Scherrer Institute (PSI), Switzerland, with a sensitivity of 6 × 10 −23 e • cm, improving the current best limit set by the E821 experiment at Brookhaven National Laboratory by more than three orders of magnitude. In preparation for a high precision experiment to measure the muon EDM, several R&D studies have been performed at PSI: the characterisation of a possible beamline to host the experiment for the muon beam injection study and the measurement of the multiple Coulomb scattering of positrons in potential detector materials at low momenta for the positron tracking scheme development. This paper discusses experimental concepts and the current status of the muEDM experiment at PSI.

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Search for a muon EDM using the frozen-spin technique

Cited by 26 publications

References 67 publications

Unveiling Hidden Physics at the LHC

Unveiling Hidden Physics at the LHC

Reflecting on chirality: CP-violating extensions of the single scalar-leptoquark solutions for the $(g-2)_{e,μ}$ puzzles and their implications for lepton EDMs

muEDM: Towards a search for the muon electric dipole moment at PSI using the frozen-spin technique

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