New limits on the electric dipole moment of positive and negative muons

Bailey, J. M.; Borer, K.; Combley, F.; Drumm, H.; Farley, F. J. M.; Field, J. H.; Flegel, W.; Hattersley, P. M.; Krienen, F.; Lange, Friedrich; Picasso, E.; Rüden, W. von

doi:10.1088/0305-4616/4/3/010

Cited by 94 publications

(99 citation statements)

References 30 publications

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“…First of all, it is well known (see, e.g. [17]) and has been reemphasized [9,18] that the muon (g − 2) experiment by itself cannot exclude a contribution of d µ to the observed precession frequency. Amazingly, if the (g − 2) experiment observes a beyond-SM effect due to new physics, parameterized as a µ = a −19 e cm seems very unlikely, there is no solid theoretical argument against it either, and only an improvement of the experimental limit can settle the issue.…”

Section: Motivationmentioning

confidence: 99%

Compact storage ring to search for the muon electric dipole moment

Adelmann

Kirch

Onderwater

et al. 2010

J. Phys. G: Nucl. Part. Phys.

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We present the concept of a compact storage ring of less than 0.5 m orbit radius to search for the electric dipole moment of the muon (d µ ) by adapting the "frozen spin" method. At existing muon facilities a statistics limited sensitivity of d µ ∼ 5 × 10 −23 e cm can be achieved within one year of data taking. Reaching this precision would demonstrate the viability of this novel technique to directly search for charged particle EDMs and already test a number of Standard Model extensions. At a future, high-power muon facility a statistical reach of d µ ∼ 5 × 10 −25 e cm seems realistic with this setup.Key words: Electric and magnetic moments, Muons, Storage rings PACS: 13.40. Em, 14.60.Ef, 29.20.Dh MotivationThe observed matter-antimatter asymmetry of the Universe is not accounted for by the known extent of CP violation present in the Standard Model (SM) of particle physics. The search for permanent electric dipole moments (EDM) of fundamental particles is regarded as one of the most promising avenues for finding manifestations of additional CP violation, see, e.g., [1]. As these EDMs violate time reversal invariance (T) and parity (P), they also violate CP, if CPT invariance is assumed. Various systems have been under investigation for a long time with limits becoming more and more restrictive, often challenging models beyond the SM. Of particular interest are the searches for the EDM of the neutron [2], the electron [3] and the 199 Hg atom [4].

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Section: Motivationmentioning

confidence: 99%

Compact storage ring to search for the muon electric dipole moment

Adelmann

Kirch

Onderwater

et al. 2010

J. Phys. G: Nucl. Part. Phys.

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“…/~ B are orthogonal, leading to a small tilt in the precession plane and an second order increase in the precession frequency. Although this was used to set a limit on the muon EDM [181,1053], it does not allow for a sensitive search.…”

Section: Experimental Approachmentioning

confidence: 99%

“…The CERN experiment obtained 1: 1 10 18 ecm (95% C.L.) [1053] and the preliminary limit from Brookhaven is 2: 8 10 19 ecm [181]. Assuming lepton universality, the electron EDM limit of d e < 2: 2 10 27 ecm [179] can be scaled by the electron to muon mass ratio, in order to obtain an indirect limit of d < 5 10 25 ecm.…”

Section: Muon Edmmentioning

confidence: 99%

Flavor physics of leptons and dipole moments

Raidal¹,

Schaaf²,

Bigi³

et al. 2009

Flavor in the Era of the LHC

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This chapter of the report of the "Flavour in the era of the LHC" Workshop discusses the theoretical, phenomenological and experimental issues related to flavour phenomena in the charged lepton sector and in flavour-conserving CP-violating processes. We review the current experimental limits and the main theoretical models for the flavour structure of fundamental particles. We analyze the phenomenological consequences of the available data, setting constraints on explicit models beyond the Standard Model, presenting benchmarks for the discovery potential of forthcoming measurements both at the LHC and at low energy, and exploring options for possible future experiments.

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“…[8,9]. The sensitivity of this method is limited, because the vertical polarization component can only grow for a time of the order of the precession period.…”

Section: The 'Parasitic' Waymentioning

confidence: 99%

Light ion EDM search in magnetic storage rings

Onderwater

2006

Hyperfine Interact

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Permanent electric dipole moments (EDMs) violate parity and timereversal symmetry. Within the Standard Model (SM), they require CP violation and are many orders of magnitude below present experimental sensitivity. Many extensions of the SM predict much larger EDMs, which are therefore an excellent probe for the existence of 'new physics.' So far only electrically neutral systems were used for sensitive searches of EDMs. Several techniques, based on storing fast particles in a magnetic storage ring, are being developed to probe charged particles for an EDM. With the introduction of these novel experimental methods, high sensitivity for charged systems, in particular light nuclei, is within reach.

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New limits on the electric dipole moment of positive and negative muons

Cited by 94 publications

References 30 publications

Compact storage ring to search for the muon electric dipole moment

Compact storage ring to search for the muon electric dipole moment

Flavor physics of leptons and dipole moments

Light ion EDM search in magnetic storage rings

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