The pulsed neutron beam EDM experiment

Chanel, E.; Hodge, Z.; Ries, D.; Schulthess, Ivo; Solar, M.; Söldner, T.; Stalder, Oliver; Thorne, Jacob; Piegsa, F. M.

doi:10.1051/epjconf/201921902004

Cited by 12 publications

(8 citation statements)

References 22 publications

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“…The blue shaded region represents a typical future prospect for the neutron EDM searches: 2 -3 × 10 −15 e fm by nEDM@SNS [148], 3 × 10 −14 e fm by nEDM search at LANL [149], O(10 −14 )e fm by TUCAN [150], O(10 −14 )e fm by PanEDM [151], O(10 −(14 -15) )e fm by PNPI-ILL-PTI [152], O(10 −(14 -15) )e fm by n2EDM [153] (see also Ref. [154] for beam EDM experiments). Thus, we can obtain information on relatively high scale SUSY, where the soft mass is of the order of 0.1 -1 PeV, depending on y D and N .…”

Section: Summary Plotsmentioning

confidence: 94%

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Baryon Asymmetric Universe from Spontaneous CP Violation

Fujikura,

Nakai,

Sato

et al. 2022

Preprint

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Spontaneous CP violation, such as the Nelson-Barr (NB) mechanism, is an attractive scenario for addressing the strong CP problem while realizing the observed phase of the Cabibbo-Kobayashi-Maskawa (CKM) quark-mixing matrix. However, not only the CKM phase but also the baryon asymmetric Universe requires sources of CP violation. In this study, we show that a supersymmetric NB mechanism can naturally accommodate the Affleck-Dine (AD) baryogenesis within a CP-invariant Lagrangian. The model provides flat directions associated with new heavy quarks. Focusing on one of the directions, we find that the correct baryon asymmetry is obtained with a sufficiently low reheating temperature which does not cause the gravitino problem. Some parameter space is consistent with the gravitino dark matter. We assess radiative corrections to the strong CP phase induced by gaugemediated supersymmetry breaking and CP-violating heavy fields and show that the strong CP problem is solved in a viable parameter space where the visible sector supersymmetric particles must be lighter than O(100) TeV. Even in the case that they are heavier than the TeV scale, our model predicts the neutron electric dipole moment within the reach of the near future experiments. Our model addresses the electroweak naturalness problem, strong CP problem, baryon asymmetric Universe, and dark matter. Then, the model may give a new compelling paradigm of physics beyond the Standard Model.

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Section: Summary Plotsmentioning

confidence: 94%

“…The red-shaded region is excluded from the current constraint on θ [147]. The blue shaded region represents the typical sensitivity of future experiments [148][149][150][151][152][153][154].…”

Section: Summary Plotsmentioning

confidence: 99%

Baryon Asymmetric Universe from Spontaneous CP Violation

Fujikura,

Nakai,

Sato

et al. 2022

Preprint

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“…The idea of beam experiments has also been revisited: the spurious effect of the motional field could be utilized to extract the EDM signal in conjunction with the pulsed structure of the cold neutron beam at a spallation source [130,152]. Modular units of vacuum chambers containing precision field plates could be assembled together to lengthen the free precession region to tens and hundreds of meters.…”

Section: Statisticalmentioning

confidence: 99%

Electric dipole moments and the search for new physics

Alarcón¹,

Alexander²,

Anastassopoulos³

et al. 2022

Preprint

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Static electric dipole moments of nondegenerate systems probe mass scales for physics beyond the Standard Model well beyond those reached directly at high energy colliders. Discrimination between different physics models, however, requires complementary searches in atomic-molecular-and-optical, nuclear and particle physics. In this report, we discuss the current status and prospects in the near future for a compelling suite of such experiments, along with developments needed in the encompassing theoretical framework.

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“…[ 32 ] Name Lab Technique Ref. nEDM@SNS Oak ridge - Spallation source UCN - superfluid helium - He comagnetometer [ 43 ] n2EDM PSI - Spallation source UCN - double chamber - Hg comagnetometer [ 41 ] nEDM@LANL LANL - Spallation Source UCN - double chamber - Hg comagnetometer [ 39 ] TUCAN TRIUMF - Spallation Source UCN - double chamber - Hg - Xe comagnetometer [ 40 ] panEDM ILL - Reactor UCN - double chamber [ 44 ] PNPI nEDM ILL - PNPI UCN - double chamber [ 38 ] beam nEDM ESS spallation source Pulsed cold neutron beam [ 42 ] …”

Section: Electric Dipole Momentmentioning

confidence: 99%

Flavor-diagonal CP violation: the electric dipole moment

Shindler

2021

Eur. Phys. J. A

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The observed baryon asymmetry in the universe cannot be reconciled with the current form of the Standard Model (SM) of particle physics. The Standard Model breaks charge conjugation parity (CP) symmetry, but not in a sufficient amount to explain the observed matter-antimatter asymmetry. Historically one of the first systems to be studied in the search of symmetry breaking within the Standard Model is the electric dipole moment (EDM) of the neutron. The contribution to the neutron EDM coming from the SM is several order of magnitudes smaller than the current experimental bound, thus providing a unique, background-free window for potential discovery of physics Beyond the Standard Model (BSM). The strong CP-violating term can also contribute to the neutron EDM, as can all the CP-violating effective operators describing, at energies below the electro-weak scale, the contributions from BSM. To constrain all these contributions to the neutron EDM we need to precisely determine the hadronic matrix elements of the corresponding renormalized operators. After a brief introduction on baryon asymmetry and baryogenesis, I summarize the current stuatus for experiments in search of a neutron EDM. I then describe in more details the different CP-violating sources, and some results in Chiral Perturbation Theory precede a discussion on the current status of Lattice QCD calculations. I will in particular focus on the 2 main challenges for these type of calculations: the signal-to-noise ratio and the renormalization. I will discuss several improvement techniques trying to improve these two aspects of the calculation and I will conclude with an optimistic view into the future.

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The pulsed neutron beam EDM experiment

Cited by 12 publications

References 22 publications

Baryon Asymmetric Universe from Spontaneous CP Violation

Baryon Asymmetric Universe from Spontaneous CP Violation

Electric dipole moments and the search for new physics

Flavor-diagonal CP violation: the electric dipole moment

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