PIONEER: Studies of Rare Pion Decays

Collaboration, PIONEER; Altmannshofer, W.; Binney, H.; Blucher, E.; Bryman, D.; Caminada, L.; Chen, S.; Cirigliano, V.; Corrodi, S.; Crivellin, A.; Cuen-Rochin, S.; DiCanto, A.; Doria, L.; Gaponenko, A.; Garcia, A.; Gibbons, L.; Glaser, C.; Godoy, M. Escobar; Göldi, D.; Gori, S.; Gorringe, T.; Hertzog, D.; Hodge, Z.; Hoferichter, M.; Ito, S.; Iwamoto, T.; Kammel, P.; Kiburg, B.; Labe, K.; LaBounty, J.; Langenegger, U.; Malbrunot, C.; Mazza, S. M.; Mihara, S.; Mischke, R.; Mori, T.; Mott, J.; Numao, T.; Ootani, W.; Ott, J.; Pachal, K.; Polly, C.; Počanić, D.; Qian, X.; Ries, D.; Roehnelt, R.; Schumm, B.; Schwendimann, P.; Seiden, A.; Sher, A.; Shrock, R.; Soter, A.; Sullivan, T.; Tarka, M.; Tischenko, V.; Tricoli, A.; Velghe, B.; Wong, V.; Worcester, E.; Worcester, M.; Zhang, C.

doi:10.48550/arxiv.2203.01981

Cited by 9 publications

(15 citation statements)

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“…The uncertainty in the PIENU measurement of R (π) e/µ is ≃ 2 × 10 −3 , while the estimated uncertainty in the theoretical calculation of R (π) e/µ is 1.2 × 10 −4 . There are plans for a new experiment called PIONEER at PSI, which will measure BR(π + → e + ν e ) to an accuracy of ∼ 10 −4 , matching the accuracy of theoretical calculation [22,23]. This will enable a more stringent test for heavy neutrino effects, as well as testing e − µ universality to higher precision.…”

Section: Peak Search Testmentioning

confidence: 99%

Some Theoretical Aspects of Searches for Heavy Neutrino Emission in Kaon Decays

Shrock

2023

J. Phys.: Conf. Ser.

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Searches for heavy neutrino emission in K + → e + νe and K + → μ + νµ decays have provided very powerful constraints on sterile neutrinos and their mixings. In this talk at Kaon-2022 we discuss theoretical aspects of these searches and remark on recent experimental progress.

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Section: Peak Search Testmentioning

confidence: 99%

Some Theoretical Aspects of Searches for Heavy Neutrino Emission in Kaon Decays

Shrock

2023

J. Phys.: Conf. Ser.

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“…In this section, each component of this conceptual design is briefly described and opportunities for detector innovation and R&D are identifed. More detail is available in [9]. FIG.…”

Section: B Conceptual Designmentioning

confidence: 99%

“…The purification system and the cryostat design (needed to maintain the xenon at 165 K [66]) of MEG will be considered for scaling up the design for PIONEER. Details of the cryogenics, purification, and mechanical engineering have been considered and are described in more detail in [9].…”

Section: Liquid Xenon Calorimetermentioning

confidence: 99%

“…A new experiment, PIONEER, is proposed at the Paul Scherrer Institute (PSI), where the highest intensity low energy pion beams are delivered. The Phase I of PIONEER [9], which has been approved by PSI (CHRISP -Swiss Research InfraStructure for Particle physics) program advisory committee with high priority, will bridge the gap of a factor 15 between theoretical and experimental precision for R e/µ . With measurements at the 0.01% level in precision, NP up to the PeV scale [14] may be revealed.…”

Section: Introductionmentioning

confidence: 99%

“…This Snowmass white paper describes the physics motivation and the conceptual design of the PIONEER experiment, and is prepared based on the PIONEER proposal [9] submitted to and approved with high priority by the PSI (CHRISP -Swiss Research InfraStructure for Particle physics) program advisory committee. Using intense pion beams, and state-ofthe-art instrumentation and computational resources, the PIONEER experiment is aiming to take data at PSI by the end of this decade.…”

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confidence: 99%

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Testing Lepton Flavor Universality and CKM Unitarity with Rare Pion Decays in the PIONEER experiment

Collaboration¹,

Altmannshofer²,

Binney³

et al. 2022

Preprint

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The physics motivation and the conceptual design of the PIONEER experiment, a next-generation rare pion decay experiment testing lepton flavor universality and CKM unitarity, are described. Phase I of the PIONEER experiment, which was proposed and approved at Paul Scherrer Institut, aims at measuring the charged-pion branching ratio to electrons vs. muons, R e/µ , 15 times more precisely than the current experimental result, reaching the precision of the Standard Model (SM) prediction at 1 part in 10 4 . Considering several inconsistencies between the SM predictions and data pointing towards the potential violation of lepton flavor universality, the PIONEER experiment will probe non-SM explanations of these anomalies through sensitivity to quantum effects of new particles up to the PeV mass scale. The later phases of the PIONEER experiment aim at improving the experimental precision of the branching ratio of pion beta decay (BRPB), π + → π 0 e + ν(γ), currently at 1.036(6) × 10 −8 , by a factor of three (Phase II) and an order of magnitude (Phase III). Such precise measurements of BRPB will allow for tests of CKM unitarity in light of the Cabibbo Angle Anomaly and the theoretically cleanest extraction of |V ud | at the 0.02% level, comparable to the deduction from superallowed beta decays.

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The present and future status of heavy neutral leptons

Abdullahi

Alzás

Batell

et al. 2023

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

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The existence of nonzero neutrino masses points to the likely existence of multiple Standard Model neutral fermions. When such states are heavy enough that they cannot be produced in oscillations, they are referred to as heavy neutral leptons (HNLs). In this white paper, we discuss the present experimental status of HNLs including colliders, beta decay, accelerators, as well as astrophysical and cosmological impacts. We discuss the importance of continuing to search for HNLs, and its potential impact on our understanding of key fundamental questions, and additionally we outline the future prospects for next-generation future experiments or upcoming accelerator run scenarios.

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PIONEER: Studies of Rare Pion Decays

Cited by 9 publications

References 0 publications

Some Theoretical Aspects of Searches for Heavy Neutrino Emission in Kaon Decays

Some Theoretical Aspects of Searches for Heavy Neutrino Emission in Kaon Decays

Testing Lepton Flavor Universality and CKM Unitarity with Rare Pion Decays in the PIONEER experiment

The present and future status of heavy neutral leptons

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