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European Strategy for Particle Physics Update -- PIONEER: a next generation rare pion decay experiment

Fuente: arXiv

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Hauptverfasser:	PIONEER Collaboration, Adelmann, A., Altmannshofer, W., Ban, S., Beesley, O., Bolotnikov, A., Brunner, T., Bryman, D., Buat, Q., Caminada, L., Carlton, J., Chen, S., Chiu, M., Cirigliano, V., Corrodi, S., Crivellin, A., Cuen-Rochin, S., Datta, J., Davis-Purcell, B., Deshpande, A., Di Canto, A., Ebrahimi, A., Fisher, P., Foster, S., Frahm, K., Gerritzen, L., Giacomini, G., Gibbons, L., Glaser, C., Gorringe, T., Hamilton, C., Heinekamp, S., Hertzog, D., Hochrein, S., Hoferichter, M., Ito, S., Iwamoto, T., Kammel, P., Klemets, E., Kurchaninov, L., Labe, K., Langenegger, U., Li, Y., Malbrunot, C., Matsushita, A., Mazza, S. M., Mehrotra, S., Mihara, S., Mischke, R., Molnar, A., Mori, T., Numao, T., Ootani, W., Ott, J., Pachal, K., Pocanic, D., Qian, X., Ries, D., Roehnelt, R., Rohe, T., Rostomyan, T., Schumm, B., Schwendimann, P., Seiden, A., Sher, A., Shrock, R., Soter, A., Sullivan, T., Swanson, E., Tishchenko, V., Tricoli, A., Tsang, T., Uchiyama, Y., Velghe, B., Worcester, M., Worcester, E., Yang, J., Zhang, Y., Zhang, C.
Format:	Preprint
Veröffentlicht:	2025
Schlagworte:	High Energy Physics - Experiment Nuclear Experiment Instrumentation and Detectors
Online-Zugang:	Acceder al recurso
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author	PIONEER Collaboration Adelmann, A. Altmannshofer, W. Ban, S. Beesley, O. Bolotnikov, A. Brunner, T. Bryman, D. Buat, Q. Caminada, L. Carlton, J. Chen, S. Chiu, M. Cirigliano, V. Corrodi, S. Crivellin, A. Cuen-Rochin, S. Datta, J. Davis-Purcell, B. Deshpande, A. Di Canto, A. Ebrahimi, A. Fisher, P. Foster, S. Frahm, K. Gerritzen, L. Giacomini, G. Gibbons, L. Glaser, C. Gorringe, T. Hamilton, C. Heinekamp, S. Hertzog, D. Hochrein, S. Hoferichter, M. Ito, S. Iwamoto, T. Kammel, P. Klemets, E. Kurchaninov, L. Labe, K. Langenegger, U. Li, Y. Malbrunot, C. Matsushita, A. Mazza, S. M. Mehrotra, S. Mihara, S. Mischke, R. Molnar, A. Mori, T. Numao, T. Ootani, W. Ott, J. Pachal, K. Pocanic, D. Qian, X. Ries, D. Roehnelt, R. Rohe, T. Rostomyan, T. Schumm, B. Schwendimann, P. Seiden, A. Sher, A. Shrock, R. Soter, A. Sullivan, T. Swanson, E. Tishchenko, V. Tricoli, A. Tsang, T. Uchiyama, Y. Velghe, B. Worcester, M. Worcester, E. Yang, J. Zhang, Y. Zhang, C.
author_facet	PIONEER Collaboration Adelmann, A. Altmannshofer, W. Ban, S. Beesley, O. Bolotnikov, A. Brunner, T. Bryman, D. Buat, Q. Caminada, L. Carlton, J. Chen, S. Chiu, M. Cirigliano, V. Corrodi, S. Crivellin, A. Cuen-Rochin, S. Datta, J. Davis-Purcell, B. Deshpande, A. Di Canto, A. Ebrahimi, A. Fisher, P. Foster, S. Frahm, K. Gerritzen, L. Giacomini, G. Gibbons, L. Glaser, C. Gorringe, T. Hamilton, C. Heinekamp, S. Hertzog, D. Hochrein, S. Hoferichter, M. Ito, S. Iwamoto, T. Kammel, P. Klemets, E. Kurchaninov, L. Labe, K. Langenegger, U. Li, Y. Malbrunot, C. Matsushita, A. Mazza, S. M. Mehrotra, S. Mihara, S. Mischke, R. Molnar, A. Mori, T. Numao, T. Ootani, W. Ott, J. Pachal, K. Pocanic, D. Qian, X. Ries, D. Roehnelt, R. Rohe, T. Rostomyan, T. Schumm, B. Schwendimann, P. Seiden, A. Sher, A. Shrock, R. Soter, A. Sullivan, T. Swanson, E. Tishchenko, V. Tricoli, A. Tsang, T. Uchiyama, Y. Velghe, B. Worcester, M. Worcester, E. Yang, J. Zhang, Y. Zhang, C.
contents	PIONEER is a rapidly developing effort aimed to perform a pristine test of lepton flavour universality (LFU) and of the unitarity of the first row of the CKM matrix by significantly improving the measurements of rare decays of the charged pion. In Phase I, PIONEER aims to measure the charged-pion branching ratio to electrons vs.\ muons $R_{e/μ}$ to 1 part in $10^4$, improving the current experimental result $R_{e/μ}\,\text{(exp)} =1.2327(23)\times10^{-4}$ by a factor of 15. This precision on $R_{e/μ}$ will match the theoretical accuracy of the SM prediction allowing for a test of LFU at an unprecedented level, probing non-SM explanations of LFU violation through sensitivity to quantum effects of new particles up to the PeV mass scale. Phase II and III will aim to improve the experimental precision of the branching ratio of pion beta decay, $π^+\to π^0 e^+ ν(γ)$, currently at $1.036(6)\times10^{-8}$, by a factor of three and six, respectively. The improved measurements will be used to extract $V_{ud}$ in a theoretically pristine manner. The ultimate precision of $V_{ud}$ is expected to reach the 0.05\,\% level, allowing for a stringent test of CKM unitarity. The PIONEER experiment will also improve the experimental limits by an order of magnitude or more on a host of exotic decays that probe the effects of heavy neutrinos and dark sector physics. This input to the 2026 update of the European Strategy for Particle Physics Strategy describes the physics motivation and the conceptual design of the PIONEER experiment, and is prepared based on the PIONEER proposal submitted to and approved with high priority by the PSI program advisory committee (PAC). Using intense pion beams, and state-of-the-art instrumentation and computational resources, the PIONEER experiment is aiming to begin data taking by the end of this decade.
format	Preprint
id	arxiv_https___arxiv_org_abs_2504_06375
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	European Strategy for Particle Physics Update -- PIONEER: a next generation rare pion decay experiment PIONEER Collaboration Adelmann, A. Altmannshofer, W. Ban, S. Beesley, O. Bolotnikov, A. Brunner, T. Bryman, D. Buat, Q. Caminada, L. Carlton, J. Chen, S. Chiu, M. Cirigliano, V. Corrodi, S. Crivellin, A. Cuen-Rochin, S. Datta, J. Davis-Purcell, B. Deshpande, A. Di Canto, A. Ebrahimi, A. Fisher, P. Foster, S. Frahm, K. Gerritzen, L. Giacomini, G. Gibbons, L. Glaser, C. Gorringe, T. Hamilton, C. Heinekamp, S. Hertzog, D. Hochrein, S. Hoferichter, M. Ito, S. Iwamoto, T. Kammel, P. Klemets, E. Kurchaninov, L. Labe, K. Langenegger, U. Li, Y. Malbrunot, C. Matsushita, A. Mazza, S. M. Mehrotra, S. Mihara, S. Mischke, R. Molnar, A. Mori, T. Numao, T. Ootani, W. Ott, J. Pachal, K. Pocanic, D. Qian, X. Ries, D. Roehnelt, R. Rohe, T. Rostomyan, T. Schumm, B. Schwendimann, P. Seiden, A. Sher, A. Shrock, R. Soter, A. Sullivan, T. Swanson, E. Tishchenko, V. Tricoli, A. Tsang, T. Uchiyama, Y. Velghe, B. Worcester, M. Worcester, E. Yang, J. Zhang, Y. Zhang, C. High Energy Physics - Experiment Nuclear Experiment Instrumentation and Detectors PIONEER is a rapidly developing effort aimed to perform a pristine test of lepton flavour universality (LFU) and of the unitarity of the first row of the CKM matrix by significantly improving the measurements of rare decays of the charged pion. In Phase I, PIONEER aims to measure the charged-pion branching ratio to electrons vs.\ muons $R_{e/μ}$ to 1 part in $10^4$, improving the current experimental result $R_{e/μ}\,\text{(exp)} =1.2327(23)\times10^{-4}$ by a factor of 15. This precision on $R_{e/μ}$ will match the theoretical accuracy of the SM prediction allowing for a test of LFU at an unprecedented level, probing non-SM explanations of LFU violation through sensitivity to quantum effects of new particles up to the PeV mass scale. Phase II and III will aim to improve the experimental precision of the branching ratio of pion beta decay, $π^+\to π^0 e^+ ν(γ)$, currently at $1.036(6)\times10^{-8}$, by a factor of three and six, respectively. The improved measurements will be used to extract $V_{ud}$ in a theoretically pristine manner. The ultimate precision of $V_{ud}$ is expected to reach the 0.05\,\% level, allowing for a stringent test of CKM unitarity. The PIONEER experiment will also improve the experimental limits by an order of magnitude or more on a host of exotic decays that probe the effects of heavy neutrinos and dark sector physics. This input to the 2026 update of the European Strategy for Particle Physics Strategy describes the physics motivation and the conceptual design of the PIONEER experiment, and is prepared based on the PIONEER proposal submitted to and approved with high priority by the PSI program advisory committee (PAC). Using intense pion beams, and state-of-the-art instrumentation and computational resources, the PIONEER experiment is aiming to begin data taking by the end of this decade.
title	European Strategy for Particle Physics Update -- PIONEER: a next generation rare pion decay experiment
topic	High Energy Physics - Experiment Nuclear Experiment Instrumentation and Detectors
url	https://arxiv.org/abs/2504.06375