Searching for the Muon Decay to Three Electrons with the Mu3e Experiment

Mu3e is a dedicated experiment designed to find or exclude the charged lepton flavor violating <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">μ</mi><m...

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Autores principales:	Cristina Martin Perez, Luigi Vigani
Formato:	article
Lenguaje:	EN
Publicado:	MDPI AG 2021
Materias:	Mu3e muons charged lepton flavor violation PSI Elementary particle physics QC793-793.5
Acceso en línea:	https://doaj.org/article/6620a8f4cec74289844f4b0559ae7ac0
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spelling	oai:doaj.org-article:6620a8f4cec74289844f4b0559ae7ac02021-11-25T19:09:37ZSearching for the Muon Decay to Three Electrons with the Mu3e Experiment10.3390/universe71104202218-1997https://doaj.org/article/6620a8f4cec74289844f4b0559ae7ac02021-11-01T00:00:00Zhttps://www.mdpi.com/2218-1997/7/11/420https://doaj.org/toc/2218-1997Mu3e is a dedicated experiment designed to find or exclude the charged lepton flavor violating <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">μ</mi><mo>→</mo></mrow></semantics></math></inline-formula> eee decay at branching fractions above <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>16</mn></mrow></msup></semantics></math></inline-formula>. The search is pursued in two operational phases: Phase I uses an existing beamline at the Paul Scherrer Institute (PSI), targeting a single event sensitivity of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>2</mn><mspace width="0.166667em"></mspace><mo>·</mo><mspace width="0.166667em"></mspace><msup><mn>10</mn><mrow><mo>−</mo><mn>15</mn></mrow></msup></mrow></semantics></math></inline-formula>, while the ultimate sensitivity is reached in Phase II using a high intensity muon beamline under study at PSI. As the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">μ</mi><mo>→</mo></mrow></semantics></math></inline-formula> eee decay is heavily suppressed in the Standard Model of particle physics, the observation of such a signal would be an unambiguous indication of the existence of new physics. Achieving the desired sensitivity requires a high rate of muons (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mn>8</mn></msup></semantics></math></inline-formula> stopped muons per second) along with a detector with large kinematic acceptance and efficiency, able to reconstruct the low momentum of the decay electrons and positrons. To achieve this goal, the Mu3e experiment is mounted with an ultra thin tracking detector based on monolithic active pixel sensors for excellent momentum and vertex resolution, combined with scintillating fibers and tiles for precise timing measurements.Cristina Martin PerezLuigi ViganiMDPI AGarticleMu3emuonscharged lepton flavor violationPSIElementary particle physicsQC793-793.5ENUniverse, Vol 7, Iss 420, p 420 (2021)
institution	DOAJ
collection	DOAJ
language	EN
topic	Mu3e muons charged lepton flavor violation PSI Elementary particle physics QC793-793.5
spellingShingle	Mu3e muons charged lepton flavor violation PSI Elementary particle physics QC793-793.5 Cristina Martin Perez Luigi Vigani Searching for the Muon Decay to Three Electrons with the Mu3e Experiment
description	Mu3e is a dedicated experiment designed to find or exclude the charged lepton flavor violating <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">μ</mi><mo>→</mo></mrow></semantics></math></inline-formula> eee decay at branching fractions above <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mrow><mo>−</mo><mn>16</mn></mrow></msup></semantics></math></inline-formula>. The search is pursued in two operational phases: Phase I uses an existing beamline at the Paul Scherrer Institute (PSI), targeting a single event sensitivity of <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mn>2</mn><mspace width="0.166667em"></mspace><mo>·</mo><mspace width="0.166667em"></mspace><msup><mn>10</mn><mrow><mo>−</mo><mn>15</mn></mrow></msup></mrow></semantics></math></inline-formula>, while the ultimate sensitivity is reached in Phase II using a high intensity muon beamline under study at PSI. As the <inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><mrow><mi mathvariant="sans-serif">μ</mi><mo>→</mo></mrow></semantics></math></inline-formula> eee decay is heavily suppressed in the Standard Model of particle physics, the observation of such a signal would be an unambiguous indication of the existence of new physics. Achieving the desired sensitivity requires a high rate of muons (<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msup><mn>10</mn><mn>8</mn></msup></semantics></math></inline-formula> stopped muons per second) along with a detector with large kinematic acceptance and efficiency, able to reconstruct the low momentum of the decay electrons and positrons. To achieve this goal, the Mu3e experiment is mounted with an ultra thin tracking detector based on monolithic active pixel sensors for excellent momentum and vertex resolution, combined with scintillating fibers and tiles for precise timing measurements.
format	article
author	Cristina Martin Perez Luigi Vigani
author_facet	Cristina Martin Perez Luigi Vigani
author_sort	Cristina Martin Perez
title	Searching for the Muon Decay to Three Electrons with the Mu3e Experiment
title_short	Searching for the Muon Decay to Three Electrons with the Mu3e Experiment
title_full	Searching for the Muon Decay to Three Electrons with the Mu3e Experiment
title_fullStr	Searching for the Muon Decay to Three Electrons with the Mu3e Experiment
title_full_unstemmed	Searching for the Muon Decay to Three Electrons with the Mu3e Experiment
title_sort	searching for the muon decay to three electrons with the mu3e experiment
publisher	MDPI AG
publishDate	2021
url	https://doaj.org/article/6620a8f4cec74289844f4b0559ae7ac0
work_keys_str_mv	AT cristinamartinperez searchingforthemuondecaytothreeelectronswiththemu3eexperiment AT luigivigani searchingforthemuondecaytothreeelectronswiththemu3eexperiment
_version_	1718410219453677568

Searching for the Muon Decay to Three Electrons with the Mu3e Experiment

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