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Publications (16)

hep-ex2024

Measurement of the response function of the PIENU calorimeter

A. Aguilar-Arevalo, M. Aoki, M. Blecher +17

Measurements of the response function of the PIENU NaI(T $ℓ$ ) and CsI crystal calorimeter using a monochromatic 70 MeV/c positron beam at various incidence angles are described.…

hep-ex2020

Search for the rare decays $I ¨ ^{+} \to I^¼^{+} I^½_{I^} ¼ I^½ I^ˉ ½$ and $I ¨ ^{+} \to e^{+} I^½_{e} I^½ I^ˉ ½$

A. Aguilar-Arevalo, M. Aoki, M. Blecher +23

The rare pion decays $I ¨ ^{+} \to I^¼^{+} I^½_{I^} ¼ I^½ I^ˉ ½$ and $I ¨ ^{+} \to e^{+} I^½_{e} I^½ I^ˉ ½$ are allowed in the Standard Model but highly suppressed. These decays were search…

astro-ph.IM2021

Supernova Model Discrimination with Hyper-Kamiokande

Kamiokande Collaboration, K. Abe, P. Adrich +499

Core-collapse supernovae are among the most magnificent events in the observable universe. They produce many of the chemical elements necessary for life to exist and their remnants…

physics.ins-det2020

The Hyper-Kamiokande Experiment -- Snowmass LOI

Kamiokande Collaboration, K. Abe, P. Adrich +387

Hyper-Kamiokande is the next generation underground water Cherenkov detector that builds on the highly successful Super-Kamiokande experiment. The detector which has an 8.4~times l…

hep-ex2018

Improved Search for Heavy Neutrinos in the Decay $I ¨ \to e I^½$

A. Aguilar-Arevalo, M. Aoki, M. Blecher +21

A search for massive neutrinos has been made in the decay $I ¨ \to e^{+} I^½$ . No evidence was found for extra peaks in the positron energy spectrum indicative of pion decays in…

hep-ex2018

Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay $Ï^+ \rightarrow \mbox{e}^+ Î½$

R. E. Mischke, A. Aguilar-Arevalo, M. Aoki +21

Two results from the PIENU Experiment are presented reporting a test of lepton universality in pion decay and improved limits on heavy neutrinos coupling to positrons. The status o…

hep-ex2025

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

PIONEER Collaboration, A. Adelmann, W. Altmannshofer +76

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 significantl…

hep-ex2021

Search for three body pion decays $I ¨ ^{+} \to l^{+} I^½ X$

A. Aguilar-Arevalo, M. Aoki, M. Blecher +21

The three body pion decays $I ¨ ^{+} \to l^{+} I^½ X (l = e, I^¼)$ , where $X$ is a weakly interacting neutral boson, were searched for using the full data set from the PIENU experiment.…

hep-ex2022

PIONEER: Studies of Rare Pion Decays

PIONEER Collaboration, W. Altmannshofer, H. Binney +58

A next-generation rare pion decay experiment, PIONEER, is strongly motivated by several inconsistencies between Standard Model (SM) predictions and data pointing towards the potent…

hep-ex2022

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

PIONEER Collaboration, W. Altmannshofer, H. Binney +58

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 d…

physics.ins-det2015

Status of the TRIUMF PIENU Experiment

S. Ito, A. Aguilar-Arevalo, M. Aoki +21

The PIENU experiment at TRIUMF aims to measure the pion decay branching ratio $R = I^ (I ¨ ^{+} \to e^{+} I^½_{e} (I^^{3})) / I^ (I ¨ ^{+} \to I^¼^{+} I^½_{I^} ¼ (I^^{3}))$ with precision $< 0.1$ % to prov…

hep-ex2020

Improved search for two body muon decay $I^¼^{+} \to e^{+} X_{H}$

A. Aguilar-Arevalo, M. Aoki, M. Blecher +21

Charged lepton flavor violating muon decay $I^¼^{+} \to e^{+} X_{H}$ , where $X_{H}$ is a massive neutral boson, was sought by searching for extra peaks in the muon decay $Î¼^+{\right…

hep-ex2015

Improved measurement of the $Ï\rightarrow \mbox{e} Î½$ branching ratio

A. Aguilar-Arevalo, M. Aoki, M. Blecher +23

A new measurement of the branching ratio, $R_{e/Î¼} =Î(Ï^+ \rightarrow \mbox{e}^+ Î½+ Ï^+ \rightarrow \mbox{e}^+ Î½Î³)/ Î(Ï^+ \rightarrow Î¼^+ Î½+ Ï^+ \rightarrow Î¼^+ Î½Î³)$…

physics.ins-det2015

Detector for measuring the $I ¨ ^{+} \to e^{+} I^½_{e}$ branching fraction

A. A. Aguilar-Arevalo, M. Aoki, M. Blecher +24

The PIENU experiment at TRIUMF is aimed at a measurement of the branching ratio $R^{e / I^¼}$ = ${Î\big((Ï^{+} \rightarrow e^{+} Î½_{e}) + (Ï^{+} \rightarrow e^{+} Î½_{e}Î³)\big)}/…

physics.ins-det2025

Assembly, testing, and installation of mPMT photosensor for the Water Cherenkov Test Experiment

M. Gola, M. Barbi, V. Berardi +46

The multi-Photomultiplier Tube (mPMT) photosensors will be used in the Water Cherenkov Test Experiment (WCTE) to efficiently detect the photons produced in the whole detector. One…

hep-ex2019

Search for Heavy Neutrinos in $I ¨ \to I^¼ I^½$ Decay

A. Aguilar-Arevalo, M. Aoki, M. Blecher +21

Heavy neutrinos were sought in pion decays $I ¨ ^{+} \to I^¼^{+} I^½$ by examining the observed muon energy spectrum for extra peaks in addition to the expected peak for a massless…

Publications (16)

Measurement of the response function of the PIENU calorimeter

Search for the rare decays I¨+→I^¼+I^½I^​¼I^½I^ˉ½ and I¨+→e+I^½e​I^½I^ˉ½

Supernova Model Discrimination with Hyper-Kamiokande

The Hyper-Kamiokande Experiment -- Snowmass LOI

Improved Search for Heavy Neutrinos in the Decay I¨→eI^½

Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay $Ï^+ \rightarrow \mbox{e}^+ Î½$

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

Search for three body pion decays I¨+→l+I^½X

PIONEER: Studies of Rare Pion Decays

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

Status of the TRIUMF PIENU Experiment

Improved search for two body muon decay I^¼+→e+XH​

Improved measurement of the $Ï\rightarrow \mbox{e} Î½$ branching ratio

Detector for measuring the I¨+→e+I^½e​ branching fraction

Assembly, testing, and installation of mPMT photosensor for the Water Cherenkov Test Experiment

Search for Heavy Neutrinos in I¨→I^¼I^½ Decay

Search for the rare decays $I ¨ ^{+} \to I^¼^{+} I^½_{I^} ¼ I^½ I^ˉ ½$ and $I ¨ ^{+} \to e^{+} I^½_{e} I^½ I^ˉ ½$

Improved Search for Heavy Neutrinos in the Decay $I ¨ \to e I^½$

Improved Search for Heavy Neutrinos and a Test of Lepton Universality in the Decay $Ï^+ \rightarrow \mbox{e}^+ Î½$

Search for three body pion decays $I ¨ ^{+} \to l^{+} I^½ X$

Improved search for two body muon decay $I^¼^{+} \to e^{+} X_{H}$

Improved measurement of the $Ï\rightarrow \mbox{e} Î½$ branching ratio

Detector for measuring the $I ¨ ^{+} \to e^{+} I^½_{e}$ branching fraction

Search for Heavy Neutrinos in $I ¨ \to I^¼ I^½$ Decay