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Search for heavy neutrinos in \(\pi ^{ + } \to \mu ^{ + }\nu \) decay and status of lepton universality test in the PIENU experiment
/ Ito, S (Osaka U. ; Okayama U.) ; Aguilar-Arevalo, A (Mexico U., ICN) ; Aoki, M (Osaka U.) ; Blecher, M (Virginia Tech.) ; Britton, D I (Glasgow U.) ; vom Bruch, D (British Columbia U. ; Paris U., VI-VII) ; Bryman, D A (British Columbia U. ; TRIUMF) ; Chen, S (Tsinghua U., Beijing, Dept. Eng. Phys.) ; Comfort, J (Arizona State U.) ; Doria, L (TRIUMF ; Mainz U., Inst. Kernphys. ; U. Mainz, PRISMA) et al.
In the present work of the PIENU experiment, heavy neutrinos were sought in pion decays \(\pi ^{ + } \to \mu ^{ + }\nu \). No evidence for extra peak was found in the muon kinetic energy spectrum and 90% confidence level upper limits were set on the neutrino mixing matrix \(|U_{\mu i}|^{2}\) in the mass range of 15.7 to 33.8 MeV/c^2, improving an order of magnitude over previous experiments. [...]
2021 - 6 p.
- Published in : JPS Conf. Proc. 33 (2021) 011131-1-011131-6
Fulltext: PDF;
In : J-PARC Symposium 2019, Tsukuba, Japan, 23 - 26 Sep 2019, pp.011131-1-011131-6
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Improved search for two body muon decay ${\mu}^+{\rightarrow}e^+X_H$
/ PIENU Collaboration
Charged lepton flavor violating muon decay ${\mu}^+{\rightarrow}e^+X_H$, where $X_H$ is a massive neutral boson, was sought by searching for extra peaks in the muon decay ${\mu}^+{\rightarrow}e^+{\nu}\bar{\nu}$ energy spectrum in the $m_{X_H}$ mass region $47.8-95.1$ MeV/$c^2$. No signal was found and 90% confidence level upper limits were set on the branching ratio ${\Gamma}({\mu}^+{\rightarrow}e^+X_H)/{\Gamma}({\mu}^+{\rightarrow}e^+{\nu}\bar{\nu})$ at the level of $10^{-5}$ for this region..
arXiv:2002.09170.-
2020-03-31 - 4 p.
- Published in : Phys. Rev. D 101 (2020) 052014
Article from SCOAP3: PDF; Fulltext: PDF;
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Initial results from the PIENU experiment
/ Sullivan, Tristan (U. British Columbia (main)) ; Aguilar-Arevalo, A (Mexico U., ICN) ; Aoki, M (Osaka U. (main)) ; Blecher, M (Virginia Tech.) ; Britton, D I (Glasgow U.) ; Bryman, D A (U. British Columbia (main)) ; vom Bruch, D (Mainz U.) ; Chen, S (Tsinghua U., Beijing) ; Comfort, J (Arizona State U., Tempe) ; Cuen-Rochin, S (U. British Columbia (main)) et al.
The pion branching ratio, $R_{\pi} = \frac{\Gamma ( \pi^+ \to e^+ \nu_e + \pi^+ \to e^+ \nu_e \gamma)}{\Gamma (\pi^+ \to \mu^+ \nu_{\mu} + \pi^+ \to \mu^+ \nu_{\mu} \gamma)}$ , provides a sensitive test of lepton universality and constraints on many new physics scenarios. The theoretical uncertainty on the Standard Model prediction of $R_{\pi}$ is 0.02%, a factor of twenty smaller than the experimental uncertainty. [...]
SISSA, 2017 - 8 p.
- Published in : PoS HQL2016 (2017) 043
Fulltext: PDF; External link: PoS server
In : 13th International Conference on Heavy Quarks and Leptons, Blacksburg, Virginia, USA, 22 - 27 May 2016, pp.043
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Initial results from the PIENU experiment
/ Sullivan, T (British Columbia U.) ; Aguilar-Arevalo, A (Mexico U., ICN) ; Aoki, M (Osaka U.) ; Blecher, M (Virginia Tech.) ; Britton, D I (Glasgow U.) ; Bryman, D A (British Columbia U.) ; Bruch, D vom (Mainz U.) ; Chen, S (Tsinghua U., Beijing) ; Comfort, J (Arizona State U.) ; Cuen-Rochin, S (British Columbia U.) et al.
The pion branching ratio, $R_{\pi } = \frac { {\Gamma }(\pi ^{+} \rightarrow e^{+} \nu _{e} + \pi ^{+}\rightarrow e^{+} \nu _{e} \gamma )}{\Gamma (\pi ^{+} \rightarrow \mu ^{+} \nu _{\mu } + \pi ^{+} \rightarrow \mu ^{+} \nu _{\mu } \gamma )}$ , provides a sensitive test of lepton universality and constraints on many new physics scenarios. The theoretical uncertainty on the Standard Model prediction of R$_{π}$ is 0.02 %, a factor of twenty smaller than the experimental uncertainty. [...]
2017 - 5 p.
- Published in : Hyperfine Interact. 238 (2017) 3
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.3
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Search for massive neutrinos in ${\pi }^{+}{\rightarrow }e^{+}{\nu }_{e}$ decay
/ Ito, S (Osaka U.) ; Aguilar-Arevalo, A (Mexico U., ICN) ; Aoki, M (Osaka U.) ; Blecher, M (Virginia Tech.) ; Britton, D I (Glasgow U.) ; Bryman, D A (British Columbia U.) ; Bruch, D vom (British Columbia U.) ; Chen, S (Tsinghua U., Beijing) ; Comfort, J (Arizona State U.) ; Cuen-Rochin, S (British Columbia U.) et al.
The PIENU experiment aims to measure the branching ratio of the charged pion decay with precision of < 0.1 %. This measurement is much sensitive to search for massive neutrinos coupled to electrons in ${\pi }^{+}{\rightarrow }e^{+}{\nu }_{e}$ decay. [...]
2017 - 5 p.
- Published in : Hyperfine Interact. 238 (2017) 1
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.1
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Status of the PIENU experiment at TRIUMF
/ Ito, S (Osaka U.) ; Aguilar-Arevalo, A (Mexico U., ICN) ; Aoki, M (Osaka U.) ; Blecher, M (Virginia Tech.) ; Britton, D I (Glasgow U.) ; Bryman, D A (British Columbia U.) ; vom Bruch, D (British Columbia U.) ; Chen, S (Tsinghua U., Beijing) ; Comfort, J (Arizona State U.) ; Cuen-Rochin, S (British Columbia U.) et al.
The PIENU experiment at TRIUMF aims to measure the branching ratio of pion decays R = Γ(π(+) → e(+)ν(e) + π(+) → e(+) ν(e)γ)/Γ(π(+)→μ(+)ν(μ) + π(+) → μ(+)ν(μ)γ) with precision <0.1%, providing a stringent test of the Standard Model hypothesis of electron-muon universality and a search for new physics..
2015 - 11 p.
- Published in : J. Phys.: Conf. Ser. 631 (2015) 012044
Fulltext: PDF;
In : 4th Symposium on Prospects in the Physics of Discrete Symmetries, London, UK, 2 - 6 Dec 2014, pp.012044
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