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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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Geometry and physics of the Geant4 toolkit for high and medium energy applications
/ Apostolakis, J (CERN) ; Asai, M (SLAC) ; Bogdanov, A G (Moscow Phys. Eng. Inst.) ; Burkhardt, H (CERN) ; Cosmo, G (CERN) ; Elles, S (Annecy, LAPP) ; Folger, G (CERN) ; Grichine, V M (CERN ; Lebedev Inst.) ; Gumplinger, P (TRIUMF) ; Heikkinen, A (Helsinki Inst. of Phys.) et al.
The current status of the Geant4 toolkit and the recent developments for the geometry, electromagnetic and hadronic physics for medium and high energy are presented. The focus of many recent improvements of the toolkit are key applications including the simulation of large Hadron collider (LHC) experiments at CERN. [...]
2009 - 15 p.
- Published in : Radiat. Phys. Chem. 78 (2009) 859-873
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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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Recent developments in G$_{EANT}$4
/ Allison, J (Geant4 Assoc. ; Manchester U.) ; Apostolakis, J (CERN) ; Lee, S B (Korea Elect. Res. Inst., Changwon) ; Amako, K (KEK, Tsukuba ; Geant4 Assoc.) ; Chauvie, S (PRATO, Italy) ; Mantero, A (Genoa U.) ; Shin, J I (Korea Elect. Res. Inst., Changwon) ; Toshito, T (KMI, Nagoya) ; Truscott, P R (QinetiQ) ; Yamashita, T (JAERI-RIKEN, Hyogo) et al.
G eant 4 is a software toolkit for the simulation of the passage of particles through matter. It is used by a large number of experiments and projects in a variety of application domains, including high energy physics, astrophysics and space science, medical physics and radiation protection. [...]
FERMILAB-PUB-16-447-CD.-
2016 - 40 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 835 (2016) 186-225
Fulltext: 10.1016_j.nima.2016.06.125 - PDF; openaccess_1-s2.0-S0168900216306957-main - PDF;
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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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