Search for heavy neutrinos in \(\pi ^{ + } \to \mu ^{ + }\nu \) decay and status of lepton universality test in the PIENU experiment

Autor: T. Numao, Douglas Bryman, Chloé Malbrunot, P. Gumplinger, S. Cuen-Rochin, Dave Britton, Ahmed Hussein, A. Sher, D. Protopopescu, J. R. Comfort, L. S. Littenberg, T. Sullivan, Y. Igarashi, R. E. Mischke, Leonid Kurchaninov, Song Chen, S. Ito, S. H. Kettell, D. Vom Bruch, M. Blecher, Alexis A. Aguilar-Arevalo, Luca Doria, D. Vavilov, Masaharu Aoki

Publikováno v: JPS Conf.Proc.
3rd International Symposium on Science at J-PARC
3rd International Symposium on Science at J-PARC, Sep 2019, Tsukuba, Japan. pp.011131, ⟨10.7566/JPSCP.33.011131⟩

International audience; 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

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::12a8987cf3f87acc9c4a173026c39a61
http://cds.cern.ch/record/2824398

Charged-particle spectra from μ− capture on Al

Autor: Glenn M. Marshall, A. Gaponenko, A. Olin, A. Grossheim, R. E. Mischke, A. Hillairet

Publikováno v: Physical Review

Published data on the emission of charged particles following nuclear muon capture are extremely limited. In addition to its interest as a probe of the nuclear response, these data are important for the design of some current searches for lepton flav

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::2753fa896b8b7670f9255dc8516e0e32
https://doi.org/10.1103/physrevc.101.035502

Improved search for heavy neutrinos in the decay π→eν

Autor: L. S. Littenberg, Song Chen, Douglas Bryman, P. Gumplinger, S. H. Kettell, R. E. Mischke, D. Protopopescu, Ahmed Hussein, Y. Igarashi, J. R. Comfort, C. Malbrunot, Alexis A. Aguilar-Arevalo, D. Vom Bruch, S. Ito, D. Vavilov, Leonid Kurchaninov, M. Blecher, Masaharu Aoki, A. Sher, Luca Doria, T. Sullivan, T. Numao, Dave Britton, S. Cuen-Rochin

Publikováno v: Physical Review

A search for massive neutrinos has been made in the decay π+→e+ν. No evidence was found for extra peaks in the positron energy spectrum indicative of pion decays involving massive neutrinos (π→e+νh). Upper limits (90% C.L.) on the neutrino mi

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::99973ce8f9805246975960b59b789b36
https://doi.org/10.1103/physrevd.97.072012

Precision Measurement of the $\pi$$^+$$\rightarrow$$e^+$$\nu$$_e$ Branching Ratio in the PIENU Experiment

Autor: A. Husseina, D. Protopopescu, D. Vavilov, Alexis A. Aguilar-Arevalo, Dave Britton, J. R. Comfort, L. Doria, Song Chen, Y. Igarashi, D. Vom Bruch, T. Sullivan, Shintaro Ito, A. Sher, T. Numao, Leonid Kurchaninov, Chloé Malbrunot, Masaharu Aoki, S. H. Kettell, L. S. Littenberg, Douglas Bryman, S. Cuen-Rochin, M. Blecher, P. Gumplinger, R. E. Mischke

Publikováno v: Proceedings of The 3rd International Symposium on “Quest for the Origin of Particles and the Universe" — PoS(KMI2017).

The PIENU experiment at TRIUMF aims to measure the branching ratio of the pion decay modes $R^{\pi}=[{\pi}^+{\rightarrow}e^+{\nu}_e({\gamma})]/[{\pi}^+{\rightarrow}{\mu}^+{\nu}_{\mu}({\gamma})]$ with precision of $

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::c9bf42a57fb1db9dd59bf535dbfd4b25
https://doi.org/10.22323/1.294.0034

Improved Measurement of theπ→eνBranching Ratio

Autor: D. Vavilov, T. Numao, M. Ding, Masaharu Aoki, Dave Britton, C. Malbrunot, Ahmed Hussein, Koji Yamada, L. S. Littenberg, T. Sullivan, S. Cuen-Rochin, S. Ito, Douglas Bryman, R. E. Mischke, Y. Igarashi, P. Gumplinger, A. Sher, D. Vom Bruch, Luca Doria, Leonid Kurchaninov, J. R. Comfort, Song Chen, S. H. Kettell, M. Blecher, D. Protopopescu, Alexis A. Aguilar-Arevalo

Publikováno v: Physical Review Letters. 115

A new measurement of the branching ratio R_{e/μ}=Γ(π^{+}→e^{+}ν+π^{+}→e^{+}νγ)/Γ(π^{+}→μ^{+}ν+π^{+}→μ^{+}νγ) resulted in R_{e/μ}^{exp}=[1.2344±0.0023(stat)±0.0019(syst)]×10^{-4}. This is in agreement with the standard model

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_________::7eadb373c2fdd2f1171f4728dd01de4a
https://doi.org/10.1103/physrevlett.115.071801