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Study of $\chi_{bJ}(nP) \rightarrow \omega \Upsilon(1S)$ at Belle / Belle Collaboration
We report results from a study of hadronic transitions of the

$\chi_{bJ}(nP)$ states of bottomonium at Belle. [...]
arXiv:2108.03497 ; BELLE-CONF-2102. - 12.
Fulltext

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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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Search for the rare decays $\pi^+ \to \mu^+\nu_\mu\nu\bar\nu$ and $\pi^+ \to e^+\nu_e\nu\bar\nu$ / PIENU Collaboration
The rare pion decays

${\pi}^+{\rightarrow}{\mu}^+{\nu}_{\mu}{\nu}\bar{\nu}$ and

${\pi}^+{\rightarrow}e^+{\nu}_{e}{\nu}\bar{\nu}$ are allowed in the Standard Model but highly suppressed. These decays were searched for using data from the PIENU experiment. [...]
arXiv:2006.00389.- 2020-07-01 - 9 p. - Published in : Phys. Rev. D 102 (2020) 012001 Fulltext: PDF; Fulltext from Publisher: PDF;

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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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Search for Heavy Neutrinos in $\pi \to \mu\nu$ Decay / PIENU Collaboration
Heavy neutrinos were sought in pion decays

$\pi^+ \rightarrow \mu^+ \nu$ by examining the observed muon energy spectrum for extra peaks in addition to the expected peak for a massless neutrino. No evidence for heavy neutrinos was observed. [...]
arXiv:1904.03269.- 2019-11-10 - 5 p. - Published in : Phys. Lett. B 798 (2019) 134980 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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Measurement of Michel Parameters ( $\bar\eta$ , $\xi\kappa$ ) in the radiative leptonic decay of tau at Belle / Belle Collaboration
We present the first measurement of the Michel parameters

$\bar{\eta}$ and

$\xi\kappa$ in the radiative leptonic decay of the

$\tau$ lepton using 703 f

$\mathrm{b}^{-1}$ of data collected with the Belle detector at the KEKB

$e^+e^-$ collider. The Michel parameters are measured by an unbinned maximum likelihood fit to the kinematic information of

$e^+e^-\rightarrow\tau^+\tau^-\rightarrow (\pi^+\pi^0 \bar{\nu})(l^-\nu\bar{\nu}\gamma)$

$(l=e$ or

$\mu)$ . [...]
arXiv:1609.08280.- 2017-06-22 - 4 p. - Published in : Nucl. Part. Phys. Proc. 287-288 (2017) 11-14 Fulltext: PDF; External link: Preprint
In : The 14th International Workshop on Tau Lepton Physics (Tau2016), Beijing, China, 18 - 23 Sep 2016, pp.11-14

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10.

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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Смотрите также: похожие имена автора
9	Igarashi, Y.
3	Igarashi, Yoshihide
3	Igarashi, Youichi
3	Igarashi, Yuichi
9	Igarashi, Yuji

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