PoS - Proceedings of Science
Volume 332 - XIV International Conference on Heavy Quarks and Leptons (HQL2018) - Kaon Physics
Measurement of $\Gamma(K_{e2})/\Gamma(K_{\mu2})$ ratio using stopped positive kaons at J-PARC
S. Shimizu*  on behalf of the JPARC-E36 Collaboration
Full text: pdf
Pre-published on: December 05, 2018
Published on: December 11, 2018
Abstract
The J-PARC E36 experiment is aiming at searching for the lepton universality violation by precisely measuring the ratio of the branching
ratio of the $K^+ \rightarrow e^+ \nu$ ($K_{e2}$) and $K^+ \rightarrow \mu^+\nu$ ($K_{\mu 2}$) decays.he E36 experiment was performed at J-PARC employing a stopped $K^+$ beam in conjunction with a 12-sector iron-core superconducting toroidal spectrometer. Charged particle momentum was calculated by reconstructing the tracks in the spectrometer. Particle discrimination between $e^+$ and $\mu^+$ was carried out using an aerogel Cherenkov counters and a lead-glass Cherenkov counter, as well as by measuring the time-of-flight between TOF counters. The peak structure due to the $K_{e2}$ decays was successfully observed in the $e^+$ momentum spectrum. The structure-dependent radiative $K^+ \rightarrow e^+ \nu
\gamma$ ($K_{e2 \gamma}$) events can be selected by requiring one photon hit in the CsI(Tl) calorimeter. The experimental spectra were reproduced by the Monte Carlo simulation, which indicates a correctunderstanding of the experimental conditions.
DOI: https://doi.org/10.22323/1.332.0032
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.