TY - JOUR

T1 - Recent results from MEG and status update for MEG II

AU - MEG II Collaboration

N1 - The collaboration thanks the Paul Scherrer Institute as hosting facility and their staff for the support in running the experiment. MEG II is supported by DOE DEFG02-91ER40679 (USA); INFN (Italy); MIUR Montalcini D.M. 2014 n. 975 (Italy); JSPS KAKENHI numbers JP22000004, JP26000004, JP17J04114, JSPS Core-to-Core Program, A. Advanced Research Networks JPJSCCA20180004 (Japan); SNF grants 200021 137738 and 200020 172706 (Switzerland); Russian Federation Ministry of Education and Science, and Russian Fund for Basic Research grant RFBR-14-22-03071.

PY - 2021

Y1 - 2021

N2 - The MEG experiment completed data taking in 2013 after several years and published in 2016 the most stringent upper limit on the BR(μ+ → e+γ) < 4.2 × 10−13 at 90 % confidence level. Recently, the search for μ+ → e+X, X → γγ was conducted using the full MEG data sample and the results reported. To improve the sensitivity to the BR(μ+ → e+γ) down to 6 × 10−14, the experiment has been upgraded as MEG II. The MEG II apparatus is ready for an engineering run at the end of 2021. Furthermore, MEG II plans to perform a measurement of the beryllium anomaly in the beginning of 2022.

AB - The MEG experiment completed data taking in 2013 after several years and published in 2016 the most stringent upper limit on the BR(μ+ → e+γ) < 4.2 × 10−13 at 90 % confidence level. Recently, the search for μ+ → e+X, X → γγ was conducted using the full MEG data sample and the results reported. To improve the sensitivity to the BR(μ+ → e+γ) down to 6 × 10−14, the experiment has been upgraded as MEG II. The MEG II apparatus is ready for an engineering run at the end of 2021. Furthermore, MEG II plans to perform a measurement of the beryllium anomaly in the beginning of 2022.

M3 - Conference article

VL - EW

SP - 355

EP - 358

JO - Proceedings of the 55th Rencontres de Moriond 2021

JF - Proceedings of the 55th Rencontres de Moriond 2021

ER -