We are very sad to announce that Prof. Simon Eidelman, a distinguished member of the Editorial Board of EPJC, passed away on June 28, 2021.

The scientific activities of Simon, a member of the Budker Institute of Nuclear Physics and of the faculty at the Physics Department of Novosibirsk State University, were mostly connected with experiments at electron-positron colliders, which he was involved in from the very beginning of the field. He started his career by participating in the discovery of multihadron events at VEPP-2. Simon subsequently contributed to the construction of the OLYA detector for the upgraded VEPP-2M collider, where comprehensive studies of electron–positron annihilation into hadrons were conducted up to 1.4 GeV, and later participated in many other experiments such as CMD-2 and CMD-3 at Novosibirsk, Belle and Belle-2 in Japan, and LHCb at CERN. He was among the pioneers in terms of evaluating the hadronic contribution to the anomalous magnetic moment of the muon, based on measurements taken at \(e^+e^-\) colliders. For many years Simon was an active member of the Particle Data Group.

We were very fortunate that Simon’s many interests encompassed editorial activities, which led him to accept our invitation to join the editorial board of EPJC in 2019, where he immediately proved to be of tremendous help in handling the many incoming manuscripts in his field of expertise. His profound understanding of both experimental and theoretical aspects of particle physics ensured the high quality of the papers he handled. We will miss his expert contributions to the running of the journal and cherish our fond memories of a kind and warm-hearted colleague.

Günther Dissertori

For the Editorial Board

Christian Caron

For the Publisher