Averages of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties as of 2018

• Main Authors: Y. Amhis, Sw. Banerjee, E. Ben-Haim, F. U. Bernlochner, M. Bona, A. Bozek, C. Bozzi, J. Brodzicka, M. Chrzaszcz, J. Dingfelder, S. Duell, U. Egede, M. Gersabeck, T. Gershon, P. Goldenzweig, K. Hayasaka, H. Hayashii, D. Johnson, M. Kenzie, T. Kuhr, O. Leroy, H.-B. Li, A. Lusiani, H.-L. Ma, K. Miyabayashi, P. Naik, T. Nanut, M. Patel, A. Pompili, M. Rama, M. Roney, M. Rotondo, O. Schneider, C. Schwanda, A. J. Schwartz, B. Shwartz, J. Serrano, A. Soffer, D. Tonelli, P. Urquijo, R. Van Kooten, J. Yelton
• Format: Article
• Language: English
• Published: SpringerOpen 2021-03-01
• Series: European Physical Journal C: Particles and Fields
• Online Access: https://doi.org/10.1140/epjc/s10052-020-8156-7
• ISSN: 1434-6044; 1434-6052

Abstract This paper reports world averages of measurements of b-hadron, c-hadron, and $$\tau $$ τ -lepton properties obtained by the Heavy Flavour Averaging Group using results available through September 2018. In rare cases, significant results obtained several months later are also used. For the averaging, common input parameters used in the various analyses are adjusted (rescaled) to common values, and known correlations are taken into account. The averages include branching fractions, lifetimes, neutral meson mixing parameters, $$C\!P$$ C P  violation parameters, parameters of semileptonic decays, and Cabibbo–Kobayashi–Maskawa matrix elements.