Concept

Upsilon meson

The Upsilon meson (_Upsilon) is a quarkonium state (i.e. flavourless meson) formed from a bottom quark and its antiparticle. It was discovered by the E288 experiment team, headed by Leon Lederman, at Fermilab in 1977, and was the first particle containing a bottom quark to be discovered because it is the lightest that can be produced without additional massive particles. It has a lifetime of 1.21e-20s and a mass about 9.46GeV/c2 in the ground state.

Official source

https://en.wikipedia.org/wiki/Upsilon_meson

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Related publications (1)

First Observation of Quantum Correlations in e+e-→XDD¯ and C-Even Constrained DD¯ Pairs

The study of meson pairs produced with quantum correlations gives direct access to parameters that are challenging to measure in other systems. In this Letter, the existence of quantum correlations due to charge-conjugation symmetry C are demonstrated in DD¯ pairs produced through the processes e+e-→DD¯, e+e-→D∗D¯, and e+e-→D∗D¯∗, where the lack of charge superscripts refers to an admixture of neutral-charm-meson particle and antiparticle states, using 7.13 fb-1 of e+e- collision data collected by the BESII

2025

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Bottom quark

The bottom quark or b quark, also known as the beauty quark, is a third-generation heavy quark with a charge of −1/3 e. All quarks are described in a similar way by electroweak and quantum chromodynamics, but the bottom quark has exceptionally low rates of transition to lower-mass quarks. The bottom quark is also notable because it is a product in almost all top quark decays, and is a frequent decay product of the Higgs boson. The bottom quark was first described theoretically in 1973 by physicists Makoto Kobayashi and Toshihide Maskawa to explain CP violation.

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