Production & decay of J/psi particle

Production & decay of J/psi particle

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Credit: DESY/SCIENCE PHOTO LIRARY

Caption: Production & decay of a J/psi particle in the H1 detector at DESY, the German particle physics laboratory in Hamburg. The computer display shows the detector side-on in dark & pale blue, green, & orange. An electron enters from left and a proton from right, both unseen, accelerated in DESY's HERA collider. They meet at centre right to create a J/psi particle, which consists of a charm quark & a charm antiquark. The J/psi lives too briefly to be seen, but is revealed by its decay into a pair of penetrating muons (tracks leading to top & bottom left). The energy recorded for the two muons is equivalent to the mass of the J/psi.

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Keywords: charm quark, charmed particles, computer screen, desy, electronic display, h1 detector, hera collider, high-energy physics, j/psi particle, muons, particle physics research, subatomic particles, the particle odyssey

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