Bubble chamber photo of sigma particle decay

Bubble chamber photo of sigma particle decay

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Credit: BROOKHAVEN LABORATORY/SCIENCE PHOTO LIBRARY

Caption: Bubble chamber photo of sigma particle decay. The sigma lives too briefly to be seen; its presence is deduced from other particles. A neutrino enters unseen at bottom & collides with a proton in the bubble chamber liquid, producing the sigma & a negative muon. The sigma decays to 1 negative & 3 positive pions, & a neutral lambda which leaves no track but betrays itself when it decays at lower centre (within the loop) to a proton & a negative pion. Negative particles curl anticlockwise, positive ones clockwise in the magnetic field. One positive pion is of lower energy & forms the loop; the muon & one of the pions knock out atomic electrons which produce the two spiral tracks.

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Keywords: black and white, black-and-white, bubble chamber, charm, charm quark, charmed particles, electron, image, images, impact event force energy, magnified image, microscopic photos, monochrome image, motion action, move movement moving, muon, particle physics, photo, pion, quark, sigma particle, subjects

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