Re: new subatomic particle Ds (2317) -- AMIGA Astronomy

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Subject: Re: new subatomic particle Ds (2317)

Author:
Blobrana

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Date Posted: 09:48:46 07/01/03 Tue
In reply to: xxx 's message, "new subatomic particle Ds (2317)" on 13:37:53 04/30/03 Wed

>Physicists have found a new subatomic particle, named
>Ds (2317). It will help them better understand the
>building blocks of matter.
>
>
Check out THIS particle!
A pentaquark particle is created in high energy collisions at the SPring-8 accelerator in Japan and at the Jefferson Lab in the US.
First, an energetic gamma ray, or photon, strikes a nucleus. Within the nucleus are nucleons, which are either protons (consisting in turn of two "up" quarks and one "down" quark) and neutrons (consisting of two down quarks and one up quark). In some collisions, the debris particles will include a pentaquark (consisting of 2 up quarks, 2 down quarks, and a strange antiquark), a negative K meson (a strange quark and an up antiquark), and other particles.
Later, after a time not yet determined (but maybe as short as 10-20 seconds), the pentaquark decays into a positively charged K meson (up quark plus strange antiquark) plus a neutron, which are sensed in detectors farther along. Studying the properties of the end-product neutrons and K+ mesons is what determines the existence of the pentaquark.

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Replies:

Subject	Author	Date
Re: pentaquark particle	Blobrana	15:48:02 02/06/04 Fri