breaking symmetry in the strong force


	breaking symmetry in the strong force

doodleicious

4-12-2009 10:30 PM

173 views

tags:

pions, hadrons

doodleicious says:

the supercomputer at the High Energy Accelerator Research Org. (KEK) in Tsukuba- was used to verify the small mass of the pion within the fundamental theory of quantum chromodynamics

2 Comments |

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4-13-2009 6:50 AM

ratcatcher2

Heavy.

4-13-2009 7:32 AM

zadoz

not heavy ....very,very light

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<div style="margin: 12px 0px; font-family: arial; color: #333333; background: #ffffff; border: solid 4px #e5e5e5; width: 100%; clear: left;"><div class="CM_CTB_Content_Wrap" style="margin: 0px; padding: 0px;background-color: #ffffff;"><div style="border-bottom: solid 1px #dcdcdc; white-space: nowrap; margin-bottom: 8px; background-color: #eeeeee ;background-image: url(http://clipmarks.com/images/source-bg.gif); background-repeat: repeat-x; height: 24px; line-height: 24px; vertical-align: middle; padding-bottom: 4px; color: #666666; font-size: 10px;" ><a href="http://clipmarks.com/clip-to-blog/" title="see clips that are hot right now"><img src="http://content.clipmarks.com/blog_embed/0806ff96-e360-497a-89cb-eb43680c8096/90EDB5CC-4493-4491-8E61-D29A9F78DD17/" alt="" width="19" height="19" border="0" style="vertical-align: middle; margin: 0px 4px; display: inline; border: none; float:none;" /></a>clipped from <a title="http://www.rikenresearch.riken.jp/research/669/" href="http://www.rikenresearch.riken.jp/research/669/" style="font-size: 11px;">www.rikenresearch.riken.jp</a></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.rikenresearch.riken.jp/research/669/"><H2 class="article-title">Breaking symmetry in the strong force</H2></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.rikenresearch.riken.jp/research/669/"><DIV>An international research team has reconciled two theories that explain the properties of the pion. The work is important because this subatomic particle plays a key role in the strong interaction—the fundamental force that holds atomic nuclei together.</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.rikenresearch.riken.jp/research/669/"><DIV>
The pion consists of a quark and an anti-quark, meaning it is classified as a hadron alongside protons and neutrons—but it has very different properties.</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.rikenresearch.riken.jp/research/669/"><DIV>
“One puzzle was that the pion is much lighter than other hadrons,” says scientist Sinya Aoki, based at the University of Tsukuba and the RIKEN BNL Center in New York.</DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.rikenresearch.riken.jp/research/669/"><DIV>
The unexpectedly light pion mass was first explained by Yoichiro Nambu, who received the Nobel Prize for Physics in 2008. He realized that the strong interaction usually obeys a rule called ‘chiral symmetry’, but in a vacuum this rule can be broken. </DIV></blockquote><div style="height: 2px; font-size: 2px; background: #dcdcdc; border-bottom: solid 1px #f5f5f5; margin: 2px 4px;"></div><blockquote style="text-align: left; padding: 0px 8px; margin: 4px 0px 8px 0px; background: transparent; border: none;" cite="http://www.rikenresearch.riken.jp/research/669/"><DIV>
In fact, pions have a tiny mass due to the small but non-zero quark mass, irrespective of the large energy scale of the strong interaction.</DIV></blockquote></div><div style="margin: 0px 6px 6px 4px;"><table style="font-size: 11px;border-spacing: 0px;padding: 0px;" cellpadding="0" cellspacing="0" width="100%"><tr><td style="background:transparent;border-width:0px;padding:0px;">&nbsp;</td><td align="right" style="background:transparent;border-width:0px;padding:0px;width:107px" width="107"><a href="http://clipmarks.com/share/90EDB5CC-4493-4491-8E61-D29A9F78DD17/blog/" title="blog or email this clip"><img src="http://content8.clipmarks.com/images/c2b-foot.png" border="0" alt="blog it" width="107" height="17" style="border-width:0px;padding:0px;margin:0px;" /></a></td></tr></table></div></div>

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