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	<title>Comments on: Particle physics marches on</title>
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	<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/</link>
	<description>Random samplings from a universe of ideas.</description>
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		<title>By: Small Things Considered &#124; Cosmic Variance</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14126</link>
		<dc:creator>Small Things Considered &#124; Cosmic Variance</dc:creator>
		<pubDate>Thu, 04 May 2006 06:41:23 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14126</guid>
		<description>[...] See the MINOS website for more information. Sean did a post about it here. I thought that the radio segment was rather good, and informative for the non-physicist. Have a listen. You can look at lots of information and other links on the NPR site, and click the &#8220;listen&#8221; button for the radio piece. I very much like the tongue-in-cheek and rather self-aware editing in places. For example, when he&#8217;s talking about the neutrinos shooting down the beampipe (or some such action), there&#8217;s some realy corny special effects whizzing noises. Kestenbaum says, almost apologetically (as though he had an argument with a senior producer about putting this sound in, and lost), &#8220;That&#8217;s not the real sound&#8221; (but maybe there&#8217;s a hint of a smile in his voice, maybe?) [...]</description>
		<content:encoded><![CDATA[<p>[...] See the MINOS website for more information. Sean did a post about it here. I thought that the radio segment was rather good, and informative for the non-physicist. Have a listen. You can look at lots of information and other links on the NPR site, and click the &#8220;listen&#8221; button for the radio piece. I very much like the tongue-in-cheek and rather self-aware editing in places. For example, when he&#8217;s talking about the neutrinos shooting down the beampipe (or some such action), there&#8217;s some realy corny special effects whizzing noises. Kestenbaum says, almost apologetically (as though he had an argument with a senior producer about putting this sound in, and lost), &#8220;That&#8217;s not the real sound&#8221; (but maybe there&#8217;s a hint of a smile in his voice, maybe?) [...]</p>
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		<title>By: Experimental sociology &#124; Cosmic Variance</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14125</link>
		<dc:creator>Experimental sociology &#124; Cosmic Variance</dc:creator>
		<pubDate>Mon, 17 Apr 2006 15:10:08 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14125</guid>
		<description>[...] A little late, but I didn&#8217;t want to let slip this interesting discussion about the agonizing process of making experimental particle physics results ready for public consumption from Tomaso Dorrigo and Gordon Watts. You&#8217;ll recall that we mentioned a couple of weeks ago the new results from Fermilab&#8217;s Tevatron on B-mixing, a measurement that puts interesting new constraints on the possibilities for physics beyond the Standard Model. The first announcement was from the D0 (&#8221;D-Zero&#8221;) experiment; as Collin pointed out in the comments, the CDF experiment followed with their own results soon thereafter. [...]</description>
		<content:encoded><![CDATA[<p>[...] A little late, but I didn&#8217;t want to let slip this interesting discussion about the agonizing process of making experimental particle physics results ready for public consumption from Tomaso Dorrigo and Gordon Watts. You&#8217;ll recall that we mentioned a couple of weeks ago the new results from Fermilab&#8217;s Tevatron on B-mixing, a measurement that puts interesting new constraints on the possibilities for physics beyond the Standard Model. The first announcement was from the D0 (&#8221;D-Zero&#8221;) experiment; as Collin pointed out in the comments, the CDF experiment followed with their own results soon thereafter. [...]</p>
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		<title>By: JoAnne</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14124</link>
		<dc:creator>JoAnne</dc:creator>
		<pubDate>Wed, 12 Apr 2006 06:12:31 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14124</guid>
		<description>Thomas,  you make a good case and indeed many people have put all the constraints together and studied the supersymmetry parameter space in detail.  The result is that supersymmetry is very elusive, particularly if you consider the general theory and not the very constrained case of minimal supergravity mediated SUSY.  In the former (general SUSY), then no, there are no real constraints except for the kinematic limits from sparticle searches at colliders.  In constrained models, one sign of the Higgsino mixing parameter (mu) is disfavored if the sparticles are relatively light (</description>
		<content:encoded><![CDATA[<p>Thomas,  you make a good case and indeed many people have put all the constraints together and studied the supersymmetry parameter space in detail.  The result is that supersymmetry is very elusive, particularly if you consider the general theory and not the very constrained case of minimal supergravity mediated SUSY.  In the former (general SUSY), then no, there are no real constraints except for the kinematic limits from sparticle searches at colliders.  In constrained models, one sign of the Higgsino mixing parameter (mu) is disfavored if the sparticles are relatively light (</p>
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		<title>By: Thomas Larsson</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14123</link>
		<dc:creator>Thomas Larsson</dc:creator>
		<pubDate>Wed, 12 Apr 2006 06:03:55 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14123</guid>
		<description>Does anyone know how stringent constraints on SUSY are, if one takes all types of experiments into account? Wouldn&#039;t one expect to see several things, e.g.

1. Sparticles
2. Light Higgs
3. Muon g-2
4. Permanent electric dipole moment
5. Proton decay
6. WIMPS
7. B_s mixing
and perhaps others. AFAIU, none of these experiments can rule out SUSY by themselves, but taken together they should provide much stronger constraints than each of them taken separately, no?</description>
		<content:encoded><![CDATA[<p>Does anyone know how stringent constraints on SUSY are, if one takes all types of experiments into account? Wouldn&#8217;t one expect to see several things, e.g.</p>
<p>1. Sparticles<br />
2. Light Higgs<br />
3. Muon g-2<br />
4. Permanent electric dipole moment<br />
5. Proton decay<br />
6. WIMPS<br />
7. B_s mixing<br />
and perhaps others. AFAIU, none of these experiments can rule out SUSY by themselves, but taken together they should provide much stronger constraints than each of them taken separately, no?</p>
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		<title>By: JoAnne</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14122</link>
		<dc:creator>JoAnne</dc:creator>
		<pubDate>Tue, 11 Apr 2006 05:19:10 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14122</guid>
		<description>The Tevatron results on B_s mixing are smack dab in the middle of the Standard Model expectations, factoring in the remainer of the B-physics results.  Quite disappointing, actually - us theorists were hoping for a much larger number!.

Nonetheless, there is significant play in the overall prediction due to uncertainties in theoretical quantities such as the B meson decay constant and bag factor.  Due to this, I don&#039;t see where this result will place any significant constraints on supersymmetry.  Sorry, wish it were different myself.  However, there are a few wilder theories that predicted maximal B_S mixing that will now be excluded.</description>
		<content:encoded><![CDATA[<p>The Tevatron results on B_s mixing are smack dab in the middle of the Standard Model expectations, factoring in the remainer of the B-physics results.  Quite disappointing, actually &#8211; us theorists were hoping for a much larger number!.</p>
<p>Nonetheless, there is significant play in the overall prediction due to uncertainties in theoretical quantities such as the B meson decay constant and bag factor.  Due to this, I don&#8217;t see where this result will place any significant constraints on supersymmetry.  Sorry, wish it were different myself.  However, there are a few wilder theories that predicted maximal B_S mixing that will now be excluded.</p>
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		<title>By: Collin</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14121</link>
		<dc:creator>Collin</dc:creator>
		<pubDate>Tue, 11 Apr 2006 05:00:50 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14121</guid>
		<description>I&#039;m not exactly qualified to say anything about constraints on SUSY, though I&#039;d be thrilled if someone (JoAnne?) would chime in with that. I&#039;d also like to hear what this does for the Unitarity Triangle. Along with this measurement, CDF reported a measurement of &#124;V_td&#124;/&#124;V_ts&#124; = 0.208 +/- 0.008, a pretty significant increase in the precision of this quantity. Specifically, does this measurement improve the constraints on rho?

As for a comparison with the D0 result, it&#039;s certainly consistant. But, the CDF result is much nicer, if a bit later. In their amplitude scan (basically, you scan a range of possible Delta(m_s) values, fit the oscillation data and measure a mixing amplitude; this should be 1 at the true value of Delta(m_s) and 0 otherwise), D0 found a 5 ps^-1 window where the data were inconsistant with 0 at a 90% CL. In comparison, CDF actually measured Delta(m_s) to better than +/- .5 ps^-1. If you wanted to put it in a 90% CL range to compare directly with D0, it&#039;d be less than 1 ps^-1 and contained entirely within D0&#039;s range, though certainly on the low side.</description>
		<content:encoded><![CDATA[<p>I&#8217;m not exactly qualified to say anything about constraints on SUSY, though I&#8217;d be thrilled if someone (JoAnne?) would chime in with that. I&#8217;d also like to hear what this does for the Unitarity Triangle. Along with this measurement, CDF reported a measurement of |V_td|/|V_ts| = 0.208 +/- 0.008, a pretty significant increase in the precision of this quantity. Specifically, does this measurement improve the constraints on rho?</p>
<p>As for a comparison with the D0 result, it&#8217;s certainly consistant. But, the CDF result is much nicer, if a bit later. In their amplitude scan (basically, you scan a range of possible Delta(m_s) values, fit the oscillation data and measure a mixing amplitude; this should be 1 at the true value of Delta(m_s) and 0 otherwise), D0 found a 5 ps^-1 window where the data were inconsistant with 0 at a 90% CL. In comparison, CDF actually measured Delta(m_s) to better than +/- .5 ps^-1. If you wanted to put it in a 90% CL range to compare directly with D0, it&#8217;d be less than 1 ps^-1 and contained entirely within D0&#8242;s range, though certainly on the low side.</p>
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		<title>By: JoAnne</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14120</link>
		<dc:creator>JoAnne</dc:creator>
		<pubDate>Tue, 11 Apr 2006 04:44:15 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14120</guid>
		<description>Ah, Collin - the importance of competition between 2 experiments!  We have been waiting - for &lt;em&gt;years&lt;/em&gt; - for this result which CDF in particular had promised very early on.  Now that D0 announced it first, it seems that CDF suddenly is ready to go public too.  I recall attending a talk, just last Fall, where CDF stated it would be awhile before they could measure B_s mixing, while D0 kept silent on the matter....</description>
		<content:encoded><![CDATA[<p>Ah, Collin &#8211; the importance of competition between 2 experiments!  We have been waiting &#8211; for <em>years</em> &#8211; for this result which CDF in particular had promised very early on.  Now that D0 announced it first, it seems that CDF suddenly is ready to go public too.  I recall attending a talk, just last Fall, where CDF stated it would be awhile before they could measure B_s mixing, while D0 kept silent on the matter&#8230;.</p>
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		<title>By: Sean</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14119</link>
		<dc:creator>Sean</dc:creator>
		<pubDate>Tue, 11 Apr 2006 04:33:16 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14119</guid>
		<description>Collin, thanks for the update -- I had heard that the CDF results were imminent.  So what does that mean in comparison with the D0 results, and constraints on susy?</description>
		<content:encoded><![CDATA[<p>Collin, thanks for the update &#8212; I had heard that the CDF results were imminent.  So what does that mean in comparison with the D0 results, and constraints on susy?</p>
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		<title>By: Collin</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14118</link>
		<dc:creator>Collin</dc:creator>
		<pubDate>Tue, 11 Apr 2006 02:37:04 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14118</guid>
		<description>I just thought I&#039;d let everyone know that at today&#039;s Wine &amp; Cheese seminar at Fermilab, CDF announced a measurement of Delta(m_s) in the B_s system of 17.33 with an error of about 2.5%.</description>
		<content:encoded><![CDATA[<p>I just thought I&#8217;d let everyone know that at today&#8217;s Wine &amp; Cheese seminar at Fermilab, CDF announced a measurement of Delta(m_s) in the B_s system of 17.33 with an error of about 2.5%.</p>
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		<title>By: Cyberspace Rendezvous :: Particle physics marches on :: April :: 2006</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14117</link>
		<dc:creator>Cyberspace Rendezvous :: Particle physics marches on :: April :: 2006</dc:creator>
		<pubDate>Fri, 07 Apr 2006 00:18:58 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14117</guid>
		<description>[...] For all you physics geeks out there: the group physicist blog Cosmic Variance talks about particle physics: Yesterday the MINOS experiment at Fermilab (Main Injector Neutrino Oscillation Search) released their first results. (More from Andrew Jaffe.) This is one of those fun experiments that shoots neutrinos from a particle accelerator onto an underground journey, to be detected in a facility hundreds of miles away â€&quot; in this case, the Soudan mine in Minnesota. They confirm the existence of neutrino oscillations, with a difference in mass between the two neutrino states of Î&quot;m2 = 0.0031 eV2. The neutrinos left Fermilab as muon neutrinos&#8230; [...]</description>
		<content:encoded><![CDATA[<p>[...] For all you physics geeks out there: the group physicist blog Cosmic Variance talks about particle physics: Yesterday the MINOS experiment at Fermilab (Main Injector Neutrino Oscillation Search) released their first results. (More from Andrew Jaffe.) This is one of those fun experiments that shoots neutrinos from a particle accelerator onto an underground journey, to be detected in a facility hundreds of miles away â€&#8221; in this case, the Soudan mine in Minnesota. They confirm the existence of neutrino oscillations, with a difference in mass between the two neutrino states of Î&#8221;m2 = 0.0031 eV2. The neutrinos left Fermilab as muon neutrinos&#8230; [...]</p>
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		<title>By: Random Thoughts &#124; Cosmic Variance</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14092</link>
		<dc:creator>Random Thoughts &#124; Cosmic Variance</dc:creator>
		<pubDate>Wed, 05 Apr 2006 10:14:27 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14092</guid>
		<description>[...] I was away for 3 weeks and all sorts of things happened physics-wise. Things like that never happen while I&#8217;m home scouring the news! Mixing of what we call the B_sub_s meson was discovered. I&#8217;ve been waiting for that result for , well, 20 years!!! And now that the result is in, it&#8217;s anti-climatic since the measured value is exactly what the Standard Model of particle physics predicts. yawn&#8230;. But, then there&#8217;s the supposed axion discovery. Now, that&#8217;s potentially exciting!!! I know little about the experiment, but asked a colleague today for his opinion - he didn&#8217;t have a good answer, so I have to talk to Helen Quinn tomorrow. She&#8217;ll know. [...]</description>
		<content:encoded><![CDATA[<p>[...] I was away for 3 weeks and all sorts of things happened physics-wise. Things like that never happen while I&#8217;m home scouring the news! Mixing of what we call the B_sub_s meson was discovered. I&#8217;ve been waiting for that result for , well, 20 years!!! And now that the result is in, it&#8217;s anti-climatic since the measured value is exactly what the Standard Model of particle physics predicts. yawn&#8230;. But, then there&#8217;s the supposed axion discovery. Now, that&#8217;s potentially exciting!!! I know little about the experiment, but asked a colleague today for his opinion &#8211; he didn&#8217;t have a good answer, so I have to talk to Helen Quinn tomorrow. She&#8217;ll know. [...]</p>
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		<title>By: Plato</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14116</link>
		<dc:creator>Plato</dc:creator>
		<pubDate>Tue, 04 Apr 2006 00:19:52 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14116</guid>
		<description>I should say, when you click on name that you go to the bottom of the article and see the images in relation to the statement above. It should make sense then.

More details, the less humour? I hope not:)</description>
		<content:encoded><![CDATA[<p>I should say, when you click on name that you go to the bottom of the article and see the images in relation to the statement above. It should make sense then.</p>
<p>More details, the less humour? I hope not:)</p>
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		<title>By: Plato</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14115</link>
		<dc:creator>Plato</dc:creator>
		<pubDate>Tue, 04 Apr 2006 00:09:55 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14115</guid>
		<description>The Devil&lt;/a&gt; is in the details, while the true cast&lt;/a&gt;, is &lt;a href=&quot;http://lhc.web.cern.ch/lhc/Default.htm&quot; rel=&quot;nofollow&quot;&gt;here?&lt;/a&gt;

:)More on name</description>
		<content:encoded><![CDATA[<p>The Devil is in the details, while the true cast, is <a href="http://lhc.web.cern.ch/lhc/Default.htm" rel="nofollow">here?</a><br />
 <img src='http://blogs.discovermagazine.com/cosmicvariance/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> More on name</p>
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		<title>By: Count Iblis</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14114</link>
		<dc:creator>Count Iblis</dc:creator>
		<pubDate>Tue, 04 Apr 2006 00:00:19 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14114</guid>
		<description>Yes :) &#039;&#039;direct detection&#039;&#039; is perhaps a better description than &#039;&#039;observation&#039;&#039;.</description>
		<content:encoded><![CDATA[<p>Yes <img src='http://blogs.discovermagazine.com/cosmicvariance/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' />  &#8221;direct detection&#8221; is perhaps a better description than &#8221;observation&#8221;.</p>
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		<title>By: Sean</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14113</link>
		<dc:creator>Sean</dc:creator>
		<pubDate>Mon, 03 Apr 2006 17:13:13 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14113</guid>
		<description>I think that dark matter, dark energy, and the baryon asymmetry are rather stronger pieces of evidence for physics beyond the standard model.  (I will refrain from being a smartass and mentioning &quot;gravity.&quot;)</description>
		<content:encoded><![CDATA[<p>I think that dark matter, dark energy, and the baryon asymmetry are rather stronger pieces of evidence for physics beyond the standard model.  (I will refrain from being a smartass and mentioning &#8220;gravity.&#8221;)</p>
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		<title>By: Count Iblis</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14090</link>
		<dc:creator>Count Iblis</dc:creator>
		<pubDate>Mon, 03 Apr 2006 16:26:22 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14090</guid>
		<description>So, the Italians lead the world with their two claimed observations of physics beyond the standard model so far: DAMA and PVLAS  :)</description>
		<content:encoded><![CDATA[<p>So, the Italians lead the world with their two claimed observations of physics beyond the standard model so far: DAMA and PVLAS  <img src='http://blogs.discovermagazine.com/cosmicvariance/wp-includes/images/smilies/icon_smile.gif' alt=':)' class='wp-smiley' /> </p>
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		<title>By: Dumb Biologist</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14091</link>
		<dc:creator>Dumb Biologist</dc:creator>
		<pubDate>Mon, 03 Apr 2006 16:02:41 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14091</guid>
		<description>Thanks for a neat discussion!</description>
		<content:encoded><![CDATA[<p>Thanks for a neat discussion!</p>
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		<title>By: Alejandro Rivero</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14112</link>
		<dc:creator>Alejandro Rivero</dc:creator>
		<pubDate>Mon, 03 Apr 2006 15:23:05 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14112</guid>
		<description>Other possibility is that susy is cleverly hidden, and it is not at the electroweak but at the strong/chiral scales. I told about this at hep-ph/0512065; you need to build diquarks antsymmetrising SU(3) color and symmetrizing &quot;SU(5)&quot; flavour, where the quotes in &quot;SU(5)&quot; tell us that we need consider isospin and hypercharge so that 4/3 diquarks are excluded and that it is not SU(6), ie it does not contain the top quark, whose role is different. With these rules you get the scalars you need to cancel hierarchy; you only need a clever coupling with the higss sector so that they get the same mass that single quarks.

As for how the top quark is different, in addition to the usual argument that it is so massive that it disintegrates before pairing into a meson, let me note that the last measure of its yukawa coupling is still one sigma compatible with unity: From http://arxiv.org/abs/hep-ex/0603039 we have 0.991 \pm 0.013</description>
		<content:encoded><![CDATA[<p>Other possibility is that susy is cleverly hidden, and it is not at the electroweak but at the strong/chiral scales. I told about this at hep-ph/0512065; you need to build diquarks antsymmetrising SU(3) color and symmetrizing &#8220;SU(5)&#8221; flavour, where the quotes in &#8220;SU(5)&#8221; tell us that we need consider isospin and hypercharge so that 4/3 diquarks are excluded and that it is not SU(6), ie it does not contain the top quark, whose role is different. With these rules you get the scalars you need to cancel hierarchy; you only need a clever coupling with the higss sector so that they get the same mass that single quarks.</p>
<p>As for how the top quark is different, in addition to the usual argument that it is so massive that it disintegrates before pairing into a meson, let me note that the last measure of its yukawa coupling is still one sigma compatible with unity: From <a href="http://arxiv.org/abs/hep-ex/0603039" rel="nofollow">http://arxiv.org/abs/hep-ex/0603039</a> we have 0.991 \pm 0.013</p>
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		<title>By: Tony Smith</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14111</link>
		<dc:creator>Tony Smith</dc:creator>
		<pubDate>Mon, 03 Apr 2006 13:16:39 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14111</guid>
		<description>Sean said (in section 2. of this blog entry) &quot;... the D0 experiment ... released new results on the oscillations of ... the Bs meson ... as reported in ...[ hep-ex/0603029 ]... the results are splendidly consistent with the predictions of the minimal Standard Model. ... susy could already have easily been detected if it is there at the electroweak scale, but it hasn&#039;t been seen yet. Either it&#039;s cleverly hiding, or there is no susy at the weak scale - which would come as a surprise (a disappointing one) to many people. ...&quot;.

Various comments in another blog entry by Sean (about grad school) said:
(Belizean) &quot;... prospective grad students should ask themselves this question, &quot;Do I have a burning desire to be a physics professor, or merely a deep interest in physics?&quot; If the latter, I would recommend skipping graduate school, investing your time and energy in becoming financially independent, and studying physics as a leisure pursuit. ...&quot;.
(A Serious Question) &quot;... It seems much more likely to me for a bright person who goes down this path to come up with truly creative and groundbreaking physics, then it is for somebody who enters the modern &quot;publish-or-publish&quot; world of modern grad students and postdocs. ...&quot;.
(Anonymous Beaver) &quot;... You shouldn&#039;t do it because you&#039;ll become a crackpot and nobody will pay any attention to you. ... In the unlikely event you do discover some great insight, you&#039;ll have incredible difficulty communicating it to people besides your long-suffering colleagues. ...&quot;.
(Ambitwistor) &quot;... forgoing an advanced degree and going into academic seclusion without regular contact with one&#039;s peers is a route to crankdom ...&quot;.
(Ponderer of Things) &quot;... for incoming graduate students NOT to pick their school based on prestige is a recipee for post-PhD career suicide ...&quot;.

Even if Chad Orzel finds it offensive, the very existence of the buzz-phrase

&quot;physics is subdivided into &quot;string theory&quot; and &quot;stamp collecting&quot;&quot;

indicates that theoretical physics in &quot;prestige&quot; schools is dominated by conventional &quot;string theory&quot; which is founded on the existence of &quot;susy&quot; supersymmtry. If that is the case,
then
is it really very likely that anyone following the grad school career advice will be able to construct a physics model consistent with experiment, i.e.,
a physics model either without susy or with it very &quot;cleverly hiding&quot; in some unconventional way ?

I do agree that the above-stated grad school career advice is accurate advice for someone wanting a tenured professorship at a &quot;good&quot; school.
However,
it seems to me that, in times in which the dominant fashion in theory may not consistent with experimental results, the way to advance a &quot;career&quot; may not be the way to advance the &quot;onward march of particle physics&quot;.

Tony Smith
http://www.valdostamuseum.org/hamsmith/</description>
		<content:encoded><![CDATA[<p>Sean said (in section 2. of this blog entry) &#8220;&#8230; the D0 experiment &#8230; released new results on the oscillations of &#8230; the Bs meson &#8230; as reported in &#8230;[ hep-ex/0603029 ]&#8230; the results are splendidly consistent with the predictions of the minimal Standard Model. &#8230; susy could already have easily been detected if it is there at the electroweak scale, but it hasn&#8217;t been seen yet. Either it&#8217;s cleverly hiding, or there is no susy at the weak scale &#8211; which would come as a surprise (a disappointing one) to many people. &#8230;&#8221;.</p>
<p>Various comments in another blog entry by Sean (about grad school) said:<br />
(Belizean) &#8220;&#8230; prospective grad students should ask themselves this question, &#8220;Do I have a burning desire to be a physics professor, or merely a deep interest in physics?&#8221; If the latter, I would recommend skipping graduate school, investing your time and energy in becoming financially independent, and studying physics as a leisure pursuit. &#8230;&#8221;.<br />
(A Serious Question) &#8220;&#8230; It seems much more likely to me for a bright person who goes down this path to come up with truly creative and groundbreaking physics, then it is for somebody who enters the modern &#8220;publish-or-publish&#8221; world of modern grad students and postdocs. &#8230;&#8221;.<br />
(Anonymous Beaver) &#8220;&#8230; You shouldn&#8217;t do it because you&#8217;ll become a crackpot and nobody will pay any attention to you. &#8230; In the unlikely event you do discover some great insight, you&#8217;ll have incredible difficulty communicating it to people besides your long-suffering colleagues. &#8230;&#8221;.<br />
(Ambitwistor) &#8220;&#8230; forgoing an advanced degree and going into academic seclusion without regular contact with one&#8217;s peers is a route to crankdom &#8230;&#8221;.<br />
(Ponderer of Things) &#8220;&#8230; for incoming graduate students NOT to pick their school based on prestige is a recipee for post-PhD career suicide &#8230;&#8221;.</p>
<p>Even if Chad Orzel finds it offensive, the very existence of the buzz-phrase</p>
<p>&#8220;physics is subdivided into &#8220;string theory&#8221; and &#8220;stamp collecting&#8221;"</p>
<p>indicates that theoretical physics in &#8220;prestige&#8221; schools is dominated by conventional &#8220;string theory&#8221; which is founded on the existence of &#8220;susy&#8221; supersymmtry. If that is the case,<br />
then<br />
is it really very likely that anyone following the grad school career advice will be able to construct a physics model consistent with experiment, i.e.,<br />
a physics model either without susy or with it very &#8220;cleverly hiding&#8221; in some unconventional way ?</p>
<p>I do agree that the above-stated grad school career advice is accurate advice for someone wanting a tenured professorship at a &#8220;good&#8221; school.<br />
However,<br />
it seems to me that, in times in which the dominant fashion in theory may not consistent with experimental results, the way to advance a &#8220;career&#8221; may not be the way to advance the &#8220;onward march of particle physics&#8221;.</p>
<p>Tony Smith<br />
<a href="http://www.valdostamuseum.org/hamsmith/" rel="nofollow">http://www.valdostamuseum.org/hamsmith/</a></p>
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		<title>By: Plato</title>
		<link>http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/comment-page-1/#comment-14110</link>
		<dc:creator>Plato</dc:creator>
		<pubDate>Mon, 03 Apr 2006 07:07:48 +0000</pubDate>
		<guid isPermaLink="false">http://blogs.discovermagazine.com/cosmicvariance/2006/03/31/particle-physics-marches-on/#comment-14110</guid>
		<description>One had to break free of &quot;the rigidity&quot; with which language might have been seen, while &quot;WMAP polarization maps&quot; might been seen in analogistical ways?

Maybe, it&#039;s taken further, in Dirac&#039;s geometrical thinking?</description>
		<content:encoded><![CDATA[<p>One had to break free of &#8220;the rigidity&#8221; with which language might have been seen, while &#8220;WMAP polarization maps&#8221; might been seen in analogistical ways?</p>
<p>Maybe, it&#8217;s taken further, in Dirac&#8217;s geometrical thinking?</p>
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