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<tt>Theory Center Seminar<br>
Wed., March 21, 2012<br>
CEBAF Center, Room L104<br>
2:00 p.m. (coffee at 1:45 p.m.)<br>
<br>
<br>
Thomas Cohen<br>
University of Maryland</tt><br>
<pre wrap=""><tt><b>The Hagedorn Spectrum: Theory and Practice</b>
<span class="moz-txt-citetags"></span>
<span class="moz-txt-citetags"></span>Does QCD have a Hagedorn spectrum? That is, does the <span
class="moz-txt-citetags"></span>number
of hadrons grow exponentially with mass for asymptotically
<span class="moz-txt-citetags"></span>high mass?
<span class="moz-txt-citetags"></span>
<span class="moz-txt-citetags"></span>This talk addresses the question from both an experimental and
<span class="moz-txt-citetags"></span>theoretical perspective. First, it is shown that while the data appear
<span class="moz-txt-citetags"></span>to be consistent with the Hagedorn conjecture, there is <span
class="moz-txt-citetags"></span>surprisingly
little strong evidence for it. The second part of the <span
class="moz-txt-citetags"></span>talk deals with
a theoretical viewpoint; in particular, we present <span
class="moz-txt-citetags"></span>an argument that
the large N_c limit of QCD naturally have a <span
class="moz-txt-citetags"></span>Hagedorn spectrum, provided
that certain technical assumptions are <span class="moz-txt-citetags"></span>met.</tt></pre>
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