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Theory Center Seminar<br>
Mon., Dec. 3, 2012<br>
1:00 p.m. (coffee at 12:45 p.m.)<br>
CEBAF Center, Room L104<br>
<br>
<span lang="EN-GB"></span> Vicent Mateu Barreda<br>
MIT<br>
<br>
<b>Hadron Mass Effects to Event Shape Power Corrections</b><br>
<br>
In my talk I will address the issue of mass effects on power
correction to event shape<br>
distributions. In particular, I will define an operator that
describes the effect of hadron<br>
masses on the leading 1/Q power correction. Here, Q is the scale of
the hard collision. <br>
Despite the fact that different event shapes have different hadron
mass dependence, <br>
we provide a simple method to identify universality classes of event
shapes whose <br>
power corrections depend on a common non-perturbative parameter. We
compute<br>
the anomalous dimension of the transverse velocity operator which
causes the power<br>
correction to exhibit non-trivial dependence on Q.
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