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<font color="#000099"><b><font color="#3333ff">Physics Seminar<br>
Friday, Jan. 28, 2011<br>
11:00AM<br>
CEBAF Center AUD.<br>
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</font></b></font><b><font color="#cc0000">Arafat Gabareen Mokhtar
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Stanford Linear Accelerator Center</font>
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"Charmonium-like States at the B Factories"</b>
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Many charmonium-like states above the DD threshold have been discovered
at the B factories, BABAR and Belle. These states are produced in B
decays, initial state radiation, two-photon production, or in double
charmonium productions. The nature of these states still not yet been
completely understood, and in some cases results are not always
consistent. Among the new charmonium-like states, the Z(4430)-,
Z1(4050)-, and Z2(4250)- states, reported by the Belle Collaboration,
have generated a great deal of interest, because such states must have
minimum quark content of ccdu, i.e. these are four-quark states.
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An overview on new charmonium-like states that have been reported by
the
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BABAR and Belle Collaborations will be given.<br>
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