Study of the transition form factor

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• 作者：Simone Pacetti
• 关键词：Electromagnetic form factors ; Dispersion relations ; Meson spectroscopy
• 刊名：Nuclear Physics A
• 出版年：2 December, 2013
• 年：2013
• 卷：919
• 期：Complete
• 页码：15-31
• 全文大小：351 K

文摘

In 2008 the BaBar Collaboration published new data on the cross section for the annihilation , obtained using the initial state radiation technique at a center of mass energy of 10.6 GeV.

Such a process represents an interesting test bed for the quark model. Indeed, since the production via annihilation proceeds through a mechanism which violates the Okubo-Zweig-Iizuka rule, the corresponding cross section could be characterized by contributions from non- bound states, like hybrids or tetraquarks. However the nature of such possible non-standard contributions will be not investigated in the following.

The cross section is analyzed in connection with other data coming from different processes, that involve the same mesons, using a method which implements the analyticity in the transition form factor by means of a dispersion relation procedure.