A new mechanism for the electromagnetic transition γ* N→N* (1535)

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AN Chun-Sheng and ZOU Bing-Song. A new mechanism for the electromagnetic transition γ* N→N* (1535)[J]. Chinese Physics C, 2010, 34(2): 245-248. doi: 10.1088/1674-1137/34/2/017
AN Chun-Sheng and ZOU Bing-Song. A new mechanism for the electromagnetic transition γ* N→N* (1535)[J]. Chinese Physics C, 2010, 34(2): 245-248.  doi: 10.1088/1674-1137/34/2/017 shu
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Received: 2009-08-27
Revised: 2009-09-15
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A new mechanism for the electromagnetic transition γ* N→N* (1535)

    Corresponding author: ZOU Bing-Song,

Abstract: 

The helicity amplitude Ap1/2 for the electromagnetic transition γ* N→N*(1535) is investigated. It is found that a new mechanism γ*→qq plays an important role in order to improve the description of this transition. On one hand, the Ap1/2 is decreased to fall in the data range at the photon point Q2=0, while on the other hand, the new mechanism makes the function Ap1/2(Q2) to decrease more slowly vs increasing Q2, as required by the data.

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