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in p+pbar collisions at sqrt{s}

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γγ→e + e -<br />

J/ψ transverse momentum distribution<br />

γA(n)→J/ψ→e + e -<br />

• The low pT J/ψ consistent with the<br />

Au nuclear form factor F<br />

dNee / dpT = A ·pT ·|F(pT )| 2<br />

⇒ coherent (γγ) J/ψ production<br />

• But there seems to be also an<br />

<strong>in</strong>coherent (γn) J/ψ component<br />

� H<strong>in</strong>ts of both coherent &<br />

<strong>in</strong>coherent J/ψ production<br />

ISSP-Erice Mickey Chiu 12 / 16

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