in p+pbar collisions at sqrt{s}
in p+pbar collisions at sqrt{s}
in p+pbar collisions at sqrt{s}
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The measured <strong>in</strong>variant mass<br />
• 28 unlike-sign pairs and no like-sign pairs of m ee > 2 GeV/c 2<br />
⇒ Clean sample, with zero net charge !<br />
• Invariant mass fit <strong>in</strong>put:<br />
• Coherent cont<strong>in</strong>uum shape derived from theoretical STARLIGHT-MC<br />
<strong>in</strong>put + full detector simul<strong>at</strong>ion and reconstruction<br />
dN/dm e+e- = A · exp( c m e+e- );<br />
γγ→e + e -<br />
γA(n)→J/ψ→e + e -<br />
Simul<strong>at</strong>ed<br />
STARLIGHT<br />
simul<strong>at</strong>ions +<br />
dectector<br />
simul<strong>at</strong>ion &<br />
reconstruction<br />
• J/ψ Gaussian fit shape ⇒ width 155 MeV/c 2 consistent with MC<br />
N(J/ψ) = 9.9 ± 4.1 (st<strong>at</strong>) ± 1.0 (syst)<br />
ISSP-Erice Mickey Chiu 8/ 16
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