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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Z 1 e<br />
A<br />
v~c<br />
A<br />
Z 2 e<br />
UPC A+A <strong>in</strong>teraction<br />
γ+γ and γ+A Lum<strong>in</strong>osities<br />
b > 2R<br />
RHIC, LHC L γA/L AA<br />
• The electromagnetic field is equivalent to a large flux of quasi-real photons, and<br />
can be calcul<strong>at</strong>ed per (Fermi)-Weizsacker-Williams:<br />
• Can get large flux due to the coherent effect of protons <strong>in</strong> nucleus (~Z 2 )<br />
• Two processes:<br />
1. photon-photon (coherent)<br />
2. photon-nucleon (<strong>in</strong>coherent,photoproduction)<br />
ISSP-Erice Mickey Chiu 4/ 16
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