Coherent diffractive photoproduction of $\rho^{0}$mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider - INSPIRE

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Coherent diffractive photoproduction of $\rho^{0}$ mesons on gold nuclei at 200 GeV/nucleon-pair at the Relativistic Heavy Ion Collider

STAR

Collaboration

Feb 24, 2017

12 pages

Published in:

Phys.Rev.C 96 (2017) 5, 054904

Published: Nov 13, 2017

e-Print:

1702.07705 [nucl-ex]

DOI:

10.1103/PhysRevC.96.054904

Experiments:

BNL-RHIC-STAR

View in:

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Abstract: (APS)

The STAR Collaboration reports on the photoproduction of

\pi^+\pi^-

pairs in gold-gold collisions at a center-of-mass energy of 200 GeV/nucleon-pair. These pion pairs are produced when a nearly-real photon emitted by one ion scatters from the other ion. We fit the

\pi^+\pi^-

invariant mass spectrum with a combination of

\rho

and

\omega

resonances and a direct

\pi^+\pi^-

continuum. This is the first observation of the

\omega

in ultra-peripheral collisions, and the first measurement of

\rho-\omega

interference at energies where photoproduction is dominated by Pomeron exchange. The

\omega

amplitude is consistent with the measured

\gamma p\rightarrow \omega p

cross section, a classical Glauber calculation and the

\omega\rightarrow\pi^+\pi^-

branching ratio. The

\omega

phase angle is similar to that observed at much lower energies, showing that the

\rho-\omega

phase difference does not depend significantly on photon energy. The

\rho^0

differential cross section

d\sigma/dt

exhibits a clear diffraction pattern, compatible with scattering from a gold nucleus, with 2 minima visible. The positions of the diffractive minima agree better with the predictions of a quantum Glauber calculation that does not include nuclear shadowing than with a calculation that does include shadowing.

Note:

24 pages with 9 figures

rho(770)0: photoproduction
diffraction
form factor: hadronic
coherence
gold: nucleus
photon: emission
energy dependence
pi: mass spectrum
pomeron: exchange
differential cross section

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