Coherent photoproduction of $\rho^{0}$ vector mesons in ultra-peripheral Pb-Pb collisions at $ \sqrt{{\mathrm{s}}_{\mathrm{NN}}} $ = 5.02 TeV - INSPIRE

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Coherent photoproduction of $\rho^{0}$ vector mesons in ultra-peripheral Pb-Pb collisions at $\sqrt{{\mathrm{s}}_{\mathrm{NN}}}$ = 5.02 TeV

ALICE

Collaboration

Feb 25, 2020

24 pages

Published in:

JHEP 06 (2020) 035

Published: Jun 4, 2020

e-Print:

2002.10897 [nucl-ex]

DOI:

10.1007/JHEP06(2020)035

Report number:

CERN-EP-2020-021

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

Cross sections for the coherent photoproduction of ρ

^{0}

vector mesons in ultra-peripheral Pb-Pb collisions at

\sqrt{{\mathrm{s}}_{\mathrm{NN}}}

= 5.02 TeV are reported. The measurements, which rely on the π

^{+}

π

^{−}

decay channel, are presented in three regions of rapidity covering the range |y| < 0.8. For each rapidity interval, cross sections are shown for different nuclear-breakup classes defined according to the presence of neutrons measured in the zero-degree calorimeters. The results are compared with predictions based on different models of nuclear shadowing. Finally, the observation of a coherently produced resonance-like structure with a mass around 1.7 GeV/c

^{2}

and a width of about 140 MeV/c

^{2}

is reported and compared with similar observations from other experiments.[graphic not available: see fulltext]

Note:

24 pages, 5 captioned figures, 4 tables, authors from page 19, published version, figures at http://alice-publications.web.cern.ch/node/6147

Heavy Ion Experiments
Heavy-ion collision
Particle and resonance production
rho(770)0: photoproduction
heavy ion: scattering
nucleus: shadowing
calorimeter: forward spectrometer
vector meson
coherence
rapidity

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