Coherent ρ$^{0}$ photoproduction in ultra-peripheral Pb-Pb collisions at $ \sqrt{s_{\mathrm{NN}}}=2.76 $ TeV

Adam, Jaroslav; Adamova, Dagmar; Aggarwal, Madan Mohan; Aglieri Rinella, Gianluca; Agnello, Michelangelo; Agrawal, Neelima; Ahammed, Zubayer; Ahn, Sang Un; Aimo, Ilaria; Aiola, Salvatore

doi:10.1007/JHEP09(2015)095

Coherent ρ $^{0}$ photoproduction in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV

ALICE

Collaboration

Mar 31, 2015

23 pages

Published in:

JHEP 09 (2015) 095

Published: Sep 15, 2015

e-Print:

1503.09177 [nucl-ex]

DOI:

10.1007/JHEP09(2015)095

Report number:

CERN-PH-EP-2015-082

Experiments:

CERN-LHC-ALICE

View in:

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Abstract: (Springer)

We report the first measurement at the LHC of coherent photoproduction of ρ

^{0}

mesons in ultra-peripheral Pb-Pb collisions. The invariant mass and transverse momentum distributions for ρ

^{0}

production are studied in the π

^{+}

π

^{−}

decay channel at mid-rapidity. The production cross section in the rapidity range |y| < 0.5 is found to be dσ/dy = 425 ± 10(stat.)

_{− 50}^{+ 42}

(sys.) mb. Coherent ρ

^{0}

production is studied with and without requirement of nuclear breakup, and the fractional yields for various breakup scenarios are presented. The results are compared with those from lower energies and with model predictions.

Note:

23 pages, 6 captioned figures, 2 tables, authors from page 18, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1561

Hadron-Hadron Scattering
model: Glauber
heavy ion: scattering
cross section: measured
model: dipole
transverse momentum: momentum spectrum
nucleus: fragmentation
color: dipole
nucleus nucleus: coherent interaction
rho(770): photoproduction

References(37)

Figures(0)

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Coherent ρ0^{0}0 photoproduction in ultra-peripheral Pb-Pb collisions at sNN=2.76 \sqrt{s_{\mathrm{NN}}}=2.76 sNN​​=2.76 TeV

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Coherent ρ $^{0}$ photoproduction in ultra-peripheral Pb-Pb collisions at $\sqrt{s_{\mathrm{NN}}}=2.76$ TeV