Coherent $\psi$(2S) photo-production in ultra-peripheral Pb Pb collisions at $\sqrt{s}_{\rm NN}$ = 2.76 TeV - INSPIRE

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Coherent $\psi$ (2S) photo-production in ultra-peripheral Pb Pb collisions at $\sqrt{s}_{\rm NN}$ = 2.76 TeV

ALICE

Collaboration

Aug 20, 2015

13 pages

Published in:

Phys.Lett.B 751 (2015) 358-370

Published: Dec 17, 2015

e-Print:

1508.05076 [nucl-ex]

DOI:

10.1016/j.physletb.2015.10.040

Report number:

CERN-PH-EP-2015-156

Experiments:

CERN-LHC-ALICE

View in:

reference search66 citations

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Abstract: (Elsevier)

We have performed the first measurement of the coherent ψ(2S) photo-production cross section in ultra-peripheral Pb Pb collisions at the LHC. This charmonium excited state is reconstructed via the ψ(2S)→l+l− and ψ(2S)→J/ψπ+π− decays, where the J/ψ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 μb−1 . The cross section for coherent ψ(2S) production in the rapidity interval −0.9

Note:

22 pages, 5 captioned figures, 3 tables, authors from page 17, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/1854

psi(3685)
photoproduction
cross section: ratio
charmonium: excited state
coherence
decay
rapidity
small-x
vertex: primary
energy loss

References(40)

Figures(10)

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