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

Abstract : We have has performed the first measurement of the coherent $\psi$(2S) photo-production cross section in ultra-peripheral Pb-Pb collisions at the LHC. This charmonium excited state is reconstructed via the $\psi$(2S) $\rightarrow l^{+}l^{-}$ and $\psi$(2S) $\rightarrow$ J/$\psi \pi^{+}\pi^{-}$ decays, where the J/$\psi$ decays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22 $\mu\rm{b}^{-1}$. The cross section for coherent $\psi$(2S) production in the rapidity interval $-0.9
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Submitted on : Wednesday, August 26, 2015 - 2:16:05 PM
Last modification on : Wednesday, October 30, 2019 - 1:44:54 AM

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J. Adam, Laurent Aphecetche, A. Baldisseri, Guillaume Batigne, I. Belikov, et al.. Coherent $\psi$(2S) photo-production in ultra-peripheral Pb-Pb collisions at $\sqrt{s}_{\rm NN}$ = 2.76 TeV. Physics Letters B, Elsevier, 2015, 751, pp.358-370. ⟨10.1016/j.physletb.2015.10.040⟩. ⟨in2p3-01187258⟩

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