RT Journal Article
T1 Coherent ψ(2S) photo-production in ultra-peripheral Pb–Pb collisions at √sNN=2.76 TeV
A1 ALICE Collaboration, 
A1 Armesto Pérez, Néstor
A1 González Ferreiro, Elena
A1 Pajares Vales, Carlos
A1 Salgado López, Carlos Alberto
AB 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/ψdecays into two leptons. The analysis is based on an event sample corresponding to an integrated luminosity of about 22μb−1. The cross section for coherent ψ(2S)production in the rapidity interval −0.9 <y <0.9is dσcohψ(2S)/dy =0.83 ±0.19 stat+syst mb. The ψ(2S)to J/ψcoherent cross section ratio is 0.34+0.08−0.07(stat+syst). The obtained results are compared to predictions from theoretical models.
PB Elsevier
SN 0370-2693
YR 2015
FD 2015
LK http://hdl.handle.net/10347/21980
UL http://hdl.handle.net/10347/21980
LA eng
NO Adam, J., Adamová, D., Aggarwal, M. M., Rinella, G. A., Agnello, M., Agrawal, N., ... & Ajaz, M. (2015). Coherent ψ (2S) photo-production in ultra-peripheral PbPb collisions at √sNN= 2.76 TeV. Physics Letters B, 751, 358-370
DS Minerva
RD 25 abr 2026