Refine
Year of publication
- 2016 (101) (remove)
Language
- English (101)
Has Fulltext
- yes (101)
Is part of the Bibliography
- no (101)
Keywords
- Centrality Class (1)
- Centrality Selection (1)
- Invariant Mass Distribution (1)
- Minimum Bias (1)
- Monte Carlo (1)
- Production Cross Section (1)
- Rapidity Range (1)
- Resolution Parameter (1)
- Systematic Uncertainty (1)
- Time Projection Chamber (1)
Institute
- Physik (101) (remove)
We have has 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<y<0.9 is dσcohψ(2S)/dy=0.83±0.19(stat+syst) mb. The ψ(2S) to J/ψ coherent cross section ratio is 0.34+0.08−0.07(stat+syst). The obtained results are compared to predictions from theoretical models.