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  • Coherent ψ(2S) photo-produc...
    Aiola, S.; Altinpinar, S.; Anguelov, V.; Azmi, M. D.; Badalà, A.; Bala, R.; Barbera, R.; Bastid, N.; Batyunya, B.; Behera, N. K.; Betev, L.; Boldizsár, L.; Botje, M.; Bregant, M.; Cai, X.; Calero Diaz, L.; Cavicchioli, C.; Cepila, J.; Choi, K.; Chojnacki, M.; Christakoglou, P.; Colamaria, F.; Cortese, P.; Das, I.; Das, S.; De Marco, N.; Divià, R.; Dubla, A.; Ducroux, L.; Eschweiler, D.; Eyyubova, G.; Fabbietti, L.; Feliciello, A.; Fernández Téllez, A.; Filchagin, S.; Fionda, F. M.; Fiore, E. M.; Fusco Girard, M.; Guerzoni, B.; Haiduc, M.; Hutter, D.; Hwang, D. S.; Kharlov, Y.; Kim, M.; Kobayashi, T.; Krelina, M.; Krivda, M.; Kugathasan, T.; Kurashvili, P.; Kwon, Y.; Leogrande, E.; León Monzón, I.; Lippmann, C.; Lisa, M. A.; Lunardon, M.; Malaev, M.; Martin, N. A.; Mazer, J.; Miśkowiec, D.; Mitu, C. M.; Moreira De Godoy, D. A.; Muhuri, S.; Musa, L.; Nayak, K.; Ng, F.; Oppedisano, C.; Pal, S. K.; Paul, B.; Pereira Da Costa, H.; Pereira De Oliveira Filho, E.; Petta, C.; Piano, S.; Polichtchouk, B.; Prasad, S. K.; Qvigstad, H.; Rakotozafindrabe, A.; Räsänen, S. S.; Rascanu, B. T.; Ristea, C.; Rodriguez Manso, A.; Romita, R.; Roy, P.; Sahoo, S.; Saini, J.; Sandoval, A.; Scarlassara, F.; Schiaua, C.; Sitar, B.; Tangaro, M. A.; Tarzila, M. G.; Toia, A.; Trogolo, S.; Trubnikov, V.; Vajzer, M.; Vauthier, A.; Viinikainen, J.; Vilakazi, Z.; Yang, P.; Zgura, I. S.; Zichichi, A.

    Physics letters. B, 12/2015, Letnik: 751, Številka: C
    Journal Article

    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 < y < 0.9 is dσ$coh\atop{ψ(2s)}$ /dy= 0.83±0.19 (stat + syst) mb . Also, the ψ(2S) to J/ψ coherent cross section ratio is 0.34$+0.08\atop{-0.07}$ (stat + syst). The obtained results are compared to predictions from theoretical models.