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 dσψ(2S)coh/dy=0.83±0.19(stat+syst) mb. The ψ(2S) to J/ψ coherent cross section ratio is 0.34-0.07+0.08(stat+syst). The obtained results are compared to predictions from theoretical models. © 2015 CERN for the benefit of the ALICE Collaboration.

Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at sNN=2.76 TeV / Adam, J., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S.U., Aimo, I., Aiola, S., Ajaz, M., Akindinov, A., Alam, S.N., Aleksandrov, D., Alessandro, B., Alexandre, D., Alfaro Molina, R., Alici, A., Alkin, A., Alme, J., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 751:(2015), pp. 358-370. [10.1016/j.physletb.2015.10.040]

Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at sNN=2.76 TeV

BRUNO, Giuseppe Eugenio;
2015

Abstract

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
2015
http://www.sciencedirect.com/science/article/pii/S0370269315007996
Coherent ψ(2S) photo-production in ultra-peripheral PbPb collisions at sNN=2.76 TeV / Adam, J., Adamová, D., Aggarwal, M.M., Aglieri Rinella, G., Agnello, M., Agrawal, N., Ahammed, Z., Ahn, S.U., Aimo, I., Aiola, S., Ajaz, M., Akindinov, A., Alam, S.N., Aleksandrov, D., Alessandro, B., Alexandre, D., Alfaro Molina, R., Alici, A., Alkin, A., Alme, J., et al.. - In: PHYSICS LETTERS. SECTION B. - ISSN 0370-2693. - 751:(2015), pp. 358-370. [10.1016/j.physletb.2015.10.040]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/80375
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