Abstract: The ALICE Collaboration has studied the inclusive production of the charmonium state ψ(2S) in proton-lead (p-Pb) collisions at the nucleon-nucleon centre of mass energy (formula presented.) = 5.02 TeV at the CERN LHC. The measurement was performed at forward (2.03 < y<inf>cms</inf>< 3.53) and backward (−4.46 < y<inf>cms</inf>< −2.96) centre of mass rapidities, studying the decays into muon pairs. In this paper, we present the inclusive production cross sections σ<inf>ψ(2S)</inf>, both integrated and as a function of the transverse momentum p<inf>T</inf>, for the two y<inf>cms</inf> domains. The results are compared to those obtained for the 1S vector state (J/ψ), by showing the ratios between the production cross sections, as well as the double ratios [σ<inf>ψ(2S)</inf>/σ<inf>J/ψ</inf> ]<inf>pPb</inf>/[σ<inf>ψ(2S)</inf>/σ<inf>J/ψ</inf>]<inf>pp</inf> between p-Pb and proton-proton collisions. Finally, the nuclear modification factor for inclusive ψ(2S) is evaluated and compared to the measurement of the same quantity for J/ψ and to theoretical models including parton shadowing and coherent energy loss mechanisms. The results show a significantly larger suppression of the ψ(2S) compared to that measured for J/ψ and to models. These observations represent a clear indication for sizeable final state effects on ψ(2S) production.[Figure not available: see fulltext. © 2014, The Author(s).

Suppression of ψ(2S) production in p-Pb collisions at (Formula presneted.) / Abelev, B., Adam, J., Adamová, D., Aggarwal, M.M., Agnello, M., Agostinelli, A., Agrawal, N., Ahammed, Z., Ahmad, N., Ahmed, I., Ahn, S.U., Ahn, S.A., Aimo, I., Aiola, S., Ajaz, M., Akindinov, A., Alam, S.N., Aleksandrov, D., Alessandro, B., Alexandre, D., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2014:12(2014). [10.1007/JHEP12(2014)073]

Suppression of ψ(2S) production in p-Pb collisions at (Formula presneted.)

BRUNO, Giuseppe Eugenio;
2014

Abstract

Abstract: The ALICE Collaboration has studied the inclusive production of the charmonium state ψ(2S) in proton-lead (p-Pb) collisions at the nucleon-nucleon centre of mass energy (formula presented.) = 5.02 TeV at the CERN LHC. The measurement was performed at forward (2.03 < ycms< 3.53) and backward (−4.46 < ycms< −2.96) centre of mass rapidities, studying the decays into muon pairs. In this paper, we present the inclusive production cross sections σψ(2S), both integrated and as a function of the transverse momentum pT, for the two ycms domains. The results are compared to those obtained for the 1S vector state (J/ψ), by showing the ratios between the production cross sections, as well as the double ratios [σψ(2S)J/ψ ]pPb/[σψ(2S)J/ψ]pp between p-Pb and proton-proton collisions. Finally, the nuclear modification factor for inclusive ψ(2S) is evaluated and compared to the measurement of the same quantity for J/ψ and to theoretical models including parton shadowing and coherent energy loss mechanisms. The results show a significantly larger suppression of the ψ(2S) compared to that measured for J/ψ and to models. These observations represent a clear indication for sizeable final state effects on ψ(2S) production.[Figure not available: see fulltext. © 2014, The Author(s).
2014
https://link.springer.com/article/10.1007%2FJHEP12%282014%29073
Suppression of ψ(2S) production in p-Pb collisions at (Formula presneted.) / Abelev, B., Adam, J., Adamová, D., Aggarwal, M.M., Agnello, M., Agostinelli, A., Agrawal, N., Ahammed, Z., Ahmad, N., Ahmed, I., Ahn, S.U., Ahn, S.A., Aimo, I., Aiola, S., Ajaz, M., Akindinov, A., Alam, S.N., Aleksandrov, D., Alessandro, B., Alexandre, D., et al.. - In: JOURNAL OF HIGH ENERGY PHYSICS. - ISSN 1029-8479. - 2014:12(2014). [10.1007/JHEP12(2014)073]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11589/56987
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