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The cross section for coherent J/ψ photoproduction accompanied by at least one neutron on one side of the interaction point and no neutron activity on the other side, X[subscript n]0[subscript n], is measured with the CMS experiment in ultra-peripheral PbPb collisions at √s[subscript NN = 2.76 TeV. The analysis is based on a data sample corresponding to an integrated luminosity of 159μb ⁻¹, collected during the 2011 PbPb run. The J/ψ mesons are reconstructed in the dimuon decay channel, while neutrons are detected using zero degree calorimeters. The measured cross section is dσ [subscript Xn0n][superscript coh] /dy(J/ψ)=0.36±0.04(stat)±0.04(syst) mb in the rapidity interval 1.8 < |y| < 2.3. Using a model for the relative rate of coherent photoproduction processes, this X n 0 n measurement gives a total coherent photoproduction cross section of dσ[superscript coh] /dy(J/ψ)=1.82±0.22(stat)±0.20(syst)±0.19(theo) mb. The data strongly disfavor the impulse approximation model prediction, indicating that nuclear effects are needed to describe coherent J/ψ photoproduction in γ+Pb interactions. The data are found to be consistent with the leading twist approximation, which includes nuclear gluon shadowing.

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CMS Collaboration -  Apyan, Aram -  Barbieri, Richard Alexander -  Baty, Austin Alan -  Bi, Ran -  Bierwagen, Katharina -  Brandt, Stephanie Akemi -  Busza, Wit -  Cali, Ivan Amos -  Demiragli, Zeynep -  Di Matteo, Leonardo -  Gomez -  Ceballos, Guillelmo -  Goncharov, Maxim -  Gulhan, Doga Can -  Iiyama, Yutaro -  Innocenti, Gian Michele -  Klute, Markus -  Kovalskyi, Dmytro -  Krajczar, Krisztian F. -  Lai, Yue Shi -  Lee, Yen -  Jie -  Levin, Andrew Michael -  Luckey Jr, P David -  Marini, Andrea Carlo -  McGinn, Christopher Francis -  Mironov, Camelia Maria -  Narayanan, Siddharth Madhavan -  Niu, Xinmei -  Paus, Christoph M. E. -  Roland, Christof E -  Roland, Gunther M -  Salfeld -  Nebgen, Jakob Maxillian Henry -  Stephans, George S. F. -  Sumorok, Konstanty C -  Tatar, Kaya -  Varma, Mukund Madhav -  Velicanu, Dragos Alexandru -  Veverka, Jan -  Wang, Jing -  Wang, Ta -  Wei -  Wyslouch, Boleslaw -  Yang, Ming -  Wyslouch, Victoria - 

Id.: 71382013

Versión: 1.0

Estado: Final

Tipo de recurso: Article  -  http://purl.org/eprint/type/JournalArticle  - 

Tipo de Interactividad: Expositivo

Nivel de Interactividad: muy bajo

Audiencia: Estudiante  -  Profesor  -  Autor  - 

Estructura: Atomic

Coste: no

Copyright: sí

: Creative Commons Attribution 4.0 International License

Requerimientos técnicos:  Browser: Any - 

Relación: [IsBasedOn] Elsevier
[References] http://dx.doi.org/10.1016/J.PHYSLETB.2017.07.001
[References] Physics Letters B

Fecha de contribución: 10-jun-2018


* 0370-2693
* Khachatryan, V. et al. “Coherent J/ ψ Photoproduction in Ultra-Peripheral PbPb Collisions at √s[subscript NN = 2.76 TeV with the CMS Experiment.” Physics Letters B 772 (September 2017): 489–511 © 2017 The Author(s)

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