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Title

Measurement of the production cross section of prompt J/ψ mesons in association with a W ± boson in pp collisions at √s = 7 TeV with the ATLAS detector

AuthorsAad, G.; Cabrera, Susana ; Castillo, Mª Victoria ; Costa, María José ; Fassi, F. ; Ferrer, Antonio ; Fiorini, L. ; Fuster, Juan ; García García, Carmen ; García Navarro, José Enrique ; González de la Hoz, Santiago ; Hernández Jiménez, Yesenia ; Higón, Emilio ; Irles Quiles, Adrián ; Kaci, Mohamed ; Lacasta Llácer, Carlos ; Lacuesta, Vicente ; March, Luis ; Martí García, Salvador ; Miñano, Mercedes ; Mitsou, Vasiliki A. ; Moles Valls, Regina ; Moreno Llácer, María ; Oliver García, Elena ; Pedraza López, Sebastián ; Pérez García-Estañ, María Teresa ; Romero Adam, E. ; Ros, Eduardo ; Salt, José ; Sánchez Martínez, Javier ; Sánchez Martínez, Victoria ; Soldevila, Urmila ; Torró Pastor, Emma ; Valero, Alberto ; Valladolid Gallego, Eva ; Valls Ferrer, Juan Antonio ; Villaplana Pérez, Miguel ; Vos, Marcel ; Zwalinski, L.; ATLAS Collaboration
KeywordsHadron-Hadron Scattering
Issue Date28-Apr-2014
PublisherSpringer
CitationJournal of High Energy Physics 2014:172 (2014)
AbstractThe process pp → W ± J/ψ provides a powerful probe of the production mechanism of charmonium in hadronic collisions, and is also sensitive to multiple parton interactions in the colliding protons. Using the 2011 ATLAS dataset of 4.5 fb−1 of s√ = 7 TeV pp collisions at the LHC, the first observation is made of the production of W ± + prompt J/ψ events in hadronic collisions, using W ± → μν μ and J/ψ → μ + μ −. A yield of 27.4+7.5−6.5 W ± + prompt J/ψ events is observed, with a statistical significance of 5.1σ. The production rate as a ratio to the inclusive W ± boson production rate is measured, and the double parton scattering contribution to the cross section is estimated.
DescriptionAad, G. et al.
Publisher version (URL)http://dx.doi.org/10.1007/JHEP04(2014)172
URIhttp://hdl.handle.net/10261/96970
DOI10.1007/JHEP04(2014)172
E-ISSN1029-8479
Appears in Collections:(IFIC) Artículos
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