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Título:	Observation of triple J/ψ meson production in proton-proton collisions
Autor:	CMS Collaboration; Brochero Cifuentes, J. A. CSIC ORCID; Cabrillo, I. J. CSIC ORCID ; Calderon, Alicia ; Duarte Campderros, J. CSIC ORCID ; Fernández-García, Marcos CSIC ORCID ; Fernandez Madrazo, C. CSIC ORCID; Fernández Manteca, P. J. CSIC ORCID; García Alonso, A. CSIC ORCID; Gómez, Gervasio CSIC ORCID ; Martínez-Rivero, Celso CSIC ORCID ; Martínez Ruiz del Arbol, P. CSIC ORCID; Matorras, Francisco CSIC ORCID ; Matorras-Cuevas, Pablo CSIC ORCID; Piedra, Jonatan CSIC ORCID ; Prieels, C. CSIC; Ruiz Jimeno, Alberto CSIC ORCID ; Scodellaro, Luca CSIC ORCID ; Vila, Iván CSIC ORCID; Vizán, J. CSIC ORCID
Fecha de publicación:	2023
Editor:	Springer Nature
Citación:	Nature Physics 19: 338-350 (2023)
Resumen:	Protons consist of three valence quarks, two up-quarks and one down-quark, held together by gluons and a sea of quark-antiquark pairs. Collectively, quarks and gluons are referred to as partons. In a proton-proton collision, typically only one parton of each proton undergoes a hard scattering – referred to as single-parton scattering – leaving the remainder of each proton only slightly disturbed. Here, we report the study of double- and triple-parton scatterings through the simultaneous production of three J/ψ mesons, which consist of a charm quark-antiquark pair, in proton-proton collisions recorded with the CMS experiment at the Large Hadron Collider. We observed this process – reconstructed through the decays of J/ψ mesons into pairs of oppositely charged muons – with a statistical signifcance above fve standard deviations. We measured the inclusive fducial cross-section to be 272+141 −104 (stat) ± 17 (syst)fb, and compared it to theoretical expectations for triple-J/ψ meson production in single-, double- and triple-parton scattering scenarios. Assuming factorization of multiple hard-scattering probabilities in terms of single-parton scattering cross-sections, doubleand triple-parton scattering are the dominant contributions for the measured process.
Descripción:	CMS Collaboration: et al.
Versión del editor:	https://doi.org/10.1038/s41567-022-01838-y
URI:	http://hdl.handle.net/10261/349804
DOI:	10.1038/s41567-022-01838-y
E-ISSN:	1745-2481
Aparece en las colecciones:	(IFCA) Artículos