Observation of triple J/ψ meson production in proton-proton collisions
dc.contributor.author | Tumasyan, Armen | pt_BR |
dc.contributor.author | Silveira, Gustavo Gil da | pt_BR |
dc.contributor.author | Bernardes, César Augusto | pt_BR |
dc.contributor.author | CMS Collaboration | pt_BR |
dc.date.accessioned | 2023-07-19T03:38:59Z | pt_BR |
dc.date.issued | 2023 | pt_BR |
dc.identifier.issn | 1745-2481 | pt_BR |
dc.identifier.uri | http://hdl.handle.net/10183/262343 | pt_BR |
dc.description.abstract | 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. | en |
dc.format.mimetype | application/pdf | pt_BR |
dc.language.iso | eng | pt_BR |
dc.relation.ispartof | Nature Physics. London. Vol. 19, no. 3 (Mar. 2023), p. 338–350 | pt_BR |
dc.rights | Open Access | en |
dc.subject | Aceleradores de partículas | pt_BR |
dc.subject | Colisões proton-proton | pt_BR |
dc.subject | Mesons | pt_BR |
dc.title | Observation of triple J/ψ meson production in proton-proton collisions | pt_BR |
dc.type | Artigo de periódico | pt_BR |
dc.identifier.nrb | 001166261 | pt_BR |
dc.type.origin | Estrangeiro | pt_BR |
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