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oai:ebyu-rdlopen.rawdatalibrary.net:ebyu/122442026-10-18T20:27:09Zopenairedrivercom_ebyu_10000col_ebyu_10001

Observation of triple J/ψ meson production in proton-proton collisionsTumasyan, A.Adam, W.Andrejkovic, J.W.Bergauer, T.Chatterjee, S.Damanakis, K.Dragicevic, M.Del Valle, A. EscalanteFrühwirth, R.Jeitler, M.Krammer, N.Lechner, L.Liko, D.Mikulec, I.Paulitsch, P.Pitters, F.M.Schieck, J.Schöfbeck, R.Schwarz, D.Templ, S.Waltenberger, W.Wulz, C.-E.Chekhovsky, V.Litomin, A.Makarenko, V.Darwish, M.R.De Wolf, E.A.Janssen, T.Kello, T.Lelek, A.Sfar, H. RejebVan Mechelen, P.Van Putte, S.Remortel, N. VanBlekman, F.Bols, E.S.D’Hondt, J.Delcourt, M.El Faham, H.Lowette, S.Moortgat, S.Morton, A.Müller, D.Sahasransu, A.R.Tavernier, S.Van Doninck, W.Beghin, D.Bilin, B.Clerbaux, B.De Lentdecker, G.HadronsCharm quarksLarge Hadron ColliderLarge-hadron collidersMeson productionParton scatteringProton proton collisionsQuark antiquark pairScattering probabilitiesStandard deviationStatistical significanceBosonsProtons 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 significance above five standard deviations. We measured the inclusive fiducial cross-section to be 272−104+141(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, double- and triple-parton scattering are the dominant contributions for the measured process. © 2023, CERN.Nature Research2023Articlehttps://rdlopen.rawdatalibrary.net/r/ebyu/12244https://doi.org/10.1038/s41567-022-01838-y1745-2473enNature Physicsinfo:eu-repo/semantics/openAccessinfo:eu-repo/semantics/articlehttps://ebyu-rdlopen.rawdatalibrary.net/tr/items/ebyu/12244