Observation of triple J/ψ meson production in proton-proton collisions

The CMS Collaboration; A. Tumasyan; W. Adam; P. Eerola; Laurent Forthomme; H. Kirschenmann; K. Österberg; M. Voutilainen; Shudhashil Bharthuar; Erik Brücken; F. Garcia; J. Havukainen; Jaana Heikkilä; Minsuk Kim; R. Kinnunen; T. Lampén; K. Lassila-Perini; S. Laurila; S. Lehti; T. Lindén; Mikko Lotti; P. Luukka; Laura Martikainen; Mikael Erkki Johannes Myllymäki; Jennifer Ott; Juska Pekkanen; H. Siikonen; E. Tuominen; J. Tuominiemi; Jussi Viinikainen; H. Petrow; T. Tuuva

doi:10.1038/s41567-022-01838-y

Observation of triple J/ψ meson production in proton-proton collisions

The CMS Collaboration, A. Tumasyan, W. Adam, P. Eerola, Laurent Forthomme, H. Kirschenmann, K. Österberg, M. Voutilainen, Shudhashil Bharthuar, Erik Brücken, F. Garcia, J. Havukainen, Jaana Heikkilä, Minsuk Kim, R. Kinnunen, T. Lampén, K. Lassila-Perini, S. Laurila, S. Lehti, T. LindénMikko Lotti, P. Luukka, Laura Martikainen, Mikael Erkki Johannes Myllymäki, Jennifer Ott, Juska Pekkanen, H. Siikonen, E. Tuominen, J. Tuominiemi, Jussi Viinikainen, H. Petrow, T. Tuuva

Research output: Contribution to journal › Article › Scientific › peer-review

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/psi 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/psi 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/psi 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.

Original language	English
Journal	Nature Physics
Volume	19
Issue number	3
Pages (from-to)	338–350
Number of pages	17
ISSN	1745-2473
DOIs	https://doi.org/10.1038/s41567-022-01838-y
Publication status	Published - Mar 2023
MoE publication type	A1 Journal article-refereed

Bibliographical note

A Publisher Correction to this article was published on 27 February 2023. https://doi.org/10.1038/s41567-023-01992-x

Fields of Science

114 Physical sciences
Double parton interactions
P(p)over-bar collisions
Matrix-element
Jet events
Helac-onia
Scatterings
Generator
Pp

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Cite this

The CMS Collaboration, Tumasyan, A., Adam, W., Eerola, P., Forthomme, L., Kirschenmann, H., Österberg, K., Voutilainen, M., Bharthuar, S., Brücken, E., Garcia, F., Havukainen, J., Heikkilä, J., Kim, M., Kinnunen, R., Lampén, T., Lassila-Perini, K., Laurila, S., Lehti, S., ... Tuuva, T. (2023). Observation of triple J/ψ meson production in proton-proton collisions. Nature Physics, 19(3), 338–350. https://doi.org/10.1038/s41567-022-01838-y

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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/psi 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/psi 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/psi 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.",

keywords = "114 Physical sciences, Double parton interactions, P(p)over-bar collisions, Matrix-element, Jet events, Helac-onia, Scatterings, Generator, Pp",

author = "{The CMS Collaboration} and A. Tumasyan and W. Adam and P. Eerola and Laurent Forthomme and H. Kirschenmann and K. {\"O}sterberg and M. Voutilainen and Shudhashil Bharthuar and Erik Br{\"u}cken and F. Garcia and J. Havukainen and Jaana Heikkil{\"a} and Minsuk Kim and R. Kinnunen and T. Lamp{\'e}n and K. Lassila-Perini and S. Laurila and S. Lehti and T. Lind{\'e}n and Mikko Lotti and P. Luukka and Laura Martikainen and Myllym{\"a}ki, {Mikael Erkki Johannes} and Jennifer Ott and Juska Pekkanen and H. Siikonen and E. Tuominen and J. Tuominiemi and Jussi Viinikainen and H. Petrow and T. Tuuva",

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The CMS Collaboration, Tumasyan, A, Adam, W, Eerola, P, Forthomme, L, Kirschenmann, H , Österberg, K , Voutilainen, M, Bharthuar, S, Brücken, E , Garcia, F, Havukainen, J, Heikkilä, J, Kim, M, Kinnunen, R, Lampén, T, Lassila-Perini, K , Laurila, S , Lehti, S , Lindén, T, Lotti, M, Luukka, P, Martikainen, L, Myllymäki, MEJ, Ott, J, Pekkanen, J, Siikonen, H, Tuominen, E , Tuominiemi, J, Viinikainen, J, Petrow, H & Tuuva, T 2023, 'Observation of triple J/ψ meson production in proton-proton collisions', Nature Physics, vol. 19, no. 3, pp. 338–350. https://doi.org/10.1038/s41567-022-01838-y

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T1 - Observation of triple J/ψ meson production in proton-proton collisions

AU - The CMS Collaboration

AU - Tumasyan, A.

AU - Adam, W.

AU - Eerola, P.

AU - Forthomme, Laurent

AU - Kirschenmann, H.

AU - Österberg, K.

AU - Voutilainen, M.

AU - Bharthuar, Shudhashil

AU - Brücken, Erik

AU - Garcia, F.

AU - Havukainen, J.

AU - Heikkilä, Jaana

AU - Kim, Minsuk

AU - Kinnunen, R.

AU - Lampén, T.

AU - Lassila-Perini, K.

AU - Laurila, S.

AU - Lehti, S.

AU - Lindén, T.

AU - Lotti, Mikko

AU - Luukka, P.

AU - Martikainen, Laura

AU - Myllymäki, Mikael Erkki Johannes

AU - Ott, Jennifer

AU - Pekkanen, Juska

AU - Siikonen, H.

AU - Tuominen, E.

AU - Tuominiemi, J.

AU - Viinikainen, Jussi

AU - Petrow, H.

AU - Tuuva, T.

N1 - A Publisher Correction to this article was published on 27 February 2023. https://doi.org/10.1038/s41567-023-01992-x

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N2 - 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/psi 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/psi 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/psi 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.

AB - 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/psi 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/psi 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/psi 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.

KW - 114 Physical sciences

KW - Double parton interactions

KW - P(p)over-bar collisions

KW - Matrix-element

KW - Jet events

KW - Helac-onia

KW - Scatterings

KW - Generator

KW - Pp

U2 - 10.1038/s41567-022-01838-y

DO - 10.1038/s41567-022-01838-y

M3 - Article

SN - 1745-2473

VL - 19

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EP - 350

JO - Nature Physics

JF - Nature Physics

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ER -