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## Observation and measurements of the production of prompt and non-prompt Jψ Jψ mesons in association with a Z Z boson in pp pp collisions at s √ =8TeV s √ =8TeV with the ATLAS detector

Research output: Contribution to Journal/MagazineJournal articlepeer-review

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### Standard

In: European Physical Journal C: Particles and Fields, Vol. 75, No. 5, 229, 05.2015.

Research output: Contribution to Journal/MagazineJournal articlepeer-review

### Vancouver

The ATLAS collaboration. Observation and measurements of the production of prompt and non-prompt Jψ Jψ mesons in association with a Z Z boson in pp pp collisions at s √ =8TeV s √ =8TeV with the ATLAS detector. European Physical Journal C: Particles and Fields. 2015 May;75(5):229. Epub 2015 May 27. doi: 10.1140/epjc/s10052-015-3406-9

### Bibtex

@article{29128f543c91488cb342ab6e7d8bc363,
title = "Observation and measurements of the production of prompt and non-prompt Jψ Jψ mesons in association with a Z Z boson in pp pp collisions at s √ =8TeV s √ =8TeV with the ATLAS detector",
abstract = "The production of a Z boson in association with a J/ψ meson in proton–proton collisions probes the production mechanisms of quarkonium and heavy flavour in association with vector bosons, and allows studies of multiple parton scattering. Using 20.3fb −1 of data collected with the ATLAS experiment at the LHC in pp collisions at s √ =8TeV , the first measurement of associated Z+J/ψ production is presented for both prompt and non-prompt J/ψ production, with both signatures having a significance in excess of 5σ . The inclusive production cross-sections for Z boson production (analysed in μ + μ − or e + e − decay modes) in association with prompt and non-prompt J/ψ(→μ + μ − ) are measured relative to the inclusive production rate of Z bosons in the same fiducial volume to be (36.8±6.7±2.5)×10 −7 and (65.8±9.2±4.2)×10 −7 respectively. Normalised differential production cross-section ratios are also determined as a function of the Jψ transverse momentum. The fraction of signal events arising from single and double parton scattering is estimated, and a lower limit of 5.3 (3.7)mb at 68 (95)% confidence level is placed on the effective cross-section regulating double parton interactions.",
keywords = "Heavy-Quarkonium, Hadronic Collisions, Z(0) Decay, J-PSI, Upsilon, Physics, QCD, Photoproduction, Fragmentation, Distributions",
author = "Lee Allison and Adam Barton and Michael Beattie and Guennadi Borissov and Eva Bouhova-Thacker and Alexandre Chilingarov and William Dearnaley and Harald Fox and Kathryn Grimm and Robert Henderson and Gareth Hughes and Jones, {Roger William Lewis} and Vakhtang Kartvelishvili and Robin Long and Peter Love and Harvey Maddocks and Maria Smizanska and James Walder and {The ATLAS collaboration}",
year = "2015",
month = may,
doi = "10.1140/epjc/s10052-015-3406-9",
language = "English",
volume = "75",
journal = "European Physical Journal C: Particles and Fields",
issn = "1434-6044",
publisher = "SPRINGER",
number = "5",

}

### RIS

TY - JOUR

T1 - Observation and measurements of the production of prompt and non-prompt Jψ Jψ mesons in association with a Z Z boson in pp pp collisions at s √ =8TeV s √ =8TeV with the ATLAS detector

AU - Allison, Lee

AU - Beattie, Michael

AU - Bouhova-Thacker, Eva

AU - Chilingarov, Alexandre

AU - Dearnaley, William

AU - Fox, Harald

AU - Grimm, Kathryn

AU - Henderson, Robert

AU - Hughes, Gareth

AU - Jones, Roger William Lewis

AU - Kartvelishvili, Vakhtang

AU - Long, Robin

AU - Love, Peter

AU - Smizanska, Maria

AU - Walder, James

AU - The ATLAS collaboration

PY - 2015/5

Y1 - 2015/5

N2 - The production of a Z boson in association with a J/ψ meson in proton–proton collisions probes the production mechanisms of quarkonium and heavy flavour in association with vector bosons, and allows studies of multiple parton scattering. Using 20.3fb −1 of data collected with the ATLAS experiment at the LHC in pp collisions at s √ =8TeV , the first measurement of associated Z+J/ψ production is presented for both prompt and non-prompt J/ψ production, with both signatures having a significance in excess of 5σ . The inclusive production cross-sections for Z boson production (analysed in μ + μ − or e + e − decay modes) in association with prompt and non-prompt J/ψ(→μ + μ − ) are measured relative to the inclusive production rate of Z bosons in the same fiducial volume to be (36.8±6.7±2.5)×10 −7 and (65.8±9.2±4.2)×10 −7 respectively. Normalised differential production cross-section ratios are also determined as a function of the Jψ transverse momentum. The fraction of signal events arising from single and double parton scattering is estimated, and a lower limit of 5.3 (3.7)mb at 68 (95)% confidence level is placed on the effective cross-section regulating double parton interactions.

AB - The production of a Z boson in association with a J/ψ meson in proton–proton collisions probes the production mechanisms of quarkonium and heavy flavour in association with vector bosons, and allows studies of multiple parton scattering. Using 20.3fb −1 of data collected with the ATLAS experiment at the LHC in pp collisions at s √ =8TeV , the first measurement of associated Z+J/ψ production is presented for both prompt and non-prompt J/ψ production, with both signatures having a significance in excess of 5σ . The inclusive production cross-sections for Z boson production (analysed in μ + μ − or e + e − decay modes) in association with prompt and non-prompt J/ψ(→μ + μ − ) are measured relative to the inclusive production rate of Z bosons in the same fiducial volume to be (36.8±6.7±2.5)×10 −7 and (65.8±9.2±4.2)×10 −7 respectively. Normalised differential production cross-section ratios are also determined as a function of the Jψ transverse momentum. The fraction of signal events arising from single and double parton scattering is estimated, and a lower limit of 5.3 (3.7)mb at 68 (95)% confidence level is placed on the effective cross-section regulating double parton interactions.

KW - Heavy-Quarkonium

KW - Z(0) Decay

KW - J-PSI

KW - Upsilon

KW - Physics

KW - QCD

KW - Photoproduction

KW - Fragmentation

KW - Distributions

U2 - 10.1140/epjc/s10052-015-3406-9

DO - 10.1140/epjc/s10052-015-3406-9

M3 - Journal article

VL - 75

JO - European Physical Journal C: Particles and Fields

JF - European Physical Journal C: Particles and Fields

SN - 1434-6044

IS - 5

M1 - 229

ER -