Observation and measurements of the production of prompt and non-prompt $J/\psi$ mesons in association with a $Z$ boson in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

Aad, Georges; Abbott, Brad; Abdallah, Jalal; Abdel Khalek, Samah; Abdinov, Ovsat; Aben, Rosemarie; Abi, Babak; Abolins, Maris; AbouZeid, Ossama; Abramowicz, Halina

doi:10.1140/epjc/s10052-015-3406-9

Observation and measurements of the production of prompt and non-prompt $J/\psi$ mesons in association with a $Z$ boson in $pp$ collisions at $\sqrt{s}$ = 8 TeV with the ATLAS detector

ATLAS

Collaboration

Dec 19, 2014

14 pages

Published in:

Eur.Phys.J.C 75 (2015) 5, 229

Published: May 27, 2015

e-Print:

1412.6428 [hep-ex]

DOI:

10.1140/epjc/s10052-015-3406-9

Report number:

CERN-PH-EP-2014-276

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (Springer)

The production of a

Z

boson in association with a

J/\psi

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

20.3\,\text {fb}^{-1}

of data collected with the ATLAS experiment at the LHC in

pp

collisions at

\sqrt{s}=8\,\text {TeV}

, the first measurement of associated

Z\, +\, J/\psi

production is presented for both prompt and non-prompt

J/\psi

production, with both signatures having a significance in excess of

5\sigma

. The inclusive production cross-sections for

Z

boson production (analysed in

\mu ^+\mu ^-

or

e^+e^-

decay modes) in association with prompt and non-prompt

J/\psi (\rightarrow \mu ^+\mu ^-)

are measured relative to the inclusive production rate of

Z

bosons in the same fiducial volume to be

(36.8\pm 6.7\pm 2.5)\, \times \, 10^{-7}

and

(65.8\pm 9.2\pm 4.2)\, \times \, 10^{-7}

respectively. Normalised differential production cross-section ratios are also determined as a function of the \text {J}\uppsi 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)\,\text {mb}

at

68\ (95) \%

confidence level is placed on the effective cross-section regulating double parton interactions.

Note:

Published version, 15 pages + author list + cover page (30 pages total), 6 figures, 5 tables, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/BPHY-2014-01/

p p: colliding beams
parton: scattering
p p: scattering
J/psi(3100): hadroproduction
J/psi(3100): direct production
J/psi(3100): leptonic decay
Z0: associated production
Z0: leptonic decay
parton: interaction
inclusive production

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