Observation of double <math display="inline"><mrow><mi>J</mi></mrow><mo>/</mo><mi>ψ</mi></math> meson production in <math display="inline"><mrow><mi>p</mi><mi>Pb</mi></mrow></math> collisions at <math display="inline"><mrow><msqrt><mrow><msub><mrow><mi>s</mi></mrow><mrow><mi>NN</mi></mrow></msub></mrow></msqrt><mo>=</mo><mn>8.16</mn><mtext> </mtext><mtext> </mtext><mi>TeV</mi></mrow></math> - INSPIRE

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Observation of double $J / ψ$ meson production in $p Pb$ collisions at $\sqrt{s_{NN}} = 8.16 TeV$

CMS

Collaboration

Jul 3, 2024

41 pages

Published in:

Phys.Rev.D 110 (2024) 9, 092002

Published: Nov 1, 2024

e-Print:

2407.03223 [nucl-ex]

DOI:

10.1103/PhysRevD.110.092002 (publication)

Report number:

CMS-HIN-23-013,
CERN-EP-2024-167

Experiments:

CERN-LHC-CMS

View in:

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Abstract: (APS)

The first observation of the concurrent production of two

J / ψ

mesons in proton-nucleus collisions is presented. The analysis is based on a proton-lead (

p Pb

) data sample recorded at a nucleon-nucleon center-of-mass energy of 8.16 TeV by the CMS experiment at the CERN LHC and corresponding to an integrated luminosity of

174.6 {nb}^{- 1}

. The two

J / ψ

mesons are reconstructed in their

μ^{+} μ^{-}

decay channels with transverse momenta

p_{T} > 6.5 GeV

and rapidity

| y | < 2.4

. Events where one of the

J / ψ

mesons is reconstructed in the dielectron channel are also considered in the search. The

p Pb \to J / ψ J / ψ + X

process is observed with a significance of 5.3 standard deviations. The measured inclusive fiducial cross section, using the four-muon channel alone, is

σ (p Pb \to J / ψ J / ψ + X) = 22.0 \pm 8.9 (stat) \pm 1.5 (syst) nb

. A fit of the data to the expected rapidity separation for pairs of

J / ψ

mesons produced in single (SPS) and double (DPS) parton scatterings yields

σ_{SPS}^{p Pb \to J / ψ J / ψ + X} = 16.5 \pm 10.8 (stat) \pm 0.1 (syst) nb

and

σ_{DPS}^{p Pb \to J / ψ J / ψ + X} = 5.4 \pm 6.2 (stat) \pm 0.4 (syst) nb

, respectively. This latter result can be transformed into a lower bound on the effective DPS cross section, closely related to the squared average interparton transverse separation in the collision, of

σ_{eff} > 1.0 mb

at 95% confidence level.

Note:

Replaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/HIN-23-013 (CMS Public Pages)

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