Study of J/$\psi$ meson production inside jets in pp collisions at $\sqrt{s}=$ 8 TeV

Abstract

A study of the production of prompt J/$\psi$ mesons contained in jets in proton-proton collisions at $\sqrt{s}=$ 8 TeV is presented. The analysis is based on data corresponding to an integrated luminosity of 19.1 fb${}^{-1}$ collected with the CMS detector at the LHC. For events with at least one observed jet, the angular separation between the J/$\psi$ meson and the jet is used to test whether the J/$\psi$ meson is part of the jet. The analysis shows that most prompt J/$\psi$ mesons with energy above 15 GeV and rapidity $|y|<$ 1 are contained in jets with pseudorapidity $|{\eta }_{\text{jet}}|$ $<$ 1. The differential distributions of the probability to have a J/$\psi$ meson contained in a jet as a function of jet energy for a fixed J/$\psi$ energy fraction are compared to a theoretical model using the fragmenting jet function approach. The data agree best with fragmenting jet function calculations that use a long-distance matrix element parameter set in which prompt J/$\psi$ mesons are predicted to be unpolarized. This technique demonstrates a new way to test predictions for prompt J/$\psi$ production using nonrelativistic quantum chromodynamics.

arXiv commentReplaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/BPH-15-003 (CMS Public Pages)

References in corpus (31)

• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• The anti-k_t jet clustering algorithm
• FastJet user manual
• New Generation of Parton Distributions with Uncertainties from Global QCD Analysis
• Rigorous QCD Analysis of Inclusive Annihilation and Production of Heavy Quarkonium
• Heavy quarkonium: progress, puzzles, and opportunities
• Particle-flow reconstruction and global event description with the CMS detector
• The CMS trigger system
• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS
• Performance of CMS muon reconstruction in pp collision events at sqrt(s) = 7 TeV
• Color-octet quarkonia production
• Color-octet quarkonia production II
• J/psi polarization at hadron colliders in nonrelativistic QCD
• Reconciling J/psi production at HERA, RHIC, Tevatron, and LHC with NRQCD factorization at next-to-leading order
• Measurement of the Inclusive Upsilon production cross section in pp collisions at sqrt(s)=7 TeV
• Polarizations of J/psi and psi(2S) Mesons Produced in ppbar Collisions at 1.96 TeV
• Prompt and non-prompt J/psi production in pp collisions at sqrt(s) = 7 TeV
• Fragmentation contributions to J/psi production at the Tevatron and the LHC
• Measurement of the prompt J/psi and psi(2S) polarizations in pp collisions at sqrt(s) = 7 TeV
• On the mechanisms of heavy-quarkonium hadroproduction
• J/psi and psi(2S) production in pp collisions at sqrt(s) = 7 TeV
• Quarkonium production in the LHC era: a polarized perspective
• Study of $J/\psi$ production in jets
• Next-to-leading-order tests of nonrelativistic-QCD factorization with $J/\psi$ yield and polarization
• Measurement of J/psi and psi(2S) prompt double-differential cross sections in pp collisions at sqrt(s) = 7 TeV
• QCD corrections to J/psi polarisation in pp collisions at RHIC
• Probing Quarkonium Production Mechanisms with Jet Substructure
• Measurements of the Upsilon(1S), Upsilon(2S), and Upsilon(3S) differential cross sections in pp collisions at sqrt(s) = 7 TeV
• Quarkonium Polarization and the Long Distance Matrix Elements Hierarchies using Jet Substructure

Cited by in corpus (8)

• New Observables in Inclusive Production of Quarkonia
• Polarized jet fragmentation functions
• Fragmentation of jets containing a prompt J$/\psi$ meson in PbPb and pp collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV
• Exploring $J/\psi$ production mechanism at the future Electron-Ion Collider
• Shedding Light on Hadronization by Quarkonium Energy Correlator
• Resummation of threshold double logarithms in hadroproduction of heavy quarkonium
• Measurements of $\psi (2S)$ and ${\chi }_{c1}(3872)$ production within fully reconstructed jets
• Non-Relativistic Quantum Chromodynamics in Parton Showers