Phenomenological analysis of associated production of $Z^0+b$ in the $b\to J/\psi X$ decay channel at the LHC

Abstract

The ATLAS collaboration recently reported on the first observation of associated-production of a $Z^0$ boson with a $J/\psi$. We recently claimed that the corresponding yield of the {\it prompt} $J/\psi$ was dominated by double parton scatterings in the ATLAS acceptance with a somewhat small value of ${\sigma }_{\mathrm{eff}}$. We also found out that single parton scatterings were only dominant at large transverse momenta. We present here the first phenomenological analysis of another part of the ATLAS data sample, namely of a $Z^0$ boson plus a {\it non-prompt} $J/\psi$. Our study is performed at next-to-leading order in ${\alpha }_s$ and includes parton-shower effects via the {\sc\small MadGraph5_aMC@NLO} framework. We find out that the data, unlike the case of prompt $J/\psi +Z^0$, do not hint at significant DPS contributions. Owing to the current experimental and theoretical uncertainties, there is still a room for these but with a lower limit of ${\sigma }_{\mathrm{eff}}$ close to 5 mb. We stress the importance of QCD corrections to account for the ATLAS data.

12 pages, 3 figures, 4 tables; v2: matched to journal version

References in corpus (19)

• The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations
• Heavy quarkonium: progress, puzzles, and opportunities
• Reducing full one-loop amplitudes to scalar integrals at the integrand level
• Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations
• FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order
• Automation of next-to-leading order computations in QCD: the FKS subtraction
• J/psi, psi' and Upsilon Production at Hadron Colliders: a review
• The four jet production at LHC and Tevatron in QCD
• Measurement of the prompt $J/\psi$ pair production cross-section in $pp$ collisions at $\sqrt{s}=8$ TeV with the ATLAS detector
• Measurement of prompt J/psi pair production in pp collisions at sqrt(s) = 7 TeV
• 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
• Double Parton Correlations in the Bag Model
• Conventional versus single-ladder-splitting contributions to double parton scattering production of two quarkonia, two Higgs bosons and $c\bar{c}c\bar{c}$
• Complete Nonrelativistic-QCD Prediction for Prompt Double $J/\psi$ Hadroproduction
• NLO QCD corrections to Z b anti-b production with massive bottom quarks at the Fermilab Tevatron
• Production of $J/\psi +{\chi }_c$ and $J/\psi +J/\psi$ with real gluon emission at LHC
• Double parton scattering in pair-production of $J/\psi$ mesons at the LHC revisited
• A second update on double parton distributions
• Constraining double parton correlations and interferences

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• Complete NLO QCD study of single- and double-quarkonium hadroproduction in the colour-evaporation model at the Tevatron and the LHC
• Triple prompt $J/\psi$ hadroproduction as a hard probe of multiple-parton scatterings
• Prospects for quarkonium studies at the high-luminosity LHC
• Probing impact-parameter dependent nuclear parton densities from double parton scatterings in heavy-ion collisions
• Observation of double J/$\psi$ meson production in pPb collisions at $\sqrt{s_{\mathrm{NN}}}$ = 8.16 TeV
• Valence and sea parton correlations in double parton scattering from data
• Associated production of prompt $J/\psi$ and ${\rm Y}$ mesons in $pp$ collisions at $\sqrt{s}=13\mathrm{TeV}$
• FKS subtraction for quarkonium production at NLO
• Measurement of inclusive J/$\psi$ pair production cross section in pp collisions at $\sqrt{s}=13$ TeV
• Momentum fraction and hard scale dependence of double parton scattering
• Automated event generation for S-wave quarkonium and leptonium production in NRQCD and NRQED