The role of multi-parton interactions in doubly-heavy hadron production

Egede, U.; Hadavizadeh, T.; Singla, M.; Vesterinen, M.

doi:10.1140/epjc/s10052-022-10710-5

Cited by 5 publications

(3 citation statements)

References 51 publications

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“…Phenomenologically, the MPI effect plays a significant role in charm-quark production [42]. In the MPI picture, the average number of heavy-quark pairs in pp collision increases compared to the traditional pQCD picture of single hard scattering [43]. Along with the color reconnection model for J/ψ hadronization treatment, a significant enhancement of the J/ψ production cross-section [30] is predicted.…”

Section: Recent Developmentsmentioning

confidence: 98%

Measurements of J/ψ Production vs. Event Multiplicity in Forward Rapidity in p + p Collisions in the PHENIX Experiment

Shi

2023

Universe

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J/ψ, a charmonium bound state made of a charm and an anti-charm quark, was discovered in the 1970s and confirmed the quark model. Because the mass of charm quarks is significantly above the quantum chromodynamics (QCD) scale ΛQCD, charmonia are considered excellent probes to test perturbative quantum chromodynamics (pQCD) calculations. In recent decades, they have been studied extensively at different high-energy colliders. However, their production mechanisms, which involve multiple scales, are still not very well understood. Recently, in high-multiplicity p+p collisions at RHIC and at the LHC, a significant enhancement of J/ψ production yield has been observed, which suggests a strong contribution of multi-parton interaction (MPI). This is different from the traditional pQCD picture, where charm quark pairs are produced from a single hard scattering between partons in p+p collisions. In this work, we will report the J/ψ normalized production yield as a function of normalized charged particle multiplicity over a board range of rapidity and event multiplicity in the J/ψ→μ+μ− channel with PHENIX Run 15 p+p data at s=200 GeV. The results are compared with PYTHIA 8 simulations with the MPI option turned on and off. Finally, the outlooks of J/ψ in p+Au and Au+p collisions, along with color glass condensate (CGC) predictions and the multiplicity-dependent ψ(2S)/J/ψ ratio in p+p data, will be briefly discussed.

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Section: Recent Developmentsmentioning

confidence: 98%

Measurements of J/ψ Production vs. Event Multiplicity in Forward Rapidity in p + p Collisions in the PHENIX Experiment

Shi

2023

Universe

View full text Add to dashboard Cite

show abstract

“…Phenomenologically, the MPI effect plays a significant role on charm-quark production [42]. In the MPI picture, the average number of heavy-quark pairs in pp collision increases compared to tradition pQCD picture of single hard scattering [43]. Along with the color reconnection model for J/ψ hadronization treatment, a significant enhancement of J/ψ production cross section [30] is predicted.…”

Section: Recent Developmentsmentioning

confidence: 98%

Measurements of J/ψ Production vs Event Multiplicity in the Forward Rapidity in p + p Collisions in the PHENIX Experiment

Shi¹

2023

Preprint

View full text Add to dashboard Cite

J/ψ, a charmonium bound state made of a charm and an anti-charm quark, has been discovered in the 1970s and confirmed the quark model. Because the mass of charms quarks is significantly above the Quantum Chromodynamics (QCD) scale ΛQCD, charmonia are considered as excellent probes to test perturbative Quantum Chromodynamics (pQCD) calculations. Over the past decades, they have been studied extensively at different high energy colliders. However, their production mechanisms, which involves multiple scales, are still not very well understood. Recently, in high multiplicity p+p collisions at RHIC and at the LHC, a significant enhancement of J/ψ production yield has been observed, which suggests a strong contribution from the Multi-Parton Interaction (MPI). This is different from the traditional pQCD picture where charm quark pairs are produced from a single hard scattering between partons in p+p collisions. In this work, we will report the J/ψ normalized production yield as a function of normalized charged particle multiplicity over a board range of rapidity and event multiplicity in the J/ψ→μ+μ− channel with PHENIX Run 15 p+p data at \sqrt{s}=200 GeV. The results are compared with PYTHIA 8 simulations with the MPI option on and off. Finally, the outlooks of J/ψ in p+Au and Au+p collisions along with Color Glass Condensate (CGC) predictions and of multiplicity dependent ψ(2S)/J/ψ ratio in p+p data will be briefly discussed.

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“…We have generated the data-set for 'soft-QCD = on' and 'hard-QCD = off' at different LHC energies. The framework of PYTHIA v8.3 is organized into three main parts: process level, parton level, and hadron level [48]. The hard-scattering process, which produces transient resonances, is represented at the process level.…”

Section: Pythia V83mentioning

confidence: 99%

Study of forward–backward correlation and multiplicity fluctuations of pions produced in p–p collisions at recent LHC energies

Paul,

Bhattacharjee,

Ahmed

et al. 2023

J. Phys. G: Nucl. Part. Phys.

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The two-particle rapidity correlation among the pions produced in p-p collisions at recent LHC energies √s= 2.76, 5.02, 7 & 13 TeV is studied in this paper by using the analysis of events generated by UrQMD-3.4, AMPT-2.26 & PYTHIA-8.3. Our investigation for bin-to-bin fluctuation using the variance of Forward-Backward asymmetry parameter σC 2 in the forward-backward pseudo-rapidity windows is done through the simulated data. In addition to that, energy-wise variation of correlation strength (β), the probability distribution of roughness parameter (γk 2) and number density fluctuation parameter (dik) are also incorporated in this investigation. Also, we have tried to study the same for \textbf{the data of different impact parameters generated using the UrQMD model, and the comparison is made with its minimum biased events data-set. The analysis signifies, that the signature of dynamical fluctuation is not so prominent but increases a bit with the increase in energy. An increase in the correlation strength with the increase in energy signifies the contribution of long-range correlation is more in comparison to the short-range one. However, there is no such accountable effect of various impact parameters seen in the present study.

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The role of multi-parton interactions in doubly-heavy hadron production

Cited by 5 publications

References 51 publications

Measurements of J/ψ Production vs. Event Multiplicity in Forward Rapidity in p + p Collisions in the PHENIX Experiment

Measurements of J/ψ Production vs. Event Multiplicity in Forward Rapidity in p + p Collisions in the PHENIX Experiment

Measurements of J/ψ Production vs Event Multiplicity in the Forward Rapidity in p + p Collisions in the PHENIX Experiment

Study of forward–backward correlation and multiplicity fluctuations of pions produced in p–p collisions at recent LHC energies

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