Generating heavy quarkonia in a perturbative QCD cascade

Ernström, P.; Lönnblad, Leif

doi:10.1007/s002880050446

Cited by 8 publications

(5 citation statements)

References 23 publications

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“…In the former case, the state does not radiate and the onium is therefore produced in isolation, while it is sensible to assume that a shower can evolve in the latter case, giving an onium state embedded in some amount of jet activity. Currently, both cases are initiated by 2 → 2 interactions directly producing an onium state; the alternative mechanism of producing onia during the shower evolution itself [96] is not (yet) implemented. Emissions off an octet-onium state could easily break up a semi-bound quark pair, but might also create a new semi-bound state, and to some approximation these two effects should balance in the onium production rate.…”

Section: Electroweak Showermentioning

confidence: 99%

A comprehensive guide to the physics and usage of PYTHIA 8.3

Bierlich¹,

Chakraborty²,

Desai³

et al. 2022

Preprint

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This manual describes the PYTHIA 8.3 event generator, the most recent version of an evolving physics tool used to answer fundamental questions in particle physics. The program is most often used to generate high-energy-physics collision "events", i.e. sets of particles produced in association with the collision of two incoming high-energy particles, but has several uses beyond that. The guiding philosophy is to produce and re-produce properties of experimentally obtained collisions as accurately as possible. The program includes a wide ranges of reactions within and beyond the Standard Model, and extending to heavy ion physics. Emphasis is put on phenomena where strong interactions play a major role.The manual contains both pedagogical and practical components. All included physics models are described in enough detail to allow the user to obtain a cursory overview of used assumptions and approximations, enabling an informed evaluation of the program output. A number of the most central algorithms are described in enough detail that the main results of the program can be reproduced independently, allowing further development of existing models or the addition of new ones.Finally, a chapter dedicated fully to the user is included towards the end, providing pedagogical examples of standard use cases, and a detailed description of a number of external interfaces. The program code, the online manual, and the latest version of this print manual can be found on the PYTHIA web

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Section: Electroweak Showermentioning

confidence: 99%

A comprehensive guide to the physics and usage of PYTHIA 8.3

Bierlich¹,

Chakraborty²,

Desai³

et al. 2022

Preprint

Self Cite

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“…Next, because none of the models considered include the dominant octet production mechanism the large underestimates of ϒ [206,228] production are not too surprising. Only ARIADNE, version 4.09 onwards, has been extended to include an approximation to the perturbative colour octet production mechanism [241]. This program is therefore the only one containing the necessary physics to attempt to describe the ϒ data.…”

Section: Rates For Heavy Quarkoniamentioning

confidence: 99%

Hadronization in decay

Knowles

Lafferty

1997

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

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Abstract. The confinement transition from the quark and gluon degrees of freedom appropriate in perturbation theory to the hadrons observed by real world experiments is poorly understood. In this strongly interacting transition regime we presently rely on models, which to varying degrees reflect possible scenarios for the QCD dynamics. Because of the absence of beam and target remnants, and the clean experimental conditions and high event rates, e + e − annihilation to hadrons at the Z 0 provides a unique laboratory, both experimentally and theoretically, for the study of parton hadronization. This review discusses current theoretical understanding of the hadronization of partons, with particular emphasis on models of the nonperturbative phase, as implemented in Monte Carlo simulation programs. Experimental results at LEP and SLC are summarised and considered in the light of the models. Suggestions are given for further measurements which could help to produce more progress in understanding hadronization.

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“…An alternative to the standard approach, which is also based on NRQCD, is the calculation of J=ψ meson production within jets using either analytic resummation [32] or the parton shower of a Monte Carlo event generator [33]. Quarkonium production in the parton shower, which can explain the lack of observed polarization [34], predicts that J=ψ mesons are rarely produced in isolation.…”

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confidence: 99%

Study of J/ψ Production in Jets

Aaij¹,

Ciezarek²,

Collins³

et al. 2017

Phys. Rev. Lett.

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The production of J=ψ mesons in jets is studied in the forward region of proton-proton collisions using data collected with the LHCb detector at a center-of-mass energy of 13 TeV. The fraction of the jet transverse momentum carried by the J=ψ meson, zðJ=ψÞ ≡ p T ðJ=ψÞ=p T ðjetÞ, is measured using jets with p T ðjetÞ > 20 GeV in the pseudorapidity range 2.5 < ηðjetÞ < 4.0. The observed zðJ=ψÞ distribution for J=ψ mesons produced in b-hadron decays is consistent with expectations. However, the results for prompt J=ψ production do not agree with predictions based on fixed-order nonrelativistic QCD. This is the first measurement of the p T fraction carried by prompt J=ψ mesons in jets at any experiment.

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Generating heavy quarkonia in a perturbative QCD cascade

Cited by 8 publications

References 23 publications

A comprehensive guide to the physics and usage of PYTHIA 8.3

A comprehensive guide to the physics and usage of PYTHIA 8.3

Hadronization in decay

Study of J/ψ Production in Jets

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