Particle event generator: a simple-in-use system PEGASUS version 1.0

Lipatov, A. V.; Malyshev, M. A.; Baranov, S. P.

doi:10.1140/epjc/s10052-020-7898-6

Cited by 28 publications

(13 citation statements)

References 74 publications

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“…3 as functions of z for several values of scale μ 2 . Using these FFs, we reproduce well the results of calculations performed with the Monte Carlo event generator pegasus [66] (see Fig. 4).…”

Section: The Modelsupporting

confidence: 67%

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Revisiting the production of $$J/\psi $$ pairs at the LHC

et al. 2020

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We consider the prompt double $$J/\psi $$ J / ψ production in pp collisions at the LHC in the framework of $$k_T$$ k T -factorization QCD approach. Using the fragmentation mechanism, we evaluate the color octet contributions to the production cross sections taking into account the combinatorial effects of multiple gluon radiation in the initial state driven by the Ciafaloni–Catani–Fiorani–Marchesini evolution equation. We demonstrate the importance of these contributions in a certain kinematical region covered by the CMS and ATLAS measurements. On the other hand, the experimental data taken by the LHCb Collaboration at forward rapidities and moderate transverse momenta can be described well by $${{{\mathcal {O}}}}(\alpha _s^4)$$ O ( α s 4 ) color singlet terms and contributions from the double parton scattering mechanism. The extracted value of the effective cross section is compatible with many other estimations based on different final states.

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Section: The Modelsupporting

confidence: 67%

“…To generate cc events in the off-shell gluon-gluon fusion the Monte-Carlo event generator pegasus[66] has been used.…”

mentioning

confidence: 99%

Revisiting the production of $$J/\psi $$ pairs at the LHC

et al. 2020

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“…This method imposes angular ordering in addition to virtuality ordering along the evolution ladder. UPDFs distributions at the initial scale μ 0 is chosen to have a factorized form of dependent on the transverse momentum via Gaussian distribution and a parameterized form with dependency on x and μ 2 0 [37,38]. Generally parton branching UPDFs can be written as follows:…”

Section: Pb Updfsmentioning

confidence: 99%

Three-photon productions within the $$k_t$$-factorization at the LHC

2021

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Recently, the ATLAS data of isolated three-photon production showed that the next-to-leading order (NLO) collinear factorization is not enough to describe experimental data. Therefore, one needs to calculate the cross section beyond the NLO, and as showed later, these data can be well described by the NNLO calculation within the collinear factorization framework. However, it is shown that the $$k_t$$ k t -factorization can be quite successful in describing exclusive and high energy collision processes, henceforth we decided to calculate isolated three-photon production within this framework. In this work we use the Martin, Ryskin, and Watt unintegrated parton distribution functions (MRW UPDFs) at LO and NLO levels, in addition to parton branching (PB) UPDFs in order to calculate cross section which we utilize the KATIE parton level event generator. It will be shown that in contrast to collinear factorization, the $$k_t$$ k t -factorization can describe quiet well the three-photon production ATLAS data. Interestingly our results using the NLO-MRW and PB UPDFs can cover the data within their uncertainty bands, similar to the NNLO collinear results.

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“…Several processes with off-shell matrix elements are implemented in Cascade3 as listed in Table 1, and described in detail in [60]. However, many more processes are accessible via the automated matrix element calculators for off-shell processes, KaTie [61] and Pegasus [62]. The events from the hard process are then read with the Cascade3 package via LHE files.…”

Section: Off-shell Processesmentioning

confidence: 99%

CASCADE3 A Monte Carlo event generator based on TMDs

et al. 2021

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The Cascade3 Monte Carlo event generator based on Transverse Momentum Dependent (TMD) parton densities is described. Hard processes which are generated in collinear factorization with LO multileg or NLO parton level generators are extended by adding transverse momenta to the initial partons according to TMD densities and applying dedicated TMD parton showers and hadronization. Processes with off-shell kinematics within $$k_{{t}}$$ k t -factorization, either internally implemented or from external packages via LHE files, can be processed for parton showering and hadronization. The initial state parton shower is tied to the TMD parton distribution, with all parameters fixed by the TMD distribution.

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Particle event generator: a simple-in-use system PEGASUS version 1.0

Cited by 28 publications

References 74 publications

Revisiting the production of $$J/\psi $$ pairs at the LHC

Revisiting the production of $$J/\psi $$ pairs at the LHC

Three-photon productions within the $$k_t$$-factorization at the LHC

CASCADE3 A Monte Carlo event generator based on TMDs

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