Universality of the underlying event in 
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 collisions

Velasquez, A. Ortiz; Palomo, L. Valencia

doi:10.1103/physrevd.96.114019

Cited by 28 publications

(23 citation statements)

References 38 publications

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“…Motivated by the results of our previous work [26], where we shown that the 282 particle production sensitive to the underlying event (UE observables) exhibited an approximate KNO scaling. In this paper we investigated in more detail the scaling properties using data from three experiments at the LHC, as well as We studied the number density in the transverse side divided by the charged- particle density in inelastic pp collisions (KNO variable).…”

Section: Resultsmentioning

confidence: 91%

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Probing color reconnection with underlying event observables at the LHC energies

Velasquez

Palomo

2019

Phys. Rev. D

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In this work we study the underlying-event (UE) activity as a function of the highest jet or charged-particle transverse momentum (p jet T or p leading T ) in terms of number and summed-p T densities of charged particles in the azimuthal region transverse to the leading jet or particle direction. Contrary to inelastic pp LHC data, the UE observables normalised to the charged-particle density obey an approximate Koba-Nielsen-Olesen (KNO) scaling. Based on PYTHIA 8.2 like behavior only in the UE region and the effects are reduced with increasing p jet T due to the hardening of UE. The outcomes encourage the measurement of inclusive and identified charged-particle p T spectra (over a wide range of p T ) associated to UE aimed at better understanding the similarities between pp and heavy-ion data discovered at the LHC.to inelastic events. This allows to enhance color-reconnection effects on the hadronization.Specifically, in this paper we study the modification of the traditional UE 48 observables when charged particles within different p T intervals are considered.

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Section: Resultsmentioning

confidence: 91%

“…Little or no energy dependence is observed after the implementation of the scaling factor. This is 117 what we called "universality of UE" in our previous work where p leading T was used instead [26]. The results are compared with PYTHIA 8 simulations since it reproduces very well many features of LHC data.…”

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confidence: 87%

Probing color reconnection with underlying event observables at the LHC energies

Velasquez

Palomo

2019

Phys. Rev. D

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“…At the LHC energies, MPI is the process which occurs at a substantial rate in hadronic collisions and is a very important ingredient in explaining the multiplicity dependence of various observables. MPI incorporated in PYTHIA8, is able to describe many of the experimentally observed features, such as multiplicity distribution and underlying events; light-flavour and heavy-flavor production; and together with color-reconnection, it is able to reproduce flow-like patterns in pp collisions [39][40][41][42][43][44]. Models containing MPI well describe the multiplicity dependence of J/ψ production and thus reveal that MPI is an important mechanism behind the production of J/ψ [7,35].…”

Section: Resultsmentioning

confidence: 99%

J/ψ production dynamics: event shape, multiplicity and rapidity dependence in proton+proton collisions at LHC energies using PYTHIA8

Khatun

Thakur

Deb

et al. 2020

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

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High-multiplicity p + p collisions at the Large Hadron Collider energies have created special importance in view of the Underlying Event (UE) observables. The recent results of LHC such as long range angular correlation, flow like patterns, strangeness enhancement etc. in high multiplicity events are not yet completely understood. In the same direction, the understanding of multiplicity dependence of J/ψ production is highly necessary. In the present study, we have investigated the different trend of multiplicity dependence of J/ψ production at mid-rapidity and forward rapidity through the transverse spherocity analysis. Adding a new variable called transverse spherocity, which describes the event shape, helps to investigate the particle production by isolating the hard and the soft components of the particle production and the importance of jets in high-multiplicity pp collisions. Using this tool, one can extensively study the contribution of jets to the observed structure by separating the isotropic and jetty events from the minimumbias. We have analyzed the J/ψ production at the mid-rapidity and forward rapidities via dielectron and dimuon channels, respectively using 4C tuned PYTHIA8 event generator. The analysis has been performed in two different center-of-mass energies: √ s = 5.02 and 13 TeV, to see the energy dependence of jet contribution to the multiplicity dependence study of J/ψ production. Furthermore, we have studied the production dynamics through the dependence of thermodynamic parameters on event multiplicity and transverse spherocity.

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“…The correlation between particle production at high transverse momentum and the large underlying event activity has been extensively documented for pp and p-Pb collisions [16,17,18,19,20]. Namely, for small systems the underlying event activity increases with increasing the leading particle transverse momentum.…”

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confidence: 99%

Intriguing similarities of high- pT particle production between pp and A−A collisions

2019

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In this paper we study the particle production at high transverse momentum (p T > 8 GeV/c) in both pp and Pb-Pb collisions at LHC energies. The characterization of the spectra is done using a power-law function and the resulting power-law exponent (n) is studied as a function of x T for minimum-bias pp collisions at different √ s. The functional form of n as a function of x T exhibits an approximate universal behavior. PYTHIA 8.212 reproduces the scaling properties and therefore, it is used to study the multiplicity-dependent particle production. Going from low to high multiplicities, the power-law exponent decreases. A similar behavior is also observed in heavy-ion collisions when one studies the centrality-dependent particle production. The interpretation of heavy-ion results requires the quantification of the impact of this correlation (multiplicity and high p T ) on jet-quenching observables.

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Universality of the underlying event in pp collisions

Cited by 28 publications

References 38 publications

Probing color reconnection with underlying event observables at the LHC energies

Probing color reconnection with underlying event observables at the LHC energies

J/ψ production dynamics: event shape, multiplicity and rapidity dependence in proton+proton collisions at LHC energies using PYTHIA8

Intriguing similarities of high- pT particle production between pp and A−A collisions

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