On the origin of forward–backward multiplicity correlations in pp collisions at ultrarelativistic energies

Bravina, L.; Bleibel, J.; Zabrodin, E.

doi:10.1016/j.physletb.2018.10.053

Cited by 11 publications

(8 citation statements)

References 56 publications

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“…We observe that the general trends of b corr as a function of η gap , δη, and collision energies as measured by ALICE Collaboration [19], are fairly described by EPOS3 model. Thus, our study corroborates ALICE experimental findings of FB correlations as well as predictions of different models, namely, Monte Carlo version of QGSM [22], Monte Carlo version of SFM [26], PYTHIA with different tunes [54][55][56], and PHOJET [57] which qualitatively or quantitatively described the data.…”

Section: Discussionsupporting

confidence: 88%

“…This dependence is in qualitative agreement with ALICE data [19]. The nonlinear dependence of b corr on δη has been explained in a simple model reported by ALICE collaboration [19], along with other approaches mentioned in [6,22,49,50]. The similar trend for both with and without hydro shows that the hydrodynamical evolution of the bulk matter has negligible effect on b corr as the SRC may be dominated due to eventby-event multiplicity fluctuations.…”

Section: Analysis Considering Alice Kinematicssupporting

confidence: 85%

“…Incipiently, the Dual Parton Model (DPM) [4,20] and the Quark Gluon String Model (QGSM) [21] came up with the prediction of the possible long-range correlations taking into account the multiple parton-parton interactions. The Monte Carlo version of the QGSM [22], which successfully described ALICE data in terms of FB correlation, showed that the superposition of different multistring processes with different mean multiplicities in pp collisions at various center-of-mass energies could be the source of FB correlations strength. The String Fusion Model (SFM) [23] investigated the long-range correlations with the idea of possible interactions between strings, highlighting different types of FB correlations as mentioned above [24].…”

Section: Introductionmentioning

confidence: 99%

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Forward-backward multiplicity and momentum correlations in $pp$ collisions at LHC energies

Mondal,

Kar

et al. 2020

Preprint

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Charged-particle multiplicity and summed values of the transverse momentum (pT) have been utilized for estimating forward-backward (FB) correlation strength for EPOS3 simulated protonproton (pp) events with and without hydrodynamical evolution of particles at center-of-mass energies √ s = 0.9, 2.76, and 7 TeV for different pseudorapidity window width (δη) and gap (ηgap) between the FB windows. We have studied the variation of FB correlation strength with ηgap, δη, √ s, pT cuts and multiplicity classes. Results are compared with the corresponding ALICE and ATLAS data. EPOS3 model qualitatively reproduces the overall variation of correlation strength of the LHC data. However, quantitative agreement is better for pp events, generated using EPOS3 with hydrodynamical evolution of particles, with ATLAS data.

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Section: Discussionsupporting

confidence: 88%

Section: Analysis Considering Alice Kinematicssupporting

confidence: 85%

Section: Introductionmentioning

confidence: 99%

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Forward-backward multiplicity and momentum correlations in $pp$ collisions at LHC energies

Mondal,

Kar

et al. 2020

Preprint

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“…In contrast, measurements in e + +e − collisions have reported a weak correlation [14,15]. This contrasting behaviour has attracted the attention of the theorists to understand the origin of b cor in small system [16][17][18][19][20][21][22][23].…”

Section: Introductionmentioning

confidence: 99%

Effect of color reconnection on forward-backward multiplicity and mean transverse momentum correlation

Kundu¹,

Mohanty²,

Mallick³

2019

Preprint

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Color reconnection (CR) mechanism in PYTHIA model has been reported to be essential to describe the flow-like collective effect observed in high multiplicity p+p and p+Pb collisions. In this work, we test this mechanism towards explaining the Forward-Backward multiplicity correlation (bcor) measurements in p+p collisions at the LHC energies. Out of the three different CR schemes implemented in PYTHIA, (a) MPI based CR (default mechanism), (b) QCD based CR and (c) Gluon moved CR, we found that the QCD based CR scheme describes relatively better the ALICE measurements of bcor in p+p collisions at √ s = 0.9 and 7 TeV. In addition, we have tuned the parameters of the default CR mechanism in PYTHIA to describe simultaneously the measured charged particle multiplicity pseudo-rapidity (η) distribution and bcor. We found that an average number of multipartonic interactions ( NMPI ) between 2.5 to 3 and CR range between 0.9 to 2.5 best describes the experimental data. Finally, we have presented a study using PYTHIA events for p+p collisions at √ s = 7 TeV which shows that the strength of Forward-Backward mean transverse momentum correlation (b

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“…Later it was realized [6][7][8][9] that the investigations of the FB correlations involving intensive observables in forward and backward observation windows, as e.g., the event-mean transverse momentum, enable to suppress the contribution of trivial "volume" fluctuations [10], originating from fluctuations in the number of initial sources (strings) and to obtain more clear signal on the process of string fusion, compared to usual FB multiplicity correlations.…”

Section: Introductionmentioning

confidence: 99%

Strongly Intensive Observables in the Model with String Fusion

Vechernin

Andronov

2019

Universe

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We calculate the strongly intensive observables for multiplicities in two rapidity windows in the model with independent identical strings taking into account the charge sign of particles. We express the observables through the string pair correlation functions describing the correlations between the same and opposite sign particles produced in a string decay. We extract these charge-wise string two-particle correlation functions from the ALICE data on the forward-backward correlations and the balance function. Using them we predict the behavior of the charge-wise strongly intensive observables in the model with independent identical strings. We also show that the observable between multiplicities in two acceptance windows separated in rapidity, which is a strongly intensive in the case with independent identical strings, loses this property, when we take into account string fusion effects and a formation of strings of a few different types takes place in a collision. We predict the changes in the behaviour of this observable with energy and collision centrality, arising due to the string fusion phenomena.

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On the origin of forward–backward multiplicity correlations in pp collisions at ultrarelativistic energies

Cited by 11 publications

References 56 publications

Forward-backward multiplicity and momentum correlations in $pp$ collisions at LHC energies

Forward-backward multiplicity and momentum correlations in $pp$ collisions at LHC energies

Effect of color reconnection on forward-backward multiplicity and mean transverse momentum correlation

Strongly Intensive Observables in the Model with String Fusion

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