Charged particle multiplicity correlations in pp̄ collisions at =0.3−1.8

Alexopoulos, T.; Allen, C.; Anderson, E. W.; Balamurali, V.; Banerjee, S.; Beery, P. D.; Bhat, P. C.; Bishop, J. M.; Biswas, N. N.; Bujak, A.; Carmony, D.D.; Carter, Thomas; Choi, Y.; Cole, P. L.; Debonte, R.; DeCarlo, V.A.; Erwin, A. R.; Findeisen, C.; Goshaw, A. T.; Gutay, L.; Hirsch, A. S.; Hojvat, C.; Jennings, J.; Kenny, V. P.; Lindsey, Clark S.; Loomis, C.; LoSecco, J. M.; McMahon, T.; McManus, A. P.; Morgan, N.; Nelson, K. S.; Oh, S. H.; Porile, N.; Reeves, D.; Rimai, A.; Robertson, W. J.; Scharenberg, R. P.; Stampke, S. R.; Stringfellow, B.; Thompson, M.; Turkot, F.; Walker, W. D.; Wang, C. H.; Warchol, J.; Wesson, D.; Zhan, Yang

doi:10.1016/0370-2693(95)00554-x

Cited by 47 publications

(20 citation statements)

References 13 publications

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“…Later on the linear dependence of the forward-backward (FB) correlations was also observed in pp andpp collisions at lower and higher energies, varying from p lab = 32 GeV/c ( √ s = 7.86 GeV) [7] and p lab = 250 GeV/c ( √ s = 22 GeV) [8] to c.m. energies 0.3 ≤ √ s ≤ 1.8 TeV [9]. At Large Hadron Collider (LHC), ALICE Collaboration has confirmed the linear rise of n B with increasing n F in pp collisions at √ s = 0.9, 2.76 and 7 TeV [10].…”

Section: Introductionmentioning

confidence: 99%

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

2018

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We study multiplicity correlations of hadrons in forward and backward hemispheres in pp inelastic interactions at energies 200 GeV ≤ √ s ≤ 13 TeV within the microscopic quark-gluon string model. The model correctly describes (i) the almost linear dependence of average multiplicity in one hemisphere on the particle multiplicity in other hemisphere in the center-of-mass frame; (ii) the increase of the slope parameter b corr with rising collision energy; (iii) the quick falloff of the correlation strength with increase of the midrapidity gap; (iv) saturation of the forward-backward correlations at very high multiplicities. Investigation of the sub-processes on partonic level reveals that these features can be attributed to short-range partonic correlations within a single string and superposition of several sub-processes containing different numbers of soft and hard Pomerons with different mean multiplicities. If the number of Pomerons in the event is fixed, no forward-backward correlations are observed. Predictions are made for the top LHC energy √ s = 13 TeV.

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Section: Introductionmentioning

confidence: 99%

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

2018

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“…When F B, we get the ridge from C s (N F , N B ), and when F C or B C, the function drops to zero for the reason discussed above Eq. (25). Note, however, that even when F , B, and C are all sufficiently separated, we get still an artifact from the presence of v s in the denominator of the second term in Eq.…”

Section: Results For the Simulated Eventsmentioning

confidence: 93%

“…Note, however, that even when F , B, and C are all sufficiently separated, we get still an artifact from the presence of v s in the denominator of the second term in Eq. (25). It leads to a reduction of the subtraction, and, consequently, larger values of C(S F , S B •S C ) in Fig.…”

Section: Results For the Simulated Eventsmentioning

confidence: 99%

“…Early investigations of pp and pp collisions [19][20][21][22][23][24][25] and nuclear collisions [26,27] were followed by the studies of ultra-relativistic heavy-ion and pp reactions at RHIC [2,28] and at the LHC [29][30][31][32][33][34][35]. Numerous physical models and theoretical methods have been invented in attempts to understand the mechanisms behind the generation of long-range correlations [3,12,17,18,.…”

Section: Forward-backward Multiplicity Correlationsmentioning

confidence: 99%

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Partial correlation analysis method in ultrarelativistic heavy-ion collisions

Olszewski

Broniowski

2017

Phys. Rev. C

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We argue that statistical data analysis of two-particle longitudinal correlations in ultra-relativistic heavy-ion collisions may be efficiently carried out with the technique of partial covariance. In this method, the spurious event-by-event fluctuations due to imprecise centrality determination are eliminated via projecting out the component of the covariance influenced by the centrality fluctuations. We bring up the relationship of the partial covariance to the conditional covariance. Importantly, in the superposition approach, where hadrons are produced independently from a collection of sources, the framework allows us to impose centrality constraints on the number of sources rather than hadrons, that way unfolding of the trivial fluctuations from statistical hadronization and focusing better on the initial-state physics. We show, using simulated data from hydrodynamics followed with statistical hadronization, that the technique is practical and very simple to use, giving insight into the correlations generated in the initial stage. We also discuss the issues related to separation of the short-and long-range components of the correlation functions, and show that in our example the short-range component from the resonance decays is largely reduced by considering pions of the same sign. We demonstrate the method explicitly on the cases where centrality is determined with a single central control bin, or with two peripheral control bins.PACS numbers: 25.75Gz, 25.75.Ld

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“…As is well known, the long-range rapidity correlations in hadronic collision experiments reveal information on the dynamics and evolution of the system in its earliest partonic phase. Experimentally, the multiplicity correlations in early pp and pp collisions [4][5][6][7][8][9] and nuclear collisions [10,11] were followed by the relativistic heavy-ion and pp experiments at RHIC [12][13][14] and the LHC [1,[15][16][17][18]. Physical pictures, models, and theoretical methods have been constructed along the quest to understand the data .…”

Section: Introductionmentioning

confidence: 99%

Forward--Backward Multiplicity Correlations at the LHC from Independent Sources

Olszewski¹,

Broniowski²

2017

Acta Phys. Pol. B

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It is argued that the superposition approach, where partons are independently emitted from longitudinally extended sources in the early stage, is fully compatible with the experimental results for the forward-backward multiplicity correlations in Pb+Pb collisions at √ s N N = 2.76 TeV. The pertinent correlation analysis is based on the PhD Thesis of Ref.[1], which includes an unpublished analysis of data taken by the ALICE Collaboration. Our calculations show that in the experimentally covered pseudorapidity range ∆η = 1.2, the initial sources in the backward and forward bins are maximally correlated, which complies to the string-like interpretation of the underlying early-stage production mechanism.

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Charged particle multiplicity correlations in pp̄ collisions at =0.3−1.8

Cited by 47 publications

References 13 publications

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

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

Partial correlation analysis method in ultrarelativistic heavy-ion collisions

Forward--Backward Multiplicity Correlations at the LHC from Independent Sources

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