On the origin of forward–backward multiplicity correlations in pp collisions at ultrarelativistic energies
| Autor: | Larissa Bravina, J. Bleibel, Evgeny Zabrodin |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Nuclear and High Energy Physics
Nuclear Theory Hadron FOS: Physical sciences Forward backward 01 natural sciences High Energy Physics - Experiment Nuclear physics Nuclear Theory (nucl-th) Superposition principle High Energy Physics - Experiment (hep-ex) High Energy Physics - Phenomenology (hep-ph) 0103 physical sciences 010306 general physics Nuclear Experiment Nuclear theory Physics Large Hadron Collider 010308 nuclear & particles physics High Energy Physics::Phenomenology Multiplicity (mathematics) Collision lcsh:QC1-999 High Energy Physics - Phenomenology High Energy Physics::Experiment lcsh:Physics |
| Zdroj: | Physics Letters B, Vol 787, Iss, Pp 146-152 (2018) Physics Letters |
| ISSN: | 0370-2693 |
| Popis: | 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 centre-of-mass frame; (ii) the increase of the slope parameter bcorr 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. |
| Databáze: | OpenAIRE |
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