Abstract
The properties of the strongly intensive variable characterizing correlations between the number of particles in two separated rapidity interval in pp interactions at LHC energies are studied in the framework of the string fusion model. We perform the MC simulations of string distributions in the impact parameter plane to take into account the experimental conditions of pp collisions. We account the string fusion processes, leading to the formation of string clusters, embedding a finite lattice (a grid) in the impact parameter plane. As a result, we found the dependence of this variable both on the distance between the centers of the observation windows and their acceptance for the minbias pp collisions at several initial energies. Analyzing these dependencies we can extract the important information on the properties of string clusters. We show that in pp collisions at LHC energies the string fusion effects have a significant impact on the behavior of this strongly intensive variable. The role of these effects is increasing with the initial energy and centrality of collisions. In particular, we found that the increase of this variable with initial energy takes place due to the growth of the portion of the fused string clusters in string configurations arising in pp interactions.
Highlights
Introduction the string model [1, 2] has become a standard approach for the description of the soft part of hadronic interactions at high energies
For the Monte-Carlo generation of the string configurations arising in pp collision we have used the approach developed earlier in the paper [18]
We took into account the string fusion processes leading to the formation of string clusters, embedding the finite lattice in transverse plane
Summary
The string (color flux tubes) model [1, 2] has become a standard approach for the description of the soft part of hadronic interactions at high energies. Back in the work [7] it was shown that the traditional FB correlation coefficient between the charge particle multiplicities, nF and nB, in the observation rapidity windows strongly depends on the event-by-event variance of the number of cut pomerons (strings) in pp collisions, i.e. on the so-called “volume” fluctuation - the trivial fluctuation in the number of sources From this point of view it is desirable to search for another observables, which is not sensitive to the fluctuation in the number of sources (strings), but is sensitive to the fluctuation of the properties of sources, e.g. to the formation of string clusters by string fusion processes. Given the possibility of the formation of sources of different types the observable Σ(nF , nB) becomes equal to the weighted average of the ones for different string clusters with weights, αη, which depend on the details of the collision - the initial energy and centrality of the collision
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