https://doi.org/10.1051/epjconf/201713803010
Long-range rapidity correlations between mean transverse momenta
Saint Petersburg State University, 7/9 Universitetskaya nab., St.Petersburg, 199034 Russia
* e-mail: v.vechernin@spbu.ru
Published online: 27 March 2017
The forward-backward correlation strength between event-mean transverse momenta of particles produced in separated rapidity intervals in high energy hadronic collisions is analyzed in the simple model with the string fusion on a transverse lattice. The coefficient of long-range rapidity pt-pt correlation is obtained using the negative binomial distribution for the number of strings, which is closer to reality than the poissonian one. The results demonstrate good agreement with the asymptotes of the correlation coefficient analytically calculated earlier at large string density. It is observed that at LHC energy the pt-pt correlation coefficient reveals the drop for most central collisions. The model calculations show that the physical reason for this decrease is the attenuation of color field fluctuations due to the string fusion at large string density, whereas at RHIC energy the string density is not enough to provide a decline of the correlation coefficient for most central collisions.
© The Authors, published by EDP Sciences, 2017
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