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Abstract
In this work, from the experimental data we evaluate the first C-moments of the multiplicity distributions recently measured in proton-proton collisions at the LHC and compare them with the predictions of two models: the Kharzeev-Levin model and the Bialas-Praszalowicz model. We divide the data into three sets according to their phase space coverage: I: $p_T > 100 $ MeV and $|\eta|< 0.5$; II: $p_T > 100 $ MeV and $|\eta|< 2.4$ and II: $p_T > 500 $ MeV and $|\eta|< 2.4$. The mean multiplicity grows with the energy according to a power law and the power is different for each set. The $C_n$ moments grow continuously with the energy, slowly in set I and faster in the other sets. Except for KL in set II, both models reproduce the main features of the data. The negative binomial parameter $k$ decreases continuously with the energy and there is no sign of change in this behavior.
Highlights
Particle production in hadronic collisions at very high energies is a very interesting phenomenon
In [2] it was shown that these generators are able to reproduce the main features of the multiplicity distributions but they are not yet able to describe the data with precision, especially in the large multiplicity region
One of the most interesting predictions of the color glass condensate (CGC) is that at very high energies the multiplicity distributions will become narrower [4]. This may be observed looking at the behavior of the multiplicity moments Cn, which should decrease with the energy
Summary
Particle production in hadronic collisions at very high energies is a very interesting phenomenon. One of the most interesting predictions of the CGC is that at very high energies the multiplicity distributions will become narrower [4]. This may be observed looking at the behavior of the multiplicity moments Cn, which should decrease with the energy. Ten years ago this prediction was confronted with the LHC data in [5], where a careful study of the moments was carried out.
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