Independent pair parton interactions model of hadron interactions

Abstract

A model of independent pair parton interactions is proposed, according to which, hadron interactions are represented by a set of independent binary parton collisions. The final multiplicity distribution is described by a convolution of the negative binomial distributions in each of the partonic collisions. As a result, it is given by a weighted sum of negative binomial distributions with parameters multiplied by the number of active pairs. Its shape and moments are considered. Experimental data on multiplicity distributions in high energy pp processes are well fitted by these distributions. Predictions for the CERN Large Hadron Collider and higher energies are presented. The difference between e + e − and pp processes is discussed.

Searching for a hidden sector in multiparticle production at LHC

“…q moments up to q = 16 in pp collisions at 1.8 TeV obtained in this work using expressions for a 2-step cascade and the same parameters as in [5,6]. Very good agreement is found with their results and experimental data [17], shown by circles with error bars.…”

“…The IPPI model [5,6] was proposed in order reproduce the moments of multiplicity distributions in pp collisions at high energy with minimum adjustable parameters. The IPPI picture corresponds to a simplified 2-step scenario: parton binary collisions become seeds of independent cascades which hadronize (e.g.…”

“…Correspondingly, the average multiplicity can be written as n = N s m (1) according to a 2-step description of multiparticle production. On the other hand, the authors of [5,6] benefit from a dramatic reduction of free parameters when assuming a weighted superposition of NBDs with shifted parameters, as can be seen in Eq.(4). In addition, since m (1) should be the same for any value of the rank q, only k (1) remains a free parameter (w max was determined using a particular model).…”

“…In order to make a comparison of the results of the current study and those from [5,6], below we assume that all P (1) (n i ) are NBDs. Moreover, P(N s ) and w j distributions can be formally identified.…”

“…In this work we study the effects of a new physics contribution on the conventional parton cascade. To this end, we extend the phenonemological approach of the Independent Pair Parton Interaction (IPPI) model [5,6] including an extra step of a hypothetical new stage of matter associated with HS.…”