Possible influence of the two string events on the hadron formation in a nuclear environment

Abstract

One of the basic assumptions of the string model is that as a result of a DIS in nucleus a single string arises, which then breaks into hadrons. However the pomeron exchange considered in this work, leads to the production of two strings in the one event. The hadrons produced in these events have smaller formation lengths, than those with the same energy produced in the single string events. As a consequence, they undergo more substantial absorption in the nuclear matter.

Study of the hadronization process in cold nuclear medium

“…The string can break down into two strings according to the following scenarios. First, when the quarkantiquark pair from the color field of the string is produced; and second, when the color interaction between the string and the nucleon (lying on its trajectory) has happened (see for instance [12,18]). In the "history" of the string there are two time scales which are of interest for us.…”

“…In the above formula more variables like the photon virtuality-Q 2 , transverse hadron momentum in respect to the virtual photon direction-p t , over which the NA is averaged, are not written. At present, several phenomenological models for description of the NA [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] are available. The simple version of the string model, so called TwoScale Model (TSM), was proposed by European Muon Collaboration for the description of its experimental data [2].…”

Formation lengths of hadrons in lepto-production

“…The possible influence of the two string mechanism was studied in Ref. [1], in which its contribution was determined to be small. Another important issue is the selection of conditions under which cascading processes in a nucleus do not occur, i.e., the hadronization occurs beyond the nucleus.…”