#### 1. Introduction

The spatio–temporal structures of particle emitting source in high-energy collisions are essentially defined by the dynamics of the collision processes [1]. The femtoscopy method allows to measure the spatial and temporal characteristics of emitting region in high-energy collisions. Such correlations arise from the quantum statistics, Coulomb and strong final state interactions.

In small system collisions, such as p+p collisions, Bose-Einstein correlations can be distorted by non-femtoscopic effects, for example, due to the correlations that caused by energy-momentum conservation laws, jets and mini-jets.

In this proceeding, estimation of jets (mini-jets) contribution to the correlation function
of pions and kaons in p+p

#### 2. Femtoscopy

The method of femtoscopy is created to measure the space-time extents
of the particle emitting region at kinetic freeze-out. It is based on
measurements of identical particle quantum statistical correlations. The
femtoscopic correlations are calculated as a function of relative
momentum, expressed as

(1)
where

One can study the dynamics of the collision evolution via measurement of the
pair transverse momentum (

#### 3. Results and Discussions

For estimation of non-femtoscopic effects the HIJING and PYTHIA with Perugia 2011 (no color reconnection) and Perugia 2012 tunes were used.

The PYTHIA program is a standard tool for the generation of events in
high-energy collisions between elementary particles, comprising a
coherent set of physics models for the evolution from a few-body
hard-scattering process to a complex multiparticle final state.
The HIJING is a Monte Carlo event generator is designed in particular to
study jet and mini-jet production and associated particle production in
high energy p+p, p+A and A+A collisions.
The HIJING generator was running in the jet trigger mode with the
transverse momentum
of hard and semi-hard scattering of

In Fig. 2 one can see the calculated two-kaon and
two-pion correlation functions at different

It is seen that HIJING and PYTHIA shows similar contribution of jets
(mini-jets) to the correlation functions of pions and kaons.
At low

The collision system dependence of the non-femtoscopic effects and especially jets and mini-jets contribution to the correlation function is also very important. Fig. 3 shows the two-pion and two-kaon correlation functions in p+Au collisions at 200 GeV obtained from the HIJING generator.

One can see that at high

#### 4. Conclusions

The HIJING 1.383 and PYTHIA 6.4.28 is used to estimate the correlation functions
of like-sign pions and like-sign kaons in p+p collisions at

#### Acknowledgments

The reported study was funded by RFBR according to the research project No. 16-02-01119 a. This work was partially supported by the Ministry of Science and Education of the Russian Federation, grant N 3.3380.2017/4.7, and by the National Research Nuclear University MEPhI in the framework of the Russian Academic Excellence Project (contract No. 02.a03.21.0005, 27.08.2013).