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In PYTHIA6 (PYTHIA8) once the transverse momentum $p_T$ of a generatedparticle is randomly sampled, $p_x$ and $p_y$ are set on the circle with radiusof $p_T$ randomly. This may largely suppress the development of the finalhadronic state transverse momentum anisotropy from the initial state spatialasymmetry. We modify PYTHIA6.4 by randomly setting $p_x$ and $p_y$ on thecircumference of an ellipse with the half major and minor axes being$p_T(1+\delta_p)$ and $p_T(1-\delta_p)$, respectively. The modified PYTHIA6.4is then employed to systematically study the charged particle transversemomentum asymmetry in the minimum bias pp collisions at $\sqrt s$=0.9, 7, and14 TeV. The ALICE data on the transverse sphericity as a function of chargedmultiplicity, $<S_T>(N_{ch})$, are well reproduced with the modified PYTHIA6.4.It is found that the predicted charged particle $v_2$ upper limit is ameasurable value, $\sim 0.12$, in the minimum bias pp collisions at $\sqrt s$=7TeV. We suggest a systematic measurement for the particle transverse momentumsphericity, eccentricity (ellipticity), and elliptic flow parameter.

Systematic study for particle transverse momentum asymmetry in minimum bias pp collisions at LHC energies