Hadron production models’ prediction for pT distribution of charged hadrons in pp interactions at 7 TeV

摘要

The yield of transverse momentum (psubT/sub) spectra of integrated hadrons and their ratios produced in pp collisions at 7?TeV are reported using DPMJET-III, EPOS1.99, EPOS-LHC, HIJING1.383, QGSJETII-04, and Sibyll2.3c models. The models' predictions are compared with the ALICE measurements obtained at mid rapidity and in the psubT/sub range from 0.3-6?GeV/c, 0.2-6?GeV/c, and 0.1-3?GeV/c for protons, kaons and pions respectively. Compared to the experimental data, the EPOS1.99 and EPOS-LHC models predict the yield of pion very well while reproducing yields of kaon and proton at low psubT/sub only. The DPMJET-III model predicts the yield of pions, kaons and protons only at intermediate value of psubT/sub. The HIJING and Sibyll models describe the integrated yield of pion well at high psubT/sub only. The QGSJETII model predicts the yield of kaon for almost the whole psubT/sub range. EPOS1.99 and Sibyll models reproduce excellent prediction of the K/π ratio over the entire range of psubT/sub whereas the EPOS-LHC, HIJING and DPMJET models underpredict with increasing order of discrepancy respectively. The EPOS1.99, EPOS-LHC, and Sibyll models predict the p/π ratio for low values of psubT,/sub but overpredict at high values, while the DPMJET-III and HIJING models underpredict over the entire range of psubT/sub. Although the models' predictions are mostly consistent with the ALICE measurements but none of the models completely describe the entire distribution for the integrated yield of hadron and their ratios.