Model studies of $$V^0$$ production ratios in pp collisions at $$\sqrt{\textrm{s}} = 0.2, 0.9$$, and 7 TeV

Ajaz, M.; Ashraf, M. U.; Waqas, M.; Yasin, Z.; Khubrani, Ahmed M.; Hassan, Syed Imran; Ismail, A. Haj; Li, L. L.

doi:10.1140/epjp/s13360-022-03603-9

Cited by 6 publications

(2 citation statements)

References 43 publications

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“…Such parameters are key observables to distinguish general properties of the collision that are more significant for higher collision energies [ 7 , 8 ]. Similar studies showing models’ prediction compared to experimental data at different energies are given in the references [ 9 , 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 , 19 , 20 ]. The data at 0.9 and 2.36 TeV are taken from [ 4 ] and 7 TeV from [ 5 ].…”

Section: Introductionsupporting

confidence: 59%

Charged Particles Transverse Momentum and Pseudorapidity Distribution in Hadronic Collisions at LHC Energies

Ajaz

Ismail

Mian

et al. 2023

Entropy

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We present an analysis of the pseudorapidity η and transverse momentum pT distributions of charged hadrons in pp collisions for the kinematic range of 0<pT<4 GeV/c and |η|<2.4 at 0.9, 2.36, and 7 TeV. Charged particles are produced in pp collision using several Monte Carlo event generators (Pythia Simple, Vincia, Dire showers, Sibyll2.3d, QGSJETII-04, EPOS-LHC) and compared with CMS data at LHC. It is observed that the Simple parton showers can explain the CMS data very well for pT>1 GeV/c at 0.9 and 2.36 TeV within the experimental errors, while Dire overshoots and Vicia undershoots the data by 50% each. At 7 TeV, the Dire module presents a good prediction, whereas the Simple and Vincia modules underestimate the data within 30% and 50%. Comparing the Simple module of the Pythia model and the predictions of the CRMC models with the experimental data shows that at 0.9 TeV, EPOS-LHC has better results than the others. At 2.36 GeV, the cosmic rays Monte Carlo (CRMC) models have better prediction than the Simple module of Pythia at low pT, while QGSJETII-04 predicts well at high pT. QGSJETII-04 and EPOS-LHC have closer results than the Pythia-Simple and Sibyll2.3d at 7 TeV. In the case of the pseudorapidity distributions, only the Pythia-Simple reproduced the experimental measurements at all energies. The Dire module overestimates, while Vincia underestimates the data in decreasing order of discrepancy (20%, 12%, 5%) with energy. All CRMC models underestimate the data over the entire η range at all energies by 20%. The angular ordering of partons and the parton fragmentation could be possible reasons for this deviation. Furthermore, we used the two-component standard distribution to fit the pT spectra to the experimental data and extracted the effective temperature (Teff) and the multiplicity parameter (N0). It is observed that Teff increases with the increase in the center of mass energy. The fit yielded 0.20368±0.01, 0.22348±0.011, and 0.24128±0.012 GeV for 0.9, 2.36, and 7 TeV, respectively. This shows that the system at higher energies freezes out earlier than lower ones because they quickly attain the equilibrium state.

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Section: Introductionsupporting

confidence: 59%

Charged Particles Transverse Momentum and Pseudorapidity Distribution in Hadronic Collisions at LHC Energies

Ajaz

Ismail

Mian

et al. 2023

Entropy

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“…For our calculations, we used the QGSJET II-04 [28] model, based on the ideologies of quark-gluon strings and quantum chromodynamics, which explain the generation of hard hadron jets with significant transverse momenta. The model has demonstrated promising outcomes in measuring hadron production at accelerator energies [28][29][30][31].…”

Section: Simulation Of Nucleus-initiated Eas Developmentmentioning

confidence: 99%

First Results of Studying EAS Cores Using a High-Mountain Ionization Calorimeter

Sadykov,

Mukhamedshin,

Galkin

et al. 2023

Particles

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In high-altitude experiments to study the central cores of EAS at E0 ≳ 1016 eV (√s ≳ 5 TeV) using X-ray emulsion chambers and ionization calorimeters, phenomena such as the coplanarity of the arrival of the most energetic particles in super families of γ-rays and hadrons and a so-called Tien Shan effect (too slow absorption of cascades initiated by high-energy hadrons in the calorimeter) were observed. These effects could not be reproduced within the framework of theoretical models of the 80s and 90s. The coplanarity is explained via a process of coplanar generation of the most energetic secondary particles in interactions of super high-energy hadrons with nuclei of air atoms. Perhaps the Tien Shan effect could be explained using a high cross section for the generation of fragmentation-region charmed hadrons. To study these phenomena, a new set of detectors has been developed, including the world’s highest high-mountain ionization calorimeter, “Hadron-55”. This paper presents the initial experimental results.

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Transverse momentum distributions of the identified particles in mini–bias non-single diffracted p＋p collisions at 200 GeV

Waqas,

Alrebdi,

Ajaz

et al. 2024

Chinese Journal of Physics

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Model studies of $$V^0$$ production ratios in pp collisions at $$\sqrt{\textrm{s}} = 0.2, 0.9$$, and 7 TeV

Cited by 6 publications

References 43 publications

Charged Particles Transverse Momentum and Pseudorapidity Distribution in Hadronic Collisions at LHC Energies

Charged Particles Transverse Momentum and Pseudorapidity Distribution in Hadronic Collisions at LHC Energies

First Results of Studying EAS Cores Using a High-Mountain Ionization Calorimeter

Transverse momentum distributions of the identified particles in mini–bias non-single diffracted p＋p collisions at 200 GeV

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