scholarly journals A Comparative Study of K±/π± Ratio in Proton-Proton Collisions at Different Energies: Experimental Results versus Model Simulation

2018 ◽  
Vol 2018 ◽  
pp. 1-7 ◽  
Author(s):  
Swarnapratim Bhattacharyya ◽  
Maria Haiduc ◽  
Alina Tania Neagu ◽  
Elena Firu
Keyword(s):  
Experimental Data ◽  
Comparative Study ◽  
Model Simulation ◽  
Experimental Results ◽  
Pp Collisions ◽  
Proton Proton ◽  
Proton Collisions ◽  
Versus Model ◽  
Pion Multiplicity ◽  
Proton Proton Collisions

A detailed study of energy dependence of K+/π+, K-/π- and total kaon to pion multiplicity ratio K++K-/π++π-=K/π has been carried out in proton-proton (pp) collisions at s=6.3, 17.3, 62.4, 200, and 900 GeV and also at s=2.76 TeV and 7 TeV in the framework of UrQMD and DPMJET III model. Dependence of K+/π+ and K-/π- on energy shows different behavior for UrQMD and DPMJET III model. The presence of the horn-like structure in the variation of K+/π+ and K-/π- with energy for the experimental data is supported by the DPMJET III model. Experimentally it has been observed that as energy increases, the total kaon to pion multiplicity ratio K++K-/π++π-=K/π increases systematically for pp collisions at lower energies and becomes independent of energy in LHC energy regime. Our analysis on total kaon to pion multiplicity ratio K++K-/π++π-=K/π with UrQMD data is well supported by the experimental results obtained by different collaborations in different times. In case of DPMJET III data, the saturation of K/π ratio at LHC region has not been observed.

scholarly journals Forward backward multiplicity correlations: a tool to study properties of the proton-proton collisions

2018 ◽  
Vol 172 ◽  
pp. 05008 ◽  
Author(s):  
Edgar Dominguez-Rosas ◽  
Eleazar Cuautle Flores
Keyword(s):  
Experimental Data ◽  
Hadron Production ◽  
Event Generator ◽  
Proton Proton ◽  
Proton Collisions ◽  
Electron Positron ◽  
Color Reconnection ◽  
Proton Proton Collisions ◽  
Production Mechanisms ◽  
Reconnection Model

Forward-backward multiplicity correlations have been used to study hadron production mechanisms in electron-positron, proton-proton and more recently in leadlead collisions. The experimental results on this correlations and its comparison to different models reveals an incomplete agreement. In this work, we present an study of forward backward multiplicity correlations in proton-proton collisions using PYTHIA event generator, at LHC energies. Detailed analysis is presented in the case of soft and hard QCD processes, incorporating color reconnection model as part of hadronization mechanism and multiple parton interactions effects in the correlations. Our results and its comparison to available experimental data suggest that this kind of correlations are great tools to characterize the events and gives the possibility to disentangle phenomena in hard and soft QCD processes.

Models prediction of hadrons production ratios in pp collisions at s = 7 TeV

2019 ◽  
Vol 34 (13) ◽  
pp. 1950090 ◽  
Author(s):  
M. Ajaz ◽  
M. Bilal ◽  
Y. Ali ◽  
M. K. Suleymanov ◽  
K. H. Khan
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Charged Particles ◽  
Hadron Production ◽  
Proton Proton ◽  
Proton Collisions ◽  
Particle Ratios ◽  
Production Models ◽  
Lhcb Detector ◽  
Proton Proton Collisions

The pseudorapidity [Formula: see text] dependence of charged-particles ratios in three transverse momentum [Formula: see text] regions, obtained by hadron production models, in proton–proton collisions at 7 TeV are compared with the measurements of LHCb detector. Compared to the experimental data, the [Formula: see text] ratios are independent of [Formula: see text] and [Formula: see text] and are very well predicted by all models (DPMJETIII, EPOS1.99, EPOS-LHC, HIJING1.383, QGSJETII-04 and Sibyll2.3c). All models predict the [Formula: see text] ratio at low [Formula: see text] for [Formula: see text], but underestimate afterward while reproducing the experimental data at medium and high [Formula: see text] very well. The [Formula: see text] ratio is described by the models very well at high [Formula: see text] in the low and medium [Formula: see text] region. At high [Formula: see text], models predict the experimental data well, except Sibyll2.3c that slightly overestimates. The [Formula: see text] ratio is predicted by EPOS1.99, HIJING and Sibyll at low [Formula: see text] and EPOS-LHC, EPOS1.99 and Sibyll predicted at high [Formula: see text] for low [Formula: see text]. For medium [Formula: see text], EPOS1.99 and Sibyll predict very well for [Formula: see text] while EPOS-LHC and HIJING models reproduce the data for [Formula: see text]. All models underpredict the [Formula: see text] ratio for [Formula: see text]. For the [Formula: see text] and [Formula: see text] ratios, only Sibyll and EPOS1.99 models could reproduce some regions of [Formula: see text] and [Formula: see text]. None of the models satisfactorily predict all the ratios. the same particle ratios are well described by most of the models while the discrepancies occur mostly in predicting the different particles ratios.

scholarly journals Tensor pomeron, vector odderon and diffractive production of meson and baryon pairs in proton-proton collisions

2019 ◽  
Vol 206 ◽  
pp. 06005 ◽  
Author(s):  
Piotr Lebiedowicz ◽  
Otto Nachtmann ◽  
Antoni Szczurek
Keyword(s):  
Experimental Data ◽  
High Energy ◽  
Proton Proton ◽  
Proton Collisions ◽  
High Energies ◽  
Energy Proton ◽  
Diffractive Production ◽  
Proton Proton Collisions ◽  
Theoretical Results ◽  
The Continuum

We review some selected results of the tensor-pomeron and vectorodderon model of soft high-energy proton-proton scattering and central exclusive production of meson and baryon pairs in proton-proton collisions. We discuss the theoretical aspects of this approach and consider the phenomenological implications in a variety of processes at high energies, comparing to existing experimental data. We consider the diffractive dipion and dikaon production including the continuum and the dominant scalar and tensor resonance contributions as well as the photoproduction processes. The theoretical results are compared with existing CDF experimental data and predictions for planned or current LHC experiments, ALICE, ATLAS, CMS, LHCb are presented.

Distribution of strange particles transverse momentum and rapidity in high energy proton–proton collisions at s = 0.9 TeV at LHC

2019 ◽  
Vol 35 (05) ◽  
pp. 2050006
Author(s):  
Q. Ali ◽  
Y. Ali ◽  
U. Tabassam ◽  
M. Haseeb ◽  
M. Ikram
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Simulation Models ◽  
High Energy ◽  
Rapidity Distribution ◽  
Proton Proton ◽  
Proton Collisions ◽  
Strange Particles ◽  
Good Comparison ◽  
Proton Proton Collisions

In this paper, we have studied the spectra of strange particles in pp collision at [Formula: see text] = 0.9 TeV by using different simulation models, EPOS-1.99, SIBYLL-2.3c, QGSJETII-04 and EPOS-LHC. The transverse momentum and rapidity distribution in the [Formula: see text] range of [Formula: see text] GeV/c and [Formula: see text] GeV/c, respectively, are investigated for the strange particles, [Formula: see text], [Formula: see text], [Formula: see text]. Similarly, a comparative study is done for the ratio of [Formula: see text] and [Formula: see text] as a function of transverse momentum and rapidity. The validity of simulation models is tested by comparing simulation results to the CMS experimental data at [Formula: see text] = 0.9 TeV. For [Formula: see text] distributions, the EPOS-LHC model in the [Formula: see text] range [Formula: see text] GeV/c, [Formula: see text] GeV/c and in [Formula: see text] GeV/c while EPOS-1.99 model in the [Formula: see text] range [Formula: see text] GeV/c and QGSJETII-04 model in the [Formula: see text] range [Formula: see text] GeV/c as well as, [Formula: see text] GeV/c explain the experimental data well. For the, [Formula: see text] and [Formula: see text] versus transverse momentum distributions, EPOS-LHC model in the [Formula: see text] range of, [Formula: see text] GeV/c and [Formula: see text] GeV/c, EPOS-1.99 model in the [Formula: see text] range, [Formula: see text] GeV/c, SIBYLL-2.3c model in the [Formula: see text] range, [Formula: see text] GeV/c and QGSJETII-04 model in the [Formula: see text] range [Formula: see text] GeV/c explain the experimental data very well. Similarly, for [Formula: see text] and [Formula: see text] versus rapidity distribution QGSJETII-04 predictions in the rapidity region, [Formula: see text], [Formula: see text], and [Formula: see text], while EPOS-LHC model in the region, [Formula: see text], very well explained the experimental data. Although good comparison of the models predictions with the experimental data is observed, none of them completely describe the experimental data the spectra of strange particles over the entire [Formula: see text] and [Formula: see text] range.

scholarly journals SOFT RIDGE IN PROTON–PROTON COLLISIONS

2011 ◽  
Vol 26 (13) ◽  
pp. 963-966 ◽  
Author(s):  
M. YU. AZARKIN ◽  
I. M. DREMIN ◽  
A. V. LEONIDOV
Keyword(s):  
Degrees Of Freedom ◽  
Multiparticle Production ◽  
Pp Collisions ◽  
Proton Proton ◽  
Proton Collisions ◽  
Ridge Structure ◽  
Angular Correlations ◽  
Proton Proton Collisions

It is shown that the soft mechanism of multiparticle production by Lund hadronic strings formed by colliding constituent degrees of freedom generates a shape of angular correlations similar to the ridge structure observed in the pp collisions at 7 TeV at the LHC.

scholarly journals Baryon number in proton-proton and proton-nucleus high energy collisions

2021 ◽  
Vol 136 (9) ◽  
Author(s):  
Marek Jeżabek ◽  
Andrzej Rybicki
Keyword(s):  
Experimental Data ◽  
Baryon Number ◽  
Parton Model ◽  
High Energy ◽  
Proton Proton ◽  
Carbon Target ◽  
Proton Collisions ◽  
Baryon Stopping ◽  
Proton Proton Collisions ◽  
Made In

AbstractNew analyses of baryon spectra in proton-proton and proton-carbon collisions at $$\sqrt{s}_\mathrm {_{NN}}=17.3$$ s NN = 17.3 GeV, made in the framework of two phenomenological models are presented. The first model in question is the classic Dual Parton Model by Capella and Tran Thanh Van, the second is the Gluon Exchange Model very recently proposed by the authors. For both studies, the usage of modern experimental data from the CERN SPS eliminates several of the most important limitations inherent to earlier studies of this type. In both studies, the standard mechanism of baryon stopping with preservation of the diquark, proposed by Capella and Tran Thanh Van fails to describe the distribution of non-strange baryons in collisions of the projectile proton with more than one nucleon from the carbon target obtained from experimental data, and the upper limit for the contribution of this mechanism can be established. In both cases, the conclusion is that the projectile diquark must be very often disintegrated. This opens new diagrams not available in proton-proton collisions which lead to the transport of baryon number over long distances in rapidity. The present limitations, and possibility of improvement in both approaches are discussed. The implications of our findings for new measurements are addressed, in particular using antiproton beams.

scholarly journals String percolation in AA and p+p collisions

2019 ◽  
Vol 65 (3) ◽  
pp. 197 ◽  
Author(s):  
I. Bautista ◽  
C. Pajares ◽  
And J.E. Ramírez
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Density Ratio ◽  
Entropy Density ◽  
Pp Collisions ◽  
Proton Proton ◽  
Ridge Structure ◽  
Strangeness Enhancement ◽  
Bose Einstein ◽  
Proton Proton Collisions

A brief review of the string percolation model and its results are presented together with the comparison to experimental data. First, it is done an introduction to the quark-gluon phase diagram and the lattice results concerning the connement and the percolation of center domains. It is studied the interaction of the strings produced in nucleus-nucleus and proton-proton collisions showing how the string percolation arises. The main consequences of the string percolation, concerning the dependence on the energy and centrality, on the multiplicities and the mean transverse momentum are obtained comparing with experimental data. It is emphasized the non-abelian character of the color eld of the strings forming the cluster to reproduce the rise of the transverse momentum with multiplicity and the relative suppression of multiplicities. It is also studied dierent observables like multiplicity and transverse momentum distributions, dependence with multiplicity and transverse momentum correlations, forward-backward correlations, the strength of the Bose-Einstein correlations, dependence on the multiplicity of J/ψ  production and its possible suppression in pp collisions at high multiplicity, strangeness enhancement, elliptic ow, and ridge structure. The comparison with the data shows an overall agreement. The thermodynamical properties of the extended cluster formed in the collision are discussed computingits energy and entropy density, shear viscosity over entropy density ratio, bulk viscosity, sound speed and trace anomaly as a function of temperature, showing a remarkable agreement with lattice QCD evaluations. The string percolation can be regarded as the initial frame able to describe the collective behavior produced in AA and pp collisions.

Forward neutron energy spectra at s = 7TeV

2020 ◽  
Vol 29 (07) ◽  
pp. 2050049
Author(s):  
Rashid Khan
Keyword(s):  
Experimental Data ◽  
Neutron Energy ◽  
Center Of Mass ◽  
Energy Spectra ◽  
Mass Energy ◽  
Proton Proton ◽  
Proton Collisions ◽  
Center Of Mass Energy ◽  
Energy Formula ◽  
Proton Proton Collisions

Different event generators are used to simulate proton–proton collisions at the center-of-mass energy [Formula: see text] TeV to predict the forward neutron energy spectra. The predictions from different models — DPMJETIII, Sibyll2.3c, QGSJETII-04 and EPOS-LHC — are compared with experimental data from the LHCf detector in three different regions of pseudorapidity — [Formula: see text], [Formula: see text] and [Formula: see text]. Although, the models follow tracks of the experimental data, there is a clear mismatch between the models and experimental data, and among the models as well.

PROCESS DEPENDENCE AND THE SIVERS EFFECT IN INCLUSIVE AND SEMI-INCLUSIVE REACTIONS

2014 ◽  
Vol 25 ◽  
pp. 1460018
Author(s):  
LEONARD GAMBERG ◽  
ZHONG-BO KANG ◽  
ALEXEI PROKUDIN
Keyword(s):  
Experimental Data ◽  
Spin Asymmetry ◽  
Initial State ◽  
Final State ◽  
Proton Proton ◽  
Proton Collisions ◽  
Asymmetry Data ◽  
Final State Interactions ◽  
Inclusive Jet Production ◽  
Proton Proton Collisions

We perform an analysis of the the spin asymmetry for single inclusive jet production in proton-proton collisions collected by AnDY experiment and the Sivers asymmetry data from semi-inclusive deep inelastic scattering experiments. In particular, we consider the role color gauge invariance plays in determining the process-dependence of the Sivers effect. We find that after carefully taking into account the initial-state and final-state interactions between the active parton and the remnant of the polarized hadron, the calculated jet spin asymmetry based on the Sivers functions extracted from HERMES and COMPASS experiments is consistent with the AnDY experimental data. This provides a first indication for the process-dependence of the Sivers effect in different processes. We also make predictions for both direct photon and Drell-Yan spin asymmetry, to further test the process-dependence of the Sivers effect in future experiments.

scholarly journals Prediction of the particle production in pp collisions with the MPD detector at NICA collider

2019 ◽  
Vol 204 ◽  
pp. 07005
Author(s):  
K. Shtejer
Keyword(s):  
Monte Carlo ◽  
Particle Production ◽  
Simulated Data ◽  
Pp Collisions ◽  
Proton Proton ◽  
Proton Collisions ◽  
Particle Ratios ◽  
Particle Yield ◽  
Proton Proton Collisions ◽  
Nica Collider

The proton-proton collisions have been extensively used as a baseline reference for nucleus-nucleus collisions. In this work, Monte Carlo simulations of inelastic head-on pp interactions at $\sqrt s = 6 - 25\,{\rm{GeV}}$ were performed to study the possibilities of the Multi–Purpose Detector (MPD) to register data from small systems at the energy range of NICA. For that purpose the Monte Carlo models EPOS 1.99 and UrQMD 3.4 were used as event generators to analyse the charge particle yield from pp collisions in the framework of MpdRoot. The production of protons, pions and kaons from pp collisions was studied through their mean multiplicity, rapidity spectra and particle ratios as function of the collision energy. The yield of Λ hyperons was also estimated by means of pure Monte Carlo and the reconstruction of the simulated data in MPD. The comparison with recent data from NA61/SHINE experiment is presented.

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