scholarly journals A Study of Transverse Momentum Distributions of Jets Produced inp-p,p-p-,d-Au, Au-Au, and Pb-Pb Collisions at High Energies

2015 ◽  
Vol 2015 ◽  
pp. 1-17
Author(s):  
Hua-Rong Wei ◽  
Fu-Hu Liu
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Thermal Model ◽  
Erlang Distribution ◽  
High Energies ◽  
Two Component ◽  
Momentum Distributions ◽  
Interacting Systems ◽  
Strong Scattering ◽  
Good Agreement

The transverse momentum distributions of jets produced inp-p,p-p-,d-Au, Au-Au, and Pb-Pb collisions at high energies with different selected conditions are analyzed by using a multisource thermal model. The multicomponent (mostly two-component) Erlang distribution used in our description is in good agreement with the experimental data measured by the STAR, D0, CDF II, ALICE, ATLAS, and CMS Collaborations. Related parameters are extracted from the transverse momentum distributions and some information on different interacting systems is obtained. In the two-component Erlang distribution, the first component has usually two or more sources which are contributed by strong scattering interactions between two quarks or more quarks and gluons, while the second component has mostly two sources which are contributed by harder head-on scattering between two quarks.

Transverse momentum and nuclear modification factor distributions of charged particles in p + Pb and p+p collisions at s NN = 5.02 TeV

2019 ◽  
Vol 34 (16) ◽  
pp. 1950120 ◽  
Author(s):  
Q. Ali ◽  
Y. Ali ◽  
M. Haseeb ◽  
M. Ajaz
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Charged Particles ◽  
Momentum Range ◽  
Nuclear Modification Factor ◽  
Nuclear Modification ◽  
Model Distribution ◽  
Momentum Distributions ◽  
Modification Factor ◽  
Good Agreement

Transverse momentum distributions and nuclear modification factor of integrated charged particles yield produced in p[Formula: see text]+[Formula: see text]Pb collisions at [Formula: see text] = 5.02 TeV are investigated in mid-rapidity regions of [Formula: see text] at one event multiplicity class 0–5% in the transverse momentum range of [Formula: see text]20 GeV/c. Simulations with EPOS-1.99, EPOS-LHC and QGSJETII-04 are compared with the ALICE data. All three models are in good agreement with each other up to [Formula: see text]3 GeV/c for transverse momentum distributions but after that QGSJETII-04 overpredicts the experimental data. EPOS-LHC seems to describe the experimental data quite well as compared to the other two models. The ratios of the kaons to pions and protons to pions are also presented where again EPOS-LHC provides good agreement with the ALICE data. In case of the nuclear modification factor, for (anti) pions and (anti) kaons, the model distribution is around 1, whereas it is greater than 1 in case of (anti) protons which shows Cronin enhancement.

scholarly journals Productions of J/ψ mesons in p-Pb collisions at 5 TeV

2016 ◽  
Vol 25 (06) ◽  
pp. 1650036 ◽  
Author(s):  
Fu-Hu Liu ◽  
Hai-Ling Lao ◽  
Roy A. Lacey
Keyword(s):  
Experimental Data ◽  
Thermal Model ◽  
Center Of Mass ◽  
Erlang Distribution ◽  
Nucleon Pair ◽  
Mass Energy ◽  
Exponential Distributions ◽  
Center Of Mass Energy ◽  
Momentum Distributions ◽  
Rapidity Distributions

The rapidity distributions of [Formula: see text] mesons produced in proton-lead ([Formula: see text]-Pb) collisions at center-of-mass energy per nucleon pair [Formula: see text][Formula: see text]TeV are studied by using a multisource thermal model and compared with the experimental data of the LHCb and ALICE Collaborations. Correspondingly, the pseudorapidity distributions are accurately obtained from the parameters extracted from the rapidity distributions. At the same time, the transverse momentum distributions in the same experiments are described by the simplest Erlang distribution which is the folding result of two exponential distributions which are contributed by the target and projectile partons, respectively.

Analysis of transverse momentum distributions of charged particles produced in CC interactions at 4.2 A GeV/c

2019 ◽  
Vol 34 (23) ◽  
pp. 1950187
Author(s):  
A. R. Gilani ◽  
Z. Wazir ◽  
M. K. Suleymanov ◽  
S. Kanwal ◽  
S. M. Aslam ◽  
...  
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Bubble Chamber ◽  
Nuclear Research ◽  
Cascade Model ◽  
Model Data ◽  
Simulation Data ◽  
The Third ◽  
Momentum Distributions ◽  
Number Of Particles

In this paper, the transverse momentum and maximum transverse momentum distributions of protons and pions produced in an event for CC collisions at 4.2 A GeV/c have been analyzed. This analysis is based on experimental data obtained from 2 m propane bubble chamber at Joint Institute for Nuclear Research, Dubna, Russia and simulation data obtained from Dubna cascade code. We observed three disparate zones for the transverse momentum distribution of the produced particles. The third zone where transverse momentum is greater than 0.375 GeV/c is restricted only for pions with transverse momentum approximately equal to 1 GeV/c, and for protons the restricted value of [Formula: see text] is [Formula: see text][Formula: see text]1.5 GeV/c. So contribution of pions to this region is less and decreases sharply than the contribution of protons. The results of cascade model are not fully compatible with the experimental results in the third [Formula: see text] region, as this region contains less number of particles for model data as compared with experimental data but is compatible in the case of [Formula: see text].

scholarly journals Central and peripheral hadron–nucleus collisions in the Additive Quark Model

2019 ◽  
Vol 34 (06) ◽  
pp. 1950048
Author(s):  
G. H. Arakelyan ◽  
Yu. M. Shabelski ◽  
A. G. Shuvaev
Keyword(s):  
Experimental Data ◽  
Quark Model ◽  
Constituent Quark ◽  
High Energies ◽  
Central Collisions ◽  
Energy Formula ◽  
Incident Nucleon ◽  
Good Agreement

Peripheral nucleon–nucleus collisions occur at high energies mainly through the interaction with one constituent quark from the incident nucleon. The central collisions should involve all three constituent quarks and each of them can interact several times. We calculate the average number of quark–nucleus interactions for both the cases in good agreement with the experimental data on [Formula: see text]-meson, [Formula: see text] and all charged secondaries productions in [Formula: see text] collisions at LHC energy [Formula: see text] TeV.

scholarly journals Event Patterns Extracted from Transverse Momentum and Rapidity Spectra ofZBosons and Quarkonium States Produced in pp and Pb-Pb Collisions at LHC

2016 ◽  
Vol 2016 ◽  
pp. 1-19 ◽  
Author(s):  
Ya-Hui Chen ◽  
Fu-Hu Liu ◽  
Roy A. Lacey
Keyword(s):  
Transverse Momentum ◽  
Hadron Collider ◽  
Center Of Mass ◽  
Three Dimensional ◽  
Erlang Distribution ◽  
Proton Proton ◽  
Center Of Mass Energy ◽  
Two Component ◽  
Scatter Plots ◽  
Parameter Values

Transverse momentum (pT) and rapidity (y) spectra ofZbosons and quarkonium states (some charmoniumcc¯mesons such asJ/ψandψ(2S)and some bottomoniumbb¯mesons such asΥ(1S),Υ(2S), andΥ(3S)) produced in proton-proton (pp) and lead-lead (Pb-Pb) collisions at the large hadron collider (LHC) are uniformly described by a hybrid model of two-component Erlang distribution forpTspectrum and two-component Gaussian distribution foryspectrum. The former distribution results from a multisource thermal model, and the latter one results from the revised Landau hydrodynamic model. The modelling results are in agreement with the experimental data measured in pp collisions at center-of-mass energiess=2.76and 7 TeV and in Pb-Pb collisions at center-of-mass energy per nucleon pairsNN=2.76 TeV. Based on the parameter values extracted frompTandyspectra, the event patterns (particle scatter plots) in two-dimensionalpT-yspace and in three-dimensional velocity space are obtained.

scholarly journals Investigating the Prompt Photon Production at the LHC Energies

2017 ◽  
Vol 45 ◽  
pp. 1760061
Author(s):  
Glauber S. dos Santos ◽  
Magno V. T. Machado
Keyword(s):  
Transverse Momentum ◽  
Cross Section ◽  
Photon Production ◽  
Prompt Photon ◽  
Dipole Cross Section ◽  
High Energies ◽  
Color Dipole ◽  
Momentum Distributions

We investigate the rapidity and transverse momentum distributions of the prompt photon production at the LHC energies considering the color dipole approach. We compare the predictions from distinct models for the dipole cross section, where parton saturation models at high energies are expected to be important at the forward rapidities in [Formula: see text] and [Formula: see text] collisions at the LHC.

Transverse momentum distributions of identified particles produced in pp, p(d), and AA collisions at high energies

Pramana ◽  
2012 ◽  
Vol 79 (6) ◽  
pp. 1407-1423 ◽  
Author(s):  
YA-QIN GAO ◽  
CAI-XING TIAN ◽  
MAI-YING DUAN ◽  
BAO-CHUN LI ◽  
FU-HU LIU
Keyword(s):  
Transverse Momentum ◽  
High Energies ◽  
Momentum Distributions ◽  
Aa Collisions

scholarly journals A Description of Transverse Momentum Distributions in p+p Collisions at RHIC and LHC Energies

2019 ◽  
Vol 2019 ◽  
pp. 1-9
Author(s):  
Jia-Qi Hui ◽  
Zhi-Jin Jiang
Keyword(s):  
Experimental Data ◽  
Transverse Momentum ◽  
Long Range ◽  
Collective Motion ◽  
Good Description ◽  
Dense Matter ◽  
Relativistic Hydrodynamics ◽  
Nonextensive Statistics ◽  
Long Range Interactions ◽  
Momentum Distributions

It has long been debated whether the hydrodynamics is suitable for the smaller colliding systems such as p+p collisions. In this paper, by assuming the existence of longitudinal collective motion and long-range interactions in the hot and dense matter created in p+p collisions, the relativistic hydrodynamics incorporating with the nonextensive statistics is used to analyze the transverse momentum distributions of the particles. The investigations of the present paper show that the hybrid model can give a good description of the currently available experimental data obtained in p+p collisions at RHIC and LHC energies, except for p and p¯ produced in the range of pT>3.0 GeV/c at s=200 GeV.

The Transition Between Mild and Severe Wear for Boundary-Lubricated Steels

1991 ◽  
Vol 113 (1) ◽  
pp. 65-72 ◽  
Author(s):  
B. Samuels ◽  
M. N. Richards
Keyword(s):  
Experimental Data ◽  
Boundary Lubrication ◽  
Applied Load ◽  
Plastic Collapse ◽  
Wear Model ◽  
Aisi 4340 Steel ◽  
Severe Wear ◽  
Surface Plasticity ◽  
Two Component ◽  
Good Agreement

The wear of AISI-4340 steel under boundary lubrication has been measured in reciprocating sliding. As the hardness of martensitic specimens is reduced from 700 Hv to 250 Hv the wear passes through a transition from “mild” to “severe” wear. A two-component wear model, associating the wear mechanisms with sub-surface and surface plasticity controlled modes of asperity deformation, has been quantitatively fitted to the experimental data. Good agreement is found between the values of constants in the model obtained in this way, and other theoretical and experimental data in the literature. The model can also account for the results of increasing the applied load, by allowing for the effects of increased friction and plastic collapse and removal of the most severely deformed asperities.

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