scholarly journals The energy dependence of antiparticle to particle ratios in high energy pp collisions

2014 ◽  
Vol 23 (12) ◽  
pp. 1450088
Author(s):  
Wang Jiang-Ling ◽  
Li Di-Kai ◽  
Li Hai-Jun ◽  
Chen Gang
Keyword(s):  
Phase Space ◽  
Transverse Momentum ◽  
Energy Dependence ◽  
Preliminary Data ◽  
High Energy ◽  
Pp Collisions ◽  
Average Transverse Momentum ◽  
Significant Dependence ◽  
Particle Ratios ◽  
200 Gev

The energy dependence of the ratio for antiparticle to particle in pp collisions of high energy is studied using the parton and hadron cascade and dynamically constrained phase-space coalescence models. The yield ratios of antimatter and matter for different masses are measured at various c.m energies. It is found that the yield ratios of antimatter and matter increase with the increase of the c.m energy of pp collisions until they gradually approach to 1 after the c.m energy is more than 200 GeV. The distribution of transverse momentum also has significant dependence on the energy and mass, i.e., the average transverse momentum increases when the c.m energy of pp collisions increase. The model results are compatible with the STAR and ALICE preliminary data.

scholarly journals ENERGY DEPENDENCE OF AVERAGE TRANSVERSE MOMENTUM IN HADRON PRODUCTION DUE TO COLLECTIVE EFFECTS

2010 ◽  
Vol 25 (16) ◽  
pp. 1315-1324 ◽  
Author(s):  
S. M. TROSHIN ◽  
N. E. TYURIN
Keyword(s):  
Transverse Momentum ◽  
Energy Dependence ◽  
Transient State ◽  
Hadron Production ◽  
Collective Effects ◽  
Pp Collisions ◽  
Average Transverse Momentum ◽  
Secondary Particles ◽  
Collective Rotation ◽  
State Of Matter

Motivated by the first measurements of the experiment CMS at the LHC at [Formula: see text] and 2.36 TeV, we discuss energy dependence of average transverse momentum of the secondary particles in hadron production in pp-collisions. We suggest a possible explanation of this dependence as a result of collective rotation of the transient state and associate its further possible decrease with flattening off at higher energies with transition to the genuine QGP state of matter.

Measurement of the average transverse momentum and of the pion-emission volume in proton-nucleus and antiproton-nucleus reactions at 200 GeV

1984 ◽  
Vol 29 (3) ◽  
pp. 363-367 ◽  
Author(s):  
C. De Marzo ◽  
M. De Palma ◽  
A. Distante ◽  
C. Favuzzi ◽  
P. Lavopa ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Average Transverse Momentum ◽  
Pion Emission ◽  
200 Gev ◽  
Emission Volume

Production of light flavored charged hadron in pp collisions at 900 GeV with hadron production models

2019 ◽  
Vol 34 (13) ◽  
pp. 1950100 ◽  
Author(s):  
M. Ajaz ◽  
M. Tufail ◽  
Y. Ali
Keyword(s):  
Transverse Momentum ◽  
Entire Range ◽  
Star Collaboration ◽  
Hadron Production ◽  
Charged Hadron ◽  
Experimental Measurements ◽  
Average Transverse Momentum ◽  
Production Models ◽  
200 Gev ◽  
Small Rise

Differential yields of light flavored charged hadrons in [Formula: see text] collision at 0.9 TeV in the transverse momentum [Formula: see text] ranging from 0.1–2.5 GeV/c with pseudorapidity [Formula: see text] are presented here. The spectra obtained by Monte Carlo simulations with event generators — EPOS 1.99, EPOS-LHC, QGSJETII-04 and Sibyll2.3c — are compared with the ALICE measurements. For [Formula: see text] mesons, EPOS1.99, EPOS-LHC and QGSJETII-04 described the ALICE measurement very well almost in the entire [Formula: see text] range except QGSJETII-04 which underpredicts with [Formula: see text] below 0.4 GeV/c. The Sibyll2.3c model slightly overpredicts for [Formula: see text] GeV/c and underpredicts afterwards. For [Formula: see text] mesons, all models describe the experimental data qualitatively, except at high [Formula: see text], where the models slightly underpredict. The EPOS-LHC and QGSJETII-04 models, at low [Formula: see text], describe the distribution of the experimental measurements very well in both cases of protons and anti-protons, whereas the former underpredicts and the latter overpredicts at higher [Formula: see text]. The EPOS1.99 overpredicts at low [Formula: see text] below 1 GeV/c, whereas it reproduces the results well above it. Sibyll2.3c overpredicts the distribution over the entire range of [Formula: see text]. Models described the average transverse momentum [Formula: see text] of these hadron species as a function of their mass, showing small rise in the average [Formula: see text] with the mass of the particles. The same has been observed by the STAR collaboration with measurements in [Formula: see text] reactions at [Formula: see text] = 200 GeV and also in [Formula: see text] collisions at [Formula: see text] = 900 GeV.

scholarly journals Multiplicity dependence of the average transverse momentum in π+ p, K+ p and pp collisions at 250 GeV/c

1988 ◽  
Vol 209 (1) ◽  
pp. 103-106 ◽  
Author(s):  
V.V. Aivazyan ◽  
I.V. Ajinenko ◽  
Yu.A. Belokopytov ◽  
H. Białkowska ◽  
H. Böttcher ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Pp Collisions ◽  
Average Transverse Momentum

scholarly journals Energy dependence of π±, p and p¯ transverse momentum spectra for Au+Au collisions at sNN=62.4 and 200 GeV

2007 ◽  
Vol 655 (3-4) ◽  
pp. 104-113 ◽  
Author(s):  
B.I. Abelev ◽  
M.M. Aggarwal ◽  
Z. Ahammed ◽  
B.D. Anderson ◽  
D. Arkhipkin ◽  
...  
Keyword(s):  
Transverse Momentum ◽  
Energy Dependence ◽  
Momentum Spectra ◽  
200 Gev ◽  
Transverse Momentum Spectra

scholarly journals Detection of particles of dark matter from the spectrum of secondary particles in high-energy proton-proton collisions in a thermodynamic model

2021 ◽  
Vol 2131 (2) ◽  
pp. 022054
Author(s):  
A T D’yachenko ◽  
E S Gromova
Keyword(s):  
Experimental Data ◽  
Dark Matter ◽  
Transverse Momentum ◽  
Quantum Electrodynamics ◽  
Hadron Collider ◽  
High Energy ◽  
Boson Mass ◽  
Proton Collision ◽  
Pp Collisions ◽  
Wide Range

Abstract In a simple hydrodynamic model, the transverse momentum distributions are found for A hyperons formed in pp collisions at ultrarelativistic energies. The calculated spectra are compared with the experimental data obtained for various colliders in a wide range of proton collision energies, including the data from experiments at the Large Hadron Collider. An interpretation of the transverse momentum spectra of soft photons in pp collisions is proposed, taking into account the X17 boson with a mass of 17 MeV - a new particle, a possible candidate for the role of dark matter particles. A tube model is proposed on the basis of combining two-dimensional quantum chromodynamics and quantum electrodynamics. An interpretation is proposed for the detection of a 38 MeV boson in the spectra of photons emitted in the reactions of protons with carbon nuclei at an incident proton momentum of 5.5 GeV/c. The X38 boson with a mass of 38 MeV has a mass close to the boson mass obtained by us, equal to 35 MeV for an electromagnetic tube. This new particle was discovered in experiments carried out recently in Dubna for the reactionp p + C→2γ + X. To interpret the obtained experimental data on the spectra of emitted photons depending on their mass, it is proposed to use the formulas obtained for massive particles, setting the mass of a boson decaying into two photons equal to 38 MeV. It was proposed to consider bosons X17 and X38 as particles of dark matter.

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