scholarly journals Spectator induced electromagnetic effects on charged meson production in nucleus-nucleus collisions from NA61/SHINE at CERN SPS

2022 ◽  
Author(s):  
Sneha Bhosale
Keyword(s):  
Meson Production ◽  
Electromagnetic Effects ◽  
Charged Meson

scholarly journals Electromagnetic effects on meson production: a new tool for studying the space-time evolution of heavy ion collisions

2016 ◽  
Vol 130 ◽  
pp. 05016 ◽  
Author(s):  
Andrzej Rybicki ◽  
Antoni Szczurek ◽  
Mariola Kłusek-Gawenda ◽  
Nikolaos Davis ◽  
Vitalii Ozvenchuk ◽  
...  
Keyword(s):  
Time Evolution ◽  
Heavy Ion Collisions ◽  
Meson Production ◽  
Heavy Ion ◽  
Space Time ◽  
Ion Collisions ◽  
Electromagnetic Effects ◽  
Space Time Evolution

The interaction of 970 MeV protons with helium

1960 ◽  
Vol 257 (1290) ◽  
pp. 316-325 ◽  
Keyword(s):  
Cross Sections ◽  
Optical Model ◽  
Meson Production ◽  
Absorption Cross ◽  
Proton Proton ◽  
Particle Characteristics ◽  
Pressure Diffusion ◽  
Elastic Proton ◽  
Charged Meson ◽  
Mev Protons

The interaction of 970 MeV protons with helium has been studied with a high-pressure diffusion cloud chamber. From 642 events the total and absorption cross-sections were found to be 116 ± 17 mb and 93 ± 13 mb, respectively. These agree with values obtained by extrapolation of known cross-sections for more complex nuclei, and the results are interpreted in terms of the optical model of the nucleus. The angular distribution for elastic-scattering yields an α -particle radius of 1⋅8 x 10 -13 cm. Quasi-elastic proton-proton and proton-neutron scattering, and more particularly charged meson production, show that the α -particle has some individual particle characteristics. Meson reabsorption appears unimportant.

Analysis of Charged Meson Production by Protons

1951 ◽  
Vol 83 (1) ◽  
pp. 167-168 ◽  
Author(s):  
S. Passman ◽  
M. M. Block ◽  
W. W. Havens
Keyword(s):  
Meson Production ◽  
Charged Meson

scholarly journals Mesons in NA61/SHINE

2019 ◽  
Vol 199 ◽  
pp. 02020
Author(s):  
Antoni Marcinek
Keyword(s):  
Time Evolution ◽  
Size Dependence ◽  
Meson Production ◽  
Dense Matter ◽  
System Size ◽  
Space Time ◽  
Preliminary Results ◽  
Electromagnetic Effects ◽  
Space Time Evolution ◽  
Selection Of

This contribution presents a selection of recent results on meson production from the NA61/SHINE experiment. The results include spectra of ø mesons in p + p collisions at 40, 80 and 158 GeV/c beam momenta, as well as π±, K±, ρ0, ω and K*0 mesons in π− + C collisions at 158 GeV/c and 350 GeV/c. They are compared with predictions of several models. A spectacular failure of considered models is observed for ø, ρ0 and K*0 production. Also a very peculiar system size dependence of the longitudinal evolution of ø production, contrasting with all other measured hadrons, is shown. Finally, preliminary results on spectator-induced electromagnetic effects in π± production in Ar + Sc at 150A GeV/c are presented, bringing information on space-time evolution of the hot and dense matter created in the collision.

scholarly journals New results on energy and momentum conservation in meson production for A+A collisions at SPS energies

2019 ◽  
Vol 199 ◽  
pp. 05002
Author(s):  
A. Rybicki ◽  
A. Szczurek ◽  
M. Kiełbowicz ◽  
K. Mazurek ◽  
V. Ozvenchuk
Keyword(s):  
Meson Production ◽  
Momentum Conservation ◽  
Space Time ◽  
Final State ◽  
Rapidity Distributions ◽  
Charged Meson ◽  
The Spectator ◽  
Energy And Momentum ◽  
Insight Into

We review our recent findings on electromagnetic (EM) effects in Ar+Sc and Pb+Pb collisions at CERN SPS energies, and discuss them in the context of our earlier results on the EM splitting of π+/π- meson directed flow. A specific space-time picture emerges, on the basis of which we construct a simple model of the collision. Starting from local energy and momentum conservation, we nicely describe the centrality dependence of π meson rapidity distributions in Pb+Pb collisions at $\rad{}{s_{NN} } = 17.3\,{\rm{GeV}}$. We discuss the resulting implications on the role of energy and momentum conservation for the dynamics of meson production in A+A collisions. We present our conclusions on the link between the initial stages of the nuclear collision and the final state observables connected to strong and electromagnetic phenomena in charged meson emission. We also discuss the possibility to use the latter EM phenomena to obtain new insight into the spectator space-time evolution and excitation energy.

scholarly journals New baryonic and mesonic observables from NA61/SHINE

2018 ◽  
Vol 182 ◽  
pp. 02082 ◽  
Author(s):  
Antoni Marcinek
Keyword(s):  
Power Law ◽  
Meson Production ◽  
System Size ◽  
Density Fluctuations ◽  
Proton Density ◽  
Factorial Moments ◽  
Strongly Interacting ◽  
Charged Meson ◽  
The Spectator ◽  
Scaled Factorial Moments

One of the main objectives of the NA61/SHINE experiment at the CERN SPS is to study properties of strongly interacting matter. This paper presents new results on observables relevant for this part of the NA61/SHINE programme. These include the first ever measurements of ϕ meson production in p+p collisions at 40 and 80 GeV, and most detailed ever experimental data at 158 GeV. This contribution demonstrates the superior accuracy of the present dataset with respect to existing measurements. The comparison of p+p to Pb+Pb collisions shows a non-trivial system size dependence of the longitudinal evolution of hidden strangeness production, contrasting with that of other mesons. Furthermore, proton density fluctuations are investigated as a possible order parameter of the second order phase transition in the neighbourhood of the critical point (CP) of strongly interacting matter. An intermittency analysis is performed of the proton second scaled factorial moments in transverse momentum space. A previous analysis of this sort revealed significant power-law fluctuations for the “Si”+Si system at 158A GeV measured by the NA49 experiment. The fitted power-law exponent was consistent within errors with the theoretically expected critical value, a result suggesting a baryochemical potential in the vicinity of the CP of about 250MeV [24]. The analysis will now be extended to NA61/SHINE systems of similar size, Be+Be and Ar+Sc, at 150A GeV. Finally, spectator-induced electromagnetic (EM) effects on charged meson production are being studied and bring information on the space-time position of the pion formation zone, which appears to be much closer to the spectator system for faster pions than for slower ones. On that basis, we demonstrate that the longitudinal evolution of the system at CERN SPS energies may be interpreted as a pure consequence of local energymomentum conservation.

NON-LOCAL ELECTROMAGNETIC EFFECTS AT METAL SURFACES

1983 ◽  
Vol 44 (C10) ◽  
pp. C10-305-C10-314
Author(s):  
S. Lundqvist ◽  
P. Apell
Keyword(s):  
Metal Surfaces ◽  
Electromagnetic Effects ◽  
Non Local
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