Azimuthal correlations of pions in relativistic heavy-ion collisions at 1 GeV/nucleon

Bass, Steffen A.; Hartnack, C.; Stöcker, H.; Greiner, Walter

doi:10.1103/physrevc.51.3343

Cited by 140 publications

(162 citation statements)

References 78 publications

Supporting

Mentioning

150

Contrasting

Order By: Relevance

“…The anti-correlation of nucleons and pions was explained in Ref. [50] as due to an effect of multiple πN scattering. However, in Ref.…”

Section: Directed Flow Of π − -Mesonsmentioning

confidence: 99%

Collective flows of protons andπ−mesons in2H+C,Ta and He
Chkhaidze
¹
,
Djobava
²
,
Galoyan
³

et al. 2011
Phys. Rev. C
8
0
3
1
View full text Add to dashboard Cite

Abstract. Collective flows of protons and negative pions have been studied in 2 H+C, Ta and He+C, Ta collisions at energy of 3.4 GeV/nucleon. The data has been obtained by 2m Propane Bubble Chamber (PBC-500) at JINR. It is found that the directed flow of protons and π − -mesons characterized by d< P x >/d(y) increases with increase of the mass numbers of colliding nucleus pairs; the elliptic proton flow points out of the reaction plane and also strengthens as system mass increases; the negative pion directed flow is in the reaction plane as proton one for the lighter ( 2 H+C, He+C) systems and in the opposite direction for the heavier ( 2 H+Ta, He+Ta) systems. In 2 H+C, He+C, C+C, C+Ne, 2 H+Ta, He+Ta, C+Cu and C+Ta collisions, the linear dependence of directed and elliptic flow parameters from mass numbers of projectile and target nuclei ─ (A P . A T ) 1/2 , is similar for protons while for π − -mesons the dependence of directed flow parameters is stronger. The Ultra-relativistic Quantum Molecular Dynamical Model (UrQMD) enlarged by the Statistical Multi-fragmentation Model (SMM) satisfactorily describes the obtained experimental results for all pairs of nuclei. The data for such asymmetric nuclear collisions are obtained for the first time.

show abstract

“…The anti-correlation of nucleons and pions was explained in Ref. [50] as due to an effect of multiple πN scattering. However, in Ref.…”

Section: Directed Flow Of π − -Mesonsmentioning

confidence: 99%

Collective flows of protons andπ−mesons in2H+C,Ta and He
Chkhaidze
¹
,
Djobava
²
,
Galoyan
³

et al. 2011
Phys. Rev. C
8
0
3
1
View full text Add to dashboard Cite

show abstract

“…However, pions from the more dilute large-|z| region have less opportunity for rescattering and so retain the positive p x −p z correlation of their (flowing) parent ∆'s. Similar considerations generate a sign change in the pion flow as the impact parameter is varied in transport models [18].…”

mentioning

confidence: 99%

“…This bears directly on the physical causes of directed pion flow at these energies. Detailed transport model studies [18] have shown that pion reflection from (not absorption by) the nucleonic matter is at the root of directed pion flow at these energies. Focussing on the forward hemisphere, if absorption processes (πN N → ∆N → N N ) were dominant in producing pion flow, we would expect an absence of π emission points in the +x quadrant, i.e.…”

mentioning

confidence: 99%

Tilted pion sources from azimuthally sensitive HBT interferometry

2000

View full text Add to dashboard Cite

Intensity interferometry in noncentral heavy ion collisions provides access to novel information on the geometry of the effective pion-emitting source. We demonstrate analytically that, even for vanishing pair momentum, the cross terms R 2 ol and R 2 sl of the HBT correlation function in general show a strong first harmonic in their azimuthal dependence. The strength of this oscillation characterizes the tilt of the major axis of the spatial emission ellipsoid away from the direction of the beam. Event generator studies indicate that this tilt can be large (> 20 • ) at AGS energies which makes it by far the most significant azimuthally sensitive HBT signal at these energies. Moreover, transport models suggest that for pions this spatial tilt is directed opposite to the tilt of the directed flow ellipsoid in momentum space. A measurement of the azimuthal dependence of the HBT cross terms R 2 ol and R 2 sl thus probes directly the physical origin of directed pion flow.

show abstract

“…5, the spectrum of invariant cross-sections of ∆ 0 (1232)-resonances, produced in p+ 12 C collisions, is fitted well by the function in Eq. (16) (17) and (18) with two and three slopes respectively are shown for rapidity intervals −0 4 < < 1 1 and −0 4 < < 2 2. The corresponding parameters of approximation of ( ) by functions in expressions (17) and (18) are presented in Tab.…”

mentioning

confidence: 99%

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Olimov¹,

Haseeb

Olimov

et al. 2011

Open Physics

View full text Add to dashboard Cite

Abstract:The production of ∆ 0 (1232)-resonances in p+ 12 C collisions at 4.2 GeV/c was analyzed with 4π acceptance. The mass distribution of ∆ 0 (1232) was reconstructed using an angular criterion. The fraction of charged π − -mesons coming from ∆ 0 (1232) decay was estimated and compared to those obtained in earlier works. The momentum, transverse momentum, kinetic energy, and rapidity distributions as well as invariant cross sections of ∆ 0 (1232)-resonances were reconstructed in the laboratory frame. The mean kinematical characteristics of the reconstructed ∆ 0 (1232) were compared to those of participant protons in experiment and within some of the models. The freeze-out temperature of ∆ 0 (1232) estimated in the present analysis was compared with those obtained using different methods for ∆(1232) produced with other sets of colliding nuclei at various incident energies. The relative number of nucleons excited to ∆ 0 (1232) at freeze-out conditions in p+ 12 C collisions was estimated.

show abstract

Azimuthal correlations of pions in relativistic heavy-ion collisions at 1 GeV/nucleon

Cited by 140 publications

References 78 publications

Collective flows of protons andπ−mesons in2H+C,Ta and He
Chkhaidze
¹
,
Djobava
²
,
Galoyan
³

et al. 2011
Phys. Rev. C
8
0
3
1
View full text Add to dashboard Cite

Collective flows of protons andπ−mesons in2H+C,Ta and He
Chkhaidze
¹
,
Djobava
²
,
Galoyan
³

et al. 2011
Phys. Rev. C
8
0
3
1
View full text Add to dashboard Cite

Tilted pion sources from azimuthally sensitive HBT interferometry

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Contact Info

Product

Resources

About

Azimuthal correlations of pions in relativistic heavy-ion collisions at 1 GeV/nucleon

Cited by 140 publications

References 78 publications

Collective flows of protons andπ−mesons in2H+C,Ta and HeChkhaidze1, Djobava2, Galoyan3 et al. 2011Phys. Rev. C8031View full textAdd to dashboardCite

Collective flows of protons andπ−mesons in2H+C,Ta and HeChkhaidze1, Djobava2, Galoyan3 et al. 2011Phys. Rev. C8031View full textAdd to dashboardCite

Tilted pion sources from azimuthally sensitive HBT interferometry

Analysis of Δ0(1232) production in collisions of protons with carbon nuclei at 4.2 GeV/c

Contact Info

Product

Resources

About

Collective flows of protons andπ−mesons in2H+C,Ta and He
Chkhaidze
¹
,
Djobava
²
,
Galoyan
³

et al. 2011
Phys. Rev. C
8
0
3
1
View full text Add to dashboard Cite

Collective flows of protons andπ−mesons in2H+C,Ta and He
Chkhaidze
¹
,
Djobava
²
,
Galoyan
³

et al. 2011
Phys. Rev. C
8
0
3
1
View full text Add to dashboard Cite