Scaling properties of fluctuation and correlation results from PHENIX

Mitchell, J. T.

doi:10.1088/0954-3899/34/8/s124

Cited by 13 publications

(16 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…6 . Also the PHENIX results confirm that the magnitude of the p T (%) fluctuation measure exhibits only a small variation in a very wide energy range between √ s NN = 22 and 200 GeV [37]. It appears that the increase of p T ( σ p T :n ) with the accepted particle multiplicity is approximately linear (Fig.…”

Section: -15supporting

confidence: 56%

Energy dependence of transverse momentum fluctuations inPb+Pbcollisions at the CERN Super Proton Synchrotron (SPS) at20Ato
Antičić
¹
,
Kadija
²
,
Nicolic
³

et al. 2009
Phys. Rev. C

View full text Add to dashboard Cite

Results are presented on event-by-event fluctuations of transverse momenta p T in central Pb + Pb interactions at 20A, 30A, 40A, 80A, and 158A GeV. The analysis was performed for charged particles at forward center-ofmass rapidity (1.1 < y * π < 2.6). Three fluctuation measures were studied: the distribution of average transverse momentum M(p T ) in the event, the p T fluctuation measure, and two-particle transverse momentum correlations. Fluctuations of p T are small and show no significant energy dependence in the energy range of the CERN Super Proton Synchrotron. Results are compared with QCD-inspired predictions for the critical point, and with the UrQMD model. Transverse momentum fluctuations, similar to multiplicity fluctuations, do not show the increase expected for freeze-out near the critical point of QCD.

show abstract

Section: -15supporting

confidence: 56%

Energy dependence of transverse momentum fluctuations inPb+Pbcollisions at the CERN Super Proton Synchrotron (SPS) at20Ato
Antičić
¹
,
Kadija
²
,
Nicolic
³

et al. 2009
Phys. Rev. C

View full text Add to dashboard Cite

show abstract

“…Another interesting issue seen so far only in a preliminary result from PHENIX (Fig. 2.16) [54] is that the same shape awayside correlation persists in Au+Au central collisions even for auto-correlations of particles with very low p T between 0.2 and 0.4 GeV/c where any effect of hard-scattered partons should be submerged by the predominant soft physics. Clearly, measurements of correlations with both particles identified and covering a broad range of p T t and p T a as a function of the reaction plane are sorely needed.…”

Section: Correlations Jets and Fragmentationmentioning

confidence: 90%

Successes and failures with hard probes

Tannenbaum

2009

Eur. Phys. J. C

View full text Add to dashboard Cite

The two major pillars of searches for the Quark Gluon Plasma have been: J /Ψ suppression, proposed in 1986, and observed at both SPS fixed target energies and at RHIC; and, more recently, the suppression of π 0 with p T ≥ 3 GeV/c by a factor ∼5 in Au+Au central collisions, observed at RHIC in 2001, which had been predicted in advance as a consequence of Landau-PomeranchuckMigdal coherent (gluon) bremsstrahlung by the outgoing hard-scattered partons traversing the medium. However, new effects were discovered and the quality of the measurements greatly improved so that the clarity of the original explanations has become obscured. For instance: J /Ψ suppression is the same at SpS and RHIC. Is it the QGP, comovers, something else? QCD provides beautiful explanations of π 0 and direct γ measurements in p-p collisions but precision fits of the best theories of π 0 suppression barely agree with the Au+Au data. Better data are needed for 10 < p T < 20 GeV/c, systematic errors are needed in theory calculations, the values of parameters of the medium such as q derived from precision fits are the subject of controversy. Baryons are much less suppressed than mesons, leading to an anomalousp/π ratio for 2 ≤ p T ≤ 4.5 GeV/c, but beautiful theoretical explanations of the effect such as recombination do not work in detail. Heavy quarks seem to be suppressed the same as the light quarks, naively arguing against the bremsstrahlung explanation and suggesting exotic, possible transformational explanations. Di-hadron correlations reveal a trigger side ridge, possible Mach cones on the away side, vanishing and reappearance of away jets, both wide and normal jet correlations with and without apparent loss of energy. Can this all be explained consistently? Preliminary results of direct γ production in Au+Au appear to indicate a suppression approaching that of π 0 for p T ≈

show abstract

“…As in previous publications [37,43], charged particle tracks are reconstructed by DC based on a combinatorial Hough transform, which gives the angle of the track in the main bend plane. PC1 is used to measure the position of the hit in the longitudinal direction along the beam axis.…”

Section: A Event Selectionmentioning

confidence: 99%

“…Single particle tracks are passed from geant to the PHENIX event reconstruction software [43]. In this simulation, the BBC, DC, and TOF detector responses are tuned to match the real data.…”

Section: Efficiency Correctionsmentioning

confidence: 99%

Identified charged hadron production inp+pcollisions ats=200and 62.4 GeV

Adare¹,

Afanasiev²,

Aidala³

et al. 2011

Phys. Rev. C

191

100

View full text Add to dashboard Cite

Transverse momentum distributions and yields for π ± , K ± , p and p in p + p collisions at √ s = 200 and 62.4 GeV at midrapidity are measured by the PHENIX experiment at the Relativistic Heavy Ion Collider (RHIC). These data provide important baseline spectra for comparisons with identified particle spectra in heavy ion collisions at RHIC. We present the inverse slope parameter Tinv, mean transverse momentum pT and yield per unit rapidity dN/dy at each energy, and compare them to other measurements at different √ s in p + p and p + p collisions. We also present the scaling properties such as mT scaling, xT scaling on the pT spectra between different energies. To discuss the mechanism of the particle production in p + p collisions, the measured spectra are compared to nextto-leading-order or next-to-leading-logarithmic perturbative quantum chromodynamics calculations.

show abstract

Scaling properties of fluctuation and correlation results from PHENIX

Cited by 13 publications

References 10 publications

Energy dependence of transverse momentum fluctuations inPb+Pbcollisions at the CERN Super Proton Synchrotron (SPS) at20Ato
Antičić
¹
,
Kadija
²
,
Nicolic
³

et al. 2009
Phys. Rev. C

Energy dependence of transverse momentum fluctuations inPb+Pbcollisions at the CERN Super Proton Synchrotron (SPS) at20Ato
Antičić
¹
,
Kadija
²
,
Nicolic
³

et al. 2009
Phys. Rev. C

Successes and failures with hard probes

Identified charged hadron production inp+pcollisions ats=200and 62.4 GeV

Contact Info

Product

Resources

About

Scaling properties of fluctuation and correlation results from PHENIX

Cited by 13 publications

References 10 publications

Energy dependence of transverse momentum fluctuations inPb+Pbcollisions at the CERN Super Proton Synchrotron (SPS) at20AtoAntičić1, Kadija2, Nicolic3 et al. 2009Phys. Rev. C

Energy dependence of transverse momentum fluctuations inPb+Pbcollisions at the CERN Super Proton Synchrotron (SPS) at20AtoAntičić1, Kadija2, Nicolic3 et al. 2009Phys. Rev. C

Successes and failures with hard probes

Identified charged hadron production inp+pcollisions ats=200and 62.4 GeV

Contact Info

Product

Resources

About

Energy dependence of transverse momentum fluctuations inPb+Pbcollisions at the CERN Super Proton Synchrotron (SPS) at20Ato
Antičić
¹
,
Kadija
²
,
Nicolic
³

et al. 2009
Phys. Rev. C

Energy dependence of transverse momentum fluctuations inPb+Pbcollisions at the CERN Super Proton Synchrotron (SPS) at20Ato
Antičić
¹
,
Kadija
²
,
Nicolic
³

et al. 2009
Phys. Rev. C