Two-particle azimuthal correlations at forward rapidity in STAR

Ermes Braidot

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Two-particle azimuthal correlations at forward rapidity in STAR

Ermes Braidot

Nuclear Experiment · Submitted 4 Feb 2011

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim The analysis in this thesis shows that such correlations and their dependence on rapidity, transverse momentum and collision centrality are qualitative consistent with the existence of gluon saturation effects in the relativistic nucleus.

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What the abstract itself states, as probabilities: claims first 0.04 · states limitation 0.17 · human participants 0.02 · controlled comparison 0.21 · randomized assignment 0.01 · states quantitative result 0.11 · compares with prior results 0.18 · mentions code or data availability 0.02.

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arXiv listing abstract v1. Results and the main claim are underlined; show every role.

During the 2008 run the Relativistic Heavy Ion Collider (RHIC) at the Brookhaven Nation Laboratiory (BNL), NY, provided high luminosity in both p+p and d+Au collisions at $\sqrt{s_{NN}}=200\mathrm{\,GeV}$. Electromagnetic calorimeter acceptance in STAR was enhanced by the new Forward Meson Spectrometer (FMS), and is now almost contiguous from $-1<\eta\4$ over the full azimuth. This allows measurements of the azimuthal correlation between a forward neutral pion and a second particle in a very large rapidity range. Di-hadron azimuthal correlations provide sensitivity to the low longitudinal momentum fraction ($x$) component of the gluon density in the nuclear target. Initial state nonlinear effects are in fact expected to appear in d+Au collisions when the dense part of the nucleus is probed. The analysis in this thesis shows that such correlations and their dependence on rapidity, transverse momentum and collision centrality are qualitative consistent with the existence of gluon saturation effects in the relativistic nucleus. Theoretical expectations for azimuthal correlations between a dilute system (deuteron) and a saturated target (Gold nucleus) have been explored.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	During the 2008 run the Relativistic Heavy Ion Collider (RHIC) at the Brookhaven Nation Laboratiory (BNL), NY, provided high luminosity in both p+p and d+Au collisions at $\sqrt{s_{NN}}=200\mathrm{\,GeV}$.	method 0.55	0.17	0.01	asserted 1.00
s1	Electromagnetic calorimeter acceptance in STAR was enhanced by the new Forward Meson Spectrometer (FMS), and is now almost contiguous from $-1<\eta\4$ over the full azimuth.	method 0.97	0.56	0.02	asserted 1.00
s2	This allows measurements of the azimuthal correlation between a forward neutral pion and a second particle in a very large rapidity range.	method 0.82	0.35	0.03	asserted 0.93
s3	Di-hadron azimuthal correlations provide sensitivity to the low longitudinal momentum fraction ($x$) component of the gluon density in the nuclear target.	background 0.98	0.08	0.03	asserted 0.98
s4	Initial state nonlinear effects are in fact expected to appear in d+Au collisions when the dense part of the nucleus is probed.	background 0.99	0.04	0.03	hedged possibility 0.85
s5	The analysis in this thesis shows that such correlations and their dependence on rapidity, transverse momentum and collision centrality are qualitative consistent with the existence of gluon saturation effects in the relativistic nucleus.	interpretation 0.63	0.91	0.93	hedged possibility 0.95
s6	Theoretical expectations for azimuthal correlations between a dilute system (deuteron) and a saturated target (Gold nucleus) have been explored.	background 0.61	0.20	0.03	asserted 0.79

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from analysis of existing data 0.65.

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arXiv listing abstract v1

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T body sentences
C citations
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The paper

Original abstract

During the 2008 run the Relativistic Heavy Ion Collider (RHIC) at the Brookhaven Nation Laboratiory (BNL), NY, provided high luminosity in both p+p and d+Au collisions at $\sqrt{s_{NN}}=200\mathrm{\,GeV}$. Electromagnetic calorimeter acceptance in STAR was enhanced by the new Forward Meson Spectrometer (FMS), and is now almost contiguous from $-1<\eta\4$ over the full azimuth. This allows measurements of the azimuthal correlation between a forward neutral pion and a second particle in a very large rapidity range. Di-hadron azimuthal correlations provide sensitivity to the low longitudinal momentum fraction ($x$) component of the gluon density in the nuclear target. Initial state nonlinear effects are in fact expected to appear in d+Au collisions when the dense part of the nucleus is probed. The analysis in this thesis shows that such correlations and their dependence on rapidity, transverse momentum and collision centrality are qualitative consistent with the existence of gluon saturation effects in the relativistic nucleus. Theoretical expectations for azimuthal correlations between a dilute system (deuteron) and a saturated target (Gold nucleus) have been explored.

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References

Forward citations

Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

Forward dijets in proton-nucleus collisions at next-to-leading order: the real corrections
hep-ph 2020-09 conditional novelty 6.0 of 10

New simplified trijet cross-sections in the quark channel are integrated over one unmeasured parton to get the real NLO dijet corrections, reproducing B-JIMWLK and DGLAP evolution in the soft and collinear limits.
Multi-gluon correlations and evidence of saturation from dijet measurements at an Electron Ion Collider
nucl-th 2019-12 conditional novelty 6.0 of 10

Full Color Glass Condensate calculations of inclusive and diffractive dijet cross sections beyond the correlation limit show target-dependent deviations that the authors propose as a saturation test at a future Electr...
Forward dihadron correlations in deuteron-gold collisions with a Gaussian approximation of JIMWLK
hep-ph 2012-09 conditional novelty 6.0 of 10

Including both elastic and inelastic terms in the full dihadron cross section roughly doubles the predicted away-side correlation peak and shows that double parton scattering is already contained in the standard formula.
JIMWLK evolution in the Gaussian approximation
hep-ph 2011-12 accept novelty 6.0 of 10

A Gaussian mean-field approximation to the JIMWLK equations, valid at any number of colors, computes all n-point Wilson-line correlators from the dipole S-matrix alone.
Higher-point correlations from the JIMWLK evolution
hep-ph 2011-09 conditional novelty 6.0 of 10

Dropping the 'real' terms of the large-Nc JIMWLK evolution yields explicit expressions for the color quadrupole and sextupole as functionals of the dipole amplitude, claimed valid in both the dilute and saturated regimes.

Show 1 more citing papers

Gluon saturation in dijet production in p-Pb collisions at Large Hadron Collider
hep-ph 2012-05 conditional novelty 5.0 of 10

Using a nonlinear QCD evolution equation fitted to HERA structure-function data, the authors predict that central-forward dijet pairs in p-Pb collisions are suppressed by about a factor of two near back-to-back azimut...

How the literature uses it

25 arXiv papers cite this in 38 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers whose main result relates to this one's

Found among the papers closest to this one by title and main claim. Pith's classifier compared each pair's main results and a second model family confirmed the relation; checked against two further families, shown conflicts agreed 118 times in 120 and shown same results 218 times in 239. The quoted sentence is the other paper's main claim.

States the same result 2 papers

Data exhibit the qualitative features expected from gluon saturation.

Two Particle Correlations at Forward Rapidity in STAR · 0.92
Our analysis provides further evidence for the presence of saturation effects in RHIC data.

Azimuthal correlations of forward di-hadrons in d+Au collisions at RHIC in the Color Glass Condensate · 0.80

Papers citing it · 31 sentences without a confident label

Uses its method or tool 1 paper

Similar to the dihadron correlation measurements at RHIC [ref] , in the definition of the coincidence probability, we follow a convention that a leading or trigger particle has transverse momentum larger than an associated particle.

Semi-inclusive photon-hadron production in pp and pA collisions at RHIC and LHC · observables and numerical setup · 0.84

Compares with it 4 papers

Our absolute prediction (with $μ=p_t1$) for the ratio of the coincidence probabilities is shown in Fig. [ref] together with the data from STAR [ref] .

Gluon saturation in dijet production in p-Pb collisions at Large Hadron Collider · Signatures of saturation in central-forward dijet production in p-Pb collisions · 0.80
This novel feature is unique for prompt-hadron production in contrast to dihadron production [ref] where the trigger particle can only be a hadron and it was already observed at RHIC [ref] that the way-side correlation has only single peak structure.

Semi-inclusive photon-hadron production in pp and pA collisions at RHIC and LHC · Introduction · 0.87
The agreement with the STAR data [ref] is reasonably good taking into account the large experimental uncertainties.

Scattering off the Color Glass Condensate · Numerical results · 0.86

Cites it as background 2 papers

Two particle correlations in high-energy collisions have played significant role to unravel QCD novel phenomena [ref] .

Photon-jet ridge at RHIC and the LHC · Introduction · 0.99
Two particle correlations in high-energy collisions have played significant role to reveal QCD novel phenomena [ref] .

Semi-inclusive photon-hadron production in pp and pA collisions at RHIC and LHC · Introduction · 0.92

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