Cross Sections and Transverse Single-Spin Asymmetries in Forward Neutral-Pion Production from Proton Collisions at \sqrt{s} = 200 GeV

et al; STAR Collaboration: J. Adams

RECORD

Cross Sections and Transverse Single-Spin Asymmetries in Forward Neutral-Pion Production from Proton Collisions at \sqrt{s} = 200 GeV

STAR Collaboration: J. Adams, et al

High Energy Physics - Experiment · Submitted 29 Oct 2003

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

The authors' main claim This is the first significant spin result seen for particles produced with p_T>1 GeV/c at a polarized proton collider.

how it is stated · asserted 1.00 read the record →

Comment (0) Read on arXiv ↗

Cite ▾

arXiv IDhep-ex/0310058 (version 2)

Pith IDU3FAJHKT, Pith's permanent record of this paper and its review

Citationet al, STAR Collaboration: J. Adams. "Cross Sections and Transverse Single-Spin Asymmetries in Forward Neutral-Pion Production from Proton Collisions at \sqrt{s} = 200 GeV." arXiv:hep-ex/0310058 (2003). https://pith.science/paper/U3FAJHKT

Claim paper

The compiled record

The paper's own sentences, arranged. Each label is drawn from a closed vocabulary; the number beside it is the probability the classifier gave that label. Numbers in the tables are the authors', checked by code. No sentence in this record was written by a model.

Open the compiled record

Compiled by classifier-1.13-20260917 via OpenRouter, question bank abstract-p1-20260923, 2026-09-23: 1 request, 4,246 input tokens, $0.0002 reported.

What the abstract itself states, as probabilities: claims first 0.86 · states limitation 0.18 · human participants 0.02 · controlled comparison 0.07 · randomized assignment 0.01 · states quantitative result 0.58 · compares with prior results 0.96 · mentions code or data availability 0.02.

The abstract, sentence by sentence

arXiv listing abstract v2. Results and the main claim are underlined; show every role.

Measurements of the production of forward high-energy pi0 mesons from transversely polarized proton collisions at \sqrt{s}=200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at x_F below about 0.3, and becomes positive and large at higher x_F, similar to the trend in data at \sqrt{s}<=20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with p_T>1 GeV/c at a polarized proton collider.

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	Measurements of the production of forward high-energy pi0 mesons from transversely polarized proton collisions at \sqrt{s}=200 GeV are reported.	contribution 1.00	0.94	0.09	asserted 1.00
s1	The cross section is generally consistent with next-to-leading order perturbative QCD calculations.	result 0.86	0.60	0.11	hedged possibility 0.94
s2	The analyzing power is small at x_F below about 0.3, and becomes positive and large at higher x_F, similar to the trend in data at \sqrt{s}<=20 GeV.	result 1.00	0.87	0.31	asserted 1.00
s3	The analyzing power is in qualitative agreement with perturbative QCD model expectations.	interpretation 0.90	0.60	0.18	asserted 0.54
s4	This is the first significant spin result seen for particles produced with p_T>1 GeV/c at a polarized proton collider.	contribution 0.38	0.82	0.43	asserted 1.00

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from observation or experiment 1.00.

What was examined, and what was not

sources read

arXiv listing abstract v2

not examined

full text
figures and tables
references and citing sentences
relations to other papers

levels run

P abstract

not run

S sections
T body sentences
C citations
R cross-paper relations

Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper

Original abstract

Measurements of the production of forward high-energy pi0 mesons from transversely polarized proton collisions at \sqrt{s}=200 GeV are reported. The cross section is generally consistent with next-to-leading order perturbative QCD calculations. The analyzing power is small at x_F below about 0.3, and becomes positive and large at higher x_F, similar to the trend in data at \sqrt{s}<=20 GeV. The analyzing power is in qualitative agreement with perturbative QCD model expectations. This is the first significant spin result seen for particles produced with p_T>1 GeV/c at a polarized proton collider.

Human review

How Pith checks papers → · Full audit of this paper →

References

Forward citations

Cited by 10 Pith papers

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

Single spin asymmetry in forward $pA$ collisions from Pomeron-Odderon interference
hep-ph 2025-01 conditional novelty 7.0 of 10

A new Pomeron-Odderon interference term in the hybrid CGC framework yields a percent-level transverse single spin asymmetry in forward pA collisions, with a characteristic sign-changing node at the saturation scale.
The transverse-spin asymmetry $A^{\sin\phi_{S_\Lambda}}_{UUT}$ in $\Lambda$ production in SIDIS within the collinear framework
hep-ph 2026-09 accept novelty 6.0 of 10

Model calculation of the twist-3 T-odd fragmentation function \tilde{D}_T for Λ hyperon and prediction of the single-spin asymmetry A^{\sin\phi_{S_\Lambda}}_{UUT} in SIDIS at EIC and EicC.
Origin of single transverse-spin asymmetries in high-energy collisions
hep-ph 2020-02 conditional novelty 6.0 of 10

A simultaneous fit to spin-asymmetry data from SIDIS, Drell-Yan, electron-positron annihilation, and proton-proton collisions supports a common multi-parton origin for single transverse-spin asymmetries and yields ten...
An Observation Concerning the Process Dependence of the Sivers Functions
hep-ph 2011-03 conditional novelty 6.0 of 10

The k-perp moment of the quark Sivers function and the twist-3 quark-gluon correlation function T_{q,F}(x,x) come out with opposite signs for both up and down quarks, a mismatch that survives after correcting a sign c...
k_T factorization is violated in production of high-transverse-momentum particles in hadron-hadron collisions
hep-ph 2007-05 conditional novelty 6.0 of 10

In a simplified abelian model, a one-loop single-spin asymmetry in back-to-back hadroproduction contains a term that no Wilson-line redefinition of the parton density can absorb, so k_T factorization with universal tr...

Show 5 more citing papers

Fragmentation contribution to the transverse single-spin asymmetry in proton-proton collisions
hep-ph 2012-12 conditional novelty 5.0 of 10

The authors derive the collinear twist-3 fragmentation contribution to the transverse single-spin asymmetry in p↑p → hX, including quark-quark and quark-gluon-quark correlators, and present the result as a compact for...
Relations between generalized and transverse momentum dependent parton distributions
hep-ph 2007-03 conditional novelty 5.0 of 10

In scalar-diquark and quark-target models, moments of T-odd TMDs (Sivers, Boer-Mulders) come out proportional to moments of specific GPDs, but no model-independent relation is established.
Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report
physics.ins-det 2021-03 accept novelty 2.0 of 10

The EIC Yellow Report specifies the science goals, required detector capabilities, and technology concepts needed to realize a high-luminosity electron-ion collider program.
Azimuthal and Single Spin Asymmetries in Hard Scattering Processes
hep-ph 2007-12 conditional novelty 2.0 of 10

Large left-right asymmetries in pion production off polarized protons are best described by a transverse-momentum-dependent Sivers function, but the factorization underpinning single-inclusive hadroproduction remains ...
Transverse-Spin and Transverse-Momentum Effects in High-Energy Processes
hep-ph 2010-11 accept novelty 1.0 of 10

The review consolidates the theory and the HERMES, COMPASS, Belle and RHIC measurements of transverse-spin asymmetries, and the global fits that extract transversity and the Collins function from them.

How the literature uses it

28 arXiv papers cite this in 46 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 citing it · 35 sentences without a confident label

Uses its data or values 2 papers

We consider as new evidence the preliminary data for $A_N$ measured by BRAHMS for $π^±$ production at $√(s) = 200$ GeV [ref] , the data from STAR for $π^0$ production at $√(s) = 200$ GeV [ref] and the latest STAR data for non-isolated $π^0$ production from Ref. [ref] at $√(s) = 200$ GeV and $√(s) = 500$ GeV.

Simultaneous reweighting of Transverse Momentum Dependent distributions · Simultaneous reweighting with $A_N$ data for inclusive pion production · 0.97
Such SSAs have been measured at sufficiently large transverse momentum $P_h⊥$ by the E704 Collaboration at Fermilab [ref] , and the STAR, PHENIX, and BRAHMS collaborations at RHIC [ref] .

An Observation Concerning the Process Dependence of the Sivers Functions · The “sign mismatch" · 0.86

Compares with it 3 papers

Furthermore, the $A_N$ data for non-isolated $π^0$ differ from the corresponding overall $π^0$ inclusive data sample, and from older $A_N$ measurements in similar kinematical regions [ref] , as they do not show the usual pronounced steady increase at large $x_F$ (see also Figs. 6, 7 and 8 of Ref. [ref] for a more exhaustive comparison).

Simultaneous reweighting of Transverse Momentum Dependent distributions · Simultaneous reweighting with $A_N$ data for inclusive pion production · 0.92
We observe that the $x_F$-dependence in both modified and conventional GPM formalisms are different from those observed in the RHIC experiments where larger asymmetries have been observed in the forward direction (large $x_F$) [ref] .

Process dependent Sivers function and implications for single spin asymmetry in inclusive hadron production · Numerical estimate of the SSAs · 0.94
Nevertheless, the increase of the SSA when $z_h$ is moving away from the central value 0.5 has the same physics origin as the observed increase of the SSA as a function of increasing $x_F$ (or rapidity $y$) in the hadronic pion production [ref] , and it could be tested in the COMPASS experiment.

Single transverse-spin asymmetry for $D$-meson production in semi-inclusive deep inelastic scattering · Phenomenology · 0.95

Cites it as support 1 paper

Observations of large transverse SSAs in single-inclusive hadron production in hadronic collisions (such as $p p→hX$), dating back to the 1970s, are further evidence of the importance of twist-3 effects — see, e.g., Refs. [ref] .

Science Requirements and Detector Concepts for the Electron-Ion Collider: EIC Yellow Report · Introduction · 0.99

Cites it as background 5 papers

Since its operation, the forward rapidity region in $pp$ and $dAu$ collisions at the Relativistic Heavy Ion Collider (RHIC) has provided important opportunities to study novel hadronic physics phenomena, from the single transverse spin asymmetry (SSA) in $pp$ collisions [ref] to the small-$x$ gluon saturation in $dAu$ collisions [ref] .

Single Spin Asymmetry Scaling in the Forward Rapidity Region at RHIC · Introduction · 0.99
Historically, TMDs played a crucial role in explaining spin asymmetries [ref] and, in particular, the large value of the so-called left-right ($A_N$) or single-spin asymmetry (SSA) observed in proton-proton collisions [ref] .

Simultaneous reweighting of Transverse Momentum Dependent distributions · Introduction · 0.83
Note that the definition of $A_TU^e$ corresponds to the one of the transverse SSA $A_N$, which has been extensively studied in one-particle inclusive production for hadron-hadron collisions; see [ref] for recent experimental results from RHIC.

Transverse spin asymmetries for W-production in proton-proton collisions · Numerical results · 0.86

Discussion

Know something about this paper? Leave a comment, or highlight any passage above to comment on it.