Polarization of prompt J/psi in pp -> J/psi+X at sqrt{s}=200 GeV

Chaehyun Yu (KIAS); Hee Sok Chung (Korea U.); Jungil Lee (Korea U.); Seyong Kim (Sejong U.)

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Polarization of prompt J/psi in pp -> J/psi+X at sqrt{s}=200 GeV

Hee Sok Chung (Korea U.), Seyong Kim (Sejong U.), Jungil Lee (Korea U.), Chaehyun Yu (KIAS)

High Energy Physics - Phenomenology · Submitted 9 Dec 2010

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The authors' main claim We predict slight transverse polarization of J/psi in the forward-rapidity region, while that for the mid-rapidity region is slightly longitudinal.

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arXiv ID1012.1954 (version 2)

Pith IDZYASZ66V, Pith's permanent record of this paper and its review

CitationChaehyun Yu (KIAS), Hee Sok Chung (Korea U.), Jungil Lee (Korea U.), Seyong Kim (Sejong U.). "Polarization of prompt J/psi in pp -> J/psi+X at sqrt{s}=200 GeV." arXiv:1012.1954 (2010). https://pith.science/paper/ZYASZ66V

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What the abstract itself states, as probabilities: claims first 0.02 · states limitation 0.28 · human participants 0.01 · controlled comparison 0.13 · randomized assignment 0.01 · states quantitative result 0.35 · compares with prior results 0.98 · mentions code or data availability 0.02.

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Within the framework of the nonrelativistic QCD factorization approach, we compute the cross section and polarization of prompt J/psi produced from proton-proton collisions at the center-of-momentum energy sqrt{s}=200 GeV. We present the transverse-momentum distribution in the forward-rapidity region 1.2 < |y| < 2.2 and the rapidity distribution over the transverse-momentum range 2 GeV < p_T < 20 GeV. The perturbative contributions are computed at leading order in the strong coupling constant. We predict slight transverse polarization of J/psi in the forward-rapidity region, while that for the mid-rapidity region is slightly longitudinal. The transverse-momentum distribution agrees well with the PHENIX preliminary data and the color-singlet-model prediction at next-to-leading order in alpha_s, but disagrees with the result from the leading-order color-singlet model or the s-channel-cut method.

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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	Within the framework of the nonrelativistic QCD factorization approach, we compute the cross section and polarization of prompt J/psi produced from proton-proton collisions at the center-of-momentum energy sqrt{s}=200 GeV.	contribution 0.86	0.95	0.06	asserted 0.99
s1	We present the transverse-momentum distribution in the forward-rapidity region 1.2 < \|y\| < 2.2 and the rapidity distribution over the transverse-momentum range 2 GeV < p_T < 20 GeV.	contribution 0.75	0.88	0.04	asserted 0.98
s2	The perturbative contributions are computed at leading order in the strong coupling constant.	method 1.00	0.88	0.03	asserted 1.00
s3	We predict slight transverse polarization of J/psi in the forward-rapidity region, while that for the mid-rapidity region is slightly longitudinal.	result 1.00	0.92	0.72	asserted 0.89
s4	The transverse-momentum distribution agrees well with the PHENIX preliminary data and the color-singlet-model prediction at next-to-leading order in alpha_s, but disagrees with the result from the leading-order color-singlet model or the s-channel-cut method.	result 0.94	0.73	0.21	asserted 0.99

What kind of paper the classifier reports this is: theoretical result 0.92 · evidence from simulation or computation 0.99.

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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

Within the framework of the nonrelativistic QCD factorization approach, we compute the cross section and polarization of prompt J/psi produced from proton-proton collisions at the center-of-momentum energy sqrt{s}=200 GeV. We present the transverse-momentum distribution in the forward-rapidity region 1.2 < |y| < 2.2 and the rapidity distribution over the transverse-momentum range 2 GeV < p_T < 20 GeV. The perturbative contributions are computed at leading order in the strong coupling constant. We predict slight transverse polarization of J/psi in the forward-rapidity region, while that for the mid-rapidity region is slightly longitudinal. The transverse-momentum distribution agrees well with the PHENIX preliminary data and the color-singlet-model prediction at next-to-leading order in alpha_s, but disagrees with the result from the leading-order color-singlet model or the s-channel-cut method.

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References

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3 arXiv papers cite this in 3 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 · 2 sentences without a confident label

Cites it as background 1 paper

This four-LDME phenomenology has long been a standard for NRQCD-based description of spin-triplet $S$-wave heavy quarkonia [ref] .

Inclusive production of $J/\psi$, $\psi(2S)$, and $\Upsilon$ states in pNRQCD · NRQCD factorization formula · 0.99

What it cites · 44 sentences without a confident label

Contests 2 papers

However, the PHENIX preliminary data in Ref. [ref] for the forward-rapidity region $1.2<|y|<2.2$ disfavor the s-channel-cut prediction [ref] .

Quarkonia measurement in p+p and d+Au collisions at sqrt(s)=200 GeV by PHENIX Detector · Introduction · contest 0.72
However, the PHENIX preliminary data in Ref. [ref] for the forward-rapidity region $1.2<|y|<2.2$ disfavor the s-channel-cut prediction [ref] .

J/psi production at the Tevatron and RHIC from s-channel cut · Introduction · contest 0.72

Builds on 1 paper

The perturbative contributions are computed at LO in $α_s$, like the previous analysis in Ref. [ref] , in which the cross section and polarization in the midrapidity region $|y|<0.35$ within the $p_T$ range $1.5 GeV<p_T<5 GeV$ are predicted in detail.

Polarization of prompt J/psi in proton-proton collisions at RHIC · Introduction · 0.89

Uses the method or tool of 1 paper

The basic strategy to compute the cross section and polarization parameter $α$ can be found in Ref. [ref] .

Polarization of prompt J/psi in proton-proton collisions at RHIC · $p_T$ distributions · 0.98

Uses data or values from 3 papers

We use numerical values for the NRQCD matrix elements (ME) given in Ref. [ref] .

Polarization of Prompt J/psi at the Tevatron · $p_T$ distributions · 1.00
The transverse mass $m_T=(4 m_c^2 + p_T^2)^1/2$ is used for both the factorization and renormalization scales $μ$ with the charm-quark mass $m_c=1.5$ GeV. $α_s$ is evaluated from the one-loop formula using the value of $Λ_QCD$ given in each PDF set [ref] .

Parton distributions: a new global analysis · $p_T$ distributions · 0.86
The transverse mass $m_T=(4 m_c^2 + p_T^2)^1/2$ is used for both the factorization and renormalization scales $μ$ with the charm-quark mass $m_c=1.5$ GeV. $α_s$ is evaluated from the one-loop formula using the value of $Λ_QCD$ given in each PDF set [ref] .

Global QCD Analysis of Parton Structure of the Nucleon: CTEQ5 Parton Distributions · $p_T$ distributions · 0.86

Compares with 3 papers

Our results for the polarization agree with the PHENIX preliminary data [ref] and are also compatible with the CSM prediction at NLO [ref] , which has larger uncertainties than the NRQCD prediction.

Quarkonia measurement in p+p and d+Au collisions at sqrt(s)=200 GeV by PHENIX Detector · $p_T$ distributions · 0.98
Our results for the polarization agree with the PHENIX preliminary data [ref] and are also compatible with the CSM prediction at NLO [ref] , which has larger uncertainties than the NRQCD prediction.

QCD corrections to J/psi polarisation in pp collisions at RHIC · $p_T$ distributions · 0.98
Our polarization prediction is less transverse as that of the s-channel-cut method [ref] ($α=0.36$), but is compatible with the NLO CSM prediction [ref] , which has larger uncertainties than our results.

J/psi production at the Tevatron and RHIC from s-channel cut · Summary · 0.98

Cites as background 2 papers

The color-singlet-model (CSM) prediction for the direct $J/ψ$ production rate has been computed at next-to-leading order (NLO) in the strong coupling $α_s$ [ref] , including contributions from $cg$ fusion.

QCD corrections to J/psi polarisation in pp collisions at RHIC · Introduction · 0.81
The color-singlet-model (CSM) prediction for the direct $J/ψ$ production rate has been computed at next-to-leading order (NLO) in the strong coupling $α_s$ [ref] , including contributions from $cg$ fusion.

Heavy-Quarkonium Production in High Energy Proton-Proton Collisions at RHIC · Introduction · 0.81

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