Transverse Single-Spin Asymmetry for Very Forward Neutral Pion Production in Polarized p+p Collisions at sqrt[s]=510 GeV.

Journal

Physical review letters
ISSN: 1079-7114
Titre abrégé: Phys Rev Lett
Pays: United States
ID NLM: 0401141

Informations de publication

Date de publication:
26 Jun 2020
Historique:
received: 08 03 2020
accepted: 19 05 2020
entrez: 9 7 2020
pubmed: 9 7 2020
medline: 9 7 2020
Statut: ppublish

Résumé

Transverse single-spin asymmetries of very forward neutral pions generated in polarized p+p collisions allow us to understand the production mechanism in terms of perturbative and nonperturbative strong interactions. During 2017, the RHICf Collaboration installed an electromagnetic calorimeter in the zero-degree region of the STAR detector at the Relativistic Heavy Ion Collider (RHIC) and measured neutral pions produced at pseudorapidity larger than 6 in polarized p+p collisions at sqrt[s]=510  GeV. The large nonzero asymmetries increasing both in longitudinal momentum fraction x_{F} and transverse momentum p_{T} have been observed at low transverse momentum p_{T}<1  GeV/c for the first time, at this collision energy. The asymmetries show an approximate x_{F} scaling in the p_{T} region where nonperturbative processes are expected to dominate. A non-negligible contribution from soft processes may be necessary to explain the nonzero neutral pion asymmetries.

Identifiants

DOI: 10.1103/PhysRevLett.124.252501 PMID: 32639790
pubmed: 32639790
doi: 10.1103/PhysRevLett.124.252501
doi:

Types de publication

Journal Article

Langues

eng

Sous-ensembles de citation

IM

Pagination

252501

Auteurs

M H Kim (MH)

Korea University, Seoul 02841, Korea.
RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.

O Adriani (O)

Department of Physics and Astronomy, University of Florence, Sesto Florentino (FI) I-50019, Italy.
INFN Section of Florence, Sesto Florentino (FI) I-50019, Italy.

E Berti (E)

Department of Physics and Astronomy, University of Florence, Sesto Florentino (FI) I-50019, Italy.
INFN Section of Florence, Sesto Florentino (FI) I-50019, Italy.

L Bonechi (L)

INFN Section of Florence, Sesto Florentino (FI) I-50019, Italy.

R D'Alessandro (R)

Department of Physics and Astronomy, University of Florence, Sesto Florentino (FI) I-50019, Italy.
INFN Section of Florence, Sesto Florentino (FI) I-50019, Italy.

Y Goto (Y)

RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.

B Hong (B)

Korea University, Seoul 02841, Korea.

Y Itow (Y)

Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Aichi 464-8601, Japan.
Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya, Aichi 464-8602, Japan.

K Kasahara (K)

Shibaura Institue of Technology, 307 Fukasaku, Minuma-ku, Saitama 337-8570, Japan.

J H Lee (JH)

Brookhaven National Laboratory, Upton, New York 11973-5000, USA.

T Ljubicic (T)

Brookhaven National Laboratory, Upton, New York 11973-5000, USA.

Y Makino (Y)

Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Aichi 464-8601, Japan.

H Menjo (H)

Graduate school of Science, Nagoya University, Nagoya, Aichi 464-8601, Japan.

I Nakagawa (I)

RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.

A Ogawa (A)

Brookhaven National Laboratory, Upton, New York 11973-5000, USA.

J S Park (JS)

RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea.

T Sako (T)

Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan.

N Sakurai (N)

Tokushima University, Tokushima, Tokushima 770-8051, Japan.

K Sato (K)

Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Aichi 464-8601, Japan.

R Seidl (R)

RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan.
RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA.

K Tanida (K)

Advanced Science Research Center, Japan Atomic Energy Agency, 21 2-4 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan.

S Torii (S)

RISE, Waseda University, Shinjuku, Tokyo 162-0044, Japan.

A Tricomi (A)

Department of Physics and Astronomy, University of Catania, Catania I-95123, Italy.
INFN Section of Catania, Catania I-95123, Italy.

M Ueno (M)

Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Aichi 464-8601, Japan.

Q D Zhou (QD)

Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Aichi 464-8601, Japan.

Classifications MeSH