{"data":{"abstract":{"value":"
Transverse single-spin asymmetries of very forward neutral pions generated in polarized 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 collisions at . The large nonzero asymmetries increasing both in longitudinal momentum fraction and transverse momentum have been observed at low transverse momentum for the first time, at this collision energy. The asymmetries show an approximate scaling in the 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.
","format":"html"},"articleType":"article","authors":[{"type":"Collaboration","name":"RHICf Collaboration"},{"type":"Person","name":"M. H. Kim","firstname":"M. H.","surname":"Kim","affiliationIds":["a1","a2"]},{"type":"Person","name":"O. Adriani","firstname":"O.","surname":"Adriani","affiliationIds":["a3","a4"]},{"type":"Person","name":"E. Berti","firstname":"E.","surname":"Berti","affiliationIds":["a3","a4"]},{"type":"Person","name":"L. Bonechi","firstname":"L.","surname":"Bonechi","affiliationIds":["a4"]},{"type":"Person","name":"R. D’Alessandro","firstname":"R.","surname":"D’Alessandro","affiliationIds":["a3","a4"]},{"type":"Person","name":"Y. Goto","firstname":"Y.","surname":"Goto","affiliationIds":["a2","a5"]},{"type":"Person","name":"B. Hong","firstname":"B.","surname":"Hong","affiliationIds":["a1"]},{"type":"Person","name":"Y. Itow","firstname":"Y.","surname":"Itow","affiliationIds":["a6","a7"]},{"type":"Person","name":"K. Kasahara","firstname":"K.","surname":"Kasahara","affiliationIds":["a8"]},{"type":"Person","name":"J. H. Lee","firstname":"J. H.","surname":"Lee","affiliationIds":["a9"]},{"type":"Person","name":"T. Ljubicic","firstname":"T.","surname":"Ljubicic","affiliationIds":["a9"]},{"type":"Person","name":"Y. Makino","firstname":"Y.","surname":"Makino","affiliationIds":["a6"]},{"type":"Person","name":"H. Menjo","firstname":"H.","surname":"Menjo","affiliationIds":["a10"]},{"type":"Person","name":"I. Nakagawa","firstname":"I.","surname":"Nakagawa","affiliationIds":["a2","a5"]},{"type":"Person","name":"A. Ogawa","firstname":"A.","surname":"Ogawa","affiliationIds":["a9"]},{"type":"Person","name":"J. S. Park","firstname":"J. S.","surname":"Park","affiliationIds":["a2","a11"]},{"type":"Person","name":"T. Sako","firstname":"T.","surname":"Sako","affiliationIds":["a12"]},{"type":"Person","name":"N. Sakurai","firstname":"N.","surname":"Sakurai","affiliationIds":["a13"]},{"type":"Person","name":"K. Sato","firstname":"K.","surname":"Sato","affiliationIds":["a6"]},{"type":"Person","name":"R. Seidl","firstname":"R.","surname":"Seidl","affiliationIds":["a2","a5"]},{"type":"Person","name":"K. Tanida","firstname":"K.","surname":"Tanida","affiliationIds":["a14"]},{"type":"Person","name":"S. Torii","firstname":"S.","surname":"Torii","affiliationIds":["a15"]},{"type":"Person","name":"A. Tricomi","firstname":"A.","surname":"Tricomi","affiliationIds":["a16","a17","a18"]},{"type":"Person","name":"M. Ueno","firstname":"M.","surname":"Ueno","affiliationIds":["a6"]},{"type":"Person","name":"Q. D. Zhou","firstname":"Q. D.","surname":"Zhou","affiliationIds":["a6"]}],"affiliations":[{"name":"Korea University, Seoul 02841, Korea","id":"a1"},{"name":"RIKEN Nishina Center for Accelerator-Based Science, Wako, Saitama 351-0198, Japan","id":"a2"},{"name":"Department of Physics and Astronomy, University of Florence, Sesto Florentino (FI) I-50019, Italy","id":"a3"},{"name":"INFN Section of Florence, Sesto Florentino (FI) I-50019, Italy","id":"a4"},{"name":"RIKEN BNL Research Center, Brookhaven National Laboratory, Upton, New York 11973-5000, USA","id":"a5"},{"name":"Institute for Space-Earth Environmental Research, Nagoya University, Nagoya, Aichi 464-8601, Japan","id":"a6"},{"name":"Kobayashi-Maskawa Institute for the Origin of Particles and the Universe, Nagoya University, Nagoya, Aichi 464-8602, Japan","id":"a7"},{"name":"Shibaura Institue of Technology, 307 Fukasaku, Minuma-ku, Saitama 337-8570, Japan","id":"a8"},{"name":"Brookhaven National Laboratory, Upton, New York 11973-5000, USA","id":"a9"},{"name":"Graduate school of Science, Nagoya University, Nagoya, Aichi 464-8601, Japan","id":"a10"},{"name":"Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea","id":"a11"},{"name":"Institute for Cosmic Ray Research, University of Tokyo, Kashiwa, Chiba 277-8582, Japan","id":"a12"},{"name":"Tokushima University, Tokushima, Tokushima 770-8051, Japan","id":"a13"},{"name":"Advanced Science Research Center, Japan Atomic Energy Agency, 21 2-4 Shirakata Shirane, Tokai-mura, Naka-gun, Ibaraki 319-1195, Japan","id":"a14"},{"name":"RISE, Waseda University, Shinjuku, Tokyo 162-0044, Japan","id":"a15"},{"name":"Department of Physics and Astronomy, University of Catania, Catania I-95123, Italy","id":"a16"},{"name":"INFN Section of Catania, Catania I-95123, Italy","id":"a17"},{"name":"CSFNSM, Catania I-95123, Italy","id":"a18"}],"notes":[{"format":"html","value":"Present address: Institute of Particle and Nuclear Studies, High Energy Accelerator Research Organization (KEK), Tsukuba, Ibaraki 305-0801, Japan.
","label":"*","id":"n1","type":"contrib"}],"date":"2020-06-22","fundings":[{"funderId":"http://dx.doi.org/10.13039/501100001691","funderName":"Japan Society for the Promotion of Science","awards":["JP26247037","JP18H01227"]},{"funderId":"http://dx.doi.org/10.13039/501100004721","funderName":"Institute for Cosmic Ray Research, University of Tokyo","awards":[]},{"funderId":"http://dx.doi.org/10.13039/501100003725","funderName":"National Research Foundation of Korea","awards":["2016R1A2B2008505","2018R1A5A1025563"]},{"funderId":null,"funderName":"U.S.-Japan Science and Technology Cooperation Program in High Energy Physics","awards":[]},{"funderId":null,"funderName":"UNICT 2020-22 Linea 2","awards":[]}],"type":"article","metadata_last_modified_at":"2020-12-17T15:02:30+0000","last_modified_at":"2020-12-17T15:02:30+0000","id":"10.1103/PhysRevLett.124.252501","identifiers":{"doi":"10.1103/PhysRevLett.124.252501","arxiv":"arXiv:2003.04283"},"issue":{"number":"25"},"pageStart":"252501","hasArticleId":true,"numPages":6,"classificationSchemes":{"physh":{"concepts":[{"id":"aff93223-66f4-4a9a-8285-2bd2b8a714a9","facet":{"id":"bdb1ef91-b776-4e36-8f8f-3e93666bac1e"},"primary":false},{"id":"4214927b-d43a-4eac-8975-f610cb1cc8e9","facet":{"id":"bdb1ef91-b776-4e36-8f8f-3e93666bac1e"},"primary":true}],"disciplines":["0213a5a0-0742-43f3-804b-3ccea08a13c0"]}},"publisher":{"name":"APS"},"rights":{"rightsStatement":"Published by the American Physical Society","copyrightYear":2020,"copyrightHolders":[],"creativeCommons":true,"licenses":[{"url":"https://creativecommons.org/licenses/by/4.0/","licenseStatement":"Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3."}]},"journal":{"id":"PRL","abbreviatedName":"Phys. Rev. Lett.","name":"Physical Review Letters"},"title":{"value":"Transverse Single-Spin Asymmetry for Very Forward Neutral Pion Production in Polarized Collisions at ","format":"html"},"tocSection":{"label":"Nuclear Physics"},"volume":{"number":"124"}}}