Abstract
The transversity distribution, which describes transversely polarized quarks in transversely polarized nucleons, is a fundamental component of the spin structure of the nucleon, and is only loosely constrained by global fits to existing semi-inclusive deep inelastic scattering (SIDIS) data. In transversely polarized p↑+p collisions it can be accessed using transverse polarization dependent fragmentation functions which give rise to azimuthal correlations between the polarization of the struck parton and the final state scalar mesons. This letter reports on spin dependent di-hadron correlations measured by the STAR experiment. The new dataset corresponds to 25 pb−1 integrated luminosity of p↑+p collisions at s=500 GeV, an increase of more than a factor of ten compared to our previous measurement at s=200 GeV. Non-zero asymmetries sensitive to transversity are observed at a Q2 of several hundred GeV and are found to be consistent with the former measurement and a model calculation. We expect that these data will enable an extraction of transversity with comparable precision to current SIDIS datasets but at much higher momentum transfers where subleading effects are suppressed.
Original language | English |
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Pages (from-to) | 332-339 |
Number of pages | 8 |
Journal | Physics Letters B |
Volume | 780 |
DOIs | |
State | Published - May 10 2018 |
Externally published | Yes |
Funding
We thank Marco Radici and Alessandro Bacchetta from the Department of Physics at the University of Pavia for helpful discussions and for providing theory curves for this work. We thank the RHIC Operations Group and RCF at BNL , the NERSC Center at LBNL , and the Open Science Grid Consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science , the U.S. National Science Foundation , the Ministry of Education and Science of the Russian Federation , National Natural Science Foundation of China , Chinese Academy of Sciences , the Ministry of Science and Technology of China and the Chinese Ministry of Education , the National Research Foundation of Korea , GA and MSMT of the Czech Republic, Department of Atomic Energy and Department of Science and Technology of the Government of India; the National Science Centre of Poland , National Research Foundation , the Ministry of Science, Education and Sports of the Republic of Croatia, ROSATOM of Russia and German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie ( BMBF ) and the Helmholtz Association . We thank Marco Radici and Alessandro Bacchetta from the Department of Physics at the University of Pavia for helpful discussions and for providing theory curves for this work. We thank the RHIC Operations Group and RCF at BNL, the NERSC Center at LBNL, and the Open Science Grid Consortium for providing resources and support. This work was supported in part by the Office of Nuclear Physics within the U.S. DOE Office of Science, the U.S. National Science Foundation, the Ministry of Education and Science of the Russian Federation, National Natural Science Foundation of China, Chinese Academy of Sciences, the Ministry of Science and Technology of China and the Chinese Ministry of Education, the National Research Foundation of Korea, GA and MSMT of the Czech Republic, Department of Atomic Energy and Department of Science and Technology of the Government of India; the National Science Centre of Poland, National Research Foundation, the Ministry of Science, Education and Sports of the Republic of Croatia, ROSATOM of Russia and German Bundesministerium fur Bildung, Wissenschaft, Forschung and Technologie (BMBF) and the Helmholtz Association.
Funders | Funder number |
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National Science Foundation | 1613939 |
Rose Community Foundation | |
Office of Science | |
Nuclear Physics | |
Brookhaven National Laboratory | |
Lawrence Berkeley National Laboratory | |
Ministry of Science and Technology | |
FP7 Coordination of Non-Community Research Programmes | |
National Research Foundation | |
National Research Foundation | |
Department of Science and Technology, Ministry of Science and Technology, India | |
National Natural Science Foundation of China | |
Ministerstvo Školství, Mládeže a Tělovýchovy | |
Ministry of Education of the People's Republic of China | |
Bundesministerium für Bildung und Forschung | |
Chinese Academy of Sciences | |
Ministry of Science and Technology of the People's Republic of China | |
Ministarstvo Obrazovanja, Znanosti i Sporta | |
Ministry of Education and Science of the Russian Federation | |
National Research Foundation of Korea | |
Narodowe Centrum Nauki | |
Department of Science and Technology, Government of Kerala | |
Ministarstvo Znanosti, Obrazovanja i Sporta | |
Bundesministerium für Bildung und Frauen | |
State Atomic Energy Corporation ROSATOM | |
Helmholtz Association | |
Bundesministerium für Bildung, Wissenschaft, Forschung und Technologie |
Keywords
- Di-hadron correlations
- Interference fragmentation function
- Transversity