@article{0290e6968c894e17b01eb5561f351ad3,
title = "Measurement of Direct-Photon Cross Section and Double-Helicity Asymmetry at s =510 GeV in p → + p → Collisions",
abstract = "We present measurements of the cross section and double-helicity asymmetry ALL of direct-photon production in p→+p→ collisions at s=510 GeV. The measurements have been performed at midrapidity (|η|<0.25) with the PHENIX detector at the Relativistic Heavy Ion Collider. At relativistic energies, direct photons are dominantly produced from the initial quark-gluon hard scattering and do not interact via the strong force at leading order. Therefore, at s=510 GeV, where leading-order-effects dominate, these measurements provide clean and direct access to the gluon helicity in the polarized proton in the gluon-momentum-fraction range 0.02",
author = "{PHENIX Collaboration} and Abdulameer, {N. J.} and U. Acharya and A. Adare and C. Aidala and Ajitanand, {N. N.} and Y. Akiba and R. Akimoto and M. Alfred and N. Apadula and Y. Aramaki and H. Asano and Atomssa, {E. T.} and Awes, {T. C.} and B. Azmoun and V. Babintsev and M. Bai and Bandara, {N. S.} and B. Bannier and Barish, {K. N.} and S. Bathe and A. Bazilevsky and M. Beaumier and S. Beckman and R. Belmont and A. Berdnikov and Y. Berdnikov and L. Bichon and D. Black and B. Blankenship and Bok, {J. S.} and V. Borisov and K. Boyle and Brooks, {M. L.} and J. Bryslawskyj and H. Buesching and V. Bumazhnov and S. Campbell and {Canoa Roman}, V. and Chen, {C. H.} and M. Chiu and Chi, {C. Y.} and Choi, {I. J.} and Choi, {J. B.} and T. Chujo and Z. Citron and M. Connors and R. Corliss and {Grosse Perdekamp}, M. and Peng, {J. C.} and A. Sickles",
note = "We thank the staff of the Collider-Accelerator and Physics Departments at Brookhaven National Laboratory and the staff of the other PHENIX participating institutions for their vital contributions. We also thank W. Vogelsang for providing the code for direct photon asymmetry calculations. We acknowledge support from the Office of Nuclear Physics in the Office of Science of the Department of Energy, the National Science Foundation, Abilene Christian University Research Council, Research Foundation of SUNY, and Dean of the College of Arts and Sciences, Vanderbilt University (U.S.A), Ministry of Education, Culture, Sports, Science, and Technology and the Japan Society for the Promotion of Science (Japan), Natural Science Foundation of China (People{\textquoteright}s Republic of China), Croatian Science Foundation and Ministry of Science and Education (Croatia), Ministry of Education, Youth and Sports (Czech Republic), Centre National de la Recherche Scientifique, Commissariat {\`a} l{\textquoteright}{\'E}nergie Atomique, and Institut National de Physique Nucl{\'e}aire et de Physique des Particules (France), J. Bolyai Research Scholarship, EFOP, the New National Excellence Program ({\'U}NKP), NKFIH, and OTKA (Hungary), Department of Atomic Energy and Department of Science and Technology (India), Israel Science Foundation (Israel), Basic Science Research and SRC(CENuM) Programs through NRF funded by the Ministry of Education and the Ministry of Science and ICT (Korea), Physics Department, Lahore University of Management Sciences (Pakistan), Ministry of Education and Science, Russian Academy of Sciences, Federal Agency of Atomic Energy (Russia), VR and Wallenberg Foundation (Sweden), University of Zambia, the Government of the Republic of Zambia (Zambia), the U.S. Civilian Research and Development Foundation for the Independent States of the Former Soviet Union, the Hungarian American Enterprise Scholarship Fund, the US-Hungarian Fulbright Foundation, and the US-Israel Binational Science Foundation.",
year = "2023",
month = jun,
day = "23",
doi = "10.1103/PhysRevLett.130.251901",
language = "English (US)",
volume = "130",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "25",
}