Diffractive longitudinal structure function at the Electron Ion Collider

Néstor Armesto; Paul R. Newman; Wojciech Słomiński; Anna M. Staśto

doi:10.1103/PhysRevD.105.074006

Diffractive longitudinal structure function at the Electron Ion Collider

Néstor Armesto, Paul R. Newman, Wojciech Słomiński, Anna M. Staśto

Physics and Astronomy

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Abstract

Possibilities for the measurement of the longitudinal structure function in diffraction F_L^D at the future U.S. Electron Ion Collider are investigated. The sensitivity to F_L^D arises from the variation of the reduced diffractive cross section with center-of-mass energy. Simulations are performed with various sets of beam energy combinations and for different assumptions on the precision of the diffractive cross section measurements. Scenarios compatible with current EIC performance expectations lead to an unprecedented precision on F_L^D at the 5-10% level in the best measured regions. While scenarios with data at a larger number of center-of-mass energies allow the extraction of F_L^D in the widest kinematic domain and with the smallest uncertainties, even the more conservative assumptions lead to precise measurements. The ratio R^D of photoabsorption cross sections for longitudinally to transversely polarized photons can also be obtained with high precision using a separate extraction method.

Original language	English
Article number	074006
Number of pages	15
Journal	Physical Review D
Volume	105
Issue number	7
DOIs	https://doi.org/10.1103/PhysRevD.105.074006
Publication status	Published - 1 Apr 2022

Bibliographical note

Funding Information:
We thank Alex Jentsch, Hannes Jung, Kolja Kauder, and Mark Strikman for useful discussions. N. A. acknowledges financial support by Xunta de Galicia (Centro singular de investigación de Galicia accreditation 2019-2022); the “María de Maeztu” Units of Excellence program MDM2016-0692 and the Spanish Research State Agency under Project No. FPA2017-83814-P; European Union ERDF; the European Research Council under Project No. ERC-2018-ADG-835105 YoctoLHC; Marie Skłodowska-Curie Research and Innovation Staff Exchange (MSCA RISE) 823947 “Heavy ion collisions: collectivity and precision in saturation physics” (HIEIC); and European Union’s Horizon 2020 research and innovation programme under grant agreement No. 824093. A. M. S. is supported by the U.S. Department of Energy grant No. DE-SC-0002145 and in part by National Science Centre in Poland, Grant No. 2019/33/B/ST2/02588.

Publisher Copyright:
© 2022 authors. Published by the American Physical Society..

ASJC Scopus subject areas

Physics and Astronomy (miscellaneous)

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Cite this

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title = "Diffractive longitudinal structure function at the Electron Ion Collider",

abstract = "Possibilities for the measurement of the longitudinal structure function in diffraction FLD at the future U.S. Electron Ion Collider are investigated. The sensitivity to FLD arises from the variation of the reduced diffractive cross section with center-of-mass energy. Simulations are performed with various sets of beam energy combinations and for different assumptions on the precision of the diffractive cross section measurements. Scenarios compatible with current EIC performance expectations lead to an unprecedented precision on FLD at the 5-10% level in the best measured regions. While scenarios with data at a larger number of center-of-mass energies allow the extraction of FLD in the widest kinematic domain and with the smallest uncertainties, even the more conservative assumptions lead to precise measurements. The ratio RD of photoabsorption cross sections for longitudinally to transversely polarized photons can also be obtained with high precision using a separate extraction method.",

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note = "Funding Information: We thank Alex Jentsch, Hannes Jung, Kolja Kauder, and Mark Strikman for useful discussions. N. A. acknowledges financial support by Xunta de Galicia (Centro singular de investigaci{\'o}n de Galicia accreditation 2019-2022); the “Mar{\'i}a de Maeztu” Units of Excellence program MDM2016-0692 and the Spanish Research State Agency under Project No. FPA2017-83814-P; European Union ERDF; the European Research Council under Project No. ERC-2018-ADG-835105 YoctoLHC; Marie Sk{\l}odowska-Curie Research and Innovation Staff Exchange (MSCA RISE) 823947 “Heavy ion collisions: collectivity and precision in saturation physics” (HIEIC); and European Union{\textquoteright}s Horizon 2020 research and innovation programme under grant agreement No. 824093. A. M. S. is supported by the U.S. Department of Energy grant No. DE-SC-0002145 and in part by National Science Centre in Poland, Grant No. 2019/33/B/ST2/02588. Publisher Copyright: {\textcopyright} 2022 authors. Published by the American Physical Society..",

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Diffractive longitudinal structure function at the Electron Ion Collider

Abstract

Bibliographical note

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