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Up and down quark structure of the proton

We report an improved measurement of the valence u and d quark distributions from the forward-backward asymmetry in the Drell-Yan process using 8.6 fb−1 of data collected with the D0 detector in pp¯ collisions at s=1.96. This analysis provides the values of new structure parameters that are directly related to the valence up and down quark distributions in the proton. In other experimental results measuring the quark content of the proton, d quark contributions are mixed with those from other quark flavors. In this measurement, the u and d quark contributions are separately extracted by applying a factorization of the QCD and electroweak portions of the forward-backward asymmetry. Published by the American Physical Society 2024

American Physical Society (APS)

V. M. Abazov B. Abbott B. S. Acharya M. Adams T. Adams J. P. Agnew G. D. Alexeev G. Alkhazov A. Alton A. Askew S. Atkins K. Augsten C. Avila F. Badaud L. Bagby B. Baldin D. V. Bandurin S. Banerjee E. Barberis P. Baringer J. F. Bartlett U. Bassler V. Bazterra A. Bean M. Begalli L. Bellantoni S. B. Beri G. Bernardi R. Bernhard I. Bertram M. Besançon R. Beuselinck P. C. Bhat S. Bhatia V. Bhatnagar G. Blazey S. Blessing K. Bloom A. Boehnlein D. Boline E. E. Boos G. Borissov A. Brandt O. Brandt M. Brochmann R. Brock A. Bross D. Brown X. B. Bu M. Buehler V. Buescher V. Bunichev S. Burdin C. P. Buszello E. Camacho-Pérez B. C. K. Casey H. Castilla-Valdez S. Caughron S. Chakrabarti K. M. Chan A. Chandra E. Chapon G. Chen S. W. Cho S. Choi B. Choudhary S. Cihangir D. Claes J. Clutter M. Cooke W. E. Cooper M. Corcoran F. Couderc M.-C. Cousinou J. Cuth D. Cutts A. Das G. Davies S. J. de Jong E. De La Cruz-Burelo F. Déliot R. Demina D. Denisov S. P. Denisov S. Desai C. Deterre K. DeVaughan H. T. Diehl M. Diesburg P. F. Ding A. Dominguez A. Drutskoy A. Dubey L. V. Dudko A. Duperrin S. Dutt M. Eads D. Edmunds J. Ellison V. D. Elvira Y. Enari H. Evans A. Evdokimov V. N. Evdokimov A. Fauré L. Feng T. Ferbel F. Fiedler F. Filthaut W. Fisher H. E. Fisk M. Fortner H. Fox J. Franc S. Fuess P. H. Garbincius A. Garcia-Bellido J. A. García-González V. Gavrilov W. Geng C. E. Gerber Y. Gershtein G. Ginther G. Golovanov P. D. Grannis S. Greder H. Greenlee G. Grenier Ph. Gris J.-F. Grivaz A. Grohsjean S. Grünendahl M. W. Grünewald T. Guillemin G. Gutierrez P. Gutierrez J. Haley L. Han K. Harder A. Harel J. M. Hauptman J. Hays T. Head T. Hebbeker D. Hedin H. Hegab A. P. Heinson U. Heintz C. Hensel I. Heredia-De La Cruz K. Herner G. Hesketh M. D. Hildreth R. Hirosky T. Hoang J. D. Hobbs B. Hoeneisen J. Hogan M. Hohlfeld J. L. Holzbauer I. Howley Z. Hubacek V. Hynek I. Iashvili Y. Ilchenko R. Illingworth A. S. Ito S. Jabeen M. Jaffré A. Jayasinghe M. S. Jeong R. Jesik P. Jiang K. Johns E. Johnson M. Johnson A. Jonckheere P. Jonsson J. Joshi A. W. Jung A. Juste E. Kajfasz D. Karmanov I. Katsanos M. Kaur R. Kehoe S. Kermiche N. Khalatyan A. Khanov A. Kharchilava Y. N. Kharzheev I. Kiselevich J. M. Kohli A. V. Kozelov J. Kraus A. Kumar A. Kupco T. Kurča V. A. Kuzmin S. Lammers P. Lebrun H. S. Lee S. W. Lee W. M. Lee X. Lei J. Lellouch D. Li H. Li L. Li Q. Z. Li J. K. Lim D. Lincoln J. Linnemann V. V. Lipaev R. Lipton H. Liu Y. Liu A. Lobodenko M. Lokajicek R. Lopes de Sa R. Luna-Garcia A. L. Lyon A. K. A. Maciel R. Madar R. Magaña-Villalba S. Malik V. L. Malyshev J. Mansour J. Martínez-Ortega R. McCarthy C. L. McGivern M. M. Meijer A. Melnitchouk D. Menezes P. G. Mercadante M. Merkin A. Meyer J. Meyer F. Miconi N. K. Mondal M. Mulhearn E. Nagy M. Narain R. Nayyar H. A. Neal J. P. Negret P. Neustroev H. T. Nguyen T. Nunnemann J. Orduna N. Osman A. Pal N. Parashar V. Parihar S. K. Park R. Partridge N. Parua A. Patwa B. Penning M. Perfilov Y. Peters K. Petridis G. Petrillo P. Pétroff M.-A. Pleier V. M. Podstavkov A. V. Popov M. Prewitt D. Price N. Prokopenko J. Qian A. Quadt B. Quinn P. N. Ratoff I. Razumov I. Ripp-Baudot F. Rizatdinova M. Rominsky A. Ross C. Royon P. Rubinov R. Ruchti G. Sajot A. Sánchez-Hernández M. P. Sanders A. S. Santos G. Savage L. Sawyer T. Scanlon R. D. Schamberger Y. Scheglov H. Schellman M. Schott C. Schwanenberger R. Schwienhorst J. Sekaric H. Severini E. Shabalina V. Shary S. Shaw A. A. Shchukin V. Simak P. Skubic P. Slattery G. R. Snow J. Snow S. Snyder S. Söldner-Rembold L. Sonnenschein K. Soustruznik J. Stark D. A. Stoyanova M. Strauss L. Suter P. Svoisky M. Titov V. V. Tokmenin Y.-T. Tsai D. Tsybychev B. Tuchming C. Tully L. Uvarov S. Uvarov S. Uzunyan R. Van Kooten W. M. van Leeuwen N. Varelas E. W. Varnes I. A. Vasilyev A. Y. Verkheev L. S. Vertogradov M. Verzocchi M. Vesterinen D. Vilanova P. Vokac H. D. Wahl C. Wang M. H. L. S. Wang J. Warchol G. Watts M. Wayne J. Weichert L. Welty-Rieger M. R. J. Williams G. W. Wilson M. Wobisch D. R. Wood T. R. Wyatt M. Xie Y. Xie R. Yamada S. Yang T. Yasuda Y. A. Yatsunenko W. Ye Z. Ye H. Yin K. Yip S. W. Youn J. M. Yu J. Zennamo T. G. Zhao B. Zhou J. Zhu M. Zielinski D. Zieminska L. Zivkovic

Physical Review D

2024

Title: Up and down quark structure of the proton

Description:

We report an improved measurement of the valence u and d quark distributions from the forward-backward asymmetry in the Drell-Yan process using 8.

6 fb−1 of data collected with the D0 detector in pp¯ collisions at s=1.

96.

This analysis provides the values of new structure parameters that are directly related to the valence up and down quark distributions in the proton.

In other experimental results measuring the quark content of the proton, d quark contributions are mixed with those from other quark flavors.

In this measurement, the u and d quark contributions are separately extracted by applying a factorization of the QCD and electroweak portions of the forward-backward asymmetry.

Published by the American Physical Society 2024.

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Up and down quark structure of the proton

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