CJ15 global PDF analysis with new electroweak data from the STAR and SeaQuest experiments

Conference · Thu Jul 01 04:00:00 EDT 2021

OSTI ID:1922455

Park, Sanghwa ^[1]; Accardi, Alberto ^[2]; Jing, Xiaoxian ^[3]; Owens, J.F. ^[4]

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1. Stony Brook University
2. Hampton Univ., Hampton, VA (United States); Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States)
3. Thomas Jefferson National Accelerator Facility (TJNAF), Newport News, VA (United States); Southern Methodist Univ., Dallas, TX (United States)
4. Florida State Univ., Tallahassee, FL (United States)

We present updates to a recent CTEQ-Jefferson Lab (CJ) global analysis of parton distribution functions with a new set of electroweak data that provide unique access to quark flavor separation in the proton. In particular, recent W and Z boson measurements from the STAR experiment at RHIC put additional constraints on light quarks and antiquarks near the valence regime. The new measurement of the Drell-Yan lepton pair production ratio in p+p and p+d collisions by the SeaQuest experiment at Fermilab extends the large-x coverage of the previous E866 experiment and sheds new light on the light antiquarks distribution. In this report, the impact of these new data sets on parton distribution functions will be presented with emphasis given to the flavor asymmetry of the light antiquark sea at large values of the parton momentum x.

• Research Organization: Thomas Jefferson National Accelerator Facility, Newport News, VA (United States)
• Sponsoring Organization: USDOE Office of Science (SC), Nuclear Physics (NP)
• DOE Contract Number: AC05-06OR23177
• OSTI ID: 1922455
• Report Number(s): JLAB-THY-21-3465; arXiv:2108.05786; DOE/OR/23177-5276; DE-SC0008791; DE-SC0010129
• Country of Publication: United States
• Language: English