Salajegheh, Maral and Khanpour, Hamzeh and Nejad, S. Mohammad Moosavi (2017) Improved determination of ¯ d ( x ) − ¯ u ( x ) flavor asymmetry in the proton by data from the BONuS experiment at JLAB and using an approach by Brodsky, Hoyer, Peterson, and Sakai. Physical Review C, 96 (065205). ISSN 2469-9993

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Abstract

The experimental data taken from both Drell-Yan and deep-inelastic scattering experiments suggest a sign change in ¯ d(x)−¯u(x) flavor asymmetry in the proton at large values of momentum fraction x . In this work, we present a phenomenological study of ¯d(x)−¯u(x) flavor asymmetry. First, we extract the ¯d(x)−¯u(x) distribution using the more recent data from the BONuS experiment at Jefferson Lab on the ratio of neutron to proton structure functions, Fn2/Fp2 , and show that it undergoes a sign change and becomes negative at large values of momentum fraction x, as expected. The stability and reliability of our obtained results are examined by including target mass corrections as well as higher twist terms which are particularly important in the large- x region at low Q2. Then, we calculate the ¯d(x)−¯u(x) distribution using the Brodsky-Hoyer-Peterson-Sakai model and show that if one chooses a mass for the down quark smaller than the one for the up quark it leads to a better description for the Fermilab E866 data. To prove this claim, we determine the masses of down and up sea quarks by fitting to the available and up-to-date experimental data for the ¯d(x)−¯u(x) distribution. In this respect, unlike the previous theoretical studies, we have shown that this distribution has a sign change at x>0.3 after evolution to the scale of available experimental data.

Item Type:	Article
Additional Information:	Cite as: Salajegheh, Maral & Khanpour, Hamzeh & Moosavi Nejad, Seyed Mohammad. (2017). Improved determination of d¯( x ) − u¯( x ) flavor asymmetry in the proton by data from the BONuS experiment at JLAB and using an approach by Brodsky, Hoyer, Peterson, and Sakai. Physical Review C. 96. 065205. 10.1103/PhysRevC.96.065205.
Keywords:	flavor asymmetry; proton; data; BONuS experiment; JLAB; Improved determination; (d)over-bar(x) - (u)over-bar(x);
Academic Unit:	Faculty of Science and Engineering > Theoretical Physics
Item ID:	14772
Identification Number:	https://doi.org/10.1103/PhysRevC.96.065205
Depositing User:	Hamzeh Khanpour
Date Deposited:	09 Sep 2021 15:54
Journal or Publication Title:	Physical Review C
Publisher:	American Physical Society
Refereed:	No
URI:	Publisher
Use Licence:	This item is available under a Creative Commons Attribution Non Commercial Share Alike Licence (CC BY-NC-SA). Details of this licence are available here

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