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Title Strange quark suppression from a simultaneous Monte Carlo analysis of parton distributions and fragmentation functions
Authors Nobuo Sato Gonzalez,Carlota Andres Casas,Jacob Ethier,Wolodymyr Melnitchouk
JLAB number JLAB-THY-19-2927
LANL number arXiv:1905.03788
Other number DOE/OR/23177-4690
Document Type(s) (Journal Article) 
Supported by U.S. Naval Research: No
Supported by Jefferson Lab LDRD Funding: No
Funding Source: Nuclear Physics (NP)

Compiled for Physical Review D
Volume 101
Page(s) 074020
Publication Abstract: We perform the first simultaneous extraction of unpolarized parton distributions and fragmentation functions from a Monte Carlo analysis of inclusive and semi-inclusive deep-inelastic scattering, Drell-Yan lepton-pair production, and single-inclusive $e^+ e^-$ annihilation data. We use data resampling techniques to thoroughly explore the Bayesian posterior distribution of the extracted quantum correlation functions, and use $k$-means clustering on the parameter samples to identify the configurations that give the best description across all reactions. Inclusion of the semi-inclusive data reveals a strong suppression of the strange quark distribution at parton momentum fractions $x \gtrsim 0.01$, in contrast with the ATLAS observation of enhanced strangeness in $W^\pm$ and $Z$ production at the LHC. The simultaneous analysis reveals significant correlations between the strange quark density and the strange $\to$ kaon fragmentation function needed to describe semi-inclusive $K^\pm$ production data from COMPASS and inclusive $K^\pm$ spectra in $e^+ e^-$ annihilation from ALEPH and SLD, as well as between the strange and light antiquark densities in the proton.
Experiment Numbers: other
Document: pdf
Accepted Manuscript: PhysRevD.101.074020.pdf
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