Strange quark suppression from a simultaneous Monte Carlo analysis of parton distributions and fragmentation functions

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 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. Our study reveals significant correlations between the strange quark density and the strange $\to$ kaon fragmentation function needed to simultaneously 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.

arXiv comment6 pages, 4 figures; version to appear in Phys. Rev. D

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