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Improved Determination of Strange Distribution Function from the Global Analysis Using BHPS Model

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Abstract

We study the impact of intrinsic strange (IS) component of nucleon sea on the global analysis of parton distribution functions (PDFs) considering a wide range of experimental data. To this aim, we consider two scenarios on the basis of BHPS model results for the IS distribution. In the first scenario, we apply the results presented through the BHPS model and in the second scenario we use its evolved distributions. For each scenarios, we present the limit of the IS probability \( \mathcal{P}_5^{s\bar{s}} \) for the standard tolerance criteria \( \Delta \chi ^2=1 \) and 18.112 at \( 1\sigma \) and \( 4\sigma \) levels. Our results show that the experimental data can tolerate an IS component with a greater probability \( \mathcal{P}_5^{s\bar{s}} \) if one employs the second scenario. We obtain \( \mathcal{P}_5^{s\bar{s}}\approx 0.01 \) and \( \mathcal{P}_5^{s\bar{s}}\approx 0.025 \) for \( \Delta \chi ^2=1 \) and 18.112, respectively, at the \( 4\sigma \) level. We also calculate the ratio of strange-to-light sea-quark densities \(r_s\) in the proton both including and excluding the IS component. Our results show that one can obtain a higher value for the ratio \(r_s\) if the IS component is included.

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Authors and Affiliations

  1. Physics Department, Yazd University, P.O.Box 89195-741, Yazd, Iran

    Maral Salajegheh & S. Mohammad Moosavi Nejad

  2. School of Particles and Accelerators, Institute for Research in Fundamental Sciences (IPM), P.O.Box 19395-5531, Tehran, Iran

    S. Mohammad Moosavi Nejad & Shahin Atashbar Tehrani

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  1. Maral Salajegheh
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Appendix: The extracted PDF Sets

Appendix: The extracted PDF Sets

For further studies on the impact of IS distributions on the physical observables, it is important to have the PDF sets including the contribution of IS component. Then, we have provided the results of our global PDF analysis in the LHAPDF6 format, including the basic analysis (where the contribution of an IS component is ignored) and the analysis of scenario II considering an IS component with the probabilities \(1\%\) and \(2.5\%\). The grid files can be obtained via email from the authors.

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Salajegheh, M., Moosavi Nejad, S.M. & Atashbar Tehrani, S. Improved Determination of Strange Distribution Function from the Global Analysis Using BHPS Model. Few-Body Syst 62, 16 (2021). https://doi.org/10.1007/s00601-021-01601-8

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