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Exploring 2D Hadron Attenuation: Insights for Hadronization Theory

This paper by Z. Akopov presents a study on the 2D attenuation of hadrons using data from Neon, Krypton, and Xenon targets. The analysis focuses on various kinematic ranges and charged hadrons individually. The results reveal significant differences in behavior for different hadron species, highlighting the need for updated theoretical models in hadronization. The study raises questions on the predictability of 2D dependencies based on 1D data and emphasizes the importance of incorporating these new findings into theoretical frameworks. The research findings offer valuable insights into hadron production mechanisms and call for a new approach to understanding hadronization processes.

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Exploring 2D Hadron Attenuation: Insights for Hadronization Theory

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  1. Status of 2D hadron attenuation paper Z. Akopov for DC_73

  2. Motivation/Results In addition to Long paper, performed 2D analysis for Neon, Krypton and Xenon for all charged hadrons separately: • Nu, Q2, pt2 and Lc in 3 z-ranges • Z,Q2,pt2 and Lc in 3 nu-ranges • Nu,z,Q2 and Lc in 2 pt2-ranges • 1D Lc dependence

  3. Results overview • Normally attenuation goes to 1; for proton in heavier targets – different behavior – slope changes. • Should be reflected/accounted for in model calculations

  4. Results overview • Tendency seen for pions, remains for K,p • At leading z, little to no broadening

  5. Results overview • Nu-dependency • As opposed to pions, amplification at high pt2 on heavier targets • Rescattering, more protons. • Models have to explain

  6. Results overview • When divide in z-ranges, no more scaling for proton! • Slopes different

  7. Results overview • Anti-protons – similar to pions and co.

  8. Results overview • Different hN x-section for K+/K- and p/anti-p, well reflected • Otherwise, for each charge scaling remains.

  9. Questions imposed to paper • Are we able to explain the features of 2d-dependencies just based on published 1d data? • What can be achieved using the 2d-data for all charged hadrons and how useful is that for theory?

  10. Arguments • Clear difference between super-ratio for positive/negative hadrons, i.e. kaons and protons • Lc dependence data for various kinematic ranges, gives solid experimental proof of different production mechanisms of proton as opposed to other hadrons • Important: such behavior is not possible to predict based on the published data: interpretation of these new data should motivate new approaches to theoretical threatment of hadronization

  11. Conclusion • HERMES possesses new set of results that are clearly needed on the market. • Either separate paper to present these results, or an addendum to the Long NA paper.

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