Abstract
Single haron multiplicities in Semi-Inclusive Deep Inelastic Scattering (SIDIS) provide an important input for the understanding of the hadronisation process and its description in terms of Fragmentation Functions (FFs). COMPASS collaboration has undertaken a programme of measurements of these observables. I first give an overview of the results obtained in the range 0.20 < z < 0.85 for the fraction z of the virtual photon energy carried by the hadron. And I then focus on the multiplicity charge ratio, h−/h+, at large z, which results challenge the conventional picture of a factorisation between FFs and Parton Distribution Functions (PDFs).
Highlights
Quark and gluon fragmentation into hadrons is a core ingredient of a QCD-based analysis of hard scattering
The perturbative QCD (pQCD) framework whereby Semi-Inclusive Deep Inelastic Scattering (SIDIS) cross-section factorises into a hard scattering, Parton Distribution Functions (PDFs) and
To serve as a guidance, we show a lower limit obtained using LO pQCD, isospin symmetry and reasonable assumptions on the PDFs, viz.: u + d
Summary
Quark and gluon fragmentation into hadrons is a core ingredient of a QCD-based analysis of hard scattering. In the framework of perturbative QCD (pQCD) with independent fragmentation, the fragmentation process is universal, i.e. the hadronisation of a parton does not depend on how it was produced. It is described by non-perturbative objects called Fragmentation Functions. Its spectrometer is designed to reconstruct scattered muons and charged hadrons in a wide kinematic range It is equipped with a RICH for particle identification. The corresponding data were obtained with a 160 GeV μ+ beam impinging on a 6LiD target
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