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Transverse Momentum of Charged Particles at low Q^2 at HERA |
| Reference |
Preliminary DIS2010, April 2010
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| Figures |
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| Abstract | The electron-proton collider HERA allows deep-inelastic scattering (DIS) at
very small Bjorken-x of about 10^-5. At such small x new parton dynamics
beyond DGLAP are expected to become important. Charged particle spectra are
measured in DIS (Q^2 > 5 GeV^2), in different regions of pseudorapidity,
using the increased statistics of HERA-2. The measurements are compared to
simulations based on different Monte Carlo generators. It is shown that the
region of small transverse momenta is primarily sensitive to hadronisation,
whereas the region of large transverse momenta is mainly driven by
perturbative parton radiation. The observed hardness of the transverse
momentum spectra, when compared to different model predictions, can be
interpreted as supporting the idea of parton dynamics beyond DGLAP. |
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