SMuK 2021 – scientific programme

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HK: Fachverband Physik der Hadronen und Kerne

HK 26: Invited Talks - V

HK 26.2: Invited Talk

Friday, September 3, 2021, 11:30–12:00, H1

Double parton scattering and double parton distributions — •Peter Plößl — Deutsches Elektronen-Synchrotron DESY, Hamburg, Germany

Double parton scattering (DPS) describes the situation when two individual hard scattering reactions occur in a single hadron-hadron collision. In some regions of phase space DPS may give sizeable contributions to the production of multi-particle final states and thus constitutes an important background to single parton scattering (SPS) in channels suitable for the search for physics beyond the standard model. Besides this DPS is also an interesting phenomena in its own right, as it gives insight into the correlations of partons inside of hadrons.

A theoretical description of DPS processes from first principles can be achieved by deriving factorisation theorems akin to the ones known from SPS, with a central building block being the double parton distributions (DPDs). However, these DPDs are presently basically unknown as experimental data is still lacking.

As a consequence one has to rely on physically motivated models for DPDs to be able to calculate DPS contributions to a given process. One important constraint for such models is given by number and momentum sum rules for DPDs in close analogy to the well known PDF sum rules. Another constraint can be obtained by observing that in the limit of small distances between the two partons DPDs can in fact be matched onto regular PDFs with perturbative matching kernels.