Transverse-momentum-ordered showers and interleaved multiple interactions

Abstract

We propose a sophisticated framework for high-energy hadronic collisions,\nwherein different QCD physics processes are interleaved in a common sequence of\nfalling transverse-momentum values. Thereby phase-space competition is\nintroduced between multiple parton-parton interactions and initial-state\nradiation. As a first step we develop new transverse-momentum-ordered showers\nfor initial- and final-state radiation, which should be of use also beyond the\nscope of the current article. These showers are then applied in the context of\nmultiple interactions, and a few tests of the new model are presented. The\narticle concludes with an outlook on further aspects, such as the possibility\nof a shower branching giving partons participating in two different\ninteractions.\n