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The mechanisms leading to the hadronic final state of high-energyproton-proton collisions remain an unresolved issue at the RHIC and LHC. Asubstantial contribution to the hadronic final state from minimum-bias (MB)jets is dominated by non-perturbative processes and may provide the common basefor any high-energy dijet. Observation of a same-side (on azimuth)"ridge" inLHC p-p collisions suggests to some that hydrodynamic flows may play a role inthat small system at higher energies. The issue of p-p centrality vs triggeredjets has emerged in the context of gluon transverse distributions in the protoninferred from DIS data. Attempts have been made to isolate and study theunderlying event (UE) complementary to triggered dijets, and it is suggestedthat multiple parton interactions may contribute to the UE.  Reference [1] considered theoretical and experimental results for UEsystematics and p-p centrality in the context of a two-component (soft+hard)model derived from single-particle $p_t$ spectrum $n_{ch}$ systematics. Thestudy concluded that there may be a substantial contribution to the UE from thetriggered dijet and that p-p centrality is not controlled significantly by ajet trigger condition (if p-p centrality is relevant at all). Further study oftwo-particle correlations in p-p collisions was called for, particularly the$n_{ch}$ dependence of MB correlations.  We report a comprehensive study of MB (no $p_t$ cuts) angular correlationsand trigger-associated (TA) $y_t$ correlations (transverse rapidity $y_t =\ln[(m_t + p_t)/m_\pi])$ from 200 GeV p-p collisions. Angular correlations arecharacterized by 2D model fits that accurately distinguish among protondissociation structure (soft), jet-related structure (hard) and a nonjetazimuth quadrupole. All angular correlations are simply represented by a(2+1)-component model...

Minimum-bias angular and trigger-associated correlations from 200 GeV p-p collisions: jets, flows, centrality and the underlying event