Abstract
We present recent results on Minimum Bias, MPI and DPS, Diffractive and Exclusive studies using data collected during Run 1 of the LHC. The measurements include data collected in pp collisions at s=7, and 8 TeV by the CMS Collaboration. Double parton scattering is investigated in several final states including vector bosons and jets, and the effective cross section results are compared to other experiments and to MPI models tuned to recent underlying event measurements at CMS. Inclusive diffractive cross sections are discussed and compared to models, while searches and measurements of central exclusive processes are presented. The results from the first combined measurement by the CMS+TOTEM collaborations of the pseudorapidity distribution of charged particles at 8 TeV are also discussed, and are compared to models and to lower energy measurements.
Highlights
Forward, diffractive and exclusive physics cover a wide range of subjects, including low-x QCD, underlying event and multiple interactions characteristics, and central exclusive process
Double parton scattering is investigated in several final states including vector bosons and jets, and the effective cross section results are compared to other experiments and to multi-parton interactions (MPI) models tuned to recent underlying event measurements at Compact Muon Solenoid (CMS)
Diffractive and exclusive physics cover a wide range of subjects, including low-x QCD, underlying event and multiple interactions characteristics, and central exclusive process
Summary
Diffractive and exclusive physics cover a wide range of subjects, including low-x QCD, underlying event and multiple interactions characteristics, and central exclusive process. With excellent performance the Compact Muon Solenoid (CMS) experiment [1] has made a number of significant observations in diffractive and exclusive processes and to probe the Standard model in a unique way. The particle production in pp collisions at LHC, will allow to test the fundamental aspect of QCD, namely the interplay between soft and hard contributions to an interaction. Its good understanding is crucial for the proper modeling of the final state of Minimum-Bias events, and can help improve the simulation of e.g. the underlying event, pile-up events, and the measurement of the machine luminosity at the LHC. We present the recent CMS results on diffraction, forward physics and soft QCD, and discuss their comparison to pre-.
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