First measurement of low-pT direct photons in 13 TeV pp collisions, showing a 3.2 sigma signal in inelastic and a 1.9 sigma hint in high-multiplicity events, with yield rising with multiplicity.
CT10 parton distributions and other developments in the global QCD analysis
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abstract
We summarize several projects carried out by the CTEQ global analysis of parton distribution functions (PDFs) of the proton during 2010. We discuss a recently released CT10 family of PDFs with a fixed and variable QCD coupling strength; implementation of combined HERA and Tevatron lepton asymmetry data sets; theoretical issues associated with the analysis of $W$ charge asymmetry in PDF fits; PDFs for leading-order shower programs; and constraints on new color-octet fermions from the hadronic data.
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Direct-photon production in inelastic and high-multiplicity proton-proton collisions at $\sqrt{s} =$ 13 TeV
First measurement of low-pT direct photons in 13 TeV pp collisions, showing a 3.2 sigma signal in inelastic and a 1.9 sigma hint in high-multiplicity events, with yield rising with multiplicity.