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.
Inclusive Jet Production, Parton Distributions, and the Search for New Physics
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abstract
Jet production at the Tevatron probes some of the smallest distance scales currently accessible. A gluon distribution that is enhanced at large x compared to previous determinations provides a better description of the Run 1b jet data from both CDF and D0. However, considerable uncertainty still remains regarding the gluon distribution at high x. In this paper, we examine the effects of this uncertainty, and of the remaining uncertainties in the NLO QCD theory, on jet cross section comparisons to Run 1b data. We also calculate the range of contributions still possible from any new physics. Predictions are also made for the expanded kinematic range expected for the ongoing Run 2 at the Tevatron and for the LHC.
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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.