Oh, thanks!Vanadium 50 said:Peterson is the old standy. Matteo Cacciari has done work on more modern ones.
RGevo said:By ff do you mean flux?
CTEQ (Coordinated Theoretical-Experimental Project on QCD Phenomenology) is a global collaboration of scientists that work on the development and improvement of Parton Distribution Functions (PDFs) for use in high-energy particle physics experiments. PDFs are mathematical functions that describe the probability of finding a quark or gluon with a certain momentum inside a proton or other hadron.
Yes, there are several other groups that work on PDFs for FF's such as NNPDF (NNPDF Collaboration), MMHT (The MMHT Collaboration), and HERAPDF (HERA PDF Working Group). Each group has its own approach and methodology for determining PDFs, and they often collaborate and share their results with each other.
These groups use a combination of experimental data and theoretical calculations to determine the PDFs for FF's. The experimental data comes from various particle colliders and other high-energy experiments, while the theoretical calculations are based on Quantum Chromodynamics (QCD), the theory that describes the interactions of quarks and gluons.
PDFs for FF's are crucial for understanding and making predictions about high-energy particle collisions. They are also used in the analysis of data from particle colliders, which can provide insights into the fundamental nature of matter and the universe. Additionally, PDFs for FF's are important for improving our understanding of QCD and its role in the Standard Model of particle physics.
These groups update their PDFs for FF's regularly, typically once a year or every few years. This is necessary because new experimental data becomes available, and improvements in theoretical calculations are made. These updates ensure that the PDFs are as accurate as possible and can provide the most precise predictions for high-energy particle collisions.