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We compare with NNLO theory predictions and use a least-squares method to extract the values of the parameters simultaneously.
In theoretical physics, quantum chromodynamics (QCD) is the theory of the strong interaction between quarks and gluons, the fundamental particles that make. Quantum chromodynamics (QCD), in physics, the theory that describes the action of the strong force. QCD was constructed in analogy to quantum.
We find best fit values of the parameters which are compatible with previous extractions performed using top data with the current world averages published by the Particle Data Group. We consider the issue of PDF choice and the circumstances in which a heavy quark can be considered a constituent of the proton.
In particular, we look at the production of a Higgs boson in association with bottom quarks in four and five flavour schemes, in which the b may or may not be included in the initial state. We show that theoretical predictions in both schemes are well-motivated and appropriate in different scenarios, and moreover that results in the schemes are consistent provided a judicious choice of the renormalisation and factorisation scales is made.
We suggest a typical scale choice motivated by considerations of consistency and find it to be somewhat lower than the typical hard scale of the process. Rights Attribution 4. Recommended or similar items.
Except where otherwise noted, this item's licence is described as Attribution 4. In addition to standard quantum mechanical properties charge, mass, and spin , quarks have another property, which came out of the theory, called color charge. It comes in three varieties, named red, green, and blue.
Because QED describes the quantum theory of the electrical charge, QCD describes the quantum theory of the color charge. In addition to the quarks, there exist particles called gluons. The gluons bind the quarks together, kind of like rubber bands in a very metaphoric sense.
This free course is available to start right now. D95 no. Rapidity gaps and ancestry - Le Anh, Dung et al. Collins, J. DOI: Sivers function in the quasiclassical approximation - Kovchegov, Yuri V.
These gluons are the gauge bosons for the strong nuclear force, just as the photons are the gauge bosons for electromagnetism. String Theory and Quantum Chromodynamics.
Key Events in String Theory History Although string theory is a young science, it has had many notable achievements. What foll String Theory Features String theory is a work in progress, so trying to pin down exactly what the science is, or How to Calculate Acceleration In physics terms, acceleration, a, is the amount by which your velocity changes in a given Important Physics Equations to Remember Physics is packed with formulas and equations.
This comprehensive list, arranged by topic, Advisors Mitov, Alexander. Date Awarding Institution University of Cambridge. Author Affiliation Department of Physics. Qualification Doctor of Philosophy PhD.
Language English. Metadata Show full item record. Citation Lim, M. The current progress in precision measurement of Standard Model processes at the LHC experiments must be matched with corresponding precision in theoretical predictions, and to this end we present calculations at next-to-next-to-leading order in perturbation theory of observable quantities involving quarks and gluons, the strongly interacting particles of the SM.