Cosmology

Nele Boelaert's Dijet Angular Distributions in Proton-Proton Collisions: At PDF

By Nele Boelaert

ISBN-10: 364224596X

ISBN-13: 9783642245961

ISBN-10: 3642245978

ISBN-13: 9783642245978

This thesis relies at the first information from the massive Hadron Collider (LHC) at CERN. Its topic might be defined because the classical Rutherford scattering scan tailored to the LHC: size of scattering angles to go looking for brand new physics and substructure. on the LHC, colliding quarks and gluons go out the proton collisions as collimated particle showers, or jets. The thesis offers reviews of the scattering angles of those jets. It features a phenomenological research on the LHC layout power of 14 TeV, the place a version of so-called huge additional dimensions is used as a benchmark procedure for the sensitivity to new physics.
The experimental result's the 1st dimension, made in 2010, via ATLAS, working on the LHC start-up power of seven TeV. the result's appropriate with the traditional version and demonstrates how good the physics and the gear are understood. the 1st info is a tiny fraction of what's going to be accrued within the coming years, and this examine has set the level for acting those measurements with self assurance because the LHC accumulates luminosity and raises its power, thereby probing smaller size scales.

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Extra info for Dijet Angular Distributions in Proton-Proton Collisions: At √s = 7 TeV and √s = 14 TeV

Sample text

They are written as a perturbation series and, at lowest order, can be interpreted as the probability of finding a parton of type b in a parton of type a with a momentum fraction z. For example, for the splitting of a gluon into a quark antiquark pair, we have at lowest order that Pg→q q¯ (z) ∝ (z 2 + (1 − z)2 ). We integrate Eq. 22) where we have considered one type of branching only. In principle z can vary between 0 and 1, but because most splitting kernels suffer from infrared singularities at z = {0, 1}, we need to introduce an explicit cut-off.

4 it was mentioned that the parton distribution function only shows logarithmic QCD scaling violations (up to leading order) and from itself does not carry a direct QCD prediction. On the other hand, the partonic cross section is a direct prediction of QCD. This means that, if we want to use Eq. 21 to study QCD, we should try to keep x1 and x2 fixed and study the remaining variation in χ . But this ideal view is not a realistic one because of statistical reasons, and therefore we need to open up the range in x1 and x2 .

9609 √ 10. 96 TeV and searches for quark compositeness and extra spatial dimensions. Phys. Rev. Lett. 103, 191803 (2009) (hep-ex/09064819) 11. D0 collaboration, B. , Measurement of Dijet Angular Distributions and Search for Quark Compositeness. Phys. Rev. Lett. 1 Extra Dimensions Even though the Standard Model is fairly complete, some phenomena cannot be explained with this theory, such as the fact that gravity appears to be much weaker than all other forces. In the 1920s, Kaluza and Klein posted the idea that the existence of extra spatial dimensions provides a mechanism to unify gravity with electromagnetism.

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Dijet Angular Distributions in Proton-Proton Collisions: At √s = 7 TeV and √s = 14 TeV by Nele Boelaert


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