Measurement of the Production Cross Section for Pairs of Isolated Photons in Pp Collisions at Sqrt(s)

Measurement of the Production Cross Section for Pairs of Isolated Photons in Pp Collisions at Sqrt(s)

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Publisher:

Published: 2012

Total Pages: 38

ISBN-13:

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The integrated and differential cross sections for the production of pairs of isolated photons is measured in proton-proton collisions at a centre-of-mass energy of 7 TeV with the CMS detector at the LHC. A data sample corresponding to an integrated luminosity of 36 inverse picobarns is analysed. A next-to-leading-order perturbative QCD calculation is compared to the measurements. A discrepancy is observed for regions of the phase space where the two photons have an azimuthal angle difference, $\Delta(\phi)$, less than approximately 2.8.


Measurement of Differential Cross Sections for the Production of a Pair of Isolated Photons in Pp Collisions at $$\sqrt{s}

Measurement of Differential Cross Sections for the Production of a Pair of Isolated Photons in Pp Collisions at $$\sqrt{s}

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Publisher:

Published: 2014

Total Pages: 3170

ISBN-13:

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A measurement of differential cross sections for the production of a pair of isolated photons in proton-proton collisions at $\sqrt{s}=7\, \text {TeV} $ is presented. The data sample corresponds to an integrated luminosity of 5.0 $\, \text {fb}^{-1}$ collected with the CMS detector. A data-driven isolation template method is used to extract the prompt diphoton yield. The measured cross section for two isolated photons, with transverse energy above 40 and 25 $\, \text {GeV}$ respectively, in the pseudorapidity range $


The Black Book of Quantum Chromodynamics — A Primer for the LHC Era

The Black Book of Quantum Chromodynamics — A Primer for the LHC Era

Author: John Campbell

Publisher: Oxford University Press

Published: 2018-01-19

Total Pages: 761

ISBN-13: 0191014990

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The Black Book of Quantum Chromodynamics is an in-depth introduction to the particle physics of current and future experiments at particle accelerators. The book offers the reader an overview of practically all aspects of the strong interaction necessary to understand and appreciate modern particle phenomenology at the energy frontier. It assumes a working knowledge of quantum field theory at the level of introductory textbooks used for advanced undergraduate or in standard postgraduate lectures. The book expands this knowledge with an intuitive understanding of relevant physical concepts, an introduction to modern techniques, and their application to the phenomenology of the strong interaction at the highest energies. Aimed at graduate students and researchers, it also serves as a comprehensive reference for LHC experimenters and theorists. This book offers an exhaustive presentation of the technologies developed and used by practitioners in the field of fixed-order perturbation theory and an overview of results relevant for the ongoing research programme at the LHC. It includes an in-depth description of various analytic resummation techniques, which form the basis for our understanding of the QCD radiation pattern and how strong production processes manifest themselves in data, and a concise discussion of numerical resummation through parton showers, which form the basis of event generators for the simulation of LHC physics, and their matching and merging with fixed-order matrix elements. It also gives a detailed presentation of the physics behind the parton distribution functions, which are a necessary ingredient for every calculation relevant for physics at hadron colliders such as the LHC, and an introduction to non-perturbative aspects of the strong interaction, including inclusive observables such as total and elastic cross sections, and non-trivial effects such as multiple parton interactions and hadronization. The book concludes with a useful overview contextualising data from previous experiments such as the Tevatron and the Run I of the LHC which have shaped our understanding of QCD at hadron colliders.


Measurement of the Inclusive-Isolated Prompt-Photon Cross Section in $p\bar{p}$ Collisions Using the Full CDF Data Set

Measurement of the Inclusive-Isolated Prompt-Photon Cross Section in $p\bar{p}$ Collisions Using the Full CDF Data Set

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Publisher:

Published: 2017

Total Pages:

ISBN-13:

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A measurement of the inclusive production cross section of isolated prompt photons in proton-antiproton collisions at center-of-mass energy $\sqrt{s}$=1.96TeV is presented. The results are obtained using the full Run II data sample collected with the Collider Detector at the Fermilab Tevatron, which corresponds to an integrated luminosity of 9.5fb$^{-1}$. The cross section is measured as a function of photon transverse energy, $E_T^{\gamma}$, in the range 30$


First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at $\sqrt{s}

First Measurement of the Cross Section for Top-Quark Pair Production in Proton-Proton Collisions at $\sqrt{s}

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Publisher:

Published: 2011

Total Pages: 26

ISBN-13:

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The first measurement of the cross section for top-quark pair production in pp collisions at the LHC at center-of-mass energy sqrt(s)= 7 TeV has been performed using 3.1 {\pm} 0.3 inverse pb of data recorded by the CMS detector. This result utilizes the final state with two isolated, highly energetic charged leptons, large missing transverse energy, and two or more jets. Backgrounds from Drell-Yan and non-W/Z boson production are estimated from data. Eleven events are observed in the data with 2.1 {\pm} 1.0 events expected from background. The measured cross section is 194 {\pm} 72 (stat.) {\pm} 24 (syst.) {\pm} 21 (lumi.) pb, consistent with next-to-leading order predictions.