Soft Gluon Effects on Electroweak Boson Production in Hadron Collisions PDF Download
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Author: Csaba Balázs
Publisher:
ISBN:
Category : Electroweak interactions
Languages : en
Pages : 550
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Book Description
Author: Csaba Balázs
Publisher:
ISBN:
Category : Electroweak interactions
Languages : en
Pages : 550
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Author: Timo Schmidt
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Jian Wang
Publisher: Springer
ISBN: 3662486733
Category : Science
Languages : en
Pages : 153
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Book Description
This book mainly investigates the precision predictions on the signal of new physics at the Large Hadron Collider (LHC) in the perturbative Quantum Chromodynamics (QCD) scheme. The potential of the LHC to discover the signal of dark matter associated production with a photon is studied after including next-to-leading order QCD corrections. The factorization and resummation of t-channel top quark transverse momentum distribution in the standard model at both the Tevatron and the LHC with soft-collinear effective theory are presented. The potential of the early LHC to discover the signal of monotops is discussed. These examples illustrate the method of searching for new physics beyond what is known today with high precision.
Author: Diogenes Alberto Figueroa
Publisher:
ISBN:
Category : Particles (Nuclear physics)
Languages : en
Pages : 0
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Book Description
Processes involving the production of electroweak gauge bosons($W, Z, \gamma$) or a Higgs boson with $b$ jets play a very important role in stress testing the Standard Model and constitute major backgrounds in most searches of new physics beyond the Standard Model at present and future colliders. Given the unprecedented experimental precision that will be reached bythe Large Hadron Collider (LHC) experiments during the upcoming Run 3 and the high-luminosity upgrade (HL-LHC), improving the accuracy of theoretical predictions to reach the few-percent level becomes crucial to the success of their physics program. Besides accounting for QCD quantum corrections, this implies including electroweak quantum effects, $b$-quark mass effects, and effects due to the off-shellness of the final-state boson decaying into leptons or quarks, as well as revisiting approximations that enters in the evolution of a high-energy collision into final-state jets of hadrons. In this thesis we develop a general formalism (massive dipoles and massive 5 flavor scheme) to systematically account for $b$-quark mass effects at all stages, from the $b$-quark parton densities in the initial-state protons to the matching of $b$ quarks from the hard scattering to the final-state hadrons via parton shower. Formal results form this thesis have been implemented in the\texttt{Madisqe} framework to allow the general calculation of Standard Model cross sections including the first order of QCD and electroweak corrections and accounting for full $b$-quark mass effects. Furthermore, they have been used to improve the efficiency and numerical stability of \texttt{NLOX}, a public domain framework for the automated calculation of one-loop Standard Model scattering amplitudes. As a particularly interesting study case, we present in this thesisthe case of $Z+b$ jets. The production of a $Z$ boson with bottom quarks can probe both the fundamental properties of $b$ quarks as constituents of hadrons and hadron jets, and represents one of the major backgrounds to precision measurements of Higgs-boson couplings in $ZH (H\rightarrow b\bar{b}$) associated production as well as in many searches of new physics. In this thesis, we study in particulat the impact of EW corrections and $b$-quark mass effects on total and differential rates for $Z+b$ jets at the LHC.
Author: Anna Katarzyna Kulesza
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: A. V. Ling
Publisher: Nova Publishers
ISBN: 9781594545207
Category : Science
Languages : en
Pages : 384
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Book Description
Bosons are particles which form totally-symmetric composite quantum states. As a result, they obey Bose-Einstein statistics. The spin-statistics theorem states that bosons have integer spin. Bosons are also the only particles which can occupy the same state as another. All elementary particles are either bosons or fermions. Gauge bosons are elementary particles which act as the carriers of the fundamental forces such as the W vector bosons of the weak force, the gluons of the strong force, the photons of the electromagnetic force, and the graviton of the gravitational force. Particles composed of a number of other particles (such as protons or nuclei) can be either fermions or bosons, depending on their total spin. Hence, many nuclei are in fact bosons. While fermions obey the Pauli exclusion principle: "no more than one fermion can occupy a single quantum state", there is no exclusion property for bosons, which are free to (and indeed, other things being equal, tend to) crowd into the same quantum state. This explains the spectrum of black-body radiation and the operation of lasers, the properties of superfluid helium-4 and the possibility of bosons to form Bose-Einstein condensates, a particular state of matter. It is important to note that, Bose-Einstein condensation occurs only at ultra-low temperature. There is nothing exotic about bosons otherwise. At any reasonable temperatures, both the boson and fermion particles behave as classical particles, i.e. particle in a box, and follow the Maxwell-Boltzmann Statistics. This book includes leading research from around the world.
Author: Aleandro Nisati
Publisher: World Scientific
ISBN: 981442546X
Category : Science
Languages : en
Pages : 470
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Book Description
The recent observation of the Higgs boson has been hailed as the scientific discovery of the century and led to the 2013 Nobel Prize in physics. This book describes the detailed science behind the decades-long search for this elusive particle at the Large Electron Positron Collider at CERN and at the Tevatron at Fermilab and its subsequent discovery and characterization at the Large Hadron Collider at CERN. Written by physicists who played leading roles in this epic search and discovery, this book is an authoritative and pedagogical exposition of the portrait of the Higgs boson that has emerged from a large number of experimental measurements. As the first of its kind, this book should be of interest to graduate students and researchers in particle physics.
Author: Yuta Okazaki
Publisher: Springer Nature
ISBN: 9811965935
Category : Science
Languages : en
Pages : 230
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Book Description
Supersymmetry (SUSY) introduces superpartners of the Standard Model (SM) particles. If their masses are typically O(100 GeV) ∼ O(TeV), a lightest neutralino can be a candidate for the dark matter, and the problem is solved by canceling the correction of the Higgs boson mass. Further, SUSY can explain the experimental result of the muon magnetic moment (g-2). This book presents a search for electroweakinos—the superpartners of the SM electroweak bosons—such as charginos and neutralinos using data at the LHC collected by the ATLAS detector. Pair-produced electroweakinos decay into the light ones and SM bosons (W/Z/h), and with the large mass difference between the heavy and light electroweakinos, the SM bosons have high momenta. In a fully hadronic final state, quarks decayed from the bosons are collimated, and can consequently be reconstructed as a single large-radius jet. This search has three advantages. The first is a statistical benefit by large branching ratios of the SM bosons. The second is to use characteristic signatures—the mass and substructure—of jets to identify as the SM bosons. The last is a small dependency on the signal model by targeting all the SM bosons. Thanks to them, the sensitivity is significantly improved compared to the previous analyses. Exclusion limits at the 95% confidence level on the heavy electroweakino mass parameter are set as a function of the light electroweakino mass parameter. They are set on wino or higgsino production models with various assumptions, such as the branching ratio of their decaying and the type of lightest SUSY particle. These limits are the most stringent limits. Besides, this book provides the most stringent constraints on SUSY scenarios motivated by the dark matter, the muon g-2 anomaly, and the naturalness.
Author:
Publisher:
ISBN:
Category : Dissertations, Academic
Languages : en
Pages : 856
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Author: Arnulf Quadt
Publisher: Springer Science & Business Media
ISBN: 3540710604
Category : Science
Languages : en
Pages : 166
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Book Description
This will be a required acquisition text for academic libraries. More than ten years after its discovery, still relatively little is known about the top quark, the heaviest known elementary particle. This extensive survey summarizes and reviews top-quark physics based on the precision measurements at the Fermilab Tevatron Collider, as well as examining in detail the sensitivity of these experiments to new physics. Finally, the author provides an overview of top quark physics at the Large Hadron Collider.
