Isolated Prompt Photon Production at Collider Energies PDF Download
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Author:
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Languages : en
Pages : 5
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Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
Get Book Here
Book Description
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 5
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Book Description
We provide a consistent treatment of the isolated prompt photon cross section in QCD perturbation theory, showing that well behaved predictions can be derived for a wide range of isolation parameters. 6 refs.
Author: Michael Hance
Publisher: Springer Science & Business Media
ISBN: 3642330622
Category : Science
Languages : en
Pages : 152
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Book Description
This thesis reports on the first studies of Standard Model photon production at the Large Hadron Collider (LHC) using the ATLAS detector. Standard Model photon production is a large background in the search for Higgs bosons decaying into photon pairs, and is thus critical to understand. The thesis explains the techniques used to reconstruct and identify photon candidates using the ATLAS detector, and describes a measurement of the production cross section for isolated prompt photons. The thesis also describes a search for the Higgs boson in which the analysis techniques used in the measurement are exploited to reduce and estimate non-prompt backgrounds in diphoton events.
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Category :
Languages : en
Pages : 142
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Book Description
In this thesis we present the measurement of the inclusive isolated prompt photon cross section with a total integrated luminosity of 2.5 fb−1 of data collected with the CDF Run II detector at the Fermilab Tevatron Collider. The prompt photon cross section is a classic measurement to test perturbative QCD (pQCD) with potential to provide information on the parton distribution function (PDF), and sensitive to the presence of new physics at large photon transverse momentum. Prompt photons also constitute an irreducible background for important searches such as H → [gamma][gamma], or SUSY and extra-dimensions with energetic photons in the final state. The Tevatron at Fermilab (Batavia, U.S.A.) is currently the hadron collider that operates at the highest energies in the world. It collides protons and antiprotons with a center-of-mass energy of 1.96 TeV. The CDF and the D0 experiments are located in two of its four interaction regions. In Run I at the Tevatron, the direct photon production cross section was measured by both CDF and DO, and first results in Run II have been presented by the DO Collaboration based on 380 pb−1. Both Run I and Run II results show agreement with the theoretical predictions except for the low p{sub T}{sup {gamma}} region, where the observed and predicted shapes are different. Prompt photon production has been also extensively measured at fixed-target experiments in lower p{sub T}{sup {gamma}} ranges, showing excess of data compared to the theory, particularly at high x{sub T}. From an experimental point of view, the study of the direct photon production has several advantages compared to QCD studies using jets. Electromagnetic calorimeters have better energy resolution than hadronic calorimeters, and the systematic uncertainty on the photon absolute energy scale is smaller. Furthermore, the determination of the photon kinematics does not require the use of jet algorithms. However, the measurements using photons require a good understanding of the background, mainly dominated by light mesons ([pi]° and [eta]) which decay into two very collinear photons. Since these photons are produced within a jet, they tend to be non-isolated in most of the cases, and can be suppressed by requiring the photon candidates to be isolated in the calorimeter. In the case the hard scattered parton hadronizes leaving most of its energy to the meson, the photon produced in the decay will not be surrounded by large energy depositions. To further reduce this remaining isolated background, we present a new technique based on the isolation distribution in the calorimeter. The measured cross section is compared to next-to-leading order (NLO) pQCD calculations, which have been corrected for non-perturbative contributions. This thesis is organized as follows: we start with a brief review of QCD theory and the formalism to calculate cross sections in Chapter 2, where we also introduce the physics of prompt photon production and summarize the current status of the prompt photon phenomenology. Chapter 3 contains a description of the Tevatron and the CDF detector. The experimental measurement is described in Chapter 4, where we provide details on the different datasets used in the measurement, the trigger, and the event selection requirements. Most of this Chapter is devoted to the explanation of the background subtraction method and the determination of the photon signal fraction. The systematic uncertainties on the measurement are evaluated in Chapter 5, while Chapter 6 discusses the final results and the comparison to the theoretical predictions. Finally, the conclusions are presented in Chapter 7.
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Category :
Languages : en
Pages :
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Book Description
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$
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Category :
Languages : en
Pages :
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Book Description
The measurement of the cross section for the inclusive production of isolated prompt photons in proton-antiproton collisions at $\sqrt{s}$=1.96~TeV is presented. The data set corresponds to an integrated luminosity of 9.5~fb$^{-1}$, collected with the Collider Detector at Fermilab in Run~II. The measurement is performed as a function of the photon transverse energy ($E_T^{\gamma}$) covering the range of 30~GeV$
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 6
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Book Description
We present measurements of inclusive isolated prompt photon production in p{bar p} collisions at a center-of-mass energy of 1.8 TeV from the Fermilab experiments CDF and D0. Precision measurements of prompt photon production fro CD constrain the gluon distribution, and recent results from D0 agree with CDF and QCD predictions. We also present studies of events with up to six jets in the final state from the CDF experiment. The mass distributions and mass ratio for these events is well described by the HERWIG parton shower Monte Carlo and by leading order QCD. Finally we present studies by both CDF and D0 of events with three jets in the final state.
Author: Robert Keyes
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Book Description
"This thesis presents the measurement of the production cross section of high energy isolated prompt photons in association with charm flavour jets in 20.1/fb of proton-proton collisions at a center of mass energy of 8 TeV using the ATLAS detector. Isolated prompt photons are well described theoretically and well measured experimentally, providing unique advantages when probing parton level dynamics and the content of the proton. As such, measurements of this type can be used in global parton distribution fits to better constrain the charm quark content of the proton in the Large Hadron Collider (LHC) environment. The differential cross sections are measured with respect to the photon transverse energy, ET[gamma], in two photon pseudorapidity regions: |[eta][gamma]|
Author:
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Category :
Languages : en
Pages :
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Book Description
A measurement of the cross section for the inclusive production of isolated photons by the CDF experiment at the Fermilab Tevatron collider is presented. The measurement covers the pseudorapidity region.
Author:
Publisher:
ISBN:
Category :
Languages : en
Pages : 9
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Book Description
We show that the conventionally defined partonic cross section for the production of isolated prompt photons is not an infrared safe quantity. We work out the case of ee− 2![gamma] + X in detail, and we discuss implications for hadron reactions such as p{bar p} 2![gamma] + X.
