H To Gamma Gamma Search And Direct Photon Pair Production Differential Cross Section

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H To Gamma Gamma Search And Direct Photon Pair Production Differential Cross Section

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Author :
language : en
Publisher:
Release Date : 2010

H To Gamma Gamma Search And Direct Photon Pair Production Differential Cross Section written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2010 with categories.

At a hadron collider, diphoton ([gamma][gamma]) production allows detailed studies of the Standard Model (SM), as well as as searches for new phenomena, such as new heavy resonances, extra spatial dimensions or cascade decays of heavy new particles. Within the SM, continuum [gamma][gamma]+X production is characterized by a steeply-falling [gamma][gamma] mass spectrum, on top of which a heavy resonance decaying into [gamma][gamma] can potentially be observed. In particular, this is considered one of the most promising discovery channels for a SM Higgs boson at the LHC, despite the small branching ratio of BR (H 2![gamma][gamma]) H"0.2% for 110 M{sub Higgs} 140 GeV. At the Tevatron, the dominant SM Higgs boson production mechanism is gluon fusion, followed by associated production with a W or Z boson, and vector boson fusion. While the SM Higgs production rate at the Tevatron is not sufficient to observe it in the [gamma][gamma] mode, the Hgg and H[gamma][gamma] couplings, being loop-mediated, are particularly sensitive to new physics effects. Furthermore, in some models beyond the SM, for instance, fermiophobic Higgs, with no couplings to fermions, the BR (H 2![gamma][gamma]) can be enhanced significantly relative to the SM prediction, while has the SM-like production cross sections except the gluon fusion is absent. In this thesis, we present a search for a light Higgs boson in the diphoton final state using 4.2 ± 0.3 fb−1 of the D0 Run II data, collected at the Fermilab Tevatron collider from April 2002 to December 2008. Good agreement between the data and the SM background prediction is observed. Since there is no evidence for new physics, we set 95% C.L. limits on the production cross section times the branching ratio ([sigma] x BR(H 2![gamma][gamma])) relative to the SM-like Higgs prediction for different assumed Higgs masses. The observed limits ([sigma](limit)/[sigma](SM)) range from 11.9 to 35.2 for Higgs masses from 100 to 150 GeV, while the expected limits range from 17.5 to 32.0. This search is also interpreted in the context of the particular fermiophobic Higgs model. The corresponding results have reached the same sensitivity as a single LEP experiement, setting a lower limit on the fermiophobic Higgs of M{sub h{sub f}} 102.5 GeV (M{sub h{sub f}} 107.5 GeV expected). We are slightly below the combined LEP limit (M{sub h{sub f}}> 109.7 GeV). We also provide access to the M{sub h{sub f}}> 125 GeV region which was inaccessible at LEP. During the study, we found the major and irreducible background direct [gamma][gamma] (DPP) production is not well modelled by the current theoretical predictions: RESBOS, DIPHOX or PYTHIA. There is H"0% theoretical uncertainty for the predicted values. Thus, for our Higgs search, we use the side-band fitting method to estimate DPP contribution directly from the data events. Furthermore, DPP production is also a significant background in searches for new phenomena, such as new heavy resonances, extra spatial dimensions, or cascade decays of heavy new particles. Thus, precise measurements of the DPP cross sections for various kinematic variables and their theoretical understanding are extremely important for future Higgs and new phenomena searches. In this thesis, we also present a precise measurement of the DPP single differential cross sections as a function of the diphoton mass, the transverse momentum of the diphoton system, the azimuthal angle between the photons, and the polar scattering angle of the photons, as well as the double differential cross sections considering the last three kinematic variables in three diphoton mass bins, using 4.2 fb−1 data. These results are the first of their kind at D0 Run II, and in fact the double differential measurements are the first of their kind at Tevatron. The results are compared with different perturbative QCD predictions and event generators.

Nuclear Science Abstracts

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language : en
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Release Date : 1974

Nuclear Science Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1974 with Nuclear energy categories.

High Energy Physics Index

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language : en
Publisher:
Release Date : 1993

High Energy Physics Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1993 with Particles (Nuclear physics) categories.

Scientific And Technical Aerospace Reports

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language : en
Publisher:
Release Date : 1995

Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.

Energy Research Abstracts

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Author :
language : en
Publisher:
Release Date : 1994-11

Energy Research Abstracts written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994-11 with Power resources categories.

Current Experiments In Elementary Particle Physics

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language : en
Publisher:
Release Date : 1985

Current Experiments In Elementary Particle Physics written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with Particles (Nuclear physics) categories.

Physics Briefs

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language : en
Publisher:
Release Date : 1989-07

Physics Briefs written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1989-07 with Physics categories.

Fermilab Research Program Workbook

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Author :
language : en
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Release Date : 1986

Fermilab Research Program Workbook written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1986 with Particle accelerators categories.

From The Fermi Scale To Cosmology

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Author : Alberto Salvio
language : en
Publisher: Frontiers Media SA
Release Date : 2019-12-06

From The Fermi Scale To Cosmology written by Alberto Salvio and has been published by Frontiers Media SA this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019-12-06 with categories.

Publications Of The National Institute Of Standards And Technology Catalog

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Author : National Institute of Standards and Technology (U.S.)
language : en
Publisher:
Release Date : 1985

Publications Of The National Institute Of Standards And Technology Catalog written by National Institute of Standards and Technology (U.S.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1985 with categories.