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Combined Cdf And D0 Upper Limits On Standard Model Higgs Boson Production With Up To 86 Fb 1 Of Data
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Book Synopsis Combined CDF and D0 Upper Limits on Standard Model Higgs-Boson Production with Up to 6.7 Fb$^{-1}$ of Data by :
Download or read book Combined CDF and D0 Upper Limits on Standard Model Higgs-Boson Production with Up to 6.7 Fb$^{-1}$ of Data written by and published by . This book was released on 2010 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: We combine results from CDF and D0 on direct searches for the standard model (SM) Higgs boson (H) in p{bar p} collisions at the Fermilab Tevatron at (square root)s = 1.96 TeV. Compared to the previous Tevatron Higgs search combination more data have been added, additional new channels have been incorporated, and some previously used channels have been reanalyzed to gain sensitivity. We use the latest parton distribution functions and gg --> H theoretical cross sections when comparing our limits to the SM predictions. With up to 5.9 fb−1 of data analyzed at CDF, and up to 6.7 fb−1 at D0, the 95% C.L. upper limits on Higgs boson production are factors of 1.56 and 0.68 the values of the SM cross section for a Higgs boson mass of m{sub H} = 115 GeV/c2 and 165 GeV/c2. We exclude, at the 95% C.L., a new and larger region at high mass between 158
Book Synopsis Combined CDF and D0 Upper Limits on Standard Model Higgs Boson Production with Up to 8.6 Fb-1 of Data by :
Download or read book Combined CDF and D0 Upper Limits on Standard Model Higgs Boson Production with Up to 8.6 Fb-1 of Data written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We combine results from CDF and D0 on direct searches for the standard model (SM) Higgs boson (H) in p{bar p} collisions at the Fermilab Tevatron at √s = 1.96 TeV. Compared to the previous Tevatron Higgs boson search combination more data have been added, additional channels have been incorporated, and some previously used channels have been reanalyzed to gain sensitivity. We use the MSTW08 parton distribution functions and the latest theoretical cross sections when comparing our limits to the SM predictions. With up to 8.2 fb−1 of data analyzed at CDF and up to 8.6 fb−1 at D0, the 95% C.L. our upper limits on Higgs boson production are factors of 1.17, 1.71, and 0.48 times the values of the SM cross section for Higgs bosons of mass m{sub H} = 115 GeV/c2, 140 GeV/c2, and 165 GeV/c2, respectively. The corresponding median upper limits expected in the absence of Higgs boson production are 1.16, 1.16, and 0.57. There is a small (≈ 1[sigma]) excess of data events with respect to the background estimation in searches for the Higgs boson in the mass range 125
Book Synopsis Combined CDF and D0 Upper Limits on Standard Model Higgs Boson Production with Up to 8.2 Fb$^{-1}$ of Data by :
Download or read book Combined CDF and D0 Upper Limits on Standard Model Higgs Boson Production with Up to 8.2 Fb$^{-1}$ of Data written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We combine results from CDF and D0's direct searches for the standard model (SM) Higgs boson (H) produced in p{bar p} collisions at the Fermilab Tevatron at √s = 1.96 TeV. The results presented here include those channels which are most sensitive to Higgs bosons with mass between 130 and 200 GeV/c2, namely searches targeted at Higgs boson decays to W+W−, although acceptance for decays into [tau]{sup.
Book Synopsis Combined CDF and D0 Upper Limits on Standard Model Higgs-Boson Production with 2.1-5.4 Fb-1 of Data by :
Download or read book Combined CDF and D0 Upper Limits on Standard Model Higgs-Boson Production with 2.1-5.4 Fb-1 of Data written by and published by . This book was released on 2009 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt: We combine results from CDF and D0 on direct searches for a standard model (SM) Higgs boson (H) in p{bar p} collisions at the Fermilab Tevatron at (square root)s = 1.96 TeV. Compared to the previous Tevatron Higgs search combination more data have been added and some previously used channels have been reanalyzed to gain sensitivity. We use the latest parton distribution functions and gg --> H theoretical cross sections when comparing our limits to the SM predictions. With 2.0-4.8 fb−1 of data analyzed at CDF, and 2.1-5.4 fb−1 at D0, the 95% C.L. upper limits on Higgs boson production are a factor of 2.70 (0.94) times the SM cross section for a Higgs boson mass of m{sub H} = 115 (165) GeV/c2. The corresponding median upper limits expected in the absence of Higgs boson production are 1.78 (0.89). The mass range excluded at 95% C.L. for a SM Higgs is 163
Book Synopsis Combined CDF and D0 Upper Limits on $gg\to H\to W^+W^-$ and Constraints on the Higgs Boson Mass in Fourth-generation Fermion Models with Up to 8.2 Fb$^{-1}$ of Data by :
Download or read book Combined CDF and D0 Upper Limits on $gg\to H\to W^+W^-$ and Constraints on the Higgs Boson Mass in Fourth-generation Fermion Models with Up to 8.2 Fb$^{-1}$ of Data written by and published by . This book was released on 2011 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: We combine results from searches by the CDF and D0 Collaborations for a standard model Higgs boson (H) in the processes gg → H → W+W− and gg → H → ZZ in p{bar p} collisions at the Fermilab Tevatron Collider at √s = 1.96 TeV. With 8.2 fb−1 of integrated luminosity analyzed at CDF and 8.1 fb−1 at D0, the 95% C.L. upper limit on [sigma](gg → H) x [Beta](H → W+W−) is 1.01 pb at m{sub H} = 120 GeV, 0.40 pb at m{sub H} = 165 GeV, and 0.47 pb at m{sub H} = 200 GeV. Assuming the presence of a fourth sequential generation of fermions with large masses, we exclude at the 95% Confidence Level a standard-model-like Higgs boson with a mass between 124 and 286 GeV.
Book Synopsis Combined Upper Limit on Standard Model Higgs Boson Production at CDF. by :
Download or read book Combined Upper Limit on Standard Model Higgs Boson Production at CDF. written by and published by . This book was released on 2012 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Higgs boson is the only elementary particle predicted by the Standard Model (SM) that has neither been confirmed nor refuted. The CDF collaboration has performed SM Higgs searches in many channels using p{bar p} collisions at a centre-of-mass energy √s = 1.96 TeV. We present the latest combined Higgs boson search at CDF. Since the previous year's combination, the sensitivity is increased through the addition of new channels, the improvement of existing channels and the addition of new data samples. We also use the latest parton distribution functions and gg → H theoretical cross sections when modelling the signal event yields. Using integrated luminosities of up to 8.2 fb−1, we observe a good agreement between data and the background prediction. Since we do not see a Higgs boson excess, we set 95% CL upper limits on the Higgs boson cross section in the range between 100 and 200 GeV/c2, with 5 GeV/c2 increments. The observed (expected) limits for a 115 and a 165 GeV/c2 Higgs boson are 1.55 (1.49) and 0.75 (0.79) x SM, respectively. Since last year, the Higgs boson excluded range by CDF is extended to 156.5 - 173.7 and 100 - 104.5 GeV/c2.
Book Synopsis Combined CDF and D0 Upper Limits on MSSM Higgs Boson Production in Tau-tau Final States with Up to 2.2 Fb-1 by :
Download or read book Combined CDF and D0 Upper Limits on MSSM Higgs Boson Production in Tau-tau Final States with Up to 2.2 Fb-1 written by and published by . This book was released on 2010 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Combined results are presented on the search for a neutral Higgs boson in the di-tau final state using 1.8 fb−1 and 2.2 fb−1 of integrated luminosity collected at the CDF and D0 experiments respectively. Data were collected in p{bar p} collisions at a centre of mass energy of 1.96 TeV during RunII of the Tevatron. Limits are set on the cross section x branching ratio ranging from 13.6 pb to 0.653 pb for Higgs masses from 90 GeV to 200 GeV respectively. The results are then interpreted as limits in four different benchmark scenarios within the framework of the MSSM.
Book Synopsis Combined CDF and D0 Searches for the Standard Model Higgs Boson Decaying to Two Photons with Up to 8.2 Fb^-1 by :
Download or read book Combined CDF and D0 Searches for the Standard Model Higgs Boson Decaying to Two Photons with Up to 8.2 Fb^-1 written by and published by . This book was released on 2011 with total page 11 pages. Available in PDF, EPUB and Kindle. Book excerpt: We combine results from CDF and D0's direct searches for the standard model (SM) Higgs boson (H) produced in p{bar p} collisions at the Fermilab Tevatron at √s = 1.96 TeV, focusing on the decay H → [gamma][gamma]. We compute upper limits on the Higgs boson production cross section times the decay branching fraction in the range 100
Book Synopsis Combined Upper Limit on Standard Model Higgs Boson Production at D0 in $p \bar{p}$ Collisions at $\sqrt{s} by :
Download or read book Combined Upper Limit on Standard Model Higgs Boson Production at D0 in $p \bar{p}$ Collisions at $\sqrt{s} written by and published by . This book was released on 2010 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The latest searches for the Standard Model Higgs boson at a centre-of-mass energy of √s = 1.96 TeV with the D0 and the CDF detectors at the Fermilab Tevatron collider are presented. For the first time since the LEP experiments the sensitivity for a Standard Model Higgs boson has been reached at a Higgs boson mass of 170 GeV/c2.
Book Synopsis Symmetry and the Standard Model by : Matthew Robinson
Download or read book Symmetry and the Standard Model written by Matthew Robinson and published by Springer Science & Business Media. This book was released on 2011-08-17 with total page 343 pages. Available in PDF, EPUB and Kindle. Book excerpt: While theoretical particle physics is an extraordinarily fascinating field, the incredibly fast pace at which it moves along, combined with the huge amount of background information necessary to perform cutting edge research, poses a formidable challenge for graduate students. This book represents the first in a series designed to assist students in the process of transitioning from coursework to research in particle physics. Rather than reading literally dozens of physics and mathematics texts, trying to assimilate the countless ideas, translate notations and perspectives, and see how it all fits together to get a holistic understanding, this series provides a detailed overview of the major mathematical and physical ideas in theoretical particle physics. Ultimately the ideas will be presented in a unified, consistent, holistic picture, where each topic is built firmly on what has come before, and all topics are related in a clear and intuitive way. This introductory text on quantum field theory and particle physics provides both a self-contained and complete introduction to not only the necessary physical ideas, but also a complete introduction to the necessary mathematical tools. Assuming minimal knowledge of undergraduate physics and mathematics, this book lays both the mathematical and physical groundwork with clear, intuitive explanations and plenty of examples. The book then continues with an exposition of the Standard Model of Particle Physics, the theory that currently seems to explain the universe apart from gravity. Furthermore, this book was written as a primer for the more advanced mathematical and physical ideas to come later in this series.
Book Synopsis Discovery and Measurement of the Higgs Boson in the WW Decay Channel by : David Hall
Download or read book Discovery and Measurement of the Higgs Boson in the WW Decay Channel written by David Hall and published by Springer. This book was released on 2015-06-15 with total page 175 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes the stand-alone discovery and measurement of the Higgs boson in its decays to two W bosons using the Run-I ATLAS dataset. This is the most precise measurement of gluon-fusion Higgs boson production and is among the most significant results attained at the LHC. The thesis provides an exceptionally clear exposition on a complicated analysis performed by a large team of researchers. Aspects of the analysis performed by the author are explained in detail; these include new methods for evaluating uncertainties on the jet binning used in the analysis and for estimating the background due to associated production of a W boson and an off-shell photon. The thesis also describes a measurement of the WW cross section, an essential background to Higgs boson production. The primary motivation of the LHC was to prove or disprove the existence of the Higgs boson. In 2012, CERN announced this discovery and the resultant ATLAS publication contained three decay channels: gg, ZZ, and WW.
Book Synopsis Constraints on Models of the Higgs Boson with Exotic Spin and Parity Using Decays to Bottom-Antibottom Quarks in the Full CDF Data Set by :
Download or read book Constraints on Models of the Higgs Boson with Exotic Spin and Parity Using Decays to Bottom-Antibottom Quarks in the Full CDF Data Set written by and published by . This book was released on 2015 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, a search for particles with the same mass and couplings as those of the standard model Higgs boson but different spin and parity quantum numbers is presented. We test two specific alternative Higgs boson hypotheses: a pseudoscalar Higgs boson with spin-parity JP = 0- and a gravitonlike Higgs boson with JP = 2+, assuming for both a mass of 125 GeV/c2. We search for these exotic states produced in association with a vector boson and decaying into a bottom-antibottom quark pair. The vector boson is reconstructed through its decay into an electron or muon pair, or an electron or muon and a neutrino, or it is inferred from an imbalance in total transverse momentum. We use expected kinematic differences between events containing exotic Higgs bosons and those containing standard model Higgs bosons. The data were collected by the CDF experiment at the Tevatron proton-antiproton collider, operating at a center-of-mass energy of √s = 1.96 TeV, and correspond to an integrated luminosity of 9.45 fb-1. We exclude deviations from the predictions of the standard model with a Higgs boson of mass 125 GeV/c2 at the level of 5 standard deviations, assuming signal strengths for exotic boson production equal to the prediction for the standard model Higgs boson, and set upper limits of approximately 30% relative to the standard model rate on the possible rate of production of each exotic state.
Book Synopsis Gauge Theories of the Strong, Weak, and Electromagnetic Interactions by : Chris Quigg
Download or read book Gauge Theories of the Strong, Weak, and Electromagnetic Interactions written by Chris Quigg and published by Princeton University Press. This book was released on 2013-09-22 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt: This completely revised and updated graduate-level textbook is an ideal introduction to gauge theories and their applications to high-energy particle physics, and takes an in-depth look at two new laws of nature--quantum chromodynamics and the electroweak theory. From quantum electrodynamics through unified theories of the interactions among leptons and quarks, Chris Quigg examines the logic and structure behind gauge theories and the experimental underpinnings of today's theories. Quigg emphasizes how we know what we know, and in the era of the Large Hadron Collider, his insightful survey of the standard model and the next great questions for particle physics makes for compelling reading. The brand-new edition shows how the electroweak theory developed in conversation with experiment. Featuring a wide-ranging treatment of electroweak symmetry breaking, the physics of the Higgs boson, and the importance of the 1-TeV scale, the book moves beyond established knowledge and investigates the path toward unified theories of strong, weak, and electromagnetic interactions. Explicit calculations and diverse exercises allow readers to derive the consequences of these theories. Extensive annotated bibliographies accompany each chapter, amplify points of conceptual or technical interest, introduce further applications, and lead readers to the research literature. Students and seasoned practitioners will profit from the text's current insights, and specialists wishing to understand gauge theories will find the book an ideal reference for self-study. Brand-new edition of a landmark text introducing gauge theories Consistent attention to how we know what we know Explicit calculations develop concepts and engage with experiment Interesting and diverse problems sharpen skills and ideas Extensive annotated bibliographies
Book Synopsis Third generation SUSY and t ̄t +Z production by : Josh McFayden
Download or read book Third generation SUSY and t ̄t +Z production written by Josh McFayden and published by Springer. This book was released on 2014-06-06 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis describes searches for new particles predicted by the super symmetry (SUSY) theory, a theory extending beyond the current Standard Model of particle physics, using the ATLAS detector at the CERN Large Hadron Collider. The thesis focuses on searches for stop and sbottom squarks, the SUSY partners of the top and bottom quarks, which are expected to be lighter than the partners of the first and second generation quarks and therefore good candidates for the first evidence of SUSY. It describes novel techniques for estimating and rejecting the Standard-Model backgrounds to searches for these particles. It also includes an independent analysis seeking to constrain the Standard Model ttZ background process, which also represents the first ATLAS search for this rare process at the LHC. The stop squark analysis described, with substantial leading contributions from the author, is the first search for these particles at the LHC to use the jets plus missing transverse energy plus 0-lepton signature and provides the world's best limits on the stop mass for light neutralino LSPs. All in all, the thesis describes three different world-leading analyses in both Standard Model and SUSY physics and therefore represents a major contribution to the field.
Book Synopsis Improving Higgs Sensitivity at CDF by Introducing New Muon Triggers by :
Download or read book Improving Higgs Sensitivity at CDF by Introducing New Muon Triggers written by and published by . This book was released on 2010 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for Standard Model Higgs boson production in the H → WW → l?jj channel using 5.7 fb−1 of CDF II data is presented. The search is performed using a matrix element technique in which event probability densities for the signal and background hypotheses are calculated and used to create a powerful disciminator (called the event probability discriminant, EPD). The EPD distributions for signal and background are fit to the data using a binned likelihood approach to search for the Higgs boson signal. To improve the limits on the H production cross section, a new muon category, CMP, is added. No evidence for a Higgs boson signal is observed, and 95% confidence level upper limits on the H cross section times the branching ratio of the Higgs boson to decay to two W of?(p{bar p} → H) x BR(H → WW)/SM
Book Synopsis Updated Combination of Searches for the Standard Model Higgs Boson at the D0 Experiment in 9.7 Fb${̂-1}$ of Data by :
Download or read book Updated Combination of Searches for the Standard Model Higgs Boson at the D0 Experiment in 9.7 Fb${̂-1}$ of Data written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Constraints on New Phenomena Via Higgs Boson Couplings and Invisible Decays with the ATLAS Detector by :
Download or read book Constraints on New Phenomena Via Higgs Boson Couplings and Invisible Decays with the ATLAS Detector written by and published by . This book was released on 2015 with total page 52 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ATLAS experiment at the LHC has measured the Higgs boson couplings and mass, and searched for invisible Higgs boson decays, using multiple production and decay channels with up to 4.7 fb-1 of pp collision data at √s=7 TeV and 20.3 fb-1 at √s=8 TeV. In the current study, the measured production and decay rates of the observed Higgs boson in the [gamma][gamma], ZZ, W W , Z[gamma], bb, [tau] [tau] , and [mu][mu] decay channels, along with results from the associated production of a Higgs boson with a top-quark pair, are used to probe the scaling of the couplings with mass. The limits are set on parameters in extensions of the Standard Model including a composite Higgs boson, an additional electroweak singlet, and two-Higgs-doublet models. Together with the measured mass of the scalar Higgs boson in the [gamma][gamma] and ZZ decay modes, a lower limit is set on the pseudoscalar Higgs boson mass of mA > 370 GeV in the "hMSSM" simplified Minimal Supersymmetric Standard Model. Results from direct searches for heavy Higgs bosons are also interpreted in the hMSSM. Finally, direct searches for invisible Higgs boson decays in the vector-boson fusion and associated production of a Higgs boson with W/Z (Z → ll, W/Z → jj) modes are statistically combined to set an upper limit on the Higgs boson invisible branching ratio of 0.25. As a result, the use of the measured visible decay rates in a more general coupling fit improves the upper limit to 0.23, constraining a Higgs portal model of dark matter.
