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Download A Search For The Standard Model Higgs Boson In The Missing Energy And Acoplanar B Jet Topology At S1 2 full books in PDF, epub, and Kindle. Read online A Search For The Standard Model Higgs Boson In The Missing Energy And Acoplanar B Jet Topology At S1 2 ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Author :
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ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (873 download)
Download or read book A Search for the Standard Model Higgs Boson in the Missing Energy and Acoplanar B-jet Topology at S**1/2 written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (16 download)
Download or read book A Search for the Standard Model Higgs Boson in the Missing Energy and Acoplanar B-jet Topology at S**ư written by and published by . This book was released on 2008 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 139 pages
Book Rating : 4.:/5 (873 download)
Download or read book Search for the Standard Model Higgs Boson in the Missing Energy Topology with written by and published by . This book was released on 2009 with total page 139 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the Standard Model Higgs boson in the missing energy and acoplanar b-jet topology is reported, using an integrated luminosity of 0.93 fb−1 recorded by the D0 detector at the Fermilab Tevatron p{bar p} Collider. The analysis includes signal contributions from p{bar p} → ZH → [nu]{bar {nu}}b{bar b}, as well as from WH production in which the charged lepton from the W boson decay is undetected. Neural networks are used to separate signal from background. In the absence of a signal, limits are set on [sigma](p{bar p} → VH) x B(H → b{bar b}) at the 95% C.L. of 2.6-2.3 pb, for Higgs boson masses in the range 105-135 GeV, where V = W, Z. The corresponding expected limits range from 2.8 to 2.0 pb. Potential improvements to the analysis with an extended dataset totalling 4 fb−1 are also discussed. Essential maintenance related to the increased luminosity and RunIIb upgrade was carried out on the impact parameter (IP) based b-tagging trigger tool and the effect of the changes on the b-tagger's performance was investigated.
Author : Xidong Wu
Publisher :
ISBN 13 :
Total Pages : 142 pages
Book Rating : 4.:/5 (89 download)
Download or read book A Search for the Standard Model Higgs Boson with Missing Mass Final States at Center-of-mass Energy at 188.6 GeV with the ALEPH Detector at LEP written by Xidong Wu and published by . This book was released on 2000 with total page 142 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Thomas C. Greening
Publisher :
ISBN 13 :
Total Pages : 386 pages
Book Rating : 4.:/5 (89 download)
Download or read book Search for the Standard Model Higgs Boson in Topologies with a Charged Lepton Pair at a Center-of-mass Energy of 188.6 GeV with the ALEPH Detector written by Thomas C. Greening and published by . This book was released on 1999 with total page 386 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for the Standard Model Higgs Boson in the Missing Energy Topology with DØ written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 236 pages
Book Rating : 4.:/5 (727 download)
Download or read book Search for the Standard Model Higgs Boson in the Missing Transverse Energy and B-jet Signature in Proton-antiproton Collisions at a Center-of-mass Energy of 1.96 TeV. written by and published by . This book was released on 2009 with total page 236 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on the results of a search for the standard model Higgs boson produced in association with a W or Z boson in p{bar p} collisions at (square root)s = 1.96 TeV recorded by the CDF II experiment at the Tevatron in a data sample corresponding to an integrated luminosity of 2.1 fb−1. We consider events having no identified charged leptons, a large imbalance in transverse momentum, and two or three jets where at least one jet contains a secondary vertex consistent with the decay of a b hadron. The main backgrounds are modeled with innovative techniques using data. The sensitivity of the search is optimized using multivariate discriminant techniques. We find good agreement between data and the standard model predictions. We place 95% confidence level upper limits on production cross section times branching ratio for several Higgs boson masses ranging from 110 GeV=c2 to 150 GeV=c2. For a mass of 115 GeV=c2 the observed (expected) limit is 6.9 (5.6) times the standard model prediction.
Author : Peter A. McNamara
Publisher :
ISBN 13 :
Total Pages : 288 pages
Book Rating : 4.:/5 (89 download)
Download or read book The Search for the Standard Model Higgs Boson at ALEPH written by Peter A. McNamara and published by . This book was released on 2002 with total page 288 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Theodoros Christoudias
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (16 download)
Download or read book Search for the Standard Model Higgs Boson in the Missing Energy Topology with DO written by Theodoros Christoudias and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Francesco Pandolfi
Publisher : Springer Science & Business Media
ISBN 13 : 3319009036
Total Pages : 137 pages
Book Rating : 4.3/5 (19 download)
Download or read book Search for the Standard Model Higgs Boson in the H → ZZ → l + l - qq Decay Channel at CMS written by Francesco Pandolfi and published by Springer Science & Business Media. This book was released on 2013-08-15 with total page 137 pages. Available in PDF, EPUB and Kindle. Book excerpt: The theoretical foundations of the Standard Model of elementary particles relies on the existence of the Higgs boson, a particle which has been revealed for the first time by the experiments run at the Large Hadron Collider (LHC) in 2012. As the Higgs boson is an unstable particle, its search strategies were based on its decay products. In this thesis, Francesco Pandolfi conducted a search for the Higgs boson in the H → ZZ → l + l - qq Decay Channel with 4.6 fb -1 of 7 TeV proton-proton collision data collected by the Compact Muon Solenoid (CMS) experiment. The presence of jets in the final state poses a series of challenges to the experimenter: both from a technical point of view, as jets are complex objects and necessitate of ad-hoc reconstruction techniques, and from an analytical one, as backgrounds with jets are copious at hadron colliders, therefore analyses must obtain high degrees of background rejection in order to achieve competitive sensitivity. This is accomplished by following two directives: the use of an angular likelihood discriminant, capable of discriminating events likely to originate from the decay of a scalar boson from non-resonant backgrounds, and by using jet parton flavor tagging, selecting jets compatible with quark hadronization and discarding jets more likely to be initiated by gluons. The events passing the selection requirements in 4.6 fb -1 of data collected by the CMS detector are examined, in the search of a possible signal compatible with the decay of a heavy Higgs boson. The thesis describes the statistical tools and the results of this analysis. This work is a paradigm for studies of the Higgs boson with final states with jets. The non-expert physicists will enjoy a complete and eminently readable description of a proton-proton collider analysis. At the same time, the expert reader will learn the details of the searches done with jets at CMS.
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ISBN 13 :
Total Pages : 188 pages
Book Rating : 4.:/5 (16 download)
Download or read book Search for the Standard Model Higgs Boson in ZH {u2192} V$\bar{v}$b$\bar{b}$ Channel in P$\bar{p}$ Collisions at {u221A}s written by and published by . This book was released on 2011 with total page 188 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the standard model Higgs boson is performed in 5.2 fb-1 of p$ar{p}$ collisions at p √s = 1.96 TeV, collected with the DØ detector at the Fermilab Tevatron. The final state considered is a pair of b jets with large missing transverse energy, as expected from p$ar{p}$→ ZH → v$ar{v}$b$ar{b}$ production. The search is also sensitive to the WH → lvb$ar{b}$ channel, where the charged lepton is not identified. Boosted decision trees are used to discriminate signal from background. Good agreement is observed between data and expected backgrounds, and, for a Higgs-boson mass of 115 GeV, a limit is set at 95% C.L. on the cross section multiplied by branching fraction of (p$ar{p}$ → (Z/W)H) × (H → b$ar{b}$) that is a factor 4.57 expected and 3.73 observed larger than the value expected from the standard model.
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ISBN 13 :
Total Pages : 274 pages
Book Rating : 4.:/5 (16 download)
Download or read book Search for the Standard Model Higgs Boson in Association with a W Boson at written by and published by . This book was released on 2013 with total page 274 pages. Available in PDF, EPUB and Kindle. Book excerpt: I present a search for the standard model Higgs boson, H, produced in association with a W boson in data events containing a charged lepton (electron or muon), missing energy, and two or three jets. The data analysed correspond to 9.7 fb-1 of integrated luminosity collected at a center-of-momentum energy of √s = 1.96 TeV with the D0 detector at the Fermilab Tevatron p$ar{p}$ collider. This search uses algorithms to identify the signature of bottom quark production and multivariate techniques to improve the purity of H → b$ar{b}$ production. We validate our methodology by measuring WZ and ZZ production with Z → b$ar{b}$ and find production rates consistent with the standard model prediction. For a Higgs boson mass of 125 GeV, we determine a 95% C.L. upper limit on the production of a standard model Higgs boson of 4.8 times the standard model Higgs boson production cross section, while the expected limit is 4.7 times the standard model production cross section. I also present a novel method for improving the energy resolution for charged particles within hadronic signatures. This is achieved by replacing the calorimeter energy measurement for charged particles within a hadronic signature with the tracking momentum measurement. This technique leads to a ̃20% improvement in the jet energy resolution, which yields a ̃7% improvement in the reconstructed dijet mass width for H → b$ar{b}$ events. The improved energy calculation leads to a ̃5% improvement in our expected 95% C.L. upper limit on the Higgs boson production cross section.
Author :
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ISBN 13 :
Total Pages : 477 pages
Book Rating : 4.:/5 (16 download)
Download or read book Search for the Higgs Boson and Rare Standard Model Processes in the ET+B-Jets Signature at the Collider Detector at Fermilab written by and published by . This book was released on 2011 with total page 477 pages. Available in PDF, EPUB and Kindle. Book excerpt: We study rare processes of the standard model of particle physics (SM) in events with missing transverse energy ET, no leptons, and two or three jets, of which at least one is identified as originating from a $b$-quark (ET+b-jets signature). We present a search for the SM Higgs boson produced in association with a $W$ or $Z$ boson when the Higgs decays into \bbbar. We consider the scenario where $Z \to \nu \nu$, or $W \to l \nu$ and the lepton escapes detection. This dissertation analyzes $7.8\̃mbox{fb${̂-1}$}$ of data collected by the CDFĨI experiment at Fermilab. For the first time, we analyze events with \emph{relaxed kinematic} requirements, yielding an increase of 30- 40\% in acceptance to the $WH/ZH$ signal. We collect events from three different triggers and parametrize the efficiency of their logical combination (OR) using a novel artificial neural network ($NN$) technique. To increase the sensitivity to the signal, we implement a $NN$ to remove the huge instrumental background. An additional $NN$ is used to discriminate the Higgs signal from the remaining background. We check our background modeling by comparing data against backgrounds in many control regions, and find good agreement. Observing no significant excess in the data, we place 95\% confidence level (C.L.) upper limits on the Higgs boson production cross section. For a mass of $115\̃mbox{GeV/$c2̂$}$ the expected (observed) limit is $2.9$ ($2.3$) times the standard model prediction. Compared to the last iteration of this analysis, this result improves the significance by 10\% throughout the $100-150\̃mbox{GeV/$c2̂$}$ mass range. This is one of the most sensitive at the Tevatron in this mass range. We cross-check the tools developed in this dissertation by measuring the cross-section of top pair, electroweak single top and diboson ($WZ+ZZ$) production.
Download or read book A Search for the Higgs Boson Using Neural Networks in Events with Missing Energy and \boldit{b}-quark Jets in $p\bar P$ Collisions at $\sqrt{s} written by and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a search for the standard model Higgs boson produced in association with a W or Z boson in p{bar p} collisions at (square root)s = 1.96 TeV recorded by the CDF II experiment at the Tevatron in a data sample corresponding to an integrated luminosity of 2.1 fb−1. We consider events which have no identified charged leptons, an imbalance in transverse momentum, and two or three jets where at least one jet is consistent with originating from the decay of a b hadron. We find good agreement between data and predictions. We place 95% confidence level upper limits on the production cross section for several Higgs boson masses ranging from 110 GeV/c2 to 150 GeV/c2. For a mass of 115 GeV/c2 the observed (expected) limit is 6.9 (5.6) times the standard model prediction.
Author :
Publisher :
ISBN 13 :
Total Pages : 151 pages
Book Rating : 4.:/5 (16 download)
Download or read book Search for the Standard Model Higgs Boson in the WH{u2192} ? V B$\bar{b}$ Channel with the D0 Detector written by and published by . This book was released on 2009 with total page 151 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the Standard Model Higgs boson is performed in 4.0 fb-1 of p$ar{p}$ collisions at √s = 1.96 TeV, collected with the DØ detector at the Fermilab Tevatron. The final state considered is a pair of b-jets with large missing transverse energy and one hadronic tau decay as expected from the reaction p$ar{p}$ → WH → ? v b$ar{b}$. Boosted decision trees are used to discriminate the signal from the background. Good agreement is observed between data and expected backgrounds. For a Higgs boson mass of 115 GeV, a limit is set at 95% C.L. on the cross-section times branching fraction of (p$ar{p}$→ (Z/W)H)×(H → b$ar{b}$) which is 14 times larger than the Standard Model value.
Author : Giulia Di Gregorio
Publisher : Springer Nature
ISBN 13 : 3031200136
Total Pages : 229 pages
Book Rating : 4.0/5 (312 download)
Download or read book A Beauty-ful Boson written by Giulia Di Gregorio and published by Springer Nature. This book was released on 2023-01-01 with total page 229 pages. Available in PDF, EPUB and Kindle. Book excerpt: The analysis described in this thesis is the search for the Higgs boson, decaying into bb pair, in the associated production with a vector boson, in the extreme Higgs boson transverse momentum region where the Higgs boson is reconstructed using the large-R jet technique. The use of the large-R jets allows to add a part of the phase space unexplored so far, which is particularly sensitive to possible new physics. The analysed data have been collected at LHC by the ATLAS detector between 2015 and 2018 at a centre-of-mass energy of √s = 13 TeV. The same dataset has been used to perform the differential pp → ZH and pp → WH cross-section measurements used to extract the information on the Higgs couplings and to put limits on Beyond the Standard Model effects. Furthermore the analysis has been re-used to perform a cross-section measurement of the diboson ZZ and WZ processes because the diboson and the Higgs processes have a similar topology. For the first time the ZZ(bb) and WZ(bb) cross-sections are measured at √s = 13 TeV and the observed cross-section measurements are consistent with the Standard Model predictions.
Download or read book Updated Search for the Standard Model Higgs Boson in Events with Jets and Missing Transverse Energy Using the Full CDF Data Set written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
