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Phenomenological Analysis Of Higgs Boson Production Through Gluon Fusion In Association With Jets
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Book Synopsis Phenomenological Analysis of Higgs Boson Production Through Gluon Fusion in Association with Jets by :
Download or read book Phenomenological Analysis of Higgs Boson Production Through Gluon Fusion in Association with Jets written by and published by . This book was released on 2016 with total page 62 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, we present a detailed phenomenological analysis of the production of a Standard Model Higgs boson in association with up to three jets. We consider the gluon fusion channel using an effective theory in the large top-quark mass limit. Higgs boson production in gluon fusion constitutes an irreducible background to the vector boson fusion (VBF) process; hence the precise knowledge of its characteristics is a prerequisite for any measurement in the VBF channel. The calculation is carried out at next-to-leading order (NLO) in QCD in a fully automated way by combining the two programs GoSam and Sherpa. We present numerical results for a large variety of observables for both standard cuts and VBF selection cuts. We find that for all jet multiplicities the NLO corrections are sizeable. This is particularly true in the presence of kinematic selections enhancing the VBF topology, which are based on vetoing additional jet activity. In this case, precise predictions for the background can be made using our calculation by taking the difference between the inclusive H+2 jets and the inclusive H+3 jets result.
Book Synopsis Phenomenological Analysis of Higgs Boson Production Throught Gluon Fusion in Association with Jets by :
Download or read book Phenomenological Analysis of Higgs Boson Production Throught Gluon Fusion in Association with Jets written by and published by . This book was released on 2015 with total page 53 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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 Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry by : Marc Christopher Thomas
Download or read book Beyond Standard Model Collider Phenomenology of Higgs Physics and Supersymmetry written by Marc Christopher Thomas and published by Springer. This book was released on 2016-08-01 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis studies collider phenomenology of physics beyond the Standard Model at the Large Hadron Collider (LHC). It also explores in detail advanced topics related to Higgs boson and supersymmetry – one of the most exciting and well-motivated streams in particle physics. In particular, it finds a very large enhancement of multiple Higgs boson production in vector-boson scattering when Higgs couplings to gauge bosons differ from those predicted by the Standard Model. The thesis demonstrates that due to the loss of unitarity, the very large enhancement for triple Higgs boson production takes place. This is a truly novel finding. The thesis also studies the effects of supersymmetric partners of top and bottom quarks on the Higgs production and decay at the LHC, pointing for the first time to non-universal alterations for two main production processes of the Higgs boson at the LHC–vector boson fusion and gluon–gluon fusion. Continuing the exploration of Higgs boson and supersymmetry at the LHC, the thesis extends existing experimental analysis and shows that for a single decay channel the mass of the top quark superpartner below 175 GeV can be completely excluded, which in turn excludes electroweak baryogenesis in the Minimal Supersymmetric Model. This is a major new finding for the HEP community. This thesis is very clearly written and the introduction and conclusions are accessible to a wide spectrum of readers.
Book Synopsis NLO Higgs Boson Production Plus One and Two Jets Using the POWHEG BOX, MadGraph4 and MCFM. by :
Download or read book NLO Higgs Boson Production Plus One and Two Jets Using the POWHEG BOX, MadGraph4 and MCFM. written by and published by . This book was released on 2012 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a next-to-leading order calculation of Higgs boson production plus one and two jets via gluon fusion interfaced to shower Monte Carlo programs, implemented according to the POWHEG method. For this implementation we have used a new interface of the POWHEG BOX with MadGraph4, that generates the codes for generic Born and real processes automatically. The virtual corrections have been taken from the MCFM code. We carry out a simple phenomenological study of our generators, comparing them among each other and with fixed next-to-leading order results.
Book Synopsis A Beauty-ful Boson by : Giulia Di Gregorio
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.
Book Synopsis Discovery of the Higgs Boson with the Diphoton Decay Channel and First Differential Cross-section Measurements with ATLAS by :
Download or read book Discovery of the Higgs Boson with the Diphoton Decay Channel and First Differential Cross-section Measurements with ATLAS written by and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: In July 2012, a Higgs boson was discovered by both the ATLAS and CMS experiments. This thesis presents the most recent version of the H ->[gamma][gamma] analysis that was used in the discovery. Since the discovery, focus has shifted to measure the properties of the Higgs boson. The analysis presented here is the analysis of the Higgs couplings, where events are divided into twelve categories defined to isolate the various production processes. Specific focus is given to the vector boson fusion (VBF) process where the Higgs boson is produced in association with two foward/backward jets. Due to its small theory errors, the VBF process can allow for very precise measurements of the Higgs boson's properties. Also presented are the first differential cross section measurements for the Higgs boson as measured in the diphoton decay channel. Distributions in data are unfolded to particle level and compared with the latest Monte Carlo event generators for gluon-gluon fusion. Many distributions concentrate on the kinematics of the Higgs boson produced in association with jets. Finally, a proposal for a 1-jet VBF region for the high-luminosity LHC is proposed based on the difference in rapidity between the Higgs boson and the leading jet. This region shows good discrimination power against gluon-gluon fusion events and has been shown to discriminate against beyond the Standard Model couplings.
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 . This book was released on 2015 with total page 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 Measurement of Higgs Boson Production Via Gluon Fusion and Vector-boson Fusion in the H->WW* Decay Mode with the ATLAS Experiment at the LHC at [square Root]s by : Ralf Gugel
Download or read book Measurement of Higgs Boson Production Via Gluon Fusion and Vector-boson Fusion in the H->WW* Decay Mode with the ATLAS Experiment at the LHC at [square Root]s written by Ralf Gugel and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Abstract: On the 4 th of July 2012 the observation of a new neutral particle was announced by the ATLAS [1] and CMS [2] Collaborations. This particle is by now generally considered as the Higgs boson H predicted [3, 4] in the Standard Model of particle physics. Its mass of m H = 125.09 ± 0.24 GeV [5] implies a rich set of final states which allow for experimental studies in regards to this particle and searches for deviations from the properties predicted by the Standard Model. In this thesis a measurement of the gluon-fusion and vector-boson fusion production cross sections times H→WW* branching ratio is presented using final states with one electron and one muon. The measurement is based on proton- proton collisions with an integrated luminosity of 36.1 fb -1 √ recorded with the ATLAS detector at the CERN Large Hadron Collider ( LHC ) at s = 13 TeV in 2015 and 2016. Signal-like events are selected in categories with different jet multiplicities. The results are extracted by means of a binned maximum-likelihood fit. To this end, either distributions in multiple discriminant variables or the response of a multivariate classifier are used depending on the category. The results are found to be well compatible with the Standard Model predictions. This analysis is extrapolated to estimate the future precision of such a measurement at the end of the High-Luminosity LHC programme [6]. This extrapolated analysis is combined with analogously extrapolated analyses targeting other production and decay modes of the Higgs boson. Based on this combination the expected precision is determined for future measurements of couplings between the Higgs boson and other particles. Thereby an estimation is given for the anticipated sensitivity of these analyses to signs of physics beyond the Standard Model. In addition studies are presented to identify sources of electron charge misidentification in the reconstruction algorithms employed in the ATLAS Collaboration.
Book Synopsis Search for the Higgs Boson in Lepton, Tau, and Jets Final States by :
Download or read book Search for the Higgs Boson in Lepton, Tau, and Jets Final States written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for the standard model Higgs boson in final states with an electron or muon and a hadronically decaying tau lepton in association with two or more jets using 9.7 fb-1 of Run II Fermilab Tevatron Collider data collected with the D0 detector. The analysis is sensitive to Higgs boson production via gluon fusion, associated vector boson production, and vector boson fusion, followed by the Higgs boson decay to tau lepton pairs or to W boson pairs. The ratios of 95% C.L. upper limits on the cross section times branching ratio to those predicted by the standard model are obtained for orthogonal subsamples that are enriched in either H → [tau] [tau] decays or H → WW decays, and for the combination of these subsample limits. The observed and expected limit ratios for the combined subsamples at a Higgs boson mass of 125 GeV are 11.3 and 9.0 respectively.
Book Synopsis Higgs Production Via Gluon Fusion in Association with Two Or Three Jets in Supersymmetric Models by : Michael Kubocz
Download or read book Higgs Production Via Gluon Fusion in Association with Two Or Three Jets in Supersymmetric Models written by Michael Kubocz and published by . This book was released on 2009 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Phenomenological Studies of Minimal Extensions of Standard Model by : Nilanjana Kumar
Download or read book Phenomenological Studies of Minimal Extensions of Standard Model written by Nilanjana Kumar and published by . This book was released on 2016 with total page 169 pages. Available in PDF, EPUB and Kindle. Book excerpt: The ATLAS and CMS experiments at the Large Hadron Collider (LHC) have confirmed the existence of the Higgs boson, the last missing piece of the Standard Model, making this era a great time to look for beyond Standard Model physics, which can explain the deficiencies in the Standard Model. The research described here is highly motivated by supersymmetry, which appears as an extension of the Standard Model. The phenomenological consequences of that are of great importance and have been reflected in this research. In the first project, the prospects for LHC discovery of a narrow resonance that decays to two Higgs bosons using the bb[macron gammagamma] final state are studied. This study is inspired by the compressed Minimal Supersymmetric Standard Model, which allows the production of stoponium (a bound state of the supersymmetric partners of the top quark and its antiquark) and its decay to Higgs boson pairs, but this study is applicable to any other di-Higgs resonance produced by gluon fusion. The cross-section needed for a 5-sigma discovery at the 14 TeV LHC for such a narrow di-Higgs resonance is estimated as a function of the integrated luminosity, using the invariant mass distributions for bb [macron] and photons. I have also found the integrated luminosity required for discovery of stoponium as a function of its mass. In my second project a viable extension of the Standard Model which incorporates vectorlike fermions near the electroweak scale has been explored. Vectorlike quarks and leptons are exotic new fermions that transform in non-chiral representations of the unbroken Standard Model gauge group. Two models are considered, in which the vectorlike leptons are weak isosinglets and isodoublets. The vectorlike leptons decay to tau leptons. I have studied the prospects for excluding or discovering vectorlike leptons using multilepton events at the LHC. If the vectorlike leptons are weak isosinglets, then discovery in multilepton states is found to be extremely challenging. The prospects for exclusion or discovery of vectorlike leptons at the LHC with existing [radical square root of] s=8 TeV data and future [radical square root] s=13 TeV data are discussed. The study of the effective potential is a very important tool to explore any physics beyond Standard Model because it tells us about vacuum stability and the relation between the Higgs vacuum expectation value and other Lagrangian parameters. In the Standard Model the effective potential gets imaginary contributions when the squared mass of the Goldstone boson is negative, and it suffers from a singularity problem when the squared mass of the Goldstone boson tends to zero. It is possible to resum the SM effective potential to remove those problems associated with Goldstone boson contributions. In my last project I have shown that one can resum the effective potential in MSSM up to two-loop order to negate the spurious contributions from the Goldstone bosons.
Book Synopsis The Beauty and the Boost: A Higgs Boson Tale by : Brian Moser
Download or read book The Beauty and the Boost: A Higgs Boson Tale written by Brian Moser and published by Springer Nature. This book was released on 2023-09-19 with total page 250 pages. Available in PDF, EPUB and Kindle. Book excerpt: Precision measurements of the Higgs boson’s properties are a powerful tool to look for deviations from the predictions of the Standard Model (SM) of particle physics. The 139/fb of proton-proton collision data which have been collected by the ATLAS experiment during Run 2 of the LHC, offer an opportunity to investigate rare Higgs-boson topologies, which are particularly sensitive to new physics scenarios but experimentally difficult to access. Several such measurements, which target Higgs-boson decays to heavy-flavour quarks, as well as their combinations are presented in this thesis. A novel analysis that measures Higgs-boson production in association with a heavy vector boson V (VH, with V=W,Z) at high energies is presented. Dedicated Higgs-boson reconstruction techniques are applied to reconstruct the highly Lorentz-boosted Higgs-boson decays into pairs of bottom quarks. The measurement is subsequently combined with a VH cross-section measurement at low and intermediate pT(V) to provide a differential cross-section measurement in kinematic fiducial volumes over the largest possible pT(V) range. All cross-section measurements agree with the SM predictions within relative uncertainties that range from 30% to 300%. The results are furthermore interpreted as limits on the parameters of a SM effective field theory. Finally, a combination of measurements of Higgs decays to heavy-flavour quarks is used to experimentally determine that the Higgs-boson coupling to charm quarks is weaker than to bottom quarks, as predicted by the SM. The target audience for the thesis are physicists and physics students, in particular those with a background in high energy physics.
Book Synopsis Search for the Associated Production of a Higgs Boson with a Single Top Quark in Proton-proton Collisions at S by :
Download or read book Search for the Associated Production of a Higgs Boson with a Single Top Quark in Proton-proton Collisions at S written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is presented for the Higgs boson off-shell production in gluon fusion and vector boson fusion processes with the Higgs boson decaying into a WW pair and the W bosons decaying leptonically. The data observed in this analysis are used to constrain the Higgs boson total decay width. The analysis is based on the data collected by the CMS experiment at the LHC, corresponding to integrated luminosities of 4.9 inverse femtobarns at a centre-of-mass energy of 7 TeV and 19.4 inverse femtobarns at 8 TeV, respectively. An observed (expected) upper limit on the off-shell Higgs boson event yield normalised to the standard model prediction of 2.4 (6.2) is obtained at the 95% CL for the gluon fusion process and of 19.3 (34.4) for the vector boson fusion process. Observed and expected limits on the total width of 26 and 66 MeV are found, respectively, at the 95% confidence level (CL). These limits are combined with the previous result in the ZZ channel leading to observed and expected 95% CL upper limits on the width of 13 and 26 MeV, respectively.
Book Synopsis Search for the Standard Model Higgs Boson at D$\O$ in the Final State with Two $\tau$'s and Two Jets by :
Download or read book Search for the Standard Model Higgs Boson at D$\O$ in the Final State with Two $\tau$'s and Two Jets written by and published by . This book was released on 2011 with total page 133 pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model (SM) is a very successful description of particle physics, and its predictions have stood up to a multitude of precision experimental tests. But one of the central elements of the SM, the Higgs mechanism, has yet to be verified. The Higgs mechanism (and the associated Higgs Boson) generates electroweak symmetry breaking and consequently allows for W and Z bosons and fermions to be massive. This thesis presents a search for the SM Higgs boson at the D0 experiment using the Tevatron particle accelerator at Fermilab in the final state [tau][tau] + jet jet with 4.3 fb−1 of data. This final state is sensitive to the Higgs production mechanisms gluon-gluon fusion and vector-boson fusion, and to the Higgs produced in association with a W or Z, for Higgs masses from 100 to 200 GeV. We see no evidence for the Higgs boson, but by itself our search does not rule out the SM Higgs. When this analysis is combined with other searches at the Tevatron the Higgs can be ruled out at a 95% confidence level for the mass range from 156 to 177 GeV.
Book Synopsis Search for the Higgs Boson in the Vector Boson Fusion Channel at the ATLAS Detector by : Eric Ouellette
Download or read book Search for the Higgs Boson in the Vector Boson Fusion Channel at the ATLAS Detector written by Eric Ouellette and published by Springer. This book was released on 2015-01-20 with total page 114 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Thesis describes the first measurement of, and constraints on, Higgs boson production in the vector boson fusion mode, where the Higgs decays to b quarks (the most common decay channel), at the LHC. The vector boson fusion mode, in which the Higgs is produced simultaneously with a pair of quark jets, provides an unparalleled opportunity to study the detailed properties of the Higgs, including the possibility of parity and CP violation, as well as its couplings and mass. It thus opens up this new field of study for precision investigation as the LHC increases in energy and intensity, leading the way to this new and exciting arena of precision Higgs research.
Book Synopsis Measurements of Higgs Boson Production by Gluon−gluon Fusion and Vector-boson Fusion Using H->WW∗->e[nu][mu][nu]) Decays in Pp Collisions at [square Root]s by : ATLAS Collaboration CERN
Download or read book Measurements of Higgs Boson Production by Gluon−gluon Fusion and Vector-boson Fusion Using H->WW∗->e[nu][mu][nu]) Decays in Pp Collisions at [square Root]s written by ATLAS Collaboration CERN and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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