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Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Presented here is an analysis of the spin and parity of the Higgs-like boson near 126 GeV in the ZZ decay channel where the Z bosons decay into two muons or electrons. The analysis utilizes 19.7 fb-1 of 8 TeV proton-proton collision data recorded by the CMS experiment. The Standard Model pure-scalar hypothesis is compared against four alternate spin-parity hypotheses utilizing an angles-only technique. The data are consistent with the Standard Model expectations, and the pseudoscalar hypothesis is excluded at the 95% confidence level. Additionally, we present a search for a doubly charged Higgs boson, which also utilizes 19.7 fb-1 of 8 TeV proton-proton collision data recorded by CMS. The doubly charged Higgs is a member of an SU(2)L scalar triplet, and is a Type II "seesaw" mechanism. We search for a four-lepton final state from Drell-Yan pair production of two left-handed doubly charged Higgs bosons. The branching ratio of the doubly charged Higgs is not determined by the model, so we consider a variety of possible branching ratio scenarios. No excess is observed compared to the background prediction. Lower limits on the doubly charged Higgs mass range from 388 to 585 GeV at the 95% confidence level, depending on the branching ratio scenario
Author: Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
Presented here is an analysis of the spin and parity of the Higgs-like boson near 126 GeV in the ZZ decay channel where the Z bosons decay into two muons or electrons. The analysis utilizes 19.7 fb-1 of 8 TeV proton-proton collision data recorded by the CMS experiment. The Standard Model pure-scalar hypothesis is compared against four alternate spin-parity hypotheses utilizing an angles-only technique. The data are consistent with the Standard Model expectations, and the pseudoscalar hypothesis is excluded at the 95% confidence level. Additionally, we present a search for a doubly charged Higgs boson, which also utilizes 19.7 fb-1 of 8 TeV proton-proton collision data recorded by CMS. The doubly charged Higgs is a member of an SU(2)L scalar triplet, and is a Type II "seesaw" mechanism. We search for a four-lepton final state from Drell-Yan pair production of two left-handed doubly charged Higgs bosons. The branching ratio of the doubly charged Higgs is not determined by the model, so we consider a variety of possible branching ratio scenarios. No excess is observed compared to the background prediction. Lower limits on the doubly charged Higgs mass range from 388 to 585 GeV at the 95% confidence level, depending on the branching ratio scenario
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Research of the spin and parity quantum numbers of the Higgs boson in the WW* → e[nu][mu][nu] final state are presented, based on proton-proton collision data collected by the ATLAS detector at the Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb-1 at a centre-of-mass energy of √s=8 TeV. The Standard Model spin-parity JCP=0++ hypothesis is compared with alternative hypotheses for both spin and CP. The case where the observed resonance is a mixture of the Standard-Model-like Higgs boson and CP-even (JCP=0++) or CP-odd (JCP=0+-) Higgs boson in scenarios beyond the Standard Model is also studied. The data are found to be consistent with the Standard Model prediction and limits are placed on alternative spin and CP hypotheses, including CP mixing in different scenarios.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Studies of the spin, parity and tensor couplings of the Higgs boson in the H→ZZ*→4l, H→WW*→e[nu][mu][nu] and H→[gamma][gamma] decay processes at the LHC are presented. The investigations are based on 25fb-1 of pp collision data collected by the ATLAS experiment at √s=7 TeV and √s=8 TeV. The Standard Model (SM) Higgs boson hypothesis, corresponding to the quantum numbers JP=0+, is tested against several alternative spin scenarios, including non-SM spin-0 and spin-2 models with universal and non-universal couplings to fermions and vector bosons. All tested alternative models are excluded in favour of the SM Higgs boson hypothesis at more than 99.9 % confidence level. Using the H→ZZ*→4l and H→WW*→e[nu][mu][nu] decays, the tensor structure of the interaction between the spin-0 boson and the SM vector bosons is also investigated. The observed distributions of variables sensitive to the non SM tensor couplings are compatible with the SM predictions and constraints on the non SM couplings are derived.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
Our study of the spin-parity and tensor structure of the interactions of the recently discovered Higgs boson is performed using the H→ZZ,Z?*,?*?*→4l, H→WW→l?l?, and H→?? decay modes. The full data set recorded by the CMS experiment during the LHC run 1 is used, corresponding to an integrated luminosity of up to 5.1 fb-1 at a center-of-mass energy of 7 TeV and up to 19.7 fb-1 at 8 TeV. A wide range of spin-two models is excluded at a 99% confidence level or higher, or at a 99.87% confidence level for the minimal gravitylike couplings, regardless of whether assumptions are made on the production mechanism. Any mixed-parity spin-one state is excluded in the ZZ and WW modes at a greater than 99.999% confidence level. Under the hypothesis that the resonance is a spin-zero boson, the tensor structure of the interactions of the Higgs boson with two vector bosons ZZ, Z?, ??, and WW is investigated and limits on eleven anomalous contributions are set. Furthermore, the tighter constraints on anomalous HVV interactions are obtained by combining the HZZand HWW measurements. All observations are consistent with the expectations for the standard model Higgs boson with the quantum numbers JPC=0++.
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Author: ![Determination of Spin and Parity of the Higgs Boson in the WW* 2!e [nu] [mu] [nu] Decay Channel with the ATLAS Detector PDF](https://books.google.com/books/content/images/frontcover/hkIsvwEACAAJ?fife=w80-h100)
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