Search for Dark Matter Recoiling from a Higgs Boson, which Decays to Tau Lepton Pairs, with the CMS Detector at the LHC PDF Download
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Author: Jithin Madhusudanan Sreekala Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This thesis describes search for dark matter particles recoiling from a Higgs boson at the CMS detector at the LHC where the Higgs subsequently decays to two tau leptons. The analysis uses 2017 and 2018 RUN II dataset collected by CMS experiment. This thesis discusses two scenarios, one where taus are resolved and one where taus are boosted.
Author: Jithin Madhusudanan Sreekala Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This thesis describes search for dark matter particles recoiling from a Higgs boson at the CMS detector at the LHC where the Higgs subsequently decays to two tau leptons. The analysis uses 2017 and 2018 RUN II dataset collected by CMS experiment. This thesis discusses two scenarios, one where taus are resolved and one where taus are boosted.
Author: Laura Margaret Dodd Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
A search for the standard model (SM) Higgs boson which decays to a pair of [tau] leptons is presented in this thesis using 35.9 f b−1 of 13 TeV data collected in 2016 by the CMS detector at CERN. The final states considered require that (1) one [tau] lepton decays leptonically while the other decays hadronically ([mu][tau]h or e[tau]h), (2) both taus decay hadronically ([tau]h[tau]h) or (3) one tau lepton decays to an electron while the other decays to a muon (e[mu]). This thesis specifically focuses on the details of the semi-hadronic decay channels ([mu][tau]h and e[tau]h), and presents the results of all channels combined. The signal strength, [mu], relative to the expectation for the SM Higgs boson is measured to be [mu] = 1.09+0.27−0.24. An excess is observed (expected) corresponding to 4.9 (4.7) [sigma] using 2016 data. The observed (expected) significance reaches 5.9 (5.9) [sigma] when combined with 7 and 8 TeV data collected at CMS. Subsequently following the SM search, a search for dark matter (DM) is presented and interpreted in two simplified Higgs-portal models: a baryonic dark matter model and a two Higgs-doublet model. In this thesis, the Higgs boson is required to decay to an opposite- sign tau pair. The tau pair final states considered are e[tau]h, [mu][tau]h, and [tau]h[tau]h. The expected 95% confidence level upper limits are produced and compared with the observed limit. No significant deviations beyond the SM prediction are observed.
Author: Garrett Ned Funk Publisher: ISBN: 9780438629912 Category : Languages : en Pages :
Book Description
A search for dark matter is performed using the proton-proton collision dataset recorded by the CMS detector at the CERN LHC during the data-taking period of 2016. The dataset corresponds to an integrated luminosity of 35.9 fb−1 of proton-proton collisions at 13 TeV. The search is performed for two theory models, both of which incorporate the standard model Higgs boson into dark matter production. The signature in both theory models is a standard model Higgs boson plus missing momentum from the dark matter, which does not interact with the CMS detector. This signature is dubbed 'mono-Higgs'. The first theory model uses an additional set of Higgs sector parameters and incorporates a new mediator particle and a pseudoscalar Higgs boson into dark matter production. The second model introduces a new mediator that carries baryon number symmetry. The analysis presented in this thesis is specifically focused on the final state with a standard model Higgs boson decay to [tau] leptons. A range of parameter space is excluded with 95% confidence for both models, and an advanced technique is used to extend the exclusion for a particular range of one model. In the first model, mediator masses between 700 and 1200 GeV are excluded for a pseudoscalar mass of 300 GeV and a dark matter mass of 100 GeV. In the second model, mediator masses up to 500 GeV are excluded for a dark matter mass of 1 GeV.
Author: Dustin Ray Burns Publisher: ISBN: 9780355151343 Category : Languages : en Pages :
Book Description
The study presented in this dissertation is a search for dark matter produced in 13 TeV proton-proton collisions at the Large Hadron Collider (LHC) using 35.9 fb−1 of data collected in 2016 with the Compact Muon Solenoid (CMS) detector. Dark matter escapes the detector without interacting, resulting in a large imbalance of transverse momentum, which can be observed when a Higgs boson is tagged in the opposite direction. A variety of models which motivate a dark matter and Higgs interaction are discussed. The experimental signature of these models is called mono-Higgs. In this search, the Higgs is produced primarily from gluon fusion and decays to four leptons via two Z bosons (H → ZZ → 4l). In addition to observing the Higgs in the four-lepton final state, an extensive study of missing transverse energy (MET) is required to search for the mono-Higgs signature. A background model is developed for the Standard Model processes that result in the same final state as the signal, then a counting experiment is performed in an optimized signal region. There is no evidence for an excess of events in the signal region above the backgrounds, so cross section limits are set for two kinematically distinct signal models.
Author: Valentina Dutta Publisher: ISBN: Category : Languages : en Pages : 185
Book Description
In this thesis, I describe the search for a Higgs boson through its decay to a pair of tan leptons with the tau-pair subsequently decaying to ail electron, a muon, and neutrinos. The search is performed using data collected from proton-proton collisions by the Compact Muon Solenoid experiment at the Large Hadron Collider, corresponding to 5.0 fb-1 of integrated luminosity recorded at a center-of-mass energy of 7 TeV and 19.7 fb-1 at 8 TeV. The expected significance for a Standard Model Higgs boson signal with a mass of 125 GeV is at the level of 1.2 standard deviations for the electron muon tau-pair decay mode. A mild excess of events is seen above the SM background expectation in this decay mode, consistent with a SM Higgs boson of mass 125 GeV. In combination with results using other tau-pair decay modes, an excess of events above the background expectation is seen at the level of 3.4 standard deviations. This constitutes the first evidence for a Higgs boson to decay to leptons. This thesis also describes an analysis of the data in the context of physics beyond the Standard Model, particularly in the framework of its Minimal Supersymnnetric extension.
Author: Publisher: ISBN: Category : Languages : en Pages : 109
Book Description
This thesis presents the first direct search for lepton flavor violating decays of the recently discovered Higgs boson. The search is performed in the $H \rightarrow \mu \tau_{e}$ and $H \rightarrow \mu \tau_{h}$ decay channels, where $\tau_{e}$ and $\tau_{h}$ denote the electronic and hadronic tau decay channels respectively. The search is performed using the proton-proton collisions data gathered at the Compact Muon Solenoid detector at the Large Hadron Collider. The search uses 19.7 fb$^{-1}$ of $\sqrt{s}$ = 8 TeV data taken in 2012 as well as 2.3 fb$^{-1}$ of $\sqrt{s}$ = 13 TeV data taken in 2015. The limits on the branching fraction $B(H\rightarrow \mu\tau)$ are measured, and the existing limits from indirect searches are reduced by an order of magnitude. This thesis also presents a measurement of the differential cross section of a W boson produced in associated with jets. This measurement was performed with 2.5 fb$^{-1}$ of $\sqrt{s}$ = 13 TeV proton-proton collision data produced by the Large Hadron Collider in 2015 and recorded at the Compact Muon Solenoid detector. Cross sections are computed as a function of jet multiplicity, and the results are compared to theoretical predictions from leading order and next-to-leading order Monte Carlo generators.
Author: Aaron Goodman Levine Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This thesis presents the first direct search for lepton flavor violating decays of the recently discovered Higgs boson. The search is performed in the $H \rightarrow \mu \tau_{e}$ and $H \rightarrow \mu \tau_{h}$ decay channels, where $\tau_{e}$ and $\tau_{h}$ denote the electronic and hadronic tau decay channels respectively. The search is performed using the proton-proton collisions data gathered at the Compact Muon Solenoid detector at the Large Hadron Collider. The search uses 19.7 fb$^{-1}$ of $\sqrt{s}$ = 8 TeV data taken in 2012 as well as 2.3 fb$^{-1}$ of $\sqrt{s}$ = 13 TeV data taken in 2015. The limits on the branching fraction $B(H\rightarrow \mu\tau)$ are measured, and the existing limits from indirect searches are reduced by an order of magnitude. This thesis also presents a measurement of the differential cross section of a W boson produced in associated with jets. This measurement was performed with 2.5 fb$^{-1}$ of $\sqrt{s}$ = 13 TeV proton-proton collision data produced by the Large Hadron Collider in 2015 and recorded at the Compact Muon Solenoid detector. Cross sections are computed as a function of jet multiplicity, and the results are compared to theoretical predictions from leading order and next-to-leading order Monte Carlo generators.
Author: Publisher: ISBN: Category : Languages : en Pages :
Book Description
A search for dark matter is performed using events with large missing transverse momentum and a Higgs boson decaying either to a pair of bottom quarks or to a pair of photons. The data from proton-proton collisions at a center-of-mass energy of 13 TeV, collected with the CMS detector at the LHC, correspond to an integrated luminosity of 2.3 inverse-femtobarns. Results are interpreted in the context of a Z'-two-Higgs-doublet model, where a high-mass resonance Z' decays into a pseudoscalar boson A and a CP-even scalar Higgs boson, and the A decays to a pair of dark matter particles. No significant excesses are observed over the background prediction. Combining results from the two decay channels yields exclusion limits in the signal cross section in the m[Z']-m[A] phase space. The observed data exclude, for Z' coupling strength g[Z'] = 0.8 and m[A] = 300 GeV for example, the Z' mass range of 600 to 1860 GeV. This is the first result on a search for dark matter produced in association with a Higgs boson that includes constraints on h to gamma-gamma obtained at sqrt(s) = 13 TeV.
Author: Tyler Henry Ruggles Publisher: ISBN: Category : Languages : en Pages : 0
Book Description
This thesis presents a 5.5 standard deviation observation of the Higgs boson decaying to fermions using the data collected at the LHC at 13 TeV center-of-mass energy. The studied dataset corresponds to an integrated luminosity of 35.9 inverse femtobarns. The best fit signal strength for the H to tau tau process is measured to be mu = 1.24 ^{+0.29}/{-0.27}, consistent with standard model predictions. Unique event categories are used targeting the leading Higgs boson production processes, gluon fusion, vector boson fusion, and associated production. This provides signal regions sensitive to Higgs boson couplings to both fermions and vector bosons. These two Higgs boson couplings are measured and are consistent with standard model predictions within one standard deviation. This 5.5 standard deviation observation of the H to tau tau process and the consistency of the Higgs boson couplings with the standard model provide confirmation of the Higgs boson Yukawa couplings to fermions. This is evidence that the Higgs field provides mass for the tau lepton in addition to the vector bosons.
Author: Jithin Madhusudanan Sreekala
Author: Jithin Madhusudanan Sreekala
Author: Laura Margaret Dodd![Search for Mono-Higgs-Boson to [tau] Pairs at the LHC with [squareroot]s PDF](https://books.google.com/books/content/images/frontcover/HQkmxQEACAAJ?fife=w80-h100)
Author: Garrett Ned Funk
Author: Dustin Ray Burns
Author: Valentina Dutta
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Author: Aaron Goodman Levine
Author: 
Author: Tyler Henry Ruggles
Author: Arthur Linß