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Searches For Heavy Higgs Bosons In Two Higgs Doublet Models And For T2h Decay Using Multilepton And Diphoton Final States In Pp Collisions At 8 Tev
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Book Synopsis Searches for Heavy Higgs Bosons in Two-Higgs-doublet Models and for $t{u2192}ch$ Decay Using Multilepton and Diphoton Final States in $pp$ Collisions at 8 TeV. by :
Download or read book Searches for Heavy Higgs Bosons in Two-Higgs-doublet Models and for $t{u2192}ch$ Decay Using Multilepton and Diphoton Final States in $pp$ Collisions at 8 TeV. written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Searches are presented for heavy scalar (H) and pseudoscalar (A) Higgs bosons posited in the two doublet model (2HDM) extensions of the standard model (SM). These searches are based on a data sample of pp collisions collected with the CMS experiment at the LHC at a center-of-mass energy of √s=8 TeV and corresponding to an integrated luminosity of 19.5 fb-1. The decays H→hh and A→Zh, where h denotes an SM-like Higgs boson, lead to events with three or more isolated charged leptons or with a photon pair accompanied by one or more isolated leptons. Our search results are presented in terms of the H and A production cross sections times branching fractions and are further interpreted in terms of 2HDM parameters. We place 95% C.L. cross section upper limits of approximately 7 pb on ?B for H→hh and 2 pb for A→Zh. Furthermore, the results of a search for the rare decay of the top quark are presented; this results in a charm quark and an SM Higgs boson,t→ch, the existence of which would indicate a nonzero flavor-changing Yukawa coupling of the top quark to the Higgs boson. We place a 95% C.L. upper limit of 0.56% on B(t→ch).
Book Synopsis Searches for Heavy Higgs Bosons in Two-Higgs-doublet Models and for $t2!h$ Decay Using Multilepton and Diphoton Final States in $pp$ Collisions at 8 TeV. by :
Download or read book Searches for Heavy Higgs Bosons in Two-Higgs-doublet Models and for $t2!h$ Decay Using Multilepton and Diphoton Final States in $pp$ Collisions at 8 TeV. written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Searches are presented for heavy scalar (H) and pseudoscalar (A) Higgs bosons posited in the two doublet model (2HDM) extensions of the standard model (SM). These searches are based on a data sample of pp collisions collected with the CMS experiment at the LHC at a center-of-mass energy of √s=8 TeV and corresponding to an integrated luminosity of 19.5 fb-1. The decays H→hh and A→Zh, where h denotes an SM-like Higgs boson, lead to events with three or more isolated charged leptons or with a photon pair accompanied by one or more isolated leptons. Our search results are presented in terms of the H and A production cross sections times branching fractions and are further interpreted in terms of 2HDM parameters. We place 95% C.L. cross section upper limits of approximately 7 pb on [sigma]B for H→hh and 2 pb for A→Zh. Furthermore, the results of a search for the rare decay of the top quark are presented; this results in a charm quark and an SM Higgs boson,t→ch, the existence of which would indicate a nonzero flavor-changing Yukawa coupling of the top quark to the Higgs boson. We place a 95% C.L. upper limit of 0.56% on B(t→ch).
Book Synopsis Search for Higgs Bosons Predicted in Two-Higgs-doublet Models Via Decays to Tau Lepton Pairs in 1.96-TeV P Anti-p Collisions by :
Download or read book Search for Higgs Bosons Predicted in Two-Higgs-doublet Models Via Decays to Tau Lepton Pairs in 1.96-TeV P Anti-p Collisions written by and published by . This book was released on 2009 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present the results of a search for Higgs bosons predicted in two-Higgs-doublet models, in the case where the Higgs bosons decay to tau lepton pairs, using 1.8 fb−1 of integrated luminosity of p{bar p} collisions recorded by the CDF II experiment at the Fermilab Tevatron. Studying the mass distribution in events where one or both tau leptons decay leptonically, no evidence for a Higgs boson signal is observed. The result is used to infer exclusion limits in the two-dimensional space of tan [beta] versus m{sub A} (the ratio of the vaccum expectation values of the two Higgs doublets and the mass of the pseudoscalar boson, respectively).
Book Synopsis Search for New Light Higgs Bosons in Boosted Tau Final States with the CMS Experiment by : Francesca Shun-Ning Annarosa Ricci-Tam
Download or read book Search for New Light Higgs Bosons in Boosted Tau Final States with the CMS Experiment written by Francesca Shun-Ning Annarosa Ricci-Tam and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this dissertation, I present a search for non-standard decays of a Standard Model-like Higgs boson to pairs of light bosons, as predicted in models with extended Higgs sectors. In two Higgs doublet models, including the next-to-minimal supersymmetric standard model, the Higgs boson can decay into a pair of light pseudoscalars a. In this search, the gluon fusion, W and Z associated Higgs, and vector boson fusion production channels for the Higgs are all considered, and the decay H->aa with a->[tau][tau] is reconstructed from the tau decay products. The final state is characterized by one isolated high p[subscript]T muon plus at least one highly boosted pair of taus, of which one of the taus is required to decay to a muon.Using 19.7 fb−1 of 8 TeV center of mass pp collision data recorded by the Compact Muon Solenoid experiment at the Large Hadron Collider, a counting experiment is performed in a region of high di-tau invariant mass. We have found no excess of events above the Standard Model backgrounds, and the observed data is used to set upper limits on the branching ratio Br(H->aa)Br2(a->[tau][tau]). These results are equally applicable to decays of the SM-like Higgs boson to a pair of light scalars h.
Book Synopsis Searches for Beyond Standard Model Higgs Bosons in Pp Collisions at [square Root Of] S by : Pedro H. Sales de Bruin
Download or read book Searches for Beyond Standard Model Higgs Bosons in Pp Collisions at [square Root Of] S written by Pedro H. Sales de Bruin and published by . This book was released on 2016 with total page 143 pages. Available in PDF, EPUB and Kindle. Book excerpt: The searches for a Beyond Standard Model (BSM) heavy CP-odd Higgs boson A decaying to Zh in the context of two-Higgs-doublet models (2HDM), and Minimal Supersymmetric Standard Model (MSSM) neutral Higgs bosons H/A decaying to a tau pair are presented. The search for the heavy CP-odd Higgs boson, A, is conducted through the A -> Zh -> ll T[subscript]lep T[subscript]had decay channel using 20.3 fb−1 of proton-proton collision data collected by the ATLAS detector at a center-of-mass of 8 TeV. The search for the neutral MSSM H/A decaying to a tau pair in the T[subscript]lep T[subscript]had b-veto final state is done using 3.2 fb−1 of proton-proton collision data recorded by the ATLAS detector at a center-of-mass of 13 TeV. The observed data agrees with the Standard Model background prediction, and upper limits are set on cross-section times branching ratio of neutral BSM Higgs bosons.
Book Synopsis Searches for a Heavy Scalar Boson $ \mathrm{H} $ Decaying to a Pair of 125 GeV Higgs Bosons $ \mathrm{ Hh } $ Or for a Heavy Pseudoscalar Boson $ \mathrm{A} $ Decaying to $ \mathrm{Zh} $, in the Final States with $\mathrm{h} \to \tau \tau$ by :
Download or read book Searches for a Heavy Scalar Boson $ \mathrm{H} $ Decaying to a Pair of 125 GeV Higgs Bosons $ \mathrm{ Hh } $ Or for a Heavy Pseudoscalar Boson $ \mathrm{A} $ Decaying to $ \mathrm{Zh} $, in the Final States with $\mathrm{h} \to \tau \tau$ written by and published by . This book was released on 2015 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for a CP-odd Higgs Boson Decaying to Zh in Pp Collisions at {u221A}s by :
Download or read book Search for a CP-odd Higgs Boson Decaying to Zh in Pp Collisions at {u221A}s written by and published by . This book was released on 2015 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for a heavy, CP-odd Higgs boson, A, decaying into a Z boson and a 125 GeV Higgs boson, h, with the ATLAS detector at the LHC is presented. The search uses proton–proton collision data at a centre-of-mass energy of 8 TeV corresponding to an integrated luminosity of 20.3fb-1. Decays of CP-even h bosons to ?? or bb pairs with the Z boson decaying to electron or muon pairs are considered, as well as h → bb decays with the Z boson decaying to neutrinos. No evidence for the production of an A boson in these channels is found and the 95% confidence level upper limits derived for ?(gg → A) × BR(A → Zh) × BR(h → f¯f) are 0.098–0.013pb for f = ? and 0.57–0.014 pb for f = b in a range of mA=220–1000 GeV. The results are combined and interpreted in the context of two-Higgs-doublet models.
Book Synopsis Heavy Higgs Boson Search Via H->ZA->ZZh by : Zhangqier Wang
Download or read book Heavy Higgs Boson Search Via H->ZA->ZZh written by Zhangqier Wang and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The discovery of a 125GeV Higgs boson at the Large Hadron Collider strongly motivates direct searches for additional Higgs bosons. This thesis describes a search for additional Higgs bosons via Higgs cascade production gg -> H-> ZA ->ZZh, including my phenomenology work as well as the experimental result using proton-protoncollision data collected at [square root s] = 13 TeV with the CMS experiment at the CERN LHC. In type I two Higgs doublet models there is a large region of parameter space at tan [beta] [greater than or similar to] 5 that is currently unconstrained experimentally. The phenomenology shows that the process gg -> H-> ZA ->ZZh can be sensitive in this region,and can be the discovery mode for an extended Higgs sector at the LHC. There are totally 9 promising decay modes for the ZZh state, and the most sensitive final states are [ell][ell][ell][ell]bb, [ell][ell]jjbb, [ell][ell][nu][nu][gamma][gamma] and [ell][ell][ell][ell] + missing energy. The result is presented in terms of 14 TeV projection with integrated luminosity of 300 fb−1 and 3000 fb−1 . The experimental analysis considers the four-lepton and two b-tagged jets final state, resulting from leptonic decays of the two Z bosons and decay of the Higgs bosons to b-quarks, which was found to be the mostsensitive channel in the phenomenological study. The data used in the analysis was collected by the CMS experiment from 35.9 fb−1 of proton-proton collisions at [squareroot s] =13 TeV produced at the Large Hadron Collider in 2016. Upper limits at 95% confidence level are obtained on the cross section of ZZh production in Type I 2HDM scenarios. The cascade decay channel considered in this analysis adds unique sensitivity to some regions of the parameter space within the two-Higgs-doublet-model.
Book Synopsis Search for Heavy Resonances Decaying to Two Higgs Bosons in Final States Containing Four B Quarks by :
Download or read book Search for Heavy Resonances Decaying to Two Higgs Bosons in Final States Containing Four B Quarks 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 narrow heavy resonances X decaying into pairs of Higgs bosons (H) in proton-proton collisions collected by the CMS experiment at the LHC at sqrt(s)=8 TeV. The data correspond to an integrated luminosity of 19.7 inverse femtobarns. The search considers HH resonances with masses between 1 and 3 TeV, having final states of two b quark pairs. Each Higgs boson is produced with large momentum, and the hadronization products of the pair of b quarks can usually be reconstructed as single large jets. The background from multijet and t-tbar events is significantly reduced by applying requirements related to the flavor of the jet, its mass, and its substructure. The signal would be identified as a peak on top of the dijet invariant mass spectrum of the remaining background events. No evidence is observed for such a signal. Upper limits obtained at 95% confidence level for the product of the production cross section and branching fraction sigma(gg to X) B(X to HH to b-bbar b-bbar) range from 10 to 1.5 fb for the mass of X from 1.15 to 2.0 TeV, significantly extending previous searches. For a warped extra dimension theory with a mass scale Lambda[R] = 1 TeV, the data exclude radion scalar masses between 1.15 and 1.55 TeV.
Book Synopsis Search for Light Bosons in Decays of the 125 GeV Higgs Boson in Proton-proton Collisions at Sqrt(s) by :
Download or read book Search for Light Bosons in Decays of the 125 GeV Higgs Boson in Proton-proton Collisions at Sqrt(s) written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is presented for decays beyond the standard model of the 125 GeV Higgs bosons to a pair of light bosons, based on models with extended scalar sectors. Light boson masses between 5 and 62.5 GeV are probed in final states containing four tau leptons, two muons and two b quarks, or two muons and two tau leptons. The results are from data in proton-proton collisions corresponding to an integrated luminosity of 19.7 inverse-femtobarns, accumulated by the CMS experiment at the LHC at a center-of-mass energy of 8 TeV. No evidence for such exotic decays is found in the data. Upper limits are set on the product of the cross section and branching fraction for several signal processes. The results are also compared to predictions of two-Higgs-doublet models, including those with an additional scalar singlet.
Book Synopsis Search for Two Higgs Bosons in Final States Containing Two Photons and Two Bottom Quarks by :
Download or read book Search for Two Higgs Bosons in Final States Containing Two Photons and Two Bottom Quarks 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 production of two Higgs bosons in final states containing two photons and two bottom quarks. Both resonant and nonresonant hypotheses are investigated. The analyzed data correspond to an integrated luminosity of 19.7 inverse femtobarns of proton-proton collisions at sqrt(s) = 8 TeV collected with the CMS detector. Good agreement is observed between data and predictions of the standard model (SM). Upper limits are set at 95% confidence level on the production cross section of new particles and compared to the prediction for the existence of a warped extra dimension. When the decay to two Higgs bosons is kinematically allowed, assuming a mass scale LambdaR = 1 TeV for the model, the data exclude a radion scalar at masses below 980 GeV. The first Kaluza-Klein excitation mode of the graviton in Randall-Sundrum models is excluded for masses between 325 and 450 GeV. Limits set on nonresonant production constrain the parameter space for anomalous Higgs boson couplings.
Book Synopsis Search for Higgs Bosons Decaying to Aa in the [mu][mu][tau][tau] Final State in Pp Collisions at [arrow]" by :
Download or read book Search for Higgs Bosons Decaying to Aa in the [mu][mu][tau][tau] Final State in Pp Collisions at [arrow]" written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the decay to a pair of new particles of either the 125 GeV Higgs boson (h) or a second charge parity (CP)-even Higgs boson (H) is presented. The data set corresponds to an integrated luminosity of 20.3 fb-1 of pp collisions at [arrow]" = 8 TeV recorded by the ATLAS experiment at the LHC in 2012. The search was done in the context of the next-to-minimal supersymmetric standard model, in which the new particles are the lightest neutral pseudoscalar Higgs bosons (a). One of the two a bosons is required to decay to two muons while the other is required to decay to two [tau] leptons. No significant excess is observed above the expected backgrounds in the dimuon invariant mass range from 3.7 to 50 GeV. Upper limits are placed on the production of h 2!aa relative to the standard model gg 2!h production, assuming no coupling of the a boson to quarks. The most stringent limit is placed at 3.5% for ma = 3.75 GeV. Upper limits are also placed on the production cross section of H 2!aa from 2.33 to 0.72 pb, for fixed ma = 5 GeV with mH ranging from 100 to 500 GeV.
Book Synopsis Search for a Low-mass Pseudoscalar Higgs Boson Produced in Association with a $b\bar{b}$ Pair in Pp Collisions at {u221A}s by :
Download or read book Search for a Low-mass Pseudoscalar Higgs Boson Produced in Association with a $b\bar{b}$ Pair in Pp Collisions at {u221A}s written by and published by . This book was released on 2016 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is reported for a light pseudoscalar Higgs boson decaying to a pair of ? leptons, produced in association with a $b\bar{b}$ pair, in the context of two-Higgs-doublet models. The results are based on pp collision data at a centre-of-mass energy of 8 TeV collected by the CMS experiment at the LHC and corresponding to an integrated luminosity of 19.7 fb-1. Pseudoscalar boson masses between 25 and 80 GeV are probed. There was no evidence for a pseudoscalar boson found and upper limits were set on the production cross section times branching fraction to t pairs between 7 and 39 pb at the 95% confidence level. This search excludes a pseudoscalar Higgs boson with mass below 80 GeV, in Type II two-Higgs-doublet models with a negative coupling of standard model-like Higgs boson to down-type fermions.
Book Synopsis Search for Two Higgs Bosons in Final States Containing Two Photons and Two Bottom Quarks in Proton-proton Collisions at 8 TeV by : CMS Collaboration
Download or read book Search for Two Higgs Bosons in Final States Containing Two Photons and Two Bottom Quarks in Proton-proton Collisions at 8 TeV written by CMS Collaboration and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Search for Charged Higgs Boson Decays of the Top Quark Using Hadronic Decays of the Tau Lepton in Proton-antiproton Collisions at Square Root S by :
Download or read book A Search for Charged Higgs Boson Decays of the Top Quark Using Hadronic Decays of the Tau Lepton in Proton-antiproton Collisions at Square Root S written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The Standard Model predicts the existence of one neutral scalar Higgs boson, which is a remnant of the mechanism that breaks the SU(2)[sub L]xU(1)[sub Y] electroweak symmetry and generates masses for the heavy vector bosons and fermions. Many extensions to the Standard Model predict two or more Higgs doublets, resulting in a larger spectrum of Higgs bosons including a charged Higgs boson (H[sup [+-]]). For a light charged Higgs boson mass, the top decay into a charged Higgs boson and bottom quark might occur. This thesis presents results of a direct search for this top quark decay mode via the charged Higgs decay to a tau lepton and tau-neutrino, using the hadronic decays of the tau leptons. The search data consist of 100 pb[sup -1] of Run 1 data collected between 1992-1995 at the CDF detector, from p[anti p] collisions at a center-of-mass energy of 1.8 TeV produced at Fermilab's Tevatron accelerator. A total of seven events are observed in two search channels with an expected background contribution of 7.4[+-]2.0 events coming from fake taus (5.4[+-]1.5), heavy vector boson decays with jets (1.9[+-]1.3) and dibosons(0.08[+-]0.06). Lacking evidence for a signal, we set limits on charged Higgs production at the 95% confidence level in the charged Higgs mass plane versus tan[beta](a parameter of the theory) for a top quark mass of 175 GeV/c[sup 2] and for top production cross sections ([sigma][sub t[anti t]]) of 5.0 and 7.5 pb, assuming the Type-II Two-Higgs-Doublet-Model. For large tan[beta], this analysis excludes a charged Higgs boson of mass below 147(158)GeV/c[sup 2] for [sigma][sub t[anti t]]=5.0(7.5)pb. Using the Standard Model measured top quark cross section from CDF, this limit increases to 168 GeV/c[sup 2] and we also exclude a branching fraction of top decays via this charged Higgs mode of greater than 43% for charged Higgs masses below 168 GeV/c[sup 2].
Book Synopsis Search and Discovery with the Resonant [diphoton] Final State at ATLAS by : Andrew Straiton Hard
Download or read book Search and Discovery with the Resonant [diphoton] Final State at ATLAS written by Andrew Straiton Hard and published by . This book was released on 2016 with total page 159 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the Standard Model Higgs boson was conducted with the ATLAS Experiment at the LHC using the two-photon decay channel. Datasets with integrated luminosities of 4.8 inverse femtobarns and 5.9 inverse femtobarns were collected in 2011 and 2012 for proton-proton collisions with center-of-mass energies of 7 TeV and 8 TeV, respectively. A statistically significant excess of events above the background-only expectation in the [diphoton] decay channel of 4.5 standard deviations was observed. Combined with excesses in the WW and ZZ decays, this observation led to the discovery of a Higgs boson with a significance of 5.9 standard deviations at a mass of 126.0 +/- 0.4 (stat) +/- 0.4 (sys) GeV. Searches for diphoton resonances during 2015 and 2016 with LHC data were motivated by extensions to the Standard Model that predict additional scalar particles. Data were analyzed from 13 TeV proton-proton collisions, corresponding to an integrated luminosity of 15.4 inverse femtobarns, and no significant deviations from the Standard Model hypothesis were observed. 95% CL limits on the production cross-section times branching ratio to [diphotons] were calculated for scalar models with masses between 200 GeV and 2.4 TeV and widths ranging from 4 MeV to 10% of the scalar mass.
Book Synopsis Search for a Higgs Boson in the Decay Channel $H$ to ZZ(*) to $q$ Qbar $\ell-̂$ L+ in $pp$ Collisions at $\sqrt{s} by :
Download or read book Search for a Higgs Boson in the Decay Channel $H$ to ZZ(*) to $q$ Qbar $\ell-̂$ L+ in $pp$ Collisions at $\sqrt{s} written by and published by . This book was released on 2012 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for the standard model Higgs boson decaying into two Z bosons with subsequent decay into a final state containing two quark jets and two leptons, H to ZZ(*) to q q-bar l-l+ is presented. Results are based on data corresponding to an integrated luminosity of 4.6 inverse femtobarns of proton-proton collisions at sqrt(s)=7 TeV, collected with the CMS detector at the LHC. In order to discriminate between signal and background events, kinematic and topological quantities, including the angular spin correlations of the decay products, are employed. Events are further classified according to the probability of the jets to originate from quarks of light or heavy flavor or from gluons. No evidence for the Higgs boson is found, and upper limits on its production cross section are determined for a Higgs boson of mass between 130 and 600 GeV.
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