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Search For Resonances Decaying To A Pair Of Higgs Bosons In The Bbqql Final State In Proton Proton Collisions At S
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Book Synopsis Search for Resonances Decaying to a Pair of Higgs Bosons in the Bb̄qq̄′lν Final State in Proton-proton Collisions at √s by : Albert M. Sirunyan
Download or read book Search for Resonances Decaying to a Pair of Higgs Bosons in the Bb̄qq̄′lν Final State in Proton-proton Collisions at √s written by Albert M. Sirunyan and published by . This book was released on 2019 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for a Massive Resonance Decaying to a Pair of Higgs Bosons in the Four B Quark Final State in Proton-proton Collisions at √s by :
Download or read book Search for a Massive Resonance Decaying to a Pair of Higgs Bosons in the Four B Quark Final State in Proton-proton Collisions at √s written by and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for a Massive Resonance Decaying Into a Higgs Boson and a W Or Z Boson in Hadronic Final States in Proton-proton Collisions at {u221A}s by :
Download or read book Search for a Massive Resonance Decaying Into a Higgs Boson and a W Or Z Boson in Hadronic Final States in Proton-proton Collisions at {u221A}s written by and published by . This book was released on 2015 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for a massive resonance decaying into a standard-model-like Higgs boson (H) and a W or Z boson is reported. The analysis is performed on a data sample corresponding to an integrated luminosity of 19.7 fb–1, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. Signal events, in which the decay products of Higgs, W, or Z bosons at high Lorentz boost are contained within single reconstructed jets, are identified using jet substructure techniques, including the tagging of b hadrons. This is the first search for heavy resonances decaying in HW or HZ resulting in an all-jet final state, as well as the first application of jet substructure techniques to identify H → WW* → 4q decays at high Lorentz boost. Furthermore, no significant signal is observed and limits are set at 95% confidence level on the production cross section of W' and Z' in a model with mass-degenerate charged and neutral spin-1 resonances.
Book Synopsis A Search for Heavy Resonances Decaying to a Pair of Higgs Bosons with Leptons and a Bottom Quark Pair in the Final State by : Brent Stone
Download or read book A Search for Heavy Resonances Decaying to a Pair of Higgs Bosons with Leptons and a Bottom Quark Pair in the Final State written by Brent Stone and published by . This book was released on 2021 with total page 220 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a search for new heavy resonances decaying to a pair of Higgs bosons in proton-proton collisions at a center-of-mass energy of 13 TeV. The data were collected with the CMS detector at the LHC in 2016--2018, corresponding to an integrated luminosity of 138 $\mathrm{fb}^{-1}$. Resonances with a mass between 0.8 and 4.5 TeV are considered using events in which one Higgs boson decays into a bottom quark pair and the other into final states with either one or two charged leptons. Specifically, the single-lepton decay channel $\mathrm{HH} \to \mathrm{b}\bar{\mathrm{b}} \mathrm{WW}^* \to \mathrm{b}\bar{\mathrm{b}} \ell \nu \mathrm{q}\bar{\mathrm{q}}$ and the dilepton decay channels $\mathrm{HH} \to \mathrm{b}\bar{\mathrm{b}} \mathrm{WW}^* \to \mathrm{b}\bar{\mathrm{b}} \ell \nu \ell \nu$ and $\mathrm{HH} \to \mathrm{b}\bar{\mathrm{b}} \tau\tau \to \mathrm{b}\bar{\mathrm{b}} \ell \nu \nu \ell \nu \nu$ are examined. The signal is extracted using a two-dimensional maximum likelihood fit of the $\mathrm{H}\to\mathrm{b}\bar{\mathrm{b}}$ jet mass and HH invariant mass distributions. No significant excess above the standard model expectation is observed in data. Model-independent exclusion limits are placed on the product of the cross section and branching fraction for narrow spin-0 and spin-2 massive bosons decaying to HH. The results provide the most stringent limits to date for $\mathrm{X}\to\mathrm{HH}$ signatures with final-state leptons and at some masses provide the most sensitive limits of all $\mathrm{X}\to\mathrm{HH}$ searches.
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 A Massive Resonance Decaying Into a Higgs Boson and a W Or Z Boson in Hadronic Final States in Proton-Proton Collisions at $\sqrt{s}$ by :
Download or read book Search for A Massive Resonance Decaying Into a Higgs Boson and a W Or Z Boson in Hadronic Final States in Proton-Proton Collisions at $\sqrt{s}$ written by and published by . This book was released on 2015 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for a massive resonance decaying into a standard-model-like Higgs boson (H) and a W or Z boson is reported. The analysis is performed on a data sample corresponding to an integrated luminosity of 19.7 fb-1, collected in proton-proton collisions at a centre-of-mass energy of 8 TeV with the CMS detector at the LHC. Signal events, in which the decay products of Higgs, W, or Z bosons at high Lorentz boost are contained within single reconstructed jets, are identified using jet substructure techniques, including the tagging of b hadrons. This is the first search for heavy resonances decaying in HW or HZ resulting in an all-jet final state, as well as the first application of jet substructure techniques to identify H → WW* → 4q decays at high Lorentz boost. Furthermore, no significant signal is observed and limits are set at 95% confidence level on the production cross section of W' and Z' in a model with mass-degenerate charged and neutral spin-1 resonances.
Book Synopsis Search for Massive WH Resonances Decaying Into the $\ell \nu \mathrm{b} \overline{\mathrm{b}} $ Final State at $\sqrt{s} by :
Download or read book Search for Massive WH Resonances Decaying Into the $\ell \nu \mathrm{b} \overline{\mathrm{b}} $ Final State at $\sqrt{s} written by and published by . This book was released on 2016 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, a search for a massive resonance ${\mathrm{W}^{\prime }}$ decaying into a W and a Higgs boson in the $\ell \nu \mathrm{b} \overline{\mathrm{b}} $ ($\ell = \mathrm {e}$, $\mu $) final state is presented. Results are based on data corresponding to an integrated luminosity of 19.7 $\, \text {fb}^{{-1}}$ of proton-proton collisions at $\sqrt{s}=8$ $~\text {TeV}$, collected using the CMS detector at the LHC. For a high-mass ($\gtrsim $ 1 $~\text {TeV}$) resonance, the two bottom quarks coming from the Higgs boson decay are reconstructed as a single jet, which can be tagged by placing requirements on its substructure and flavour. Exclusion limits at 95 % confidence level are set on the production cross section of a narrow resonance decaying into WH, as a function of its mass. In the context of a little Higgs model, a lower limit on the ${\mathrm{W}^{\prime }}$ mass of 1.4 $~\text {TeV}$ is set. In a heavy vector triplet model that mimics the properties of composite Higgs models, a lower limit on the ${\mathrm{W}^{\prime }}$ mass of 1.5 $~\text {TeV}$ is set. In the context of this model, the results are combined with related searches to obtain a lower limit on the ${\mathrm{W}^{\prime }}$ mass of 1.8 $~\text {TeV}$, the most restrictive to date for decays to a pair of standard model bosons.
Book Synopsis Search for Resonant Pair Production of Higgs Bosons Decaying to Two Bottom Quark{u2013}antiquark Pairs in Proton{u2013}proton Collisions at 8 TeV. by :
Download or read book Search for Resonant Pair Production of Higgs Bosons Decaying to Two Bottom Quark{u2013}antiquark Pairs in Proton{u2013}proton Collisions at 8 TeV. written by and published by . This book was released on 2015 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: A model-independent search for a narrow resonance produced in proton–proton collisions at √s = 8 TeV and decaying to a pair of 125 GeV Higgs bosons that in turn each decays into a bottom quark–antiquark pair is performed by the CMS experiment at the LHC. We analyzed the data so that it corresponded to an integrated luminosity of 17.9 fb-1. No evidence for a signal is observed. Upper limits at a 95% confidence level on the production cross section for such a resonance, in the mass range from 270 to 1100 GeV, are reported. A radion with decay constant of 1 TeV and mass from 300 to 1100 GeV, and a Kaluza–Klein graviton with mass from 380 to 830 GeV are excluded at a 95% confidence level.
Book Synopsis Search for Narrow High-mass Resonances in Proton-proton Collisions at $\sqrt{s}$ by :
Download or read book Search for Narrow High-mass Resonances in Proton-proton Collisions at $\sqrt{s}$ written by and published by . This book was released on 2015 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for a narrow, high-mass resonance decaying into Z and Higgs (H) bosons is presented. The final state studied consists of a merged jet pair and a [tau] pair resulting from the decays of Z and H bosons, respectively. This analysis is based on a data sample of proton-proton collisions at a center-ofmass energy of 8 TeV, collected with the CMS experiment in 2012, and corresponding to an integrated luminosity of 19.7 fb-1. In the resonance mass range of interest, which extends from 0.8 to 2.5 TeV, the Z and H bosons are produced with large momenta, which implies that the final products of the two quarks or the two [tau] leptons must be detected within a small angular interval. A combination of all possible decay modes of the [tau] leptons, production cross sections in a range between 0.9 and 27.8 fb are excluded at 95% confidence level, depending on the resonance mass.
Book Synopsis Search for Massive Resonances Decaying Into Pairs of Boosted Bosons in Semi-leptonic Final States at $\sqrt{s} by :
Download or read book Search for Massive Resonances Decaying Into Pairs of Boosted Bosons in Semi-leptonic Final States at $\sqrt{s} written by and published by . This book was released on 2014 with total page 59 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our search for new resonances decaying to WW, ZZ, or WZ is presented. Final states are considered in which one of the vector bosons decays leptonically and the other hadronically. Results are based on data corresponding to an integrated luminosity of 19.7 fb-1 recorded in proton-proton collisions at √s = 8 TeV with the CMS detector at the CERN LHC. Techniques aiming at identifying jet substructures are used to analyze signal events in which the hadronization products from the decay of highly boosted W or Z bosons are contained within a single reconstructed jet. Upper limits on the production of generic WW, ZZ, or WZ resonances are set as a function of the resonance mass and width. We also increase the sensitivity of the analysis by statistically combining the results of this search with a complementary study of the all-hadronic final state. Upper limits at 95% confidence level are set on the bulk graviton production cross section in the range from 700 to 10 fb for resonance masses between 600 and 2500 GeV, respectively. These limits on the bulk graviton model are the most stringent to date in the diboson final state.
Book Synopsis Search for Resonant Pair Production of Higgs Bosons in the Bb ̄bb ̄ Final State Using Pp Collisions at S by : [Study Group] ATLAS Collaboration CERN
Download or read book Search for Resonant Pair Production of Higgs Bosons in the Bb ̄bb ̄ Final State Using Pp Collisions at S written by [Study Group] 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: Abstract: A search for resonant Higgs boson pair production in the b ̄bb ̄b final state is presented. The analysis uses 126 fb−1-139 fb−1 of pp collision data at √s=13 TeV collected with the ATLAS detector at the Large Hadron Collider. The analysis is divided into two channels, targeting Higgs boson decays which are reconstructed as pairs of small-radius jets or as individual large-radius jets. Spin-0 and spin-2 benchmark signal models are considered, both of which correspond to resonant HH production via gluon-gluon fusion. The data are consistent with Standard Model predictions. Upper limits are set on the production cross section times branching ratio to Higgs boson pairs of a new resonance in the mass range from 251 GeV to 5 TeV
Book Synopsis Search for Pair-produced Resonances Decaying to Top Quarks and Jets in Proton-proton Collisions at 8 TeV with the CMS Detector at the LHC by : Gala Nicolas Kaufman
Download or read book Search for Pair-produced Resonances Decaying to Top Quarks and Jets in Proton-proton Collisions at 8 TeV with the CMS Detector at the LHC written by Gala Nicolas Kaufman and published by . This book was released on 2014 with total page 394 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for pair production of new physics resonances decaying into a top quark and a light parton in final states with two leptons, interpreting the results in the context of an R-parity violating supersymmetric model. We use 19.5 fb[-]1 of data collected by the CMS experiment at the LHC from proton-proton collisions at s = 8 TeV in 2012. The experimental signature consists of two leptons (e or [MICRO SIGN]), two jets identified as originating from the decay of a b quark, and two jets identified as coming from light flavor quarks or gluons. We reconstruct and analyze potential resonant decays. The dominant standard model background is top quark pair production with additional jets from initialor final-state radiation. We perform an extended unbinned maximum likelihood fit to the transverse momenta of the two leading light jets and the reconstructed resonance mass. The observation is consistent with the standard model expectation, and we set upper limits on the signal cross section for R-parity violating bottom squarks with masses between 250 and 600 GeV. We exclude R-parity violating bottom squark pair production at the 95% confidence level between 250 GeV and 326 GeV.
Book Synopsis Search for Massive Resonances Decaying Into WW, WZ Or ZZ Bosons in Proton-proton Collisions at Sqrt(s) by :
Download or read book Search for Massive Resonances Decaying Into WW, WZ Or ZZ Bosons in Proton-proton Collisions at Sqrt(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 new massive resonances decaying to WW, WZ or ZZ bosons in l nu quark anti-quark and quark anti-quark quark anti-quark final states. Results are based on data corresponding to an integrated luminosity of 2.3-2.7 inverse femtobarns recorded in proton-proton collisions at sqrt(s) = 13 TeV with the CMS detector at the LHC. Decays of spin-1 and spin-2 resonances into two vector bosons are sought in the mass range 0.6-4.0 TeV. No significant excess over the standard model background is observed. Combining the results of the l nu quark anti-quark and quark anti-quark quark anti-quark final states, cross section and mass exclusion limits are set for models that predict heavy spin-1 and spin-2 resonances. This is the first search for a narrow-width spin-2 resonance at sqrt(s) = 13 TeV.
Book Synopsis A Search for Heavy Resonances Decaying to HH → Bb̄bb̄ with the ATLAS Detector by : Alexander Zack Emerman
Download or read book A Search for Heavy Resonances Decaying to HH → Bb̄bb̄ with the ATLAS Detector written by Alexander Zack Emerman and published by . This book was released on 2021 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for Higgs boson pairs produced in the decay of high mass exotic resonances is presented. The search uses the bb̄bb̄ final state, analyzing 139 fb−1 of proton-proton collision data at √s = 13 TeV collected with the ATLAS detector. Spin-0 and spin-2 benchmark signal models are considered and no significant deviation from the Standard Model prediction is observed. The search is combined with a complementary analysis for lower mass resonances to set upper limits on the production cross-section times HH branching ratio of new resonances in the mass range of 251 GeV to 5 TeV. In addition, the methodology for the in-situ calibration of a novel double-b-tagging algorithm (Xbb2020) using gluon to bb̄ decays is presented. Preliminary scale factors for Monte-Carlo simulation are computed using 139 fb−1 of √s = 13 TeV pp collision data collected with the ATLAS detector. The completed calibration will allow the Xbb2020 algorithm to be used in future ATLAS searches for H → bb̄ decays.
Book Synopsis Search for Heavy Resonances Decaying to Tau Lepton Pairs in Proton-proton Collisions at $\sqrt{s}$ by :
Download or read book Search for Heavy Resonances Decaying to Tau Lepton Pairs in Proton-proton Collisions at $\sqrt{s}$ 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 for heavy resonances that decay to tau lepton pairs is performed using proton-proton collisions at \sqrt{s}$ = 13 TeV. The data were collected with the CMS detector at the CERN LHC and correspond to an integrated luminosity of 2.2 inverse femtobarns. The observations are in agreement with standard model predictions. An upper limit at 95% confidence level on the product of the production cross section and branching fraction into tau lepton pairs is calculated as a function of the resonance mass. For the sequential standard model, the presence of Z' bosons decaying into tau lepton pairs is excluded for Z' masses below 2.1 TeV, extending previous limits for this final state. For the topcolor-assisted technicolor model, which predicts Z' bosons that preferentially couple to third-generation fermions, Z' masses below 1.7 TeV are excluded, representing the most stringent limit to date.
Book Synopsis Search for Pair-produced Resonances Decaying to Jet Pairs in Proton-proton Collisions at [arrow]" by :
Download or read book Search for Pair-produced Resonances Decaying to Jet Pairs in Proton-proton Collisions at [arrow]" written by and published by . This book was released on 2015 with total page 31 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are reported of a general search for pair production of heavy resonances decaying to pairs of jets in events with at least four jets. The study is based on up to 19.4 inverse femtobarns of integrated luminosity from proton-proton collisions at a center-of-mass energy of 8 TeV, recorded with the CMS detector at the LHC. Limits are determined on the production of scalar top quarks (top squarks) in the framework of R-parity violating supersymmetry and on the production of color-octet vector bosons (colorons). First limits at the LHC are placed on top squark production for two scenarios. The first assumes decay to a bottom quark and a light-flavor quark and is excluded for masses between 200 and 385 GeV, and the second assumes decay to a pair of light-flavor quarks and is excluded for masses between 200 and 350 GeV at 95% confidence level. Previous limits on colorons decaying to light-flavor quarks are extended to exclude masses from 200 to 835 GeV.
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.
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