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Search For Light Bosons In Decays Of The 125 Gev Higgs Boson In Proton Proton Collisions At Sqrts
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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 Light Bosons in Decays of the 125 GeV Higgs Boson in Proton-proton Collisions at √s by :
Download or read book Search for Light Bosons in Decays of the 125 GeV Higgs Boson 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 Very Light NMSSM Higgs Boson Produced in Decays of the 125 GeV Scalar Boson and Decaying Into Tau Leptons in Pp Collisions at the LHC by : Amithabh Shrinivas
Download or read book Search for a Very Light NMSSM Higgs Boson Produced in Decays of the 125 GeV Scalar Boson and Decaying Into Tau Leptons in Pp Collisions at the LHC written by Amithabh Shrinivas and published by . This book was released on 2016 with total page 154 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for a very light Higgs boson decaying into a pair of tau leptons is presented within the framework of the next-to-minimal supersymmetric standard model(NMSSM). This search is based on a data set corresponding to an integrated luminosity of 19.7 fb-1 and 2.5 fb-1 of proton-proton collisions collected by the CMS experiment at a centre-of-mass energy of 8 TeV and 13 TeV respectively. The signal consists of the production of either of the two lightest scalars, h1 or h2, via gluon-gluon fusion and subsequent decay into a pair of the lightest Higgs bosons, a1 or h1. The h1 or h2 boson is identified with the observed state at a mass of 125 GeV. The analysis searches for decays of the a1(h1) states into pairs of tau leptons and covers a mass range for the a1(h1) boson of 4 to 15 GeV. The search reveals no significant excess in data above standard model background expectations, and an upper limit is set on the signal production cross section times branching fraction as a function of the a 1(h1) boson mass.
Book Synopsis Search for a Very Light NMSSM Higgs Boson Produced in Decays of the 125 GeV Scalar Boson and Decaying Into $\tau$ Leptons in Pp Collisions at $\sqrt{s} by :
Download or read book Search for a Very Light NMSSM Higgs Boson Produced in Decays of the 125 GeV Scalar Boson and Decaying Into $\tau$ Leptons in Pp Collisions at $\sqrt{s} written by and published by . This book was released on 2015 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt: Our search for a very light Higgs boson decaying into a pair of t leptons is presented within the framework of the next-to-minimal supersymmetric standard model. This search is based on a data set corresponding to an integrated luminosity of 19.7 fb-1 of proton-proton collisions collected by the CMS experiment at a centre-of-mass energy of 8 TeV. The signal is defined by the production of either of the two lightest scalars, h1 or h2, via gluon-gluon fusion and subsequent decay into a pair of the lightest Higgs bosons, a1 or h1. The h1 or h2 boson is identified with the observed state at a mass of 125 GeV. The analysis searches for decays of the a1 (h1) states into pairs of t leptons and covers a mass range for the a1 (h1) boson of 4 to 8 GeV. Furthermore, the search reveals no significant excess in data above standard model background expectations, and an upper limit is set on the signal production cross section times branching fraction as a function of the a1 (h1) boson mass. The 95% confidence level limit ranges from 4.5 pb at ma1 (mh1) = 8 GeV to 10.3 pb at ma1 (mh1) = 5 GeV.
Book Synopsis The Twofold Existence of Particles and Nuclei by : Hans-Dieter Herrmann
Download or read book The Twofold Existence of Particles and Nuclei written by Hans-Dieter Herrmann and published by BoD – Books on Demand. This book was released on 2024-02-14 with total page 249 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Book contains a new proposal for physics within more than four dimensions (3 spatial dimensions + 1 time coordinate). An extra space is introduced, called basic space, instead of extra dimensions, compactified or otherwise embedded in space-time. A "dual space concept" has been applied by the author to construct models of particles, photons and nuclei mainly in a bottom -- up process. The top - down reasoning, the dominating method in theoretical physics, is only used in a second step. The kind of "twofold existence" discussed in this book turns out to be useful for describing natural systems in the living and non-living world.
Book Synopsis Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like? by : Roman Pasechnik
Download or read book Phenomena Beyond the Standard Model: What Do We Expect for New Physics to Look Like? written by Roman Pasechnik and published by Frontiers Media SA. This book was released on 2020-09-03 with total page 180 pages. Available in PDF, EPUB and Kindle. Book excerpt: This eBook is a collection of articles from a Frontiers Research Topic. Frontiers Research Topics are very popular trademarks of the Frontiers Journals Series: they are collections of at least ten articles, all centered on a particular subject. With their unique mix of varied contributions from Original Research to Review Articles, Frontiers Research Topics unify the most influential researchers, the latest key findings and historical advances in a hot research area! Find out more on how to host your own Frontiers Research Topic or contribute to one as an author by contacting the Frontiers Editorial Office: frontiersin.org/about/contact.
Book Synopsis Search for Light Bosons in Exotic Decays of the 125 GeV Higgs Boson by : Danyer Pérez Adán
Download or read book Search for Light Bosons in Exotic Decays of the 125 GeV Higgs Boson written by Danyer Pérez Adán and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Light Pseudoscalar Boson Pairs Produced from Decays of the 125 GeV Higgs Boson in Final States with Two Muons and Two Nearby Tracks in Pp Collisions at √s by :
Download or read book Search for Light Pseudoscalar Boson Pairs Produced from Decays of the 125 GeV Higgs Boson in Final States with Two Muons and Two Nearby Tracks in Pp Collisions at √s written by 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 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.
Book Synopsis A Search for Lepton-Flavor-Violating Decays of the 125 GeV Higgs Boson with Hadronically Decaying Tau Leptons in the 20.3 Fb^{-1}, \sqrt{s} by : Robert Najem Clarke
Download or read book A Search for Lepton-Flavor-Violating Decays of the 125 GeV Higgs Boson with Hadronically Decaying Tau Leptons in the 20.3 Fb^{-1}, \sqrt{s} written by Robert Najem Clarke and published by . This book was released on 2016 with total page 232 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dissertation presents a search for lepton-flavor-violating (LFV) decays of the 125 GeV Higgs boson in final states of \mu\tau_{\mathrm{had}} and e\tau_{\mathrm{had}} in the full dataset collected by the ATLAS detector in 2012. The search is based on data samples of proton--proton collisions at \sqrt{s} = 8 TeV, corresponding to an integrated luminosity of 20.3 fb^{-1}. The topology of LFV events is exploited through an optimized selection of objects and events, with signal and control regions defined by event kinematics. A binned likelihood fit searching for the presence of LFV Higgs decays is performed using the reconstructed Higgs boson mass as the discriminating variable. No such decays are observed. The expected (observed) upper limits at 95% confidence on the branching ratios for the muon and electron final states are found to be Br(H \rightarrow \mu\tau) = 1.24% (1.85%) and Br(H \rightarrow e\tau) = 2.07% (1.81%).
Book Synopsis Search for Exotic Decays of a Higgs Boson Into Undetectable Particles and One Or More Photons by :
Download or read book Search for Exotic Decays of a Higgs Boson Into Undetectable Particles and One Or More Photons written by and published by . This book was released on 2015 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search is presented for exotic decays of a Higgs boson into undetectable particles and one or two isolated photons in pp collisions at a center-of-mass energy of 8 TeV. The data correspond to an integrated luminosity of up to 19.4 inverse femtobarns collected with the CMS detector at the LHC. Higgs bosons produced in gluon-gluon fusion and in association with a Z boson are investigated, using models in which the Higgs boson decays into a gravitino and a neutralino or a pair of neutralinos, followed by the decay of the neutralino to a gravitino and a photon. The selected events are consistent with the background-only hypothesis, and limits are placed on the product of cross sections and branching fractions. Assuming a standard model Higgs boson production cross section, a 95% confidence level upper limit is set on the branching fraction of a 125 GeV Higgs boson decaying into undetectable particles and one or two isolated photons as a function of the neutralino mass. For this class of models and neutralino masses from 1 to 120 GeV an upper limit in the range of 7 to 13% is obtained. Further results are given as a function of the neutralino lifetime, and also for a range of Higgs boson masses.
Book Synopsis Search for New Light Gauge Bosons in Higgs Boson Decays to Four-lepton Final States in Pp Collisions at \(\sqrt{s} by :
Download or read book Search for New Light Gauge Bosons in Higgs Boson Decays to Four-lepton Final States in Pp Collisions at \(\sqrt{s} written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This research presents a search for Higgs bosons decaying to four leptons, either electrons or muons, via one or two light exotic gauge bosons Zd, H 2!ZZd 2!4l or H 2!ZdZd 2!4l. The search was performed using pp collision data corresponding to an integrated luminosity of about 20 fb-1 at the center-of-mass energy of \(\sqrt{s} = 8\) TeV recorded with the ATLAS detector at the Large Hadron Collider. The observed data are well described by the Standard Model prediction. Upper bounds on the branching ratio of H 2!ZZd 2!4l and on the kinetic mixing parameter between the Zd and the Standard Model hypercharge gauge boson are set in the range (1-9) × 10-5 and (4-17) × 10-2 respectively, at 95% confidence level assuming the Standard Model branching ratio of H 2!ZZ* 2!4l, for Zd masses between 15 and 55 GeV. Upper bounds on the effective mass mixing parameter between the Z and the Zd are also set using the branching ratio limits in the H 2!ZZd 2!4l search, and are in the range (1.5-8.7) × 10-4 for 15
Book Synopsis Search for Invisible Higgs-boson Decays in Events with Vector-boson Fusion Signatures Using 139 Fb−1 of Proton-proton Data Recorded by the ATLAS Experiment by : [Study Group] ATLAS Collaboration CERN
Download or read book Search for Invisible Higgs-boson Decays in Events with Vector-boson Fusion Signatures Using 139 Fb−1 of Proton-proton Data Recorded by the ATLAS Experiment 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 direct search for Higgs bosons produced via vector-boson fusion and subsequently decaying into invisible particles is reported. The analysis uses 139 fb−1 of pp collision data at a centre-of-mass energy of s√ = 13 TeV recorded by the ATLAS detector at the LHC. The observed numbers of events are found to be in agreement with the background expectation from Standard Model processes. For a scalar Higgs boson with a mass of 125 GeV and a Standard Model production cross section, an observed upper limit of 0.145 is placed on the branching fraction of its decay into invisible particles at 95% confidence level, with an expected limit of 0.103. These results are interpreted in the context of models where the Higgs boson acts as a portal to dark matter, and limits are set on the scattering cross section of weakly interacting massive particles and nucleons. Invisible decays of additional scalar bosons with masses from 50 GeV to 2 TeV are also studied, and the derived upper limits on the cross section times branching fraction decrease with increasing mass from 1.0 pb for a scalar boson mass of 50 GeV to 0.1 pb at a mass of 2 TeV
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 Supersymmetric Exotic Decays of the 125 GeV Higgs Boson by :
Download or read book Supersymmetric Exotic Decays of the 125 GeV Higgs Boson written by and published by . This book was released on 2014 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We reveal a set of novel decay topologies for the 125 GeV Higgs boson in supersymmetry which are initiated by its decay into a pair of neutralinos, and discuss their collider search strategies. This category of exotic Higgs decays are characterized by the collider signature: visible objects + $\mbox{${\not\! E}_{\rm T}$}$, with $\mbox{${\not\! E}_{\rm T}$}$ dominantly arising from escaping dark matter particles. Their benchmark arises naturally in the Peccei-Quinn symmetry limit of the MSSM singlet-extensions, which is typified by the co-existence of three light particles: singlet-like scalar $h_1$ and pseudoscalar $a_1$, and singlino-like neutralino $\chi_1$, all with masses of $\lesssim 10$ GeV, and the generically suppression of the exotic decays of the 125 GeV Higgs boson $h_2\to h_1 h_1$, $a_1a_1$ and $\chi_1\chi_1$, however. As an illustration, we study the decay topology: $h_2 \to \chi_1 \chi_2$, where the bino-like $\chi_2$ decays to $h_1 \chi_1$ or $a_1 \chi_1$, and $h_1/a_1 \to f\bar f$, with $f\bar f = \mu^+\mu^-$, $b\bar b$. In the di-muon case ($m_{h_1/a_1} \sim 1$ GeV), a statistical sensitivity of $\frac{S}{\sqrt{B}}> 6 \sigma$ can be achieved easily at the 8 TeV LHC, assuming $\frac{\sigma(pp \rightarrow W h_2)}{\sigma(pp \rightarrow W h_{\rm SM})} {\rm Br}(h_2 \to \mu^+\mu^- \chi_1 \chi_1)=0.1$. In the $b\bar b$ case ($m_{h_1/a_1} \sim 45$ GeV), 600 fb$^{-1}$ data at the 14 TeV LHC can lead to a statistical sensitivity of $\frac{S}{\sqrt{B}}> 5 \sigma$, assuming $\frac{\sigma(pp \rightarrow Z h_2)}{\sigma(pp \rightarrow Z h_{\rm SM})} {\rm Br}(h_2 \to b\bar b \chi_1 \chi_1)=0.5$. These exotic decays open a new avenue for exploring new physics couplings with the 125 GeV Higgs boson at colliders.
Book Synopsis Search for a Higgs Boson in the Mass Range from 145 to 1000 GeV Decaying to a Pair of W Or Z Bosons by :
Download or read book Search for a Higgs Boson in the Mass Range from 145 to 1000 GeV Decaying to a Pair of W Or Z Bosons written by and published by . This book was released on 2015 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: A search for a heavy Higgs boson in the H 2!WW and H 2!ZZ decay channels is reported. The search is based upon proton-proton collision data samples corresponding to an integrated luminosity of up to 5.1 fb-1 at [arrow]" = 7 TeV and up to 19.7fb-1 at [arrow]" = 8 TeV, recorded by the CMS experiment at the CERN LHC. Several final states of the H 2!WW and H 2!ZZ decays are analyzed. The combined upper limit at the 95% confidence level on the product of the cross section and branching fraction exclude a Higgs boson with standard model-like couplings and decays in the range 145
Book Synopsis Search for Lepton Flavour Violating Decays of the Higgs Boson to E Tau and E Mu in Proton-proton Collisions at Sqrt(s) by :
Download or read book Search for Lepton Flavour Violating Decays of the Higgs Boson to E Tau and E Mu 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 direct search for lepton flavour violating decays of the Higgs boson (H) in the H to e tau and H to e mu channels is described. The data sample used in the search was collected in proton-proton collisions at sqrt(s)=8 TeV with the CMS detector at the LHC and corresponds to an integrated luminosity of 19.7 inverse femtobarns. No evidence is found for lepton flavour violating decays in either final state. Upper limits on the branching fractions, B(H to e tau)
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