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Search For High Mass Diphoton Resonances In Pp Collisions At U221as
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Book Synopsis Search for High-mass Diphoton Resonances in pp Collisions at {u221A}s by :
Download or read book Search for High-mass Diphoton Resonances in pp Collisions at {u221A}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 article describes a search for high-mass resonances decaying to a pair of photons using a sample of 20.3 fb-1 of pp collisions at √s = 8 TeV recorded with the ATLAS detector at the Large Hadron Collider. The data are found to be in agreement with the Standard Model prediction, and limits are reported in the framework of the Randall-Sundrum model. This theory leads to the prediction of graviton states, the lightest of which could be observed at the Large Hadron Collider. A lower limit of 2.66 (1.41) TeV at 95% confidence level is set on the mass of the lightest graviton for couplings of k/M¯Pl = 0.1 (0.01).
Book Synopsis Search for High-mass Diphoton Resonances in Pp Collisions at [arrow]" by :
Download or read book Search for High-mass Diphoton Resonances 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:
Book Synopsis Search for High-mass Diphoton Resonances in Proton-proton Collisions at 13 TeV and Combination with 8 TeV Search by :
Download or read book Search for High-mass Diphoton Resonances in Proton-proton Collisions at 13 TeV and Combination with 8 TeV Search written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of a search are presented for the resonant production of high-mass photon pairs, specifically spin-0 and spin-2 resonances with an invariant mass between 0.5 and 4.5 TeV, and with a width, relative to the mass, between 1.4E-4 and 5.6E-2. The data sample corresponds to an integrated luminosity of 12.9 inverse femtobarns of proton-proton collisions collected with the CMS detector in 2016 at a center-of-mass energy of 13 TeV. No significant excess is observed relative to the standard model expectation. The results of the search are combined statistically with those previously obtained in 2012 and 2015 at sqrt(s)=8 and 13TeV, respectively, corresponding to integrated luminosities of 19.7 and 3.3 inverse femtobarns, to derive exclusion limits on scalar resonances produced through gluon-gluon fusion, and on Randall-Sundrum gravitons. The lower mass limits for Randall-Sundrum gravitons range from 1.95 to 4.45 TeV for coupling parameters between 0.01 and 0.2. These are the most stringent limits on Randall-Sundrum graviton production to date.
Book Synopsis Search for High-mass Diphoton Resonances in Proton-proton Collisions at 13 TeV and Combination with 8 TeV Search by :
Download or read book Search for High-mass Diphoton Resonances in Proton-proton Collisions at 13 TeV and Combination with 8 TeV Search written by and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Diphoton Resonances in the Mass Range from 150 to 850 GeV in Pp Collisions at $\sqrt{s}$ by :
Download or read book Search for Diphoton Resonances in the Mass Range from 150 to 850 GeV in Pp Collisions at $\sqrt{s}$ written by and published by . This book was released on 2015 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: Results are presented of a search for heavy particles decaying into two photons. The analysis is based on a 19.7fb-1 sample of proton-proton collisions at $\sqrt{s}$ = 8 TeV collected with the CMS detector at the CERN LHC. The diphoton mass spectrum from 150 to 850 GeV is used to search for an excess of events over the background. The search is extended to new resonances with natural widths of up to 10% of the mass value. No evidence for new particle production is observed and limits at 95% confidence level on the production cross section times branching fraction to diphotons are determined. These limits are interpreted in terms of two-Higgs-doublet model parameters.
Book Synopsis Search for High-mass Resonances Decaying to E? in P$\bar{p}$ Collisions at {u221A}s by :
Download or read book Search for High-mass Resonances Decaying to E? in P$\bar{p}$ Collisions at {u221A}s written by and published by . This book was released on 2006 with total page 126 pages. Available in PDF, EPUB and Kindle. Book excerpt: We describe a general search for resonances decaying to a neutral e? final state in p$\bar{p}$ collisions at a center-of-mass energy of 1.96 TeV. Using a data sample representing 344 pb-1 of integrated luminosity recorded by the CDF II experiment, we compare Standard Model predictions with the number of observed events for invariant masses between 50 and 800 GeV/c2. Finding no significant excess (5 events observed vs. 7.7 ± 0.8 expected for Msube? /sub” 100 GeV/csup2
Book Synopsis Search for New Resonances in W? and Z? Final States in Pp Collisions at {u221A} S by :
Download or read book Search for New Resonances in W? and Z? Final States in Pp Collisions at {u221A} S written by and published by . This book was released on 2014 with total page 20 pages. Available in PDF, EPUB and Kindle. Book excerpt: This Letter presents a search for new resonances decaying to final states with a vector boson produced in association with a high transverse momentum photon, V? , with V=W(→l?) or Z(→l+l-), where l=e or ?. The measurements use 20.3 fb-1 of proton–proton collision data at a center-of-mass energy of √s = 8 TeV recorded with the ATLAS detector. No deviations from the Standard Model expectations are found, and production cross section limits are set at 95% confidence level. Masses of the hypothetical aT and ?T states of a benchmark Low Scale Technicolor model are excluded in the ranges [275,960] GeV and [200,700]?[750,890] GeV, respectively. Limits at 95% confidence level on the production cross section of a singlet scalar resonance decaying to Z? final states have also been obtained for masses below 1180 GeV.
Book Synopsis Search for High Mass Photon Pairs in P[anti P] Collisions At[radical] by :
Download or read book Search for High Mass Photon Pairs in P[anti P] Collisions At[radical] written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present results of a search for diphoton resonances produced inclusively and in association with a vector boson using 100 pb[sup[minus]1] of p[anti p] collisions using the CDF detector. They set upper limits on the product of cross section times branching ratio for p[anti p][r-arrow][gamma][gamma][r-arrow] X and p[anti p][r-arrow][gamma][gamma][r-arrow] W/Z. Using a NLO prediction for associated production cross section of a Higgs with a vector boson (W or Z), they set an upper limit on the branching ratio for H[r-arrow][gamma][gamma]. They set a lower limit on the mass of a'bosophilic' Higgs boson (e.g. one which couples only to[gamma], W, and Z bosons with Standard Model couplings) of 82 GeV/c[sup 2] at 95% C.L.
Book Synopsis Search for High Mass Photon Pairs in P{anti P} Collisions at √s by :
Download or read book Search for High Mass Photon Pairs in P{anti P} Collisions at √s written by and published by . This book was released on 1998 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present results of a search for diphoton resonances produced inclusively and in association with a vector boson using 100 pb−1 of p{anti p} collisions using the CDF detector. They set upper limits on the product of cross section times branching ratio for p{anti p} →?? → X and p{anti p} →?? → W/Z. Using a NLO prediction for associated production cross section of a Higgs with a vector boson (W or Z), they set an upper limit on the branching ratio for H →??. They set a lower limit on the mass of a b̀osophilic ̀Higgs boson (e.g. one which couples only to?, W, and Z bosons with Standard Model couplings) of 82 GeV/c2 at 95% C.L.
Book Synopsis Search for Heavy Lepton Resonances Decaying to a Z Boson and a Lepton in Pp Collisions at {u221A}s by :
Download or read book Search for Heavy Lepton Resonances Decaying to a Z Boson and a Lepton in Pp Collisions at {u221A}s written by and published by . This book was released on 2015 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: In this study, a search for heavy leptons decaying to a Z boson and an electron or a muon is presented. The search is based on pp collision data taken at √s=8 TeV by the ATLAS experiment at the CERN Large Hadron Collider, corresponding to an integrated luminosity of 20.3 fb−1. Three high-transverse-momentum electrons or muons are selected, with two of them required to be consistent with originating from a Z boson decay. No significant excess above Standard Model background predictions is observed, and 95% confidence level limits on the production cross section of high-mass trilepton resonances are derived. The results are interpreted in the context of vector-like lepton and type-III seesaw models. For the vector-like lepton model, most heavy lepton mass values in the range 114–176 GeV are excluded. For the type-III seesaw model, most mass values in the range 100–468 GeV are excluded.
Book Synopsis Search for High Mass Dilepton Resonances in Pp Collisions at $\sqrt{s} by :
Download or read book Search for High Mass Dilepton Resonances in Pp Collisions at $\sqrt{s} written by and published by . This book was released on 2011 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This article presents a search for high mass e+e− or ?+?− resonances in pp collisions at √s = 7 TeV at the LHC. The data were recorded by the ATLAS experiment during 2010 and correspond to a total integrated luminosity of ̃40 pb−1. No statistically significant excess above the Standard Model expectation is observed in the search region of dilepton invariant mass above 110 GeV. Upper limits at the 95% confidence level are set on the cross section times branching ratio of Z' resonances decaying to dielectrons and dimuons as a function of the resonance mass. A lower mass limit of 1.048 TeV on the Sequential Standard Model Z' boson is derived, as well as mass limits on Z' and E6-motivated Z' models.
Book Synopsis Search for High-Mass Resonances Decaying Into Leptons of Different Flavor (e?, E ?, ??) in P Anti-p Collisions at {u221A}(s) by :
Download or read book Search for High-Mass Resonances Decaying Into Leptons of Different Flavor (e?, E ?, ??) in P Anti-p Collisions at {u221A}(s) written by and published by . This book was released on 2008 with total page 97 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for high-mass resonances decaying into two leptons of different flavor: e?, e ?, ??. These resonances are predicted by several models beyond the standard model, such as the R-parity-violating MSSM. The search is based on 1 fb-1 of data collected at the Collider Detector at Fermilab (CDF II) in proton anti-proton collisions. Our observations are consistent with the standard model expectations. The results are interpreted to set 95% C.L. upper limits on ? x BR of $ ilde{v}$? → e?, e ?, ??.
Book Synopsis Search for High-Mass Dielectron Resonances in PP Collisions at √S by : Tetteh Addy (Nii)
Download or read book Search for High-Mass Dielectron Resonances in PP Collisions at √S written by Tetteh Addy (Nii) and published by . This book was released on 2012 with total page 138 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Resonances in Diphoton Events at $\sqrt{s} by :
Download or read book Search for Resonances in Diphoton Events at $\sqrt{s} written by and published by . This book was released on 2016 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt: Searches for new resonances decaying into two photons in the ATLAS experiment at the CERN Large Hadron Collider are described. The analysis is based on proton-proton collision data corresponding to an integrated luminosity of 3.2 fb-1 at √s = 13 TeV recorded in 2015. Two searches are performed, one targeted at a spin-2 particle of mass larger than 500 GeV, using Randall-Sundrum graviton states as a benchmark model, and one optimized for a spin-0 particle of mass larger than 200 GeV. Varying both the mass and the decay width, the most significant deviation from the background-only hypothesis is observed at a diphoton invariant mass around 750 GeV with local significances of 3.8 and 3.9 standard deviations in the searches optimized for a spin-2 and spin-0 particle, respectively. The global significances are estimated to be 2.1 standard deviations for both analyses. As a result, the consistency between the data collected at 13 TeV and 8 TeV is also evaluated. Limits on the production cross section times branching ratio to two photons for the two resonance types are reported.
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 High-mass Resonances Decaying to E Mu in P Anti-p Collisions at S**1/2 by :
Download or read book Search for High-mass Resonances Decaying to E Mu in P Anti-p Collisions at S**1/2 written by and published by . This book was released on 2006 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Search for Resonant Production of High-mass Photon Pairs in Proton-proton Collisions at Sqrt(s) by :
Download or read book Search for Resonant Production of High-mass Photon 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 the resonant production of high-mass photon pairs is presented. The analysis is based on samples of proton-proton collision data collected by the CMS experiment at center-of-mass energies of 8 and 13 TeV, corresponding to integrated luminosities of 19.7 and 3.3 inverse femtobarns, respectively. The search focuses on spin-0 and spin-2 resonances with masses between 0.5 and 4 TeV and with widths, relative to the mass, between 1.4E-4 and 5.6E-2. Limits are set on scalar resonances produced through gluon-gluon fusion, and on Randall--Sundrum gravitons. A modest excess of events compatible with a narrow resonance with a mass of about 750 GeV is observed. The local significance of the excess is approximately 3.4 standard deviations. The significance is reduced to 1.6 standard deviations once the effect of searching under multiple signal hypotheses is considered. More data are required to determine the origin of this excess.
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