Download or read book Investigation of Trilinear Vector Boson Couplings Through W Boson Pair Production in Dilepton Decay Channels written by Paul C. Bloom and published by . This book was released on 1998 with total page 566 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Vector Boson Pair Production and Trilinear Gauge Boson Couplings Results from the Tevatron written by and published by . This book was released on 2000 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct measurements of vector boson pair production processes and trilinear gauge boson couplings have been conducted by the CDF and D0 Collaborations. Preliminary results from searches for anomalous WW/WZ [yields] [mu][nu] jet jet and WZ [yields] eee[nu] production are presented. 95% CL anomalous coupling limits from previously published D0 results are -0.20
Download or read book Search for W Z Production in the Tri lepton Channel at the Tevatron and Limits of the W W Z Vertex Anomalous Couplings written by Patrick Elmo Gartung and published by . This book was released on 1998 with total page 328 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for W Boson Pair Production in P bar P Collisions at s written by and published by . This book was released on 1995 with total page 9 pages. Available in PDF, EPUB and Kindle. Book excerpt: The results of a search for W boson pair production in p{bar p} collisions at √s = 1.8 TeV with subsequent decay to dilepton (e?, ee, and??) channels are presented. One event is observed with an expected background of 0.56 ± 0.13 events with an integrated luminosity of approximately 14 pb−1. Assuming equal strengths for the WWZ and WW? gauge boson coupling parameters? and?, limits on the CP-conserving anomalous coupling constants are -2.6
Download or read book Search for W Boson Pair Production in P bar 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 results of a search for W boson pair production in p[bar p] collisions at[radical]s= 1.8 TeV with subsequent decay to dilepton (e[mu], ee, and[mu][mu]) channels are presented. One event is observed with an expected background of 0.56[plus-minus] 0.13 events with an integrated luminosity of approximately 14 pb[sup[minus]1]. Assuming equal strengths for the WWZ and WW[gamma] gauge boson coupling parameters[kappa] and[lambda], limits on the CP-conserving anomalous coupling constants are[minus]2.6
Download or read book Measurements of Trilinear Gauge Boson Couplings written by and published by . This book was released on 1997 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct measurements of the trilinear gauge boson couplings by the D0 collaboration at Fermilab are reported. Limits on the anomalous couplings were obtained at a 95% CL from four diboson production processes: W[gamma] production with the W boson decaying to e[nu] or [mu][nu], WW production with both of the W bosons decaying to e[nu] or [mu][nu], WW/WZ production with one W boson decaying to e[nu] and the other W or Z boson decaying to two jets, and Z[gamma] production with the Z boson decaying to ee, [mu][mu], or [nu][nu]. Limits were also obtained from a combined fit to W[gamma], WW → dileptons and WW/WZ → e[nu]jj data samples.
Download or read book Tevatron Results on Gauge Boson Couplings written by and published by . This book was released on 1997 with total page 16 pages. Available in PDF, EPUB and Kindle. Book excerpt: Direct measurements of the trilinear gauge boson couplings by the CDF and D0 collaborations at Fermilab are reviewed. Limits on the anomalous couplings were obtained at a 95% CL from four diboson production processes: W[gamma] production with the subsequent W boson decay to e[nu] or [mu][nu], WW production with both the W boson decaying to e[nu] or [mu][nu], WW/WZ production with one of the gauge bosons decaying leptonically and the other gauge boson decaying to two jets, and Z[gamma] production with the subsequent Z boson decay to ee, [mu][mu], or [nu][nu]. Limits were also obtained by a combined fit to W[gamma], WW→dileptons and WW/WZ semileptonic data samples.
Download or read book Vector Boson Pair Production in Hadronic Collisions at Order Alpha s written by and published by . This book was released on 1999 with total page 25 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present cross sections for production of electroweak vector boson pairs, WW, WZ and ZZ, in p{bar p} and pp collisions, at next-to-leading order in [alpha]{sub s}. We treat the leptonic decays of the bosons in the narrow-width approximation, but retain all spin information via decay angle correlations. We also include the effects of WWZ and WW[gamma] anomalous couplings.
Download or read book Scalar Boson Decays to Tau Leptons written by Cécile Caillol and published by Springer. This book was released on 2017-11-15 with total page 282 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents a study of the scalar sector in the standard model (SM), as well as various searches for an extended scalar sector in theories beyond the SM (BSM). The first part of the thesis details the search for an SM Higgs boson decaying to taus, and produced by gluon fusion, vector boson fusion, or associated production with a vector boson, leading to evidence for decays of the Higgs boson to taus. In turn, the second part highlights several searches for an extended scalar sector, with scalar boson decays to taus. In all of the analyses presented, at least one scalar boson decays to a pair of taus. The results draw on data collected by the Compact Muon Solenoid (CMS) detector during proton–proton collisions with a center-of-mass energy of 7 or 8 TeV.
Download or read book Top Pair Production in the Dilepton Decay Channel with a Tau Lepton written by and published by . This book was released on 2012 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt: The top quark pair production and decay into leptons with at least one being a [tau] lepton is studied in the framework of the CDF experiment at the Tevatron proton antiproton collider at Fermilab (USA). The selection requires an electron or a muon produced either by the [tau] lepton decay or by a W decay. The analysis uses the complete Run II data set i.e. 9.0 fb-1, selected by one trigger based on a low transverse momentum electron or muon plus one isolated charged track. The top quark pair production cross section at 1.96 TeV is measured at 8.2 ± 1.7+1.2-1.1 ± 0.5 pb, and the top branching ratio into [tau] lepton is measured at 0.120 ± 0.027+0.022 -0.019 ± 0.007 with statistical, systematics and luminosity uncertainties. These are up to date the most accurate results in this top decay channel and are in good agreement with the results obtained using other decay channels of the top at the Tevatron. The branching ratio is also measured separating the single lepton from the two leptons events with a log likelihood method. This is the first time these two signatures are separately identified. With a fit to data along the log-likelihood variable an alternative measurement of the branching ratio is made: 0.098 ± 0.022(stat:) ± 0.014(syst:); it is in good agreement with the expectations of the Standard Model (with lepton universality) within the experimental uncertainties. The branching ratio is constrained to be less than 0.159 at 95% con dence level. This limit translates into a limit of a top branching ratio into a potential charged Higgs boson.
Download or read book Measurement of Vector Boson Pair Production Using Hadronic Decays of High Transverse Momentum W and Z Bosons at the ATLAS Detector written by David Peter Wallis Freeborn and published by . This book was released on 2016 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of Tt Production Cross Section in Pp Collisions at square Root S written by Harpreet Singh and published by . This book was released on 1999 with total page 418 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Search for Exotic Diboson Production in the Semileptonic Channels with the ATLAS Detector written by Robert Les and published by . This book was released on 2020 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis presents several studies in the search for new physics in the production of electroweak gauge bosons pairs with 36 $fb^{-1}$ of proton-proton collisions measured by the ATLAS detector. Processes with electroweak gauge bosons in the final state are sensitive to new physics which alter the electroweak or Higgs sector of the Standard Model. The studies are conducted in the ``semileptonic" decay channels, where one of the electroweak gauge bosons decays hadronically and the other decays leptonically. The groundwork of these studies is established in a search for a new resonant particle which can decay on-shell to pairs of $W/Z$ bosons in the $\ell\nu qq$ channel. No significant excess of data with respect to the background prediction was observed. Therefore, upper limits at the 95\% CLs confidence level are placed on the possible resonant masses in a strongly coupled Heavy Vector Triplet model and on Bulk Randall-Sundrum Gravitons at 3 TeV and 1.7 TeV, respectively. These results are expanded upon with a dedicated study on an ATLAS-wide combination of resonant diboson and dilepton search results. The combination improves the 95\% CLs upper excluded mass values to 5.5 TeV and 2.1 TeV, respectively. In conjunction, a search for non-resonant new physics is conducted through a measurement of the electroweak vector-boson scattering in all semileptonic channels. Evidence for the process was observed at a significance of $2.7\sigma$ and a fiducial cross-section measurement of $\sigma=45.1\pm8.6\,(\mathrm{stat.})^{+15.9}_{-14.6} \,(\mathrm{syst.})$ fb was extracted, consistent with the Standard Model prediction. Lastly, both the prospects of the $\ell\nu qq$ resonance search and the measurement of vector-boson scattering in the High-Luminosity LHC era were evaluated. With 3000 $fb^{-1}$ of proton-proton data, the upper mass limits on new resonances in the $\ell\nu qq$ channel are expected to increase by 1.3 - 2 TeV depending on the benchmark model and the vector-boson scattering cross-section is expected to be measured at the percent level.
Download or read book Measurement of Di photon Induced Production of W Boson Pairs and Limits on Anomalous Quartic Gauge Couplings written by Chav Chhiv Chau and published by . This book was released on 2017 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Extension of the Standard model can enhance the interactions between four vector bosons, so the couplings deviate from their predicted value due to new quartic-gauge-boson interactions. Searches for those deviations are model-independent and cover a wide range of possible new physics. This thesis describes the measurement of exclusive production of W-boson pairs and the search for WW\gamma\gamma anomalous quartic gauge couplings at the Large Hadron Collider (LHC) using a data set corresponding to 20.2 fb-1 of proton-proton collisions collected by the ATLAS detector in 2012. This analysis considers the W+W- decay modes leading to e\mu leptons. At the LHC, exclusive interactions are characterized by the absence of additional activity in the vicinity of interaction vertices. A technique based on tracks was developed to select the exclusive event candidates. The technique accepts approximately 60% of the signal, while eliminates most of the background due to suppression by 3--4 orders of magnitude. Additional background reduction is achieved by rejecting the region pT^{e\mu}
Download or read book Measurement of Vector Boson Pair Production Using Hadronic Decays of High Transverse Momentum W and Z Bosons at the ATLAS Detector written by D. P. W. Freeborn and published by . This book was released on 2016 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observations and Measurement of W Boson Production and Triple Gauge Couplings at LEP II written by Yoshi Uchida and published by . This book was released on 2001 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: W-Pair and Single-W production events are observed at LEP, the Large Electron Positron collider at CERN, using the L3 detector. All decay channels are considered, and data taken in the years 1998 and 1999, with electron-positron collision centre-of-mass energies from 189 GeV to 202 GeV are analysed. The integrated luminosity of the analysed data corresponds to approximately 400pb-1, and a total of approximately 5000 W-pair events and 100 single-W events are selected. The observed cross sections of these W production processes and the differential distributions of the event shapes are then used to measure the couplings of Wbosons with Z bosons and photons. Emphasis is placed on the unambiguous and efficient combination of the information from the different production and decay channels. For the couplings in the model in which gauge invariance is realised linearly, the following results are obtained ... where the errors shown are statistical, systematic and theoretical respectively. All results show consistency with expectations from the Standard Model.
Download or read book Vector Boson Pair Production in E collisions with Polarized Beams written by P. Helde and published by . This book was released on 1994 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
