Download or read book Limits on the Anomalous ZZ gamma and Z gamma gamma Couplings 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 performed a direct search for the anomalous ZZ[gamma] and Z[gamma][gamma] couplings by studying p[anti p][yields][ell][ell][gamma]+ X, ([ell]= e, [mu]) events at[radical]s= 1.8 TeV with the D0 detector at the Fermilab Tevatron Collider. A fit to the transverse energy spectrum of the photon in the signal events, based on the data set corresponding to an integrated luminosity of 14.3 pb[sup[minus]1] (13.7 pb[sup[minus]1]) for the electron (muon) channel, yields the following 95% confidence level limits on the anomalous CP-conserving ZZ[gamma] couplings:[vert-bar]h[sub 30][sup Z][vert-bar]
Download or read book Limits on the Anomalous ZZ and Z Gamma Couplings in Panti P Collisions at Radicals written by and published by . This book was released on 1995 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Study of Z Gamma Events and Limits on Anomalous Z Z Gamma and Z Gamma Gamma Couplings in P Anti p Collisions at S 1 2 written by and published by . This book was released on 2005 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a measurement of the Z[gamma] production cross section and limits on anomalous ZZ[gamma] and Z[gamma][gamma] couplings for form-factor scales of [Lambda] = 750 and 1000 GeV. The measurement is based on 138 (152) candidate events in the ee[gamma] ([mu][mu][gamma]) final state using 320 (290) pb−1 of p{bar p} collisions at √s = 1.96 TeV. The 95% C.L. limits on real and imaginary parts of individual anomalous couplings are
Download or read book Z Gamma Production and Limits on Anomalous Z Z Gamma and Z Gamma Gamma Couplings in Panti p Collisions at S 1 2 written by and published by . This book was released on 2007 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Z Gamma Nu Anti nu Gamma Cross Section and Limits on Anomalous Z Z Gamma and Z Gamma Gamma Couplings in P Anti p Collisions at S 1 2 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 first observation of the Z[gamma] →[nu]{bar [nu]}[gamma] process at the Tevatron at 5.1 standard deviations significance, based on 3.6 fb−1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron p{bar p} Collider at √s = 1.96 TeV. The measured Z[gamma] cross section multiplied by the branching fraction of Z → {nu}{bar {nu}} is 32 ± 9(stat. + syst.) ± 2(lumi.) fb for the photon E{sub T} > 90 GeV. It is in agreement with the standard model prediction of 39 ± 4 fb. We set the most restrictive limits on anomalous trilinear Z[gamma][gamma] and ZZ[gamma] gauge boson couplings at a hadron collider to date, with three constraints being the world's strongest.
Download or read book Measurement of the Z Gamma Nu Anti nu Gamma Cross Section and Limits on Anomalous Z Z Gamma and Z Gamma Gamma Couplings in P Anti p Collisions at S 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 first observation of the Z? →?{bar?}? process at the Tevatron at 5.1 standard deviations significance, based on 3.6 fb−1 of integrated luminosity collected with the D0 detector at the Fermilab Tevatron p{bar p} Collider at √s = 1.96 TeV. The measured Z? cross section multiplied by the branching fraction of Z → {nu}{bar {nu}} is 32 ± 9(stat. + syst.) ± 2(lumi.) fb for the photon E{sub T}> 90 GeV. It is in agreement with the standard model prediction of 39 ± 4 fb. We set the most restrictive limits on anomalous trilinear Z?? and ZZ? gauge boson couplings at a hadron collider to date, with three constraints being the world's strongest.
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Limits on the Anomalous ZZ and Z Couplings in P anti 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 authors performed a direct search for the anomalous ZZ? and Z?? couplings by studying p{anti p} → ll? + X, (l = e,?) events at √s = 1.8 TeV with the D0 detector at the Fermilab Tevatron Collider. A fit to the transverse energy spectrum of the photon in the signal events, based on the data set corresponding to an integrated luminosity of 14.3 pb−1 (13.7 pb−1) for the electron (muon) channel, yields the following 95% confidence level limits on the anomalous CP-conserving ZZ? couplings: {vert_bar}h30{sup Z}{vert_bar}
Download or read book Boson Pair Production and Triple Gauge Couplings written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The D0 and CDF Collaborations measure boson pair production including W[gamma], WW, WZ, ZZ and Z[gamma] production in p[anti p] collisions at[radical]s= 1800 GeV. New results, from direct measurements, are described including W[gamma], WW, and Z[gamma] production cross sections and limits on non-Standard Model triple gauge boson couplings. The limits on anomalous WW[gamma], WWZ, Z[gamma][gamma] and ZZ[gamma] couplings are the most restrictive available. Prospects for Run II are discussed.
Download or read book Search for Anomalous ZZ gamma and Z gamma gamma Couplings with written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: A direct test of the Standard Model by searching for anomalous ZZ[gamma] and Z[gamma][gamma] couplings is presented. The authors analyze p[bar p][yields] ll[gamma]+ X, (l= e, [mu]) events at[radical]s= 1.8 TeV with the D0d detector at the Fermilab Tevatron Collider. A fit to the transverse energy spectrum of the photon in the signal events, based on the data set corresponding to an integrated luminosity of 13.9 pb[sup[minus]1] (13.3 pb[sup[minus]1]) for the electron (muon) channel, yields the following 95% CL limits on the anomalous CP-conserving ZZ[gamma] couplings: -1.9
Download or read book Government Reports Announcements Index written by and published by . This book was released on 1996 with total page 784 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Projet de loi sur la creation d un Institut national de prevoymas Au Congr s international d Actuaci n de Berlin written by and published by . This book was released on 1906 with total page 21 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for ZZ and Z gamma Production in P barp Collisions at Sqrt s written by and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present a study of [mu][mu][mu][mu], eeee, and [mu][mu]ee events using 1 fb−1 of data collected with the D0 detector at the Fermilab Tevatron p{bar p} Collider at √s = 1.96 TeV. Requiring the lepton pair masses to be greater than 30 GeV, they observe one event, consistent with the expected background of 0.13 ± 0.03 events and with the predicted standard model ZZ and Z[gamma]* production of 1.71 ± 0.15 events. They set an upper limit on the ZZ and Z[gamma]* cross section of 4.4 pb at the 95% C.L. They also derive limits on anomalous neutral trilinear ZZZ and ZZ[gamma]* gauge couplings. The one-parameter 95% C.L. coupling limits with a form factor scale [Lambda] = 1.2 TeV are -0.28
Download or read book Measurement of W gamma and Z gamma Production in Pp Collisions at Sqrt s written by and published by . This book was released on 2011 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt: A measurement of W-gamma and Z-gamma production in proton-proton collisions at sqrt(s) = 7 TeV is presented. Results are based on a data sample recorded by the CMS experiment at the LHC, corresponding to an integrated luminosity of 36 inverse picobarns. The electron and muon decay channels of the W and Z are used. The total cross sections are measured for photon transverse energy>10 GeV and spatial separation from charged leptons in the plane of pseudorapidity and azimuthal angle>0.7, and with an additional dilepton invariant mass requirement of> 50 GeV for the Z-gamma process. The following cross section times branching fraction values are found: sigma(pp to W-gamma+X) B(W to lepton neutrino) = 56.3 +/- 5.0 (stat.) +/- 5.0 (syst.) +/- 2.3 (lumi.) pb and sigma(pp to Z-gamma+X) B}(Z to lepton lepton) = 9.4 +/- 1.0 (stat.) +/- 0.6 (syst.) +/- 0.4 (lumi.) pb. These measurements are in agreement with standard model predictions. The first limits on anomalous WW gamma, ZZ gamma, and Z gamma gamma trilinear gauge couplings at sqrt(s) = 7 TeV are set.
Download or read book Profil ou nouvelle description de la ville maritime port et havre de Dunquerque au comt de Flandre written by and published by . This book was released on with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Measurement of the Z gamma Production Cross Section in Pp Collisions at 8 TeV and Search for Anomalous Triple Gauge Boson Couplings written by and published by . This book was released on 2015 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: The cross section for the production of Z[gamma] in proton-proton collisions at 8 TeV is measured based on data collected by the CMS experiment at the LHC corresponding to an integrated luminosity of 19.5 fb−1. Events with an oppositely-charged pair of muons or electrons together with an isolated photon are selected. The differential cross section as a function of the photon transverse momentum is measured inclusively and exclusively, where the exclusive selection applies a veto on central jets. The observed cross sections are compatible with the expectations of next-to-next-to-leading-order quantum chromodynamics. Limits on anomalous triple gauge couplings of ZZ[gamma] and Z[gamma][gamma] are set that improve on previous experimental results obtained with the charged lepton decay modes of the Z boson.
