Download or read book A Limit on the Branching Ratio of the Flavor changing Top Quark Decay T right Pointing Arrow ZC written by Alexander A. Paramonov and published by . This book was released on 2009 with total page 206 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book A Limit on the Branching Ratio of the Flavor Changing Top Quark Decay T Zc written by and published by . This book was released on 2009 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have used the Collider Detector at Fermilab (CDF-II) to set upper limits on the branching ratio of the flavor-changing neutral-current (FCNC) top quark decay t 2!Zc using a technique employing ratios of W and Z production, measured in 1.52 fb−1 of p{bar p} data. The analysis uses a comparison of two decay chains, p{bar p} 2!t{bar t} 2!WbWb 2!l[nu]bjjb and p{bar p} 2!t{bar t} ZcWb 2!ll− cjjb, to cancel systematic uncertainties in acceptance, efficiency, and luminosity. We validate the MC modeling of acceptance and efficiency for lepton identification over the multi-year dataset also using a ratio of W and Z production, in this case the observed ratio of inclusive production of W to Z-bosons, a technique that will be essential for precision comparisons with the standard model at the LHC. We introduce several methods of determining backgrounds to the W and Z samples. To improve the discrimination against SM backgrounds to top quark decays, we calculate the top mass for each event with two leptons and four jets assuming it is a t{bar t} event with one of the top quarks decaying to Zc. The upper limit on the Br(t 2!Zc) is estimated from a likelihood constructed with the ll− cjjb top mass distribution and the number of l[nu]bjjb events. Limits are set as a function of the helicity of the Z-boson produced in the FCNC decay. For 100%-longitudinally-polarized Z-bosons we find a limit of 8.3% (95% C.L.).
Download or read book A Limit on the Branching Ratio of the Flavor Changing Top Quark Decay T u2192 Zc written by and published by . This book was released on 2009 with total page 119 pages. Available in PDF, EPUB and Kindle. Book excerpt: We have used the Collider Detector at Fermilab (CDF-II) to set upper limits on the branching ratio of the flavor-changing neutral-current (FCNC) top quark decay t → Zc using a technique employing ratios of W and Z production, measured in 1.52 fb-1 of p$ar{p}$ data. The analysis uses a comparison of two decay chains, p$ar{p}$ → t$ar{t}$ → WbWb → lvbjjb and p$ar{p}$ → t$ar{t}$ ZcWb → l+l- cjjb, to cancel systematic uncertainties in acceptance, efficiency, and luminosity. We validate the MC modeling of acceptance and efficiency for lepton identification over the multi-year dataset also using a ratio of W and Z production, in this case the observed ratio of inclusive production of W to Z-bosons, a technique that will be essential for precision comparisons with the standard model at the LHC. We introduce several methods of determining backgrounds to the W and Z samples. To improve the discrimination against SM backgrounds to top quark decays, we calculate the top mass for each event with two leptons and four jets assuming it is a t$ar{t}$ event with one of the top quarks decaying to Zc. The upper limit on the Br(t → Zc) is estimated from a likelihood constructed with the l+l- cjjb top mass distribution and the number of lvbjjb events. Limits are set as a function of the helicity of the Z-boson produced in the FCNC decay. For 100%-longitudinally-polarized Z-bosons we find a limit of 8.3% (95% C.L.).
Download or read book Search for the Neutral Current Top Quark Decay T Zc Using the Ratio of Z boson 4 Jets to W boson 4 Jets Production written by and published by . This book was released on 2009 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Verslag en aanbevelings van die komitee van ondersoek na moontlike verdere fasiliteite vir geneeskundige en tandheelkundige opleiding written by and published by . This book was released on 1984 with total page 195 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Search for Flavor changing Neutral Current Top Quark Decays T Hq with H Bb in Pp Collisions at square Root Of 2 written by Shota Tsiskaridze and published by . This book was released on 2015 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book B K Decays and Novel Flavor Factories written by David Cline and published by American Institute of Physics. This book was released on 1992 with total page 280 pages. Available in PDF, EPUB and Kindle. Book excerpt: From a February 1991 conference in Santa Monica, California, 22 papers by particle, theoretical, and accelerator physicists discuss flavor physics and novel flavor factories (aspects of the subatomic world). CP violation and the search for flavor-changing weak neutral currents are covered extensivel
Download or read book Measurement of the Ratio of Top quark Branching Fractions beta t arrow Wb beta t arrow Wq in the Lepton jets and Dilepton Channels at the Collider Detector at Fermilab written by Dmitri Vitalievich Smirnov and published by . This book was released on 2005 with total page 358 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Observation of the Branching Ratio of the Decay K subscript L 0 arrow Leads to Right Mu mu written by Eric Lee Schwartz and published by . This book was released on 1974 with total page 85 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Probing the Flavor Changing Vertex of the Top quark written by and published by . This book was released on 1991 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Probing the Flavor Changing Vertex of the Top quark written by and published by . This book was released on 1991 with total page 4 pages. Available in PDF, EPUB and Kindle. Book excerpt: The implications of the flavor changing neutral current vertex, t 2!cX, where X = [gamma], g, Z, or H is examined in the Standard and two-Higgs-doublet models. 9 refs., 3 figs.
Download or read book Up Sector of Minimal Flavor Violation written by and published by . This book was released on 2013 with total page 27 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book An Improved Upper Limit on the Branching Ratio of the Decay K Pi m U e written by Hanh D. Do and published by . This book was released on 2000 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Stringent Limits on the Branching Ratios for the Decays K0 subscript L right Arrow mu E E E superscript Plus minus mu Superscript Minus plus written by Henry Jonathan Frisch and published by . This book was released on 1971 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Dark Decay of Top Quark written by and published by . This book was released on with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We suggest top quark decays as a venue to search for light dark force carriers. Top quark is the heaviest particle in the standard model whose decays are relatively poorly measured, allowing sufficient room for exotic decay modes from new physics. A very light (GeV scale) dark gauge boson (Z') is a recently highlighted hypothetical particle that can address some astrophysical anomalies as well as the 3.6 [sigma] deviation in the muon g-2 measurement. We present and study a possible scenario that top quark decays as t → b W + Z's. This is the same as the dominant top quark decay (t → b W) accompanied by one or multiple dark force carriers. The Z' can be easily boosted, and it can decay into highly collimated leptons (lepton-jet) with large branching ratio. We discuss the implications for the Large Hadron Collider experiments including the analysis based on the lepton-jets.
Download or read book Search for Flavor Changing Neutral Current Decays of the Top Quark in P anti P Collisions at square Root S written by and published by . This book was released on 1997 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Top Quark Mass Spectrum from Flavor changing Processes written by and published by . This book was released on 1990 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: The input from flavor-changing processes is reviewed and results of several analyses are presented on the top quark mass spectrum without recourse to the neutral-current data. A top quark mass in the range 135 {plus minus} 25 GeV is much preferred, but a very massive top quark above 300 GeV can not be ruled out. Comments are made about the future use of the inclusive decay B → [gamma] + X{sub S=1} for constraining the top quark mass. 24 refs., 2 figs.
