Download or read book Flavor Changing Neutral Currents in Ttbar Decays at D O written by and published by . This book was released on 2011 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We present a search for flavor changing neutral currents (FCNC) in decays of top quarks. The analysis is based on a search for t{bar t} → l'[nu]l{bar l} + jets (l,{ell}' = e, [mu]) final states using 4.1 fb−1 of integrated luminosity of p{bar p} collisions at √ s = 1.96 TeV. We extract limits on the branching ratio B(t → Zq) (q = u, c quarks), assuming anomalous tuZ or tcZ couplings. We do not observe any sign of such anomalous coupling and set a limit of B

Download or read book A Search for Flavor Changing Neutral Currents and Lepton Family Number Violation in Neutral Two body Charm Decays written by David Aaron Pripstein and published by . This book was released on 1997 with total page 292 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Search for Flavor Changing Neutral Currents Decays in T QZ at Centre of mass Energy of 13 TeV in CMS written by 林俊廷 and published by . This book was released on 2020 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Search for the Flavor Changing Neutral Current Decay T Zq at the Square Root Of S written by Jennifer Lindsay Gimmell and published by . This book was released on 2009 with total page 270 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 s 8 TeV with the ATLAS Detector written by Shota Tsiskaridze and published by Springer. This book was released on 2017-08-02 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: This PhD thesis focuses on the search for flavor-changing neutral currents in the decay of a top quark to an up-type quark (q = u, c) and the Standard Model Higgs boson, where the Higgs boson decays to bb. Further, the thesis presents the combination of this search for top quark pair events with other ATLAS searches – in the course of which the most restrictive bounds to date on tqH interactions were obtained. Following on from the discovery of the Higgs boson, it is particularly important to measure the Yukawa couplings of the Standard Model fermions; these parameters may provide crucial insights to help solve the flavor puzzle and may help reveal the presence of new physics before it is directly observed in experiments.

Download or read book Flavor Changing Neutral Current B Decays at BaBar written by and published by . This book was released on 2004 with total page 5 pages. Available in PDF, EPUB and Kindle. Book excerpt: Recent BaBar results on rare B decays involving flavour-changing neutral currents are presented. New measurements of the CP asymmetries in b 2!s[gamma] decays are reported as well as b 2!sll− branching ratio measurements.

Download or read book Heavy Flavor Decays of the Z0 and a Search for Flavor Changing Neutral Currents written by and published by . This book was released on 2004 with total page 289 pages. Available in PDF, EPUB and Kindle. Book excerpt: Presented here are the results of a direct search for flavor changing neutral currents via the rare process Z° → bs and a measurement of R{sub bs} = [Lambda](Z° → bs)/[Lambda](Z° → hadrons). Because the decays Z° → b{bar b} and Z° → c{bar c} contribute significant backgrounds to Z° → bs, simultaneous measurements of R{sub b} = [Lambda](Z° → b{bar b})/[Lambda](Z° → hadrons) and R{sub c} = [Lambda](Z° → c{bar c})/[Lambda](Z° → hadrons) were also made. The standard double tag technique was extended and self calibrating tags were used for s, c, and b quarks. These measurements were made possible by the unique capabilities of the SLAC Large Detector (SLD) at the Stanford Linear Accelerator Center (SLAC): The b and c tags relied upon the SLD's VXD3 307 megapixel CCD vertex detector for topological and kinematic reconstruction of the B and D decay vertices; the s tag identified K{sup {+-}} mesons using the particle identification capabilities of SLD's Cherenkov Ring Imaging Detector (CRID), and K{sub S}° mesons and [Lambda] hadrons by kinematic reconstruction of their decay vertices in SLD's 5120 channel central drift chamber (CDC) particle tracking system.

Download or read book A Search for Flavor Changing Neutral Currents and Lepton Family Number Violation in Neutral Two body Charm Decays written by and published by . This book was released on 2001 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This work presents a search for three rare/forbidden neutral charm decays, D[sup 0][yields][mu]e, D[sup 0][yields][mu][mu], and D[sup 0][yields] ee. This study was based on data collected in Experiment E789 at the Fermi National Accelerator Laboratory using 800 GeV/c proton-gold interactions. Two statistical analyses are presented, one with background subtraction and the other without background subtraction. No evidence is found for any of the decays and the following upper limits are presented at the 90% confidence level.

Download or read book Observation of the Baryonic Flavor Changing Neutral Current Decay Lambda b0 to Lambda mu mu written by and published by . This book was released on 2011 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report the first observation of the baryonic flavor-changing neutral current decay?{sub b}° →???− with 24 signal events and a statistical significance of 5.8 Gaussian standard deviations. This measurement uses a p{bar p} collisions data sample corresponding to 6.8 fb−1 at √s = 1.96 TeV collected by the CDF II detector at the Tevatron collider. The total and differential branching ratios for?{sub b}° →??+?− are measured. They find?(?{sub b}° →??+?−) = [1.73 ± 0.42(stat) ± 0.55(syst)] x 10−6. They also report the first measurement of the differential branching ratio of B{sub s}° →??+?− using 49 signal events. In addition, they report branching ratios for B+ → K+?+?−, B° → K°?+?− and B → K*(892)?+?− decays.

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 Search for Flavor Changing Neutral Currents K written by and published by . This book was released on 1988 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a search for the flavor-changing neutral-current decays K/sub L/° .-->. .pi.°ee/sup /minus//, K/sub L/° .-->. ee/sup /minus// and K/sub L/° .-->. .mu./sup +-/e/sup /minus plus//. Limits obtained for these processes are BR(K/sub L/° .-->. .pi.°e+e/sup /minus//) 3.2 x 10/sup /minus/7/, BR(K/sub L/° .--. e+e/sup /minus//) 1.2 x 10/sup /minus/9/, BR(K/sub L/° .--. .mu./sup +-/e/sup /minus plus//)

Download or read book Evidence for the Flavor Changing Neutral Current Decays B Kll and B K ll written by and published by . This book was released on 2003 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors present preliminary results from a search for the rare, flavor-changing neutral current decays B[yields] K[ell][sup+][ell][sup -] and B[yields] K*[ell][sup+][ell][sup -], where[ell][sup+][ell][sup -] is either an e[sup+]e[sup -] or[mu][sup+][mu][sup -] pair. The data sample comprises (84.4[+-] 0.9) x 10[sup 6][Upsilon](4S)[yields] B[bar B] decays (77.8 fb[sup -1]) collected with the BaBar detector at the PEP-II B Factory. For B[yields] K[ell][sup+][ell][sup -], they observe a signal with estimated significance of 4.4[sigma] and obtain[Beta](B[yields] K[ell][sup+][ell][sup -])= (0.78[sub -0.20-0.18][sup+0.24+0.11]) x 10[sup 06] (averaged over[ell]= e and[mu]). For B[yields] K*[ell][sup+][ell][sup -], they observe an excess of events over background with estimated significance of 2.8[sigma]. They obtain[Beta](B[yields] K*[ell][sup+][ell][sup -])= (1.68[sub -0.58][sup+0.68][+-] 0.28) x 10[sup -6] and the 90% C.L. upper limit[Beta](B[yields] K*[ell][sup+][ell][sup -])

Download or read book Search for Flavor Changing Neutral Current Decays of Charm Mesons written by Nicholas James Witchey and published by . This book was released on 1996 with total page 326 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Search for the Flavor Changing Neutral Current Decay D 1hn0 m63 1hn m63 571 mu mu with the HERA B Detector written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Search for Flavor changing Neutral Current and Lepton flavor Violating Decays of D sup 0 ell sup ell sup written by and published by . This book was released on 2004 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The authors report on a search for the flavor-changing neutral current decays D[sup 0] --> e[sup +]e[sup -] and D[sup 0] --> [mu][sup +][mu][sup -], and the lepton-flavor violating decay D[sup 0] --> e[sup [+-]][mu][sup [-+]]. The measurement is based on 122 fb[sup -1] of data collected by the BABAR detector at the PEP-II asymmetric e[sup +]e[sup -] collider. No evidence is found for any of the decays. The upper limits on the branching fractions, at the 90% confidence level, are 1.2 x 10[sup -6] for D[sup 0] --> e[sup +]e[sup -], 1.3 x 10[sup -6] for D[sup 0] --> [mu][sup +][mu][sup -], and 8.1 x 10[sup -7] for D[sup 0] --> e[sup [+-]][mu][sup [-+]].

Download or read book Updated Search for the Flavor Changing Neutral Current Decay D0 to mu mu written by and published by . This book was released on 2010 with total page 8 pages. Available in PDF, EPUB and Kindle. Book excerpt: We report on a search for the flavor-changing neutral-current decay D° →??− in p{bar p} collisions at √s = 1.96TeV using 360 pb−1 of integrated luminosity collected by the CDF II detector at the Fermilab Tevatron collider. A displaced vertex trigger selects long-lived D° candidates in the?+?−,?+?−, and K−?+ decay modes. We use the Cabibbo-favored D° → K−?+ channel to optimize the selection criteria in an unbiased manner, and the kinematically similar D° →?+?− channel for normalization. We set an upper limit on the branching fraction?(D° →?+?−)

Download or read book Search for Top Decays Through Flavor Changing Neutral Current Process T Z q in Pp Collisions at square Root s written by 李昀翰 and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: