Engineering Papers⌕ Search

SEARCH · Engineering Papers

Results for “element”

Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.

Quote a phrase for an exact phrase match. Source license links do not imply unrestricted reuse.

At least 361 records · Page 20
All sourcesNASA NTRSDOE OSTI
DOE OSTI2015

Tevatron combination of single-top-quark cross sections and determination of the magnitude of the Cabibbo-Kobayashi-Maskawa matrix element $\bf V_{tb}$

In this study, we present the final combination of CDF and D0 measurements of cross sections for single-top-quark production in proton-antiproton collisions at a center-of-mass energy of 1.96 TeV. The data correspond to total integrated luminosities of up to 9.7 fb -1 per experiment. The t-channel cross section is measured to be σ t = 2.25$+0.29\atop{-0.31}$ pb. We also present the combinations of the two-dimensional measurements of the s- vs t-channel cross section. In addition, we give the combination of the s+t channel cross section measurement resulting in σ s+t = 3.30$+0.52\atop{-0.40}$ pb, without assuming the standard model value for the ratio σ s /σ t . The resulting value of the magnitude of the top-to-bottom quark coupling is |V tb |= 1.02$+0.06\atop{-0.05}$, corresponding to |V tb | > 0.92 at the 95% C.L.

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS↗