1,979,772 research outputs found
Complete r-partite subgraphs of dense r-graphs
We determine how large r-partite graphs can be found in r-uniform graphs with
n vertices and Cn^r edges, where C is a slowly decreasing function of n. This
refines results of Erdos from 1964.Comment: 7 page
On the Value of R=\Gamma_h/\Gamma_l at LEP
We show that the present experimental LEP average R=\Gamma_h/\Gamma_l= 20.795
+- 0.040 is not unambiguous due to the presence of substantial systematic
effects which cannot be interpreted within gaussian statistics. We find by
Montecarlo simulation that the C.L. of the original LEP sample is only 3.8
\cdot 10^{-4}. We suggest that a reliable extimate of the true R-value is
20.60< R < 20.98 which produces only a very poor determination of the strong
coupling constant at the Z mass scale, 0.10< \alpha_s(M_z)< 0.15.Comment: 4 pages, LaTeX; Postscript file, compressed and uuencoded, availabl
Conformal blocks related to the R-R states in the \hat c =1 SCFT
We derive an explicit form of a family of four-point Neveu-Schwarz blocks
with external weights and arbitrary intermediate
weight. The derivation is based on a set of identities obeyed in the free
superscalar theory by correlation functions of fields satisfying Ramond
condition with respect to the bosonic (dimension 1) and the fermionic
(dimension 1/2) currents.Comment: 15 pages, no figure
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