7,861 research outputs found
Deci-weak at Tevatron and LHC
Recently Tevatron released their measurements on invariant mass spectrum of
electron/positron, as well as the di-jet arising from WW+WZ production with one
W leptonically decay. Though the statistics is not significant, there are two
bumps around 240 GeV and 120-160 GeV respectively. We proposed that the two
bumps correspond to the extra light gauge bosons and ,
which couple with quarks with the deci-weak strength. In this brief report, we
also simulated di-jet invariant mass distribution at the current running LHC.Comment: 8 pages, 3 EPS figures, ref added, figures update
New Color-Octet Vector Boson Revisit
Motivated by CDF recent measurements on di-jet invariant mass spectrum where
di-jet is associated production with charged leptons () and missing
energy, we re-examine the previous proposed massive color-octet
axial-vector-like boson . Our simulation showed that the di-jet bump
around 120-160 GeV can be induced by with effective coupling (q represents the quark other than top and is the
strong coupling constant). Moreover our numerical investigation indicated that
the top quark forward-backward asymmetry can be reproduced without
distorting shape of differential cross section ,
provided that the and top quark coupling is appropriately chosen (). Our results also showed that the
theoretical as functions of and can be
consistent with data within and respectively.Comment: 8 pages, 3 EPS figure
One-side Forward-backward Asymmetry in Top Quark Pair Production at CERN Large Hadron Collider
Both D0 and CDF at Tevatron reported the measurements of forward-backward
asymmetry in top pair production, which showed possible deviation from the
standard model QCD prediction. In this paper, we explore how to examine the
{\em same} higher-order QCD effects at the more powerful Large Hadron Collider.Comment: 4 pages, 6 figures, Refs added, published versio
GC/MS ANALYSIS OF COAL TAR COMPOSITION PRODUCED FROM COAL PYROLYSIS
Coal tar is a significant product generated from coal pyrolysis. A detailed analytical study on its composition and chemical structure will be of great advantage to its further processing and utilization. Using a combined method of planigraphy-gas chromatograph/mass spectroscopy (GC/MS), this work presents a composition analysis on the coal tar generated in the experiment. The analysis gives a satisfactory result, which offers a referable theoretical foundation for the further processing and utilization of coal tar.
KEY WORDS: Coking-coals, Coal pyrolysis, Coal tar, GC/MS
Bull. Chem. Soc. Ethiop. 2007, 21(2), 229-240
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