9 research outputs found
Interjet Energy Flow/Event Shape Correlations
We identify a class of perturbatively computable measures of interjet energy
flow, which can be associated with well-defined color flow at short distances.
As an illustration, we calculate correlations between event shapes and the flow
of energy, Q_Omega, into an interjet angular region, Omega, in high-energy
two-jet e^+e^- -annihilation events. Laplace transforms with respect to the
event shapes suppress states with radiation at intermediate energy scales, so
that we may compute systematically logarithms of interjet energy flow. This
method provides a set of predictions on energy radiated between jets, as a
function of event shape and of the choice of the region Omega in which the
energy is measured. Non-global logarithms appear as corrections. We apply our
method to a continuous class of event shapes.Comment: 9 pages, 5 figures. Based on talk given by C.F. Berger at TH-2002,
International Conference on Theoretical Physics, Theme 2: "QCD, Hadron
dynamics, etc.", Paris, France, 2002. Slight changes to text, reference adde
Energy Flow in Interjet Radiation
We study the distribution of transverse energy, Q_Omega, radiated into an
arbitrary interjet angular region, Omega, in high-p_T two-jet events. Using an
approximation that emphasizes radiation directly from the partons that undergo
the hard scattering, we find a distribution that can be extrapolated smoothly
to Q_Omega=Lambda_QCD, where it vanishes. This method, which we apply
numerically in a valence quark approximation, provides a class of predictions
on transverse energy radiated between jets, as a function of jet energy and
rapidity, and of the choice of the region Omega in which the energy is
measured. We discuss the relation of our approximation to the radiation from
unobserved partons of intermediate energy, whose importance was identified by
Dasgupta and Salam.Comment: 26 pages, 8 eps figures. Revised to include a discussion of
non-global logarithm
Event Shape/Energy Flow Correlations
We introduce a set of correlations between energy flow and event shapes that
are sensitive to the flow of color at short distances in jet events. These
correlations are formulated for a general set of event shapes, which includes
jet broadening and thrust as special cases. We illustrate the method for
electron-positron annihilation dijet events, and calculate the correlation at
leading logarithm in the energy flow and at next-to-leading-logarithm in the
event shape.Comment: 43 pages, eight eps figures; minor changes, references adde