Using Spin Correlations to Distinguish Zh from ZA at the International Linear Collider Page: 3 of 48
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f
e
Z Z
FIG. 1: The Feynman diagram for the production and decay of a Higgs boson (46) in association
with a Z boson.
spin state of the Z, we can learn about the Higgs in a model-independent fashion. Since
we understand Z decays very well (see, for example, the review of Z physics contained in
Ref. [6]), any deviations from Standard Model predictions will point to new physics in the
Higgs sector.
Traditionally, angular correlations have been studied within the context provided by the
helicity basis. For a light Higgs and a linear collider running at a full TeV or so, this is
appropriate. However, in situations where the Z boson and Higgs are not ultra-relativistic,
the helicity basis may not give the most useful description of the physics involved. Instead,
it is fruitful to explore other choices of spin axis [7, 8, 9, 10, 11]. One framework which
facilitates this exploration in a fairly straightforward manner is the generic spin basis (-
basis) introduced by Parke and Shadmi in Ref. [8]. One possibility that this framework
allows for is the analysis of the data (or independent subsets thereof) in two (or more)
different ways, to see if the spin content of the Z bosons varies with in the predicted
manner.
Spin correlations in associated Higgs production at a hadron collider (qq' -> W#) have
already been studied in Ref. [11]. Angular correlations are most easily observed and un-
derstood in the zero momentum frame of the event. At a hadron collider, however, the z
component of the total momentum in the event is ambiguous, making the zero momentum
frame difficult to find. We have written this paper from the point-of-view of a future e+e-
linear collider to utilize the advantages offered by such a machine. Not only is the zero
momentum frame relatively well-known in this case, but the ability to polarize the beams
enhances the angular correlations.3
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Mahlon, Gregory & Parke, Stephen J. Using Spin Correlations to Distinguish Zh from ZA at the International Linear Collider, article, June 1, 2006; Batavia, Illinois. (https://digital.library.unt.edu/ark:/67531/metadc887762/m1/3/: accessed April 23, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.