[DIRC] High PT kaons

[hyde at jlab.org]

Hello,
Here is a draft paragraph on why we want high P_T kaon ID.
(or maybe this is an argument that 4 GeV/c is enough?)

Photo and electroproduction a pair of back-to-back high P_T hadrons is one
of the most successful channels in the COMPASS experiment
for determining the polarized gluon distribution.

As x_B increases, the photon-gluon fusion process has an
increasing background from the QCD compton process on valence
and sea quarks.    However, if a K K-bar pair is detected
at high P_T, the selectivity for gluons remains strong,
including in both the region of chiral symmetry breaking
x=0.01~0.1 and the valence region x>0.1.
Over this whole x range, the kaon pair will predominantly be
in the central region of an EIC detector.

Factorization in this process is determined by the invariant mass
of the KK-bar pair.  Kaon ID up to 4 GeV/c sets a scale of roughly 30
GeV2.  Extending the Kaon ID range up to 6 GeV/c will extend
this range 70 GeV2.  Even this extreme mass scale is within the
kinematic reach of a 6x60 GeV^2 collider, and is well below the
kinematic reach of a 11x90 GeV^2 collider

Photo and electroproduction
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