Quarkonium at STAR Page: 1 of 12
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ANL-HEP-CP-98-131
QUARKONIUM AT STAR
T. J. LeCOMPTE
High Energy Physics Division, Argonne National Laboratory 9700 S. Cass Avenue,
Argonne, IL 60439, USA
E-mail: lecompte@anl.gov
For the STAR Collaboration
I discuss some of STAR's expectations for reconstruction of J/1p, 4' x and T reso-
nances, and describe some of the planned measurements of production properties.
1 Introduction
Charmonium and bottomonium particles have a number of properties that
make them interesting subjects for study in relativistic heavy-ion collisions.
There are narrow states that decay with sizable electromagnetic branching
fractions to relatively unusual (and therefore easily visible) products. Because
the constituent quarks are heavy, they form non-relativistic bound states that
can easily be assigned JPC quantum numbers.
While the details of quarkonium production are still murky, that these
states are produced dominantly by gluon-gluon fusion is incontrovertible. So
the yield of these particles depends on the free gluon flux, anticipated to be
higher in a quark-gluon plasma (QGP) than ordinary nuclear matter. Addi-
tionally, in a quark-gluon plasma, the free color charges can act to screen the
attraction between the quark and antiquark, and this can serve to suppress
the J/Vb and other states. This suppression should be a function of the separa-
tion between quarks, so should vary among different states. Finally, there are
production models in which 3S1 states like the J/ arise from gluon fragmen-
tation, and where they carry nearly all of the momentum of the parent gluon.
If this turns out to be true, the pT spectrum of J/'s can be used to measure
energy loss in the nuclear medium.
2 Detector
The heart of the STAR detector is a large radius (2 m) Time Projection Cham-
ber (TPC) mounted inside a 0.5 T solenoidal magnet. The TPC measures
charged particle momenta to a resolution of
Ap :: 0.01PT
PT
1
Submitted to the Workshop on Quarkonium Production in The submitted manuscript has been authored
by a contractor of the U. S. Government
Relativistic Nuclear Collisions at the Institute for under contract No. W-31-109-ENG-38.
Accordingly, the U. S. Government retains
Nuclear Theory, Seattle, WA on May 11-15, 1998. nonexclusive, royalty-free license to publish
or reproduce the published form of this
contribution, or allow others to do so, for
U. S. Government purposes.
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LeCompte, T. J. Quarkonium at STAR, article, November 11, 1998; Illinois. (https://digital.library.unt.edu/ark:/67531/metadc619315/m1/1/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.