Saskia Mioduszewski

1
Probing Quark Matter in the PHENIX Experiment at
RHIC
Saskia Mioduszewski
Control Experiment dAu Collisions
Measurement in AuAu Collisions
Conclusion In AuAu collisions, the number
of particles produced at large energies is
suppressed. In dAu collisions, there is no
suppression in the number of particles produced
at large energies. ? Suppression is due to
the medium produced in AuAu collisions
(QGP?). We have produced very hot and dense
matter in AuAu collisions at RHIC!

• Central AuAu
• pp scaled by Nbinary(central)

• We measure the number of
• particles vs. energy in
• AuAu collisions and
• compare with the (scaled)
• number of particles in pp
• collisions
• LargeLarge vs.
• SmallSmall
• We find that the number of
• particles produced at large
• energies in AuAu collisions
• is suppressed relative to
• expectation. -- A new effect
• first observed at RHIC!

dAu (SmallLarge) No Produced medium R1 ? no
suppression observed
suppression
AuAu (LargeLarge) Produced medium R 0.2 ?
factor 5 suppression in number of particles at
large energies ? Jet Quenching