Probing Quark Matter in the PHENIX Experiment at RHIC

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Presentation transcript:

Probing Quark Matter in the PHENIX Experiment at RHIC Saskia Mioduszewski In the presence of a dense strongly interacting medium, the scattered partons will undergo soft interactions, suffering energy loss and resulting in a suppression of the number of particles observed at large energies “Jet Quenching” Heavy Ion Collisions provide a means to heat and compress normal nuclear matter Goal is to create a new hot and dense form of matter -- deconfined quarks and gluons “Quark Gluon Plasma” (QGP)  Recreate a form of matter in the laboratory as existed in the early universe, directly after the Big Bang (before cooling). Benefit to society: understanding the origin of the universe Au+Au event in the PHENIX detector Relativistic Heavy Ion Collider Why Heavy Ion Collisions? Ordinary nuclear matter protons and neutrons Quark-Gluon Plasma quarks and gluons Heat and compress cone of particles “jet” proton How do we probe the collisions? Hard scatterings between partons (quarks/gluons) in nucleon-nucleon collisions produce jets of particles. A “jet” is a directed spray (or cone) of particles, which can have large energies measured by our detectors What is the effect of the QGP? Measurement in Au+Au Collisions “Control” Experiment: d+Au Collisions Conclusion: In Au+Au collisions, the number of particles produced at large energies is suppressed. In d+Au collisions, there is no suppression in the number of particles produced at large energies.  Suppression is due to the medium produced in Au+Au collisions (QGP?). We have produced very hot and dense matter in Au+Au collisions at RHIC! Nucleus + nucleus (Au+Au) collision Proton/deuteron + nucleus (d+Au) collision Central Au+Au * p+p scaled by Nbinary(central) We measure the number of particles vs. energy in Au+Au collisions and compare with the (scaled) number of particles in p+p collisions Large+Large vs. Small+Small We find that the number of particles produced at large energies in Au+Au collisions is suppressed relative to expectation. -- A new effect first observed at RHIC! d+Au: (Small+Large) No Produced medium R~1  no suppression observed suppression Au+Au: (Large+Large) Produced medium R ~ 0.2  factor 5 suppression in number of particles at large energies  “Jet Quenching”