| DATE: |
2006-04-25 13:30 - 14:30 |
| PLACE: |
Kenkyu Honkan Rm. 321 |
| TITLE: |
Forward pion production in dAu collisions at RHIC and interplay of soft and hard dynamics for recoil jets |
| CONTACT: |
tsuda |
| SPEAKER: |
Prof. Mark Strikman (Pennsylvania State University) |
| LANGUAGE: |
English |
| ABSTRACT: |
We study production of hadrons at central rapidities for pA (dA) collisions with the forward high $p_t$ trigger. We argue that the STAR data prefer the dominance of peripheral mechanisms of the production of the very forward $\pi0$'s and a lack of suppression of hadrons in the recoil jet kinematics in the hard subprocess for the $\pi0$ trigger with $p_t^{\pi} \sim 1.3 \, GeV/c$. Our conclusion is consistent with the findings of PHENIX at smaller rapidities. The observed pattern is consistent with onset of the regime of large energy losses at the central impact parameters natural in the black disk limit. At the same time it appears to be in variance with predictions of the CGC model. A possible sensitivity of the discussed processes to the presence of color fluctuations in nucleons is explained. New observables are suggested which would allow improved separation between hard and soft contributions and hence would measure more accurately possible modifications of the rates of hard subprocesses, color transparency effects, etc.
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