Abstract
We present results on the system size dependence of high transverse momentum di-hadron correlations at sqrt(sN N) = 200 GeV as measured by STAR at RHIC. Measurements in d + Au, Cu + Cu and Au + Au collisions reveal similar jet-like near-side correlation yields (correlations at small angular separation - Δ φ{symbol} ∼ 0, Δ η ∼ 0) for all systems and centralities. Previous measurements have shown that the away-side (Δ φ{symbol} ∼ π) yield is suppressed in heavy-ion collisions. We present measurements of the away-side suppression as a function of transverse momentum and centrality in Cu + Cu and Au + Au collisions. The suppression is found to be similar in Cu + Cu and Au + Au collisions at a similar number of participants. The results are compared to theoretical calculations based on the parton quenching model and the modified fragmentation model. The observed differences between data and theory indicate that the correlated yields presented here will further constrain dynamic energy loss models and provide information about the dynamic density profile in heavy-ion collisions.
| Original language | English |
|---|---|
| Pages (from-to) | 123-128 |
| Number of pages | 6 |
| Journal | Physics Letters B |
| Volume | 683 |
| Issue number | 2-3 |
| DOIs | |
| State | Published - Jan 18 2010 |
| Externally published | Yes |
Funding
We thank the RHIC Operations Group and RCF at BNL, and the NERSC Center at LBNL and the resources provided by the Open Science Grid consortium for their support. This work was supported in part by the Offices of NP and HEP within the US DOE Office of Science , the US NSF , the Sloan Foundation , the DFG cluster of excellence ‘Origin and Structure of the Universe’ , CNRS/IN2P3 , RA , RPL , and EMN of France , STFC and EPSRC of the United Kingdom , FAPESP of Brazil , the Russian Ministry of Sci. and Tech. , the NNSFC , CAS , MoST , and MoE of China , IRP and GA of the Czech Republic , FOM of the Netherlands , DAE , DST , and CSIR of the Government of India , the Polish State Committee for Scientific Research , and the Korea Sci. & Eng. Foundation .
| Funders | Funder number |
|---|---|
| EMN | |
| MOE of China | |
| Polish State Committee for Scientific Research | |
| Russian Ministry of Sci | |
| National Science Foundation | |
| Alfred P. Sloan Foundation | |
| Office of Science | |
| Engineering and Physical Sciences Research Council | |
| Science and Technology Facilities Council | PP/F001061/1 |
| Science and Technology Facilities Council | |
| Department of Science and Technology, Ministry of Science and Technology, India | |
| Council of Scientific and Industrial Research, India | |
| Department of Atomic Energy, Government of India | |
| Deutsche Forschungsgemeinschaft | |
| International Foundation for Research in Paraplegia | |
| Fundação de Amparo à Pesquisa do Estado de São Paulo | |
| National Natural Science Foundation of China | |
| Chinese Academy of Sciences | |
| Ministry of Science and Technology, Taiwan | |
| Centre National de la Recherche Scientifique | |
| Institut National de Physique Nucléaire et de Physique des Particules |
Keywords
- Di-hadron fragmentation function
- Jet quenching
- Parton energy loss
- Relativistic heavy-ion collisions