Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations
Charged-particle spectra associated with direct photon (γdir) and pi0 are measured in p+p and Au+Au collisions at center-of-mass energy [sqrt]sNN=200 GeV with the STAR detector at the Relativistic Heavy Ion Collider. A shower-shape analysis is used to partially discriminate between γdir and pi0. Ass...
| Main Authors: | , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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American Physical Society
2011
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| Online Access: | http://hdl.handle.net/1721.1/60666 https://orcid.org/0000-0002-5515-4563 https://orcid.org/0000-0001-5839-707X https://orcid.org/0000-0002-0031-1963 https://orcid.org/0000-0002-9107-6312 |
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| author | Balewski, Jan T. Betancourt, Michael Joseph Corliss, Ross Cameron Jones, Christopher LaDon Kocoloski, Adam Philip Leight, William Axel Sakuma, Tai Surrow, Bernd Hoffman, Alan Michael Milner, Richard G Redwine, Robert P van Nieuwenhuizen, Gerrit J Walker, Matthew H |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Balewski, Jan T. Betancourt, Michael Joseph Corliss, Ross Cameron Jones, Christopher LaDon Kocoloski, Adam Philip Leight, William Axel Sakuma, Tai Surrow, Bernd Hoffman, Alan Michael Milner, Richard G Redwine, Robert P van Nieuwenhuizen, Gerrit J Walker, Matthew H |
| author_sort | Balewski, Jan T. |
| collection | MIT |
| description | Charged-particle spectra associated with direct photon (γdir) and pi0 are measured in p+p and Au+Au collisions at center-of-mass energy [sqrt]sNN=200 GeV with the STAR detector at the Relativistic Heavy Ion Collider. A shower-shape analysis is used to partially discriminate between γdir and pi0. Assuming no associated charged particles in the γdir direction (near side) and small contribution from fragmentation photons (γfrag), the associated charged-particle yields opposite to γdir (away side) are extracted. In central Au+Au collisions, the charged-particle yields at midrapidity (|η|<1) and high transverse momentum (3<pT[superscript assoc]<16 GeV/c) associated with γdir and pi0 (|η|<0.9, 8<pT[superscript trig]<16 GeV/c) are suppressed by a factor of 3–5 compared with p+p collisions. The observed suppression of the associated charged particles is similar for γdir and pi0 and independent of the γdir energy within uncertainties. These measurements indicate that, in the kinematic range covered and within our current experimental uncertainties, the parton energy loss shows no sensitivity to the parton initial energy, path length, or color charge. |
| first_indexed | 2024-09-23T16:05:01Z |
| format | Article |
| id | mit-1721.1/60666 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T16:05:01Z |
| publishDate | 2011 |
| publisher | American Physical Society |
| record_format | dspace |
| spelling | mit-1721.1/606662023-02-26T08:17:53Z Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations Balewski, Jan T. Betancourt, Michael Joseph Corliss, Ross Cameron Jones, Christopher LaDon Kocoloski, Adam Philip Leight, William Axel Sakuma, Tai Surrow, Bernd Hoffman, Alan Michael Milner, Richard G Redwine, Robert P van Nieuwenhuizen, Gerrit J Walker, Matthew H Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Milner, Richard G. Balewski, Jan T. Betancourt, Michael Joseph Corliss, Ross Cameron Hoffman, A. M. Jones, Christopher LaDon Kocoloski, Adam Philip Leight, William Axel Milner, Richard G. Redwine, Robert P. Sakuma, Tai Surrow, Bernd van Nieuwenhuizen, Gerrit Jan Walker, Matthew H. Charged-particle spectra associated with direct photon (γdir) and pi0 are measured in p+p and Au+Au collisions at center-of-mass energy [sqrt]sNN=200 GeV with the STAR detector at the Relativistic Heavy Ion Collider. A shower-shape analysis is used to partially discriminate between γdir and pi0. Assuming no associated charged particles in the γdir direction (near side) and small contribution from fragmentation photons (γfrag), the associated charged-particle yields opposite to γdir (away side) are extracted. In central Au+Au collisions, the charged-particle yields at midrapidity (|η|<1) and high transverse momentum (3<pT[superscript assoc]<16 GeV/c) associated with γdir and pi0 (|η|<0.9, 8<pT[superscript trig]<16 GeV/c) are suppressed by a factor of 3–5 compared with p+p collisions. The observed suppression of the associated charged particles is similar for γdir and pi0 and independent of the γdir energy within uncertainties. These measurements indicate that, in the kinematic range covered and within our current experimental uncertainties, the parton energy loss shows no sensitivity to the parton initial energy, path length, or color charge. United States. Dept. of Energy. Office of Science National Science Foundation (U.S.) Alfred P. Sloan Foundation Deutsche Forschungsgemeinschaft (DFG) Institut National de Physique Nucleaire et Physique des Particules/CNRS Engineering and Physical Sciences Research Council Conselho Nacional de Pesquisas (Brazil) Fundação de Amparo à Pesquisa do Estado de São Paulo Ministry of Education and Science of the Russian Federation National Natural Science Foundation of China (NSFC) Chinese Academy of Sciences MoST of China MoE of China GA of the Czech Republic MSMT of the Czech Republic FOM of the Netherlands NWO of the Netherlands DST of the Government of India India. Dept. of Atomic Energy Council of Scientific & Industrial Research (India) Polish Ministry of Science and Higher Education Korean Research Foundation Ministry of Science, Education and Sports of the Republic of Croatia Russian Ministry of Science and Technology RosAtom of Russia 2011-01-19T18:36:34Z 2011-01-19T18:36:34Z 2010-12 2010-09 Article http://purl.org/eprint/type/JournalArticle 0556-2813 http://hdl.handle.net/1721.1/60666 STAR Collaboration et al. “Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations.” Physical Review C 82.3 (2010): 034909. © 2010 The American Physical Society. https://orcid.org/0000-0002-5515-4563 https://orcid.org/0000-0001-5839-707X https://orcid.org/0000-0002-0031-1963 https://orcid.org/0000-0002-9107-6312 en_US http://dx.doi.org/10.1103/PhysRevC.82.034909 Physical Review C Article is made available in accordance with the publisher's policy and may be subject to US copyright law. Please refer to the publisher's site for terms of use. application/pdf American Physical Society APS |
| spellingShingle | Balewski, Jan T. Betancourt, Michael Joseph Corliss, Ross Cameron Jones, Christopher LaDon Kocoloski, Adam Philip Leight, William Axel Sakuma, Tai Surrow, Bernd Hoffman, Alan Michael Milner, Richard G Redwine, Robert P van Nieuwenhuizen, Gerrit J Walker, Matthew H Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations |
| title | Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations |
| title_full | Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations |
| title_fullStr | Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations |
| title_full_unstemmed | Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations |
| title_short | Parton energy loss in heavy-ion collisions via direct-photon and charged-particle azimuthal correlations |
| title_sort | parton energy loss in heavy ion collisions via direct photon and charged particle azimuthal correlations |
| url | http://hdl.handle.net/1721.1/60666 https://orcid.org/0000-0002-5515-4563 https://orcid.org/0000-0001-5839-707X https://orcid.org/0000-0002-0031-1963 https://orcid.org/0000-0002-9107-6312 |
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