Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √s[subscript NN] =2.76 TeV
Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √s[subscript NN] = 2.76TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger ba...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Article |
| Language: | en_US |
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Springer-Verlag
2014
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| Online Access: | http://hdl.handle.net/1721.1/87670 https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0001-6332-5839 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0001-9236-6621 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-1136-6900 |
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| author | Apyan, Aram Busza, Wit Cali, Ivan Amos Chan, M. Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Ma, Teng Paus, Cristoph M. E. Ralph, Duncan Kelley Roland, Cristof E. Stephans, George S. F. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yoon, A. S. Zanetti, Marco Paus, Christoph M. E. Barbieri, Richard Alexander Bauer, Gerry P Dutta, Valentina Lee, Yen-Jie Levin, Andrew Michael Luckey Jr, P David Roland, Gunther M Stoeckli, Fabian Sumorok, Konstanty C Yang, Mingming Wyslouch, Victoria Roland, Christof E |
| author2 | Massachusetts Institute of Technology. Department of Physics |
| author_facet | Massachusetts Institute of Technology. Department of Physics Apyan, Aram Busza, Wit Cali, Ivan Amos Chan, M. Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Ma, Teng Paus, Cristoph M. E. Ralph, Duncan Kelley Roland, Cristof E. Stephans, George S. F. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yoon, A. S. Zanetti, Marco Paus, Christoph M. E. Barbieri, Richard Alexander Bauer, Gerry P Dutta, Valentina Lee, Yen-Jie Levin, Andrew Michael Luckey Jr, P David Roland, Gunther M Stoeckli, Fabian Sumorok, Konstanty C Yang, Mingming Wyslouch, Victoria Roland, Christof E |
| author_sort | Apyan, Aram |
| collection | MIT |
| description | Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √s[subscript NN] = 2.76TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 μb − 1. The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v [subscript 2] to v [subscript 6], are extracted as a function of particle transverse momentum. At higher transverse momentum, the v [subscript 2] harmonic becomes significantly smaller than the higher-order v [subscript n] (n ≥ 3). The p [subscript T]-averaged [subscript v] 2 and [subscript v] 3 are found to be equal within 2%, while higher-order v [subscript n] decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-by-event fluctuating initial conditions is also presented. |
| first_indexed | 2024-09-23T15:13:48Z |
| format | Article |
| id | mit-1721.1/87670 |
| institution | Massachusetts Institute of Technology |
| language | en_US |
| last_indexed | 2024-09-23T15:13:48Z |
| publishDate | 2014 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | mit-1721.1/876702023-02-26T08:16:18Z Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √s[subscript NN] =2.76 TeV Apyan, Aram Busza, Wit Cali, Ivan Amos Chan, M. Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Ma, Teng Paus, Cristoph M. E. Ralph, Duncan Kelley Roland, Cristof E. Stephans, George S. F. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yoon, A. S. Zanetti, Marco Paus, Christoph M. E. Barbieri, Richard Alexander Bauer, Gerry P Dutta, Valentina Lee, Yen-Jie Levin, Andrew Michael Luckey Jr, P David Roland, Gunther M Stoeckli, Fabian Sumorok, Konstanty C Yang, Mingming Wyslouch, Victoria Roland, Christof E Massachusetts Institute of Technology. Department of Physics Massachusetts Institute of Technology. Laboratory for Nuclear Science Massachusetts Institute of Technology. School of Science Apyan, Aram Barbieri, R. Bauer, Gerry P. Busza, Wit Cali, Ivan Amos Chan, M. Di Matteo, Leonardo Dutta, V. Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Lee, Y.-J. Levin, A. Luckey, P. David, Jr. Ma, Teng Paus, Christoph M. E. Ralph, Duncan Kelley Roland, Christof E. Roland, Gunther M. Stephans, George S. F. Stockli, Fabian Sumorok, Konstanty C. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yang, M. Yoon, A. S. Zanetti, Marco Zhukova, Victoria Azimuthal dihadron correlations of charged particles have been measured in PbPb collisions at √s[subscript NN] = 2.76TeV by the CMS collaboration, using data from the 2011 LHC heavy-ion run. The data set includes a sample of ultra-central (0-0.2% centrality) PbPb events collected using a trigger based on total transverse energy in the hadron forward calorimeters and the total multiplicity of pixel clusters in the silicon pixel tracker. A total of about 1.8 million ultra-central events were recorded, corresponding to an integrated luminosity of 120 μb − 1. The observed correlations in ultra-central PbPb events are expected to be particularly sensitive to initial-state fluctuations. The single-particle anisotropy Fourier harmonics, from v [subscript 2] to v [subscript 6], are extracted as a function of particle transverse momentum. At higher transverse momentum, the v [subscript 2] harmonic becomes significantly smaller than the higher-order v [subscript n] (n ≥ 3). The p [subscript T]-averaged [subscript v] 2 and [subscript v] 3 are found to be equal within 2%, while higher-order v [subscript n] decrease as n increases. The breakdown of factorization of dihadron correlations into single-particle azimuthal anisotropies is observed. This effect is found to be most prominent in the ultra-central PbPb collisions, where the initial-state fluctuations play a dominant role. A comparison of the factorization data to hydrodynamic predictions with event-by-event fluctuating initial conditions is also presented. United States. Dept. of Energy National Science Foundation (U.S.) Alfred P. Sloan Foundation 2014-06-06T13:29:06Z 2014-06-06T13:29:06Z 2014-02 2013-12 Article http://purl.org/eprint/type/JournalArticle 1029-8479 1126-6708 http://hdl.handle.net/1721.1/87670 Chatrchyan, S., V. Khachatryan, A. M. Sirunyan, A. Tumasyan, W. Adam, T. Bergauer, M. Dragicevic, et al. “Studies of Azimuthal Dihadron Correlations in Ultra-Central PbPb Collisions at √s[subscript NN] =2.76 TeV.” J. High Energ. Phys. 2014, no. 2 (February 2014). © CERN, for the benefit of the CMS Collaboration https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0001-6332-5839 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0001-9236-6621 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-1136-6900 en_US http://dx.doi.org/10.1007/jhep02(2014)088 Journal of High Energy Physics Creative Commons Attribution http://creativecommons.org/licenses/by/4.0/ application/pdf Springer-Verlag Springer-Verlag |
| spellingShingle | Apyan, Aram Busza, Wit Cali, Ivan Amos Chan, M. Di Matteo, Leonardo Gomez-Ceballos, Guillelmo Goncharov, Maxim Gulhan, Doga Can Klute, Markus Lai, Yue Shi Ma, Teng Paus, Cristoph M. E. Ralph, Duncan Kelley Roland, Cristof E. Stephans, George S. F. Velicanu, Dragos Alexandru Veverka, Jan Wyslouch, Boleslaw Yoon, A. S. Zanetti, Marco Paus, Christoph M. E. Barbieri, Richard Alexander Bauer, Gerry P Dutta, Valentina Lee, Yen-Jie Levin, Andrew Michael Luckey Jr, P David Roland, Gunther M Stoeckli, Fabian Sumorok, Konstanty C Yang, Mingming Wyslouch, Victoria Roland, Christof E Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √s[subscript NN] =2.76 TeV |
| title | Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √s[subscript NN] =2.76 TeV |
| title_full | Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √s[subscript NN] =2.76 TeV |
| title_fullStr | Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √s[subscript NN] =2.76 TeV |
| title_full_unstemmed | Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √s[subscript NN] =2.76 TeV |
| title_short | Studies of azimuthal dihadron correlations in ultra-central PbPb collisions at √s[subscript NN] =2.76 TeV |
| title_sort | studies of azimuthal dihadron correlations in ultra central pbpb collisions at √s subscript nn 2 76 tev |
| url | http://hdl.handle.net/1721.1/87670 https://orcid.org/0000-0002-3831-9071 https://orcid.org/0000-0003-3106-4894 https://orcid.org/0000-0001-6332-5839 https://orcid.org/0000-0001-8983-2169 https://orcid.org/0000-0002-1260-777X https://orcid.org/0000-0002-6047-4211 https://orcid.org/0000-0002-7945-005X https://orcid.org/0000-0003-3681-0649 https://orcid.org/0000-0002-9418-6656 https://orcid.org/0000-0003-1486-606X https://orcid.org/0000-0003-2593-7767 https://orcid.org/0000-0001-9236-6621 https://orcid.org/0000-0002-0869-5631 https://orcid.org/0000-0002-1136-6900 |
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